NEW CENTURY ENERGIES INC
8-K, 1999-03-25
ELECTRIC & OTHER SERVICES COMBINED
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                       SECURITIES AND EXCHANGE COMMISSION

                              WASHINGTON, DC 20549

                                     -------

                                    FORM 8-K

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





Date of Report (Date of earliest event reported)              March 24, 1999
                                                 -------------------------------



                           New Century Energies, Inc.
             (Exact Name of Registrant as Specified in its Charter)


         Delaware                        1-12927               84-1334327
(State or Other Jurisdiction           (Commission           (IRS Employer
      of Incorporation)                File Number)        Identification No.)


                   1225 Seventeenth Street, Denver, Colorado
                                     80202
              (Address of Principal Executive Offices) (Zip Code)


Registrant's telephone number, including area code          (303) 571-7511
                                                  ------------------------------


                                       N/A

          (Former Name or Former Address, if Changed Since Last Report)






<PAGE>


Item 5.  Other Events.

     On March 25,  1999,  New Century  Energies,  Inc.,  a Delaware  corporation
("NCE"),  and Northern States Power Company,  a Minnesota  corporation  ("NSP"),
issued a joint press release  announcing that they had entered into an Agreement
and Plan of  Merger,  dated as of  March  24,  1999  (the  "Merger  Agreement"),
providing for a strategic  business  combination of NCE and NSP. Pursuant to the
Merger Agreement, NCE will be merged with and into NSP with NSP as the surviving
corporation  in the merger  (the  "Merger").  Subject to the terms of the Merger
Agreement,  each  share of NCE common  stock,  par value  $1.00 per share  ("NCE
Common  Stock"),  other than certain  shares to be cancelled,  together with any
associated  purchase  rights,  will be converted  into the right to receive 1.55
(the  "Conversion  Ratio") shares of NSP common stock, par value $2.50 per share
("NSP Common Stock").  Cash will be paid in lieu of any fractional shares of NSP
Common Stock which  holders of NCE Common  Stock would  otherwise  receive.  The
Merger is expected to be a tax free stock-for-stock exchange for shareholders of
both companies and to be accounted for as a pooling of interests.

     The Merger  Agreement and the joint press release  announcing the execution
of  the  Merger   Agreement  are  filed  herewith  as  Exhibits  2.1  and  99.1,
respectively, and are incorporated herein by reference.

     Consummation  of the  Merger is  subject  to  certain  closing  conditions,
including,  among others,  approval by the shareholders of NCE and NSP, approval
or regulatory review by certain state utilities  regulators,  the Securities and
Exchange  Commission  under the Public Utility  Holding  Company Act of 1935, as
amended, the Federal Energy Regulatory  Commission,  the Federal  Communications
Commission,  the Nuclear Regulatory  Commission and expiration or termination of
the  waiting  period  applicable  to  the  Merger  under  the  Hart-Scott-Rodino
Antitrust  Improvements Act of 1976, as amended. Each of NCE and NSP have agreed
to  certain  undertakings  and  limitations   regarding  the  conduct  of  their
businesses  prior to the closing of the  transaction.  The Merger is expected to
take from 12 to 18 months to complete.

     On March  24,  1999,  NCE  amended  (the  "Rights  Amendment")  its  Rights
Agreement  (the "Rights  Agreement")  dated as of August 1, 1997 between NCE and
The Bank of New York as Rights Agent,  to provide that NSP will not be deemed to
be an "Acquiring Person" as defined in the Rights Agreement,  as a result of the
execution,  delivery and performance of the Merger Agreement or the consummation
of the  transactions  contemplated  therein,  with the effect of  exempting  the
transactions contemplated by the Merger Agreement from the Rights Agreement, and
provides that all rights under the Rights Agreement expire at the effective time
of the Merger. The foregoing description of the Rights Agreement is qualified in
its entirety by reference to the terms of the Rights Amendment,  a copy of which
is attached hereto as Exhibit 99.2.


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

The following exhibits are filed herewith:


                                        3

<PAGE>



2.1  Agreement  and Plan of Merger  dated as of March 24,  1999,  by and between
     Northern States Power Company and New Century Energies, Inc.

99.1 Press release dated March 25, 1999.

99.2 Amendment as of March 24, 1999 to the Rights  Agreement  dated as of August
     1, 1997 between New Century Energies, Inc. and The Bank of New York.


                                        4

<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.

                                              NEW CENTURY ENERGIES, INC.


Dated:  March 25, 1999                        By:        /s/ Teresa S. Madden
                                                       -----------------------
                                                       Name:  Teresa S. Madden
                                                       Title:    Controller



                                        5

<PAGE>



                                  EXHIBIT INDEX



EXHIBIT NUMBER                      DESCRIPTION


2.1                 Agreement  and Plan of Merger dated as of March 24, 1999, by
                    and between  Northern  States Power  Company and New Century
                    Energies, Inc.

99.1                Press release dated March 25, 1999.

99.2                Amendment as of March 24, 1999 to the Rights Agreement dated
                    as of August 1, 1997 between New Century Energies,  Inc. and
                    The Bank of New York.



                                        6



                               AGREEMENT AND PLAN
                                    OF MERGER
                                 by and between
                          NORTHERN STATES POWER COMPANY
                                       and
                           NEW CENTURY ENERGIES, INC.
                           Dated as of March 24, 1999



<PAGE>



                                TABLE OF CONTENTS


ARTICLE I

THE MERGER.............................................................1
Section 1.1       The Merger...........................................1
Section 1.2       Effective Time of the Merger.........................2
Section 1.3       Articles of Incorporation; Bylaws....................2

ARTICLE II

TREATMENT OF SHARES....................................................2
Section 2.1       Effect of Merger on Capital Stock....................2
Section 2.2       Exchange of NCE Common Stock.........................3

ARTICLE III

THE CLOSING............................................................5
Section 3.1       Closing..............................................5

ARTICLE IV

REPRESENTATIONS AND WARRANTIES OF NSP..................................5
Section 4.1       Organization and Qualification.......................5
Section 4.2       Subsidiaries.........................................6
Section 4.3       Capitalization.......................................6
Section 4.4       Authority; Non-Contravention; Statutory Approvals;
                  Compliance...........................................7
Section 4.5       Reports and Financial Statements.....................8
Section 4.6       Absence of Certain Changes or Events.................9
Section 4.7       Litigation...........................................9
Section 4.8       Registration Statement and Proxy Statement...........9
Section 4.9       Tax Matters.........................................10
Section 4.10      Employee Matters; ERISA.............................11
Section 4.11      Environmental Protection............................15
Section 4.12      Regulation as a Utility.............................17
Section 4.13      Vote Required.......................................17
Section 4.14      Accounting Matters..................................18
Section 4.15      Opinion of Financial Advisor........................18
Section 4.16      Insurance...........................................18
Section 4.17      Ownership of NCE Common Stock.......................18
Section 4.18      Year 2000...........................................18
Section 4.19      Anti-Takeover Provisions............................18
Section 4.20      Nuclear Operations..................................18

                                       -i-


<PAGE>



Section 4.21      NRC Actions.........................................19

ARTICLE V

REPRESENTATIONS AND WARRANTIES OF NCE.................................19
Section 5.1       Organization and Qualification......................19
Section 5.2       Subsidiaries........................................20
Section 5.3       Capitalization......................................20
Section 5.4       Authority; Non-Contravention; Statutory
                   Approvals; Compliance..............................20
Section 5.5       Reports and Financial Statements....................21
Section 5.6       Absence of Certain Changes or Events................22
Section 5.7       Litigation..........................................22
Section 5.8       Registration Statement and Proxy Statement..........22
Section 5.9       Tax Matters.........................................23
Section 5.10      Employee Matters; ERISA.............................24
Section 5.11      Environmental Protection............................28
Section 5.12      Regulation as a Utility.............................29
Section 5.13      Vote Required.......................................29
Section 5.14      Accounting Matters..................................29
Section 5.15      Opinion of Financial Advisor........................29
Section 5.16      Insurance...........................................29
Section 5.17      Ownership of NSP Common Stock.......................30
Section 5.18      Year 2000...........................................30
Section 5.19      Anti-Takeover Provisions............................30
Section 5.20      NCE Rights Agreement................................30

ARTICLE VI

CONDUCT OF BUSINESS PENDING THE MERGER............................... 30
Section 6.1       Ordinary Course of Business.........................31
Section 6.2       Dividends...........................................31
Section 6.3       Issuance of Securities..............................31
Section 6.4       Charter Documents...................................32
Section 6.5       Acquisitions........................................32
Section 6.6       No Dispositions.....................................33
Section 6.7       Indebtedness........................................33
Section 6.8       Capital Expenditures................................33
Section 6.9       Compensation, Benefits..............................33
Section 6.10      1935 Act............................................34
Section 6.11      Accounting..........................................34
Section 6.12      Pooling.............................................34
Section 6.13      Tax-Free Status.....................................34
Section 6.14      Discharge of Liabilities............................34
Section 6.15      Cooperation, Notification...........................34

                                      -ii-


<PAGE>



 Section 6.16      Rate Matters.......................................35
 Section 6.17      Third-Party Consents...............................35
 Section 6.18      No Breach, Etc.....................................35
 Section 6.19      Tax-Exempt Status..................................35
 Section 6.20      Insurance..........................................35
 Section 6.21      Permits............................................36

ARTICLE VII

ADDITIONAL AGREEMENTS................................................36
Section 7.1       Access to Information..............................36
Section 7.2       Joint Proxy Statement and Registration Statement...36
Section 7.3       Regulatory Matters.................................37
Section 7.4       Shareholder Approvals..............................38
Section 7.5       Directors' and Officers' Indemnification...........39
Section 7.6       Disclosure Schedules...............................40
Section 7.7       Public Announcements...............................40
Section 7.8       Affiliates.........................................41
Section 7.9       Certain Employee Agreements........................41
Section 7.10      Incentive, Stock and Other Plans...................43
Section 7.11      No Solicitations...................................44
Section 7.12      NSP Board of Directors.............................45
Section 7.13      NSP Officers.......................................45
Section 7.14      Corporate Offices..................................45
Section 7.15      Expenses...........................................45
Section 7.16      Name of NSP........................................46
Section 7.17      Transfer of Assets.................................46
Section 7.18      Further Assurances.................................46

ARTICLE VIII

CONDITIONS...........................................................47
Section 8.1       Conditions to Each Party's Obligation to Effect 
                  the Merger.........................................47
Section 8.2       Conditions to Obligation of NCE to Effect
                  the Merger.........................................47
Section 8.3       Conditions to Obligation of NSP to Effect
                  the Merger.........................................48

ARTICLE IX

TERMINATION, AMENDMENT AND WAIVER....................................49
Section 9.1       Termination........................................49
Section 9.2       Effect of Termination..............................52
Section 9.3       Termination Fee; Expenses..........................53
Section 9.4       Amendment..........................................54
Section 9.5       Waiver.............................................54


                                      -iii-


<PAGE>



ARTICLE X

GENERAL PROVISIONS...................................................55
Section 10.1      Non-Survival of Representations, Warranties,
                   Covenants and Agreements..........................55
Section 10.2      Brokers............................................55
Section 10.3      Notices............................................55
Section 10.4      Miscellaneous......................................56
Section 10.5      Interpretation.....................................57
Section 10.6      Counterparts; Effect...............................57
Section 10.7      Parties in Interest................................57
Section 10.8      Specific Performance...............................57
Section 10.9      WAIVER OF JURY TRIAL...............................58


EXHIBITS

Exhibit A         Form of Plan of Merger
Exhibit B         Form of Amendments to NSP Restated Articles of Incorporation
Exhibit C         Form of NCE Affiliate Agreement
Exhibit D         Form of NSP Affiliate Agreement



                                      -iv-


<PAGE>



                          AGREEMENT AND PLAN OF MERGER



     AGREEMENT   AND  PLAN  OF  MERGER,   dated  as  of  March  24,  1999  (this
"Agreement"),  by and between  NORTHERN  STATES  POWER  COMPANY,  a  corporation
organized  under the laws of the State of  Minnesota  ("NSP"),  and NEW  CENTURY
ENERGIES,  INC., a corporation organized under the laws of the State of Delaware
("NCE").

     WHEREAS,  the  respective  Boards of Directors of NSP and NCE have approved
the  merger  of NCE into  NSP on the  terms  and  conditions  set  forth in this
Agreement (such  transaction  being referred to herein as the "Merger") with NSP
being the surviving corporation in the Merger;

     WHEREAS, subject to Section 7.17 hereof, NSP will contribute certain of its
assets to a newly formed wholly-owned subsidiary prior to the Merger.

     WHEREAS,  for accounting  purposes,  it is intended that the Merger will be
accounted  for as a pooling  of  interests  in  accordance  with  United  States
generally  accepted  accounting  principles  ("GAAP") and  applicable  rules and
regulations of the Securities and Exchange Commission ("SEC");

     WHEREAS,  for federal  income tax purposes,  it is intended that the Merger
shall  qualify as a  transaction  described  in Section  368(a) of the  Internal
Revenue Code of 1986, as amended (the "Code"),  and that the shareholders of NCE
will not recognize any gain or loss as a result thereof,  except with respect to
any cash received in lieu of fractional shares; and

     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 I

                                   THE MERGER

     Section 1.1 The Merger.  Pursuant to the plan of merger,  the form of which
is attached  hereto as Exhibit A (the "Plan of Merger"),  and upon the terms and
subject to the conditions of this  Agreement,  at the Effective Time (as defined
in Section 1.2), NCE shall be merged into NSP in accordance with the laws of the
State  of  Minnesota  and the  State of  Delaware.  NSP  shall be the  surviving
corporation in the Merger and shall continue its existence under the laws of the
State of Minnesota  and the separate  existence of NCE shall cease.  The effects
and  consequences  of the Merger shall be as set forth in this Agreement and the
Plan of Merger, in

                                       -1-


<PAGE>



Section  302A.641 of the  Minnesota  Business  Corporation  Act (the "MBCA") and
Section 259(a) of the Delaware General Corporation Law (the "DGCL").

     Section 1.2 Effective  Time of the Merger.  On the Closing Date (as defined
in  Section  3.1),  articles  of merger  with  respect  to the  Merger,  in form
acceptable to NSP and NCE ("Articles of Merger"), shall be executed and filed by
the  parties  hereto  with the  Secretary  of State  of the  State of  Minnesota
pursuant to Section  302A.615 of the MBCA and a certificate  of merger,  in form
acceptable to NSP and NCE (the  "Certificate of Merger"),  shall be executed and
filed by the parties hereto with the Secretary of State of the State of Delaware
pursuant to Section 252 of the DGCL. The Merger shall become  effective upon the
later of the filing of such Articles of Merger and Certificate of Merger,  or at
such later time that NSP and NCE shall  agree as  specified  in the  Articles of
Merger and  Certificate of Merger (the time the Merger becomes  effective  being
hereinafter called the "Effective Time").

     Section 1.3 Articles of Incorporation;  Bylaws.  Unless otherwise agreed by
NCE and NSP prior to the Closing Date:

     (a) At and after the Effective  Time (until  amended as provided by law and
such Restated Articles of Incorporation), the Restated Articles of Incorporation
of NSP shall be amended as provided in Exhibit B hereto.

     (b) At and after the Effective  Time (until amended as provided by law, the
Restated  Articles of Incorporation of NSP and such Bylaws of NSP) the Bylaws of
NSP will continue unchanged.


                                   ARTICLE II

                               TREATMENT OF SHARES

     Section 2.1 Effect of Merger on Capital  Stock.  At the Effective  Time, by
virtue of the  Merger  and  without  any action on the part of any holder of any
capital stock of NSP or NCE:

     (a)  Cancellation  of Certain  NCE Common  Stock.  Each share of NCE common
stock,  par value $1.00 per share ("NCE Common  Stock"),  together  with any NCE
Rights  (as  defined  in  Section  5.20),  that  is  owned  by NSP or any of its
subsidiaries (as defined in Section 4.1) or held in the treasury of NCE shall be
cancelled and shall cease to exist, and no  consideration  shall be delivered in
exchange therefor.

     (b) Conversion of Certain NCE Common Stock.  Each share of NCE Common Stock
issued and  outstanding  immediately  prior to the  Effective  Time  (other than
shares  cancelled  pursuant to Section  2.1(a)),  together  with any NCE Rights,
shall be  converted  into the right to  receive  1.55  shares  (the  "Conversion
Ratio") of duly authorized, validly issued, fully paid and

                                       -2-


<PAGE>



nonassessable  NSP common stock, par value $2.50 per share ("NSP Common Stock").
Upon such  conversion,  each holder of any shares of NCE Common  Stock  (whether
held in book entry or  certificated  form)  shall  cease to have any rights with
respect  thereto,  except the right to receive the shares of NSP Common Stock to
be issued in  consideration  therefor  (and  cash in lieu of  fractional  shares
pursuant to Section 2.2(d)) upon the surrender of such  certificate or otherwise
upon compliance with Section 2.2.

     (c) NSP Common Stock to Remain Outstanding.  Each share of NSP Common Stock
and each share of  preferred  stock of NSP issued  and  outstanding  immediately
prior to the  Effective  Time shall remain  outstanding  following the Effective
Time.

     Section 2.2 Exchange of NCE Common Stock.

     (a) Deposit with Exchange Agent. As soon as practicable after the Effective
Time,  NSP shall deposit with a bank,  trust company or other agent  selected by
mutual agreement of the parties  ("Exchange  Agent")  certificates  representing
whole  shares of NSP Common Stock to be issued in the Merger as provided in this
Article II.

     (b) Exchange  Procedures.  As soon as practicable after the Effective Time,
the  Exchange  Agent  shall mail to each  holder of record of a  certificate  or
certificates  ("Certificate")  which  immediately  prior to the  Effective  Time
represented  issued and  outstanding  shares of NCE Common Stock ("NCE Shares"),
(i) a  letter  of  transmittal  (which  shall  specify  that  delivery  shall be
effected,  and risk of loss and title to the Certificates  shall pass, only upon
actual delivery of the Certificates to the Exchange Agent) and (ii) instructions
for use in effecting the exchange of Certificates for certificates  representing
shares of NSP Common  Stock ("NSP  Shares")  or for  effecting  the  exchange of
Certificates  for  NSP  Shares  to be  held  in  book  entry  form.  As  soon as
practicable after the Effective Time, the Exchange Agent shall also mail to each
holder of record of NCE Shares  held in book entry form  ("Book  Entry  Shares")
instructions for use in effecting the exchange of said Book Entry Shares for NSP
Shares.  Upon  delivery of a  Certificate  to the Exchange  Agent for  exchange,
together with a duly executed  letter of transmittal and such other documents as
the  Exchange  Agent  shall  require,  or,  in the  case of Book  Entry  Shares,
compliance with the  instructions for the exchange  thereof,  the holder of such
Certificate  or Book Entry  Shares  shall be  entitled  to  receive in  exchange
therefor  that  number of whole  NSP  Shares  and the  amount of cash in lieu of
fractional  share  interests  (pursuant to Section  2.2(d)),  if any, which such
holder has the right to receive  pursuant to the  provisions of this Article II.
In the event of a transfer of ownership of NCE Shares which is not registered in
the transfer records of NCE, the proper number of NSP Shares will be issued to a
transferee if, in addition to the other requirements for exchange,  the Exchange
Agent  receives all documents  required to evidence and effect such transfer and
evidence  satisfactory to the Exchange Agent that any applicable  stock transfer
taxes have been paid.  Until delivered as contemplated by this Section 2.2, each
Certificate,  and until  exchanged as contemplated by this Section 2.2, all Book
Entry Shares,  shall be deemed at any time after the Effective Time to represent
only the right to receive  whole NSP  Shares and cash in lieu of any  fractional
shares of NSP Common Stock as contemplated by this Section 2.2.


                                       -3-


<PAGE>



     (c) Distributions with Respect to Unexchanged Shares. No dividends or other
distributions  declared  or made after the  Effective  Time with  respect to NSP
Shares with a record date after the  Effective  Time shall be paid to the holder
of any undelivered  Certificate or unexchanged Book Entry Shares with respect to
the NSP Shares  represented  thereby,  and no cash payment in lieu of fractional
shares shall be paid to any such holder  pursuant to Section  2.2(d),  until the
holder of record of such  Certificate  or  unexchanged  Book Entry  Shares (or a
transferee as described in Section 2.2(b)) shall have delivered such Certificate
or effected the exchange of such Book Entry  Shares as  contemplated  in Section
2.2(b).  Subject  to  the  effect  of  unclaimed  property,  escheat  and  other
applicable laws,  following  delivery of any such Certificate or exchange of any
such Book Entry Shares, there shall be paid to the record holder (or transferee)
of the whole NSP Shares issued in exchange  therefor,  without interest,  (i) at
the  time  of  such  delivery,  the  amount  of any  cash  payable  in lieu of a
fractional  share of NSP Common  Stock to which such holder (or  transferee)  is
entitled  pursuant  to  Section  2.2(d)  and the  amount of  dividends  or other
distributions  with a record date after the Effective Time theretofore paid with
respect to such whole NSP Shares 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 delivery or exchange and a payment date  subsequent
to delivery or exchange  payable with  respect to such whole NSP Shares,  as the
case may be.

     (d)  No  Fractional  Shares.  (i) No  certificates  or  scrip  representing
fractional  shares of NSP Common  Stock  shall be issued  upon the  delivery  of
Certificates  or  exchange  of Book  Entry  Shares,  and such  fractional  share
interests  will not  entitle  the owner  thereof  to vote or to any  rights of a
shareholder  of NSP.  All  holders of NCE Common  Stock who would  otherwise  be
entitled to receive a  fractional  share of NSP Common Stock shall  receive,  in
lieu  thereof  upon  delivery or  exchange of its NCE Shares,  an amount of cash
determined by  multiplying  the fraction of a share of NSP Common Stock to which
such  shareholder  would otherwise be entitled by the closing sales price of NSP
Common Stock as reported under "NYSE Composite Transition Reports",  in The Wall
Street Journal on the trading day immediately  prior to the Effective Time. From
time to time,  NSP  shall,  subject  to Section  2.2(f)  hereof,  deliver to the
Exchange  Agent cash in such amounts as shall be necessary to pay to the holders
of NCE Shares cash in lieu of fractional shares of NSP Common Stock.

     (e) Closing of Transfer Books. From and after the Effective Time, the stock
transfer  books of NCE with  respect  to shares of NCE Common  Stock  issued and
outstanding  prior to the Effective  Time shall be closed and no transfer of any
such shares shall thereafter be made. If, after the Effective Time, Certificates
are presented to NSP,  they shall be cancelled  and  exchanged for  certificates
representing  the  appropriate  number of whole NSP  Shares  and cash in lieu of
fractional shares of NSP Common Stock as provided in this Section 2.2.

     (f) Termination of Exchange Agent. Any certificates representing NSP Shares
deposited  with the Exchange  Agent pursuant to Section 2.2(a) and not exchanged
within six (6) months  after the  Effective  Time  pursuant to this  Section 2.2
shall be returned by the Exchange  Agent to NSP,  which shall  thereafter act as
Exchange Agent.  All funds held by the Exchange Agent for payment to the holders
of undelivered Certificates or unexchanged Book Entry Shares

                                       -4-


<PAGE>



and  unclaimed  at the end of six (6) months  from the  Effective  Time shall be
remitted to NSP,  after  which time any holder of  undelivered  Certificates  or
unexchanged  Book Entry Shares shall look as a general  creditor only to NSP for
payment  of such funds to which such  holder may be due,  subject to  applicable
law. NSP shall not be liable to any person for such shares or funds delivered to
a public  official  pursuant to any applicable  abandoned  property,  escheat or
similar law.

     (g) Adjustment of Conversion  Ratio.  In the event that,  subsequent to the
date  hereof but prior to the  Effective  Time,  the  outstanding  shares of NCE
Common Stock or NSP Common Stock,  respectively,  shall have been changed into a
different  number of shares or a different  class as a result of a stock  split,
reverse stock split, stock dividend, subdivision, reclassification, combination,
exchange,  recapitalization or other similar  transaction,  the Conversion Ratio
shall be  appropriately  adjusted  to provide the holders of NCE Shares the same
economic effect as contemplated by this Agreement prior to such event.

                                   ARTICLE III

                                   THE CLOSING

     Section 3.1 Closing.  The closing (the  "Closing") of the Merger shall take
place at a place as may be mutually  agreed upon by the parties  hereto at 10:00
A.M.,  local time, on the second business day immediately  following the date on
which the last of the  conditions  set forth in  Article  VIII is  fulfilled  or
waived,  or at such other time and date as NCE and NSP shall mutually agree (the
"Closing Date").


                                   ARTICLE IV

                      REPRESENTATIONS AND WARRANTIES OF NSP

     Except as set forth in the  corresponding  sections or  subsections  of the
Disclosure Schedule,  dated as of the date hereof,  delivered by NSP to NCE (the
"NSP Disclosure Schedule"), NSP represents and warrants to NCE as follows:

     Section  4.1   Organization  and   Qualification.   NSP  and  each  of  its
subsidiaries  is a  corporation  or other legal entity duly  organized,  validly
existing and in good standing under the laws of its  jurisdiction  of existence,
has all requisite  power and authority 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  would not, when taken
together with all other such  failures,  have a material  adverse  effect on the
business,  operations,  properties,  assets, condition (financial or otherwise),
prospects or results of operations of NSP and its subsidiaries  taken as a whole
(any such  material  adverse  effect  being  hereinafter  referred  to as a "NSP
Material Adverse Effect"). True, accurate and complete copies

                                       -5-


<PAGE>



of the  articles  of  incorporation  and bylaws of NSP, as in effect on the date
hereof,  have  been  delivered  to NCE.  As used in  this  Agreement,  the  term
"subsidiary"  with  respect to any person  shall mean any  corporation  or other
entity  (including  partnerships and other business  associations) in which such
person  directly or indirectly  owns  outstanding  capital stock or other voting
securities having the power, under ordinary  circumstances,  to elect a majority
of the directors or similar members of the governing body of such corporation or
other  entity or  otherwise  to  direct  the  management  and  policies  of such
corporation or other entity.

     Section  4.2  Subsidiaries.  Section  4.2 of the  NSP  Disclosure  Schedule
contains  a  description  as of the date  hereof of all  subsidiaries  and joint
ventures  of  NSP,  including  the  name of  each  such  entity,  the  state  or
jurisdiction of its incorporation,  a brief description of the principal line or
lines  of  business  conducted  by  each  such  entity  that  is a  "Significant
Subsidiary"  within the meaning of Regulation S-X under the Securities  Exchange
Act of 1934, as amended (the "Exchange Act") and NSP's interest therein. 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
the Public Utility Holding Company Act of 1935, as amended ("1935 Act"). All the
issued and outstanding shares of capital stock of, or other equity interests in,
each NSP subsidiary  have been duly  authorized and validly issued and are fully
paid and  nonassessable  (subject  to Section  180.0622(2)(b)  of the  Wisconsin
Business  Corporation Law, as judicially  interpreted,  in the case of NSP-W (as
defined in Section  4.12)) and are owned  directly or indirectly by NSP free and
clear  of all  pledges,  claims,  liens,  charges,  encumbrances,  and  security
interests of any kind or nature whatsoever  (collectively "Liens"). 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.  As used in this  Agreement,  the  term  "joint
venture" with respect to any 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 that
are less than 5% of any class of the  outstanding  voting  securities or equity,
provided that such person or one or more of its  subsidiaries  does not have the
power,  under  ordinary  circumstances,  to elect a majority of the directors or
similar members of the governing body of such corporation or entity or otherwise
to direct the management and policies of such corporation or entity.

     Section 4.3 Capitalization. The authorized capital stock of NSP consists of
350,000,000  shares of NSP Common Stock and 7,000,000 shares of preferred stock,
par value $100 per share ("NSP Preferred Stock"). As of the close of business on
March 24,  1999,  there were issued and  outstanding  153,194,008  shares of NSP
Common Stock and 1,050,000 shares of NSP Preferred Stock, consisting of: 275,000
shares of $3.60 Series;  150,000 shares of $4.08 Series;  175,000 share of $4.10
Series;  200,000  shares of $4.11 Series;  100,000  shares of $4.16 Series;  and
150,000 shares of $4.56 Series.  All of the issued and outstanding shares of the
capital

                                       -6-


<PAGE>



stock  of NSP  are  validly  issued,  fully  paid,  nonassessable  and  free  of
preemptive   rights.   As  of  the  date  hereof,   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  NSP or any of its  subsidiaries  or
joint  ventures to issue,  deliver or sell, or cause to be issued,  delivered or
sold,  additional  shares of the capital stock or other voting securities of NSP
or obligating NSP or any of its subsidiaries or joint ventures to grant,  extend
or enter into any such agreement or commitment.

     Section 4.4 Authority; Non-Contravention; Statutory Approvals; Compliance.

     (a) Authority. NSP has all requisite power and authority to enter into this
Agreement and the Plan of Merger and, subject to the NSP Shareholders'  Approval
(as  defined in  Section  4.13) and the NSP  Required  Statutory  Approvals  (as
defined in Section 4.4(c)),  to consummate the transactions  contemplated hereby
and thereby. The Board of Directors of NSP has (i) determined that the Merger is
fair to and in the best interest of NSP and its shareholders,  (ii) approved and
adopted this  Agreement and the Plan of Merger,  and (iii) resolved to recommend
to the  holders of NSP Common  Stock  that they vote in favor of  approving  the
Merger and  approving  and adopting  this  Agreement and the Plan of Merger (the
"NSP Shareholders' Approval").  The execution and delivery of this Agreement and
the Plan of Merger and the consummation by NSP of the transactions  contemplated
hereby and thereby have been duly authorized by all necessary  corporate  action
on the part of NSP, subject to obtaining the NSP  Shareholders'  Approval.  This
Agreement has been and the Plan of Merger will be duly and validly  executed and
delivered by NSP and,  assuming the due  authorization,  execution  and delivery
hereof and thereof by NCE, this  Agreement  constitutes,  and the Plan of Merger
will  constitute,  the legal,  valid and binding  obligation of NSP  enforceable
against  NSP in  accordance  with the terms  hereof  and  thereof.  Prior to the
Effective  Time, the Board of Directors of NSP, or an  appropriate  committee of
non-employee  directors thereof,  will have adopted a resolution consistent with
the  interpretive  guidance of the SEC so that the acquisition by any officer or
director of NCE who may become a covered  person of NSP for  purposes of Section
16 of the Exchange Act and the rules and regulations  thereunder  ("Section 16")
of shares of NSP Common Stock or options to acquire NSP Common Stock pursuant to
this  Agreement  and the Merger shall be an exempt  transaction  for purposes of
Section 16.

     (b) Non-Contravention.  The execution and delivery of this Agreement by NSP
do not,  and the  execution  and delivery by NSP of the Plan of Merger will not,
and the  consummation  of the  transactions  contemplated  hereby  and  thereby,
including the contribution of assets  contemplated by Section 7.17 hereof,  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  of, or accelerate  the  performance  required by, or
result in a right of  termination,  cancellation or acceleration of any material
obligation  under or the loss of a  material  benefit  under,  or  result in the
creation of any Lien upon any of the  properties or assets (any such  violation,
conflict,  breach, default, right of termination,  cancellation or acceleration,
loss or creation being  hereinafter  referred to as a "Violation") by NSP or any
of its subsidiaries or any

                                       -7-


<PAGE>



of its joint  ventures,  under any  provisions  of (i) subject to obtaining  the
approval  of the  SEC  under  the  provisions  of  the  1935  Act  and  the  NSP
Shareholders'  Approval,  the  articles  of  incorporation,  bylaws  or  similar
governing  documents of NSP or any of its  subsidiaries or joint ventures,  (ii)
subject to obtaining the NSP Required Statutory Approvals and the receipt of the
NSP Shareholders'  Approval,  any statute,  law,  ordinance,  rule,  regulation,
judgment,  decree,  order,  injunction,  writ,  permit or  license of any court,
governmental   or  regulatory   body   (including  a  stock  exchange  or  other
self-regulatory  body) or authority,  domestic or foreign (each, a "Governmental
Authority"),  applicable  to NSP or any of its  material  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 NSP Disclosure Schedule (the "NSP 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 NSP or any of its subsidiaries or joint ventures is now a party or
by which any of them or any of their  respective  properties  or  assets  may be
bound or  affected,  excluding  from the  foregoing  clauses (ii) and (iii) such
Violations as would not have, in the aggregate, a NSP Material Adverse Effect.

     (c) Statutory  Approvals.  No declaration,  filing or registration with, or
notice to or authorization, consent, finding by or approval of, any Governmental
Authority is necessary for the  execution and delivery of this  Agreement or the
Plan  of  Merger  by  NSP  or  the  consummation  by  NSP  of  the  transactions
contemplated  hereby or thereby,  which, if not obtained,  made or given,  would
have,  in the  aggregate,  a NSP  Material  Adverse  Effect  (the "NSP  Required
Statutory Approvals"),  it being understood that references in this Agreement to
"obtaining"  such NSP  Required  Statutory  Approvals  shall  mean  making  such
declarations,  filings or  registrations;  giving such  notice;  obtaining  such
consents or approvals;  and having such waiting  periods expire as are necessary
to avoid a violation of law.

     (d) Compliance. Except as specifically disclosed in the NSP SEC Reports (as
defined in Section 4.5) filed prior to the date  hereof,  neither NSP nor any of
its  subsidiaries  or joint  ventures is in violation of or 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,  any Environmental  Laws (as defined in Section 4.11(g)) of
any  Governmental  Authority,  except for  violations  that  would  not,  in the
aggregate,  have and are not  reasonably  likely to have a NSP Material  Adverse
Effect. NSP and its subsidiaries and joint ventures have all permits,  licenses,
franchises  and  other  governmental  authorizations,   consents  and  approvals
necessary  to  conduct  their  respective   businesses  as  currently  conducted
(collectively,  "Permits"),  except  those  Permits the failure to obtain  which
would not have, in the aggregate, a NSP Material Adverse Effect.

     Section 4.5 Reports and Financial  Statements.  The filings  required to be
made by NSP and its subsidiaries  since January 1, 1996 under the Securities Act
of 1933, as amended (the "Securities  Act"), the Exchange Act, the Federal Power
Act, as amended,  ("Power Act"), the Atomic Energy Act of 1954, as amended, (the
"Atomic Energy Act"), the 1935 Act, the Natural Gas Act, if any, the Natural Gas
Policy Act of 1978 (the "Gas Policy Act"), if any, and applicable state laws and
regulations have been filed with the SEC, Federal Energy Regulatory

                                       -8-


<PAGE>



Commission (the "FERC"),  the Nuclear  Regulatory  Commission (the "NRC") or the
applicable state authorities with  jurisdiction  over public  utilities,  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.  NSP has made
available to NCE a true and complete copy of each report, schedule, registration
statement and definitive proxy statement filed by NSP with the SEC since January
1, 1996 and through the date  hereof (as such  documents  have since the time of
their  filing  been  amended,  the  "NSP  SEC  Reports").  The NSP SEC  Reports,
including  without  limitation  any financial  statements or schedules  included
therein,  at the time filed, and any forms,  reports or other documents filed by
NSP with the SEC after the date hereof, did not and will not, in each case as of
their respective dates,  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  NSP  included  in  the  NSP  SEC  Reports
(collectively,  the "NSP Financial  Statements") have been prepared, and will be
prepared,  in accordance with GAAP applied on a consistent  basis throughout the
periods involved (except as may be indicated therein or in the notes thereto, or
with  respect  to  unaudited  statements,  as  permitted  by Form 10-Q under the
Exchange  Act) and fairly  present in all material  respects,  the  consolidated
financial position of NSP as of the respective dates thereof or the consolidated
results of operations and cash flows for the respective  periods then ended,  as
the  case  may be,  subject,  in the  case of the  unaudited  interim  financial
statements, to normal, recurring audit adjustments.

     Section 4.6 Absence of Certain  Changes or Events.  Except as  specifically
disclosed in the NSP SEC Reports  filed prior to the date hereof,  from December
31, 1998 through the date  hereof,  NSP and each of its  subsidiaries  and joint
ventures have conducted their respective  businesses only in the ordinary course
of business  consistent  with past practice and no event has occurred  which has
had, and no fact or condition exists that would have or is reasonably  likely to
have a NSP Material Adverse Effect.

     Section 4.7  Litigation.  Except as  specifically  disclosed in the NSP SEC
Reports filed prior to the date hereof, (a) there are no claims,  suits, actions
or proceedings  pending or, to the knowledge of NSP,  threatened,  nor are there
any  investigations  or reviews pending or, to the knowledge of NSP,  threatened
against or affecting NSP or any of its subsidiaries or joint ventures, (b) there
have not been any developments  since December 31, 1998 with respect to any such
disclosed claims,  suits, actions,  proceedings,  investigations or reviews, and
(c) there are no judgments, decrees, injunctions,  rules or orders of any court,
governmental department, commission, agency, instrumentality or authority or any
arbitrator  applicable to NSP or any of its subsidiaries or joint ventures that,
in the  aggregate,  would have or are  reasonably  likely to have a NSP 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 NSP for  inclusion or
incorporation by reference in (a) the  registration  statement on Form S-4 to be
filed with the SEC by NSP in

                                       -9-


<PAGE>



connection  with the  issuance of shares of NSP Common  Stock in the Merger (the
"Registration  Statement") will, at the time the Registration  Statement becomes
effective  under the  Securities  Act,  and as the same may be  amended,  at the
effective  time of such  amendment,  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 (b) the joint proxy
statement in definitive  form,  relating to the meetings of the  shareholders of
NCE and NSP to be held in connection with the Merger and the prospectus relating
to  NSP  Common   Stock  to  be  issued  in  the  Merger   (the   "Joint   Proxy
Statement/Prospectus")  will, at the date such Joint Proxy  Statement/Prospectus
is mailed to such shareholders, and, as the same may be amended or supplemented,
at the times of such meetings,  contain any untrue  statement of a material fact
or omit to state any material  fact  necessary  in order to make the  statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.  The Registration Statement and the Joint Proxy Statement/Prospectus
will  comply as to form in all  material  respects  with the  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, 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 receipts,
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 written  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 of entities  that includes NSP or any of its
subsidiaries  on the one hand,  or NCE or any of its  subsidiaries  on the other
hand.  Except in the case of the  representations  or  warranties  contained  in
subsections  (a), (b),  (c), (d), (e), (f), (g), (h), (i), or (j) hereof,  where
the failure  thereof to be true and correct would not, in the aggregate,  have a
NSP Material Adverse Effect:

     (a) All Tax Returns in respect of Taxes  required to be filed with  respect
to NSP and each of its subsidiaries  (including the consolidated  federal income
Tax  Return of NSP and any  state Tax  Return  that  includes  NSP or any of its
subsidiaries on a consolidated or combined basis) have been timely filed.

     (b) All Taxes  required  to be shown on such Tax Returns or  otherwise  due
have been timely paid.

     (c) All such Tax Returns are true, correct and complete in all respects.

     (d) No  adjustment  relating to such Tax  Returns (or that could  result in
liability of NSP or any of its subsidiaries on the basis of joint and/or several
liability) has been proposed in writing by any Tax authority.

                                      -10-


<PAGE>




     (e) There are no pending or  threatened in writing  actions or  proceedings
for the assessment or collection of Taxes against NSP or any of its subsidiaries
(or that could  result in a liability of NSP or any of its  subsidiaries  on the
basis of joint and/or  several  liability) or against any  corporation  that was
included in the filing of a return with NSP on a consolidated or combined basis.

     (f) There are no Tax liens on any assets of NSP or any of its subsidiaries.

     (g) NSP and each of its  subsidiaries has been and continues to be a member
of the affiliated  group (within the meaning of Section  1504(a)(1) of the Code)
for which NSP files a consolidated return as the common parent.

     (h) There are no outstanding waivers or agreements extending the statute of
limitations  for any period  with  respect to any Tax to which NSP or any of its
subsidiaries may be subject.

     (i) Neither NSP nor any of its subsidiaries  has any (i) income  reportable
for a period  ending after the Closing Date but  attributable  to a  transaction
(e.g., an installment  sale) occurring in or a change in accounting  method made
from a period  ending  on or prior  to the  Closing  Date  which  resulted  in a
deferred  reporting  of income  from  such  transaction  or from such  change in
accounting  method  (other than a deferred  intercompany  transaction),  or (ii)
deferred gain or loss arising out of any deferred intercompany transaction.

     (j) No power of attorney  that is  currently in force has been granted with
respect to any  matter  relating  to Taxes  that could  affect NSP or any of its
subsidiaries.

     (k) NSP has no  knowledge  of any fact,  nor has NSP taken any action  that
would, or would be reasonably  likely to, adversely affect the  qualification of
the Merger as a reorganization described in Section 368(a) of the Code.

     Section 4.10 Employee Matters; ERISA.

     (a) Each  "employee  benefit  plan"  (as  defined  in  Section  3(3) of the
Employee  Retirement  Income Security Act of 1974, as amended  ("ERISA")),  each
other bonus, deferred compensation,  stock option, severance,  change in control
or other written plan or policy  relating to  compensation,  fringe  benefits or
perquisites  for current or former  directors  or employees of NSP or any of its
subsidiaries  that  is  maintained  or  contributed  to by  NSP  or  any  of its
subsidiaries, each employment, severance, change-in-control or similar agreement
that exists between NSP or any of its subsidiaries and any officer of NSP or any
of its  subsidiaries  that provides for base pay in excess of $150,000 per year,
and each other employment,  severance,  change in control or similar arrangement
that exists  between NSP or any of its  subsidiaries  and any employee of NSP or
any of its  subsidiaries  that  provides  severance,  change in control or other
similar  payments or benefits  which  exceed three times the  employee's  annual
compensation

                                      -11-


<PAGE>



(collectively,  the "NSP Employee  Benefit  Plans"),  and each current or former
employee or director  eligible to participate  in the NSP 1999 Senior  Executive
Severance  Policy is listed in Section  4.10(a) of the NSP Disclosure  Schedule.
Except where the failure to be in material compliance or to be so operated would
not, in the aggregate,  have a NSP Material  Adverse  Effect,  each NSP Employee
Benefit  Plan  and  each  employee   benefit  plan  and  each  bonus,   deferred
compensation,  stock option, severance, change in control or other written plan,
agreement or policy relating to compensation, fringe benefits or perquisites for
current  or  former  directors  or  employees  of any of  NSP's  joint  ventures
(collectively, the "NSP Joint Venture Plans"), is in substantial compliance with
applicable law, including,  without limitation, ERISA and the Code, and has been
administered and operated in all material respects in accordance with its terms.
Each NSP Employee Benefit Plan and each NSP Joint Venture Plan which is intended
to be qualified  within the meaning of Section 401(a) of the Code has received a
favorable  determination  letter from the IRS and, to the  knowledge  of NSP, no
event has occurred and no condition exists which could reasonably be expected to
result in the revocation of any such determination.

     (b) NSP has provided  complete and correct  copies of all plan documents of
the NSP Employee  Benefit Plans listed in Section  4.10(a) of the NSP Disclosure
Schedule,  including  but not  limited to, plan  amendments,  trust  agreements,
insurance  contracts  or  other  documents  establishing  funding  arrangements,
service  provider  contracts,  investment  management  and  investment  advisory
agreements,   all  advance   determination   letters   from  the  IRS,   summary
modifications  thereto,  the last five  years'  Form  5500s and the most  recent
actuarial and financial statements.

     (c) No NSP Employee Benefit Plan is or ever has been subject to Title IV of
ERISA or the funding  requirements of Section 412 of the Code.  Neither NSP, its
subsidiaries,  nor any other entity under common  control with NSP or any of its
subsidiaries  (as  determined  under  Code  Sections  414(b)  and (c)) (the "NSP
Control  Group") has any liability under Title IV of ERISA or Section 412 of the
Code with respect to any employee benefit plan other than a NSP Employee Benefit
Plan,  which  liability has not been satisfied in full. No NSP Employee  Benefit
Plan or NSP Joint Venture Plan subject to Title IV of ERISA has been  terminated
or is, to the knowledge of NSP, currently the subject of termination proceedings
pursuant to Title IV of ERISA.

     (d) No event which constitutes a "reportable  event" (as defined in Section
4043(b) of ERISA) for which the 30-day notice requirement has not been waived by
the Pension Benefit Guarantee Corporation (the "PBGC") has occurred with respect
to any  NSP  Employee  Benefit  Plan  or NSP  Joint  Venture  Plan,  except  for
reportable events which would not, individually or in the aggregate,  have a NSP
Material Adverse Effect.

     (e) Except where the failure to pay any such  amounts  would not have a NSP
Material Adverse Effect,  full payment has been made of all amounts which NSP or
any of its  subsidiaries  or joint  ventures was required under the terms of NSP
Employee Benefit Plans and NSP Joint Venture Plans to have paid as contributions
to such plans on or prior to the  Closing  Date  (excluding  any amounts not yet
due) and no NSP Employee Benefit Plan or NSP Joint

                                      -12-


<PAGE>



Venture  Plan which is subject to Part III of Subtitle B of Title I of ERISA has
incurred any "accumulated  funding deficiency" within the meaning of Section 302
of ERISA or Section 412 of the Code), whether or not waived.

     (f) No liability,  claim,  action or litigation  has been  incurred,  made,
commenced  or, to the  knowledge of NSP,  threatened by or against NSP or any of
its  subsidiaries  or joint  ventures  with respect to any NSP Employee  Benefit
Plans or NSP  Joint  Venture  Plans  including,  without  limitation,  liability
incurred  under  Title  IV of ERISA  (other  than for  benefits  payable  in the
ordinary  course and PBGC  insurance  premiums) or Section  412(f) or (n) of the
Code by any entity required to be aggregated with NSP or any of its subsidiaries
or joint ventures  pursuant to Section 4001(b) of ERISA and/or Section 414(b) or
(c) of the Code (and the regulations promulgated thereunder) with respect to any
"employee  pension  benefit plan" (as defined in Section 3(2) of ERISA),  except
for the liabilities, claims, actions or litigation which, individually or in the
aggregate, would not have a NSP Material Adverse Effect.

     (g) Neither NSP nor any of its  subsidiaries  or joint ventures nor, to the
knowledge of NSP,  any other  "disqualified  person" or "party in interest"  (as
defined  in  Section  4975(e)(2)  of the Code and  Section  3(14) of ERISA)  has
engaged in any transaction in connection  with any NSP Employee  Benefit Plan or
NSP Joint  Venture  Plan that  could  reasonably  be  expected  to result in the
imposition of a material penalty  pursuant to Section 502(i) of ERISA,  material
damages  pursuant to Section 409 of ERISA or a material  tax pursuant to Section
4975(a) of the Code.  No NSP Employee  Benefit Plan or NSP Joint Venture Plan or
related trust owns any  securities in violation of Section 407 of ERISA,  except
as would not have a NSP Material Adverse Effect.

     (h) With  respect  to each NSP  Employee  Benefit  Plan and each NSP  Joint
Venture  Plan  which is  subject  to Title IV of  ERISA,  as of the most  recent
actuarial   valuation  report  prepared  for  each  such  plan  and  based  upon
assumptions  set forth  therein,  the  aggregate  present  value of the  accrued
liabilities thereof did not exceed the aggregate fair market value of the assets
allocable thereto.

     (i) Each NSP Employee Benefit Plan and each NSP Joint Venture Plan which is
a  "multiemployer   plan"  (as  defined  in  Section  4001(a)(3)  of  ERISA)  (a
"Multiemployer  Plan") or a plan that has two or more  contributing  sponsors at
least two of whom are not under  common  control,  within the meaning of Section
4063  of  ERISA  (a  "Multiple  Employer  Plan")  to  which  NSP  or  any of its
subsidiaries  or joint ventures is obligated to contribute is identified as such
in Section 4.10(i) of the NSP Disclosure Schedule. All contributions required to
have  been  made by NSP or any of its  subsidiaries  or  joint  ventures  to any
Multiemployer  Plan  have  been  made on a timely  basis.  No  member of the NSP
Controlled  Group  has  incurred  any  withdrawal  liability  that  has not been
satisfied  in full or at any time during the last six years has  withdrawn  from
any  Multiemployer  Plan or Multiple  Employer  Plan.  With  respect to each NSP
Employee  Benefit Plan and each NSP Joint  Venture Plan that is a  Multiemployer
Plan:  (i) if NSP or any of its  subsidiaries  or joint ventures or any of their
respective ERISA Affiliates,  as applicable,  were to experience a withdrawal or
partial withdrawal from such plan, no withdrawal liability would be

                                      -13-


<PAGE>



incurred  except  as would  not have a NSP  Material  Adverse  Effect;  and (ii)
neither NSP nor any of its  subsidiaries  or joint  ventures  has  received  any
notification,  or  has  any  reason  to  believe,  that  any  such  plan  is  in
reorganization, has been terminated, is insolvent, or may reasonably be expected
to be in reorganization, to be insolvent, or to be terminated.

     (j) Neither NSP nor any of its  subsidiaries has maintained any plan (other
than a plan which is  intended to be  "qualified"  within the meaning of Section
401(a) of the Code) which provides  welfare  benefits with respect to current or
former  employees,  current or former officers,  or current or former directors,
following  their  termination  of  service  with NSP or any of its  subsidiaries
(other than as required by Section 601 of ERISA or other  applicable  law). Each
NSP Employee  Benefit Plan or NSP Joint Venture Plan subject to the requirements
of Section 601 of ERISA has been operated in substantial  compliance  therewith,
except as would not have a NSP Material  Adverse Effect.  Neither NSP nor any of
its  subsidiaries  or joint ventures has  contributed to a  nonconforming  group
health  plan (as  defined  in Code  Section  5000(c))  and no  member of the NSP
Control Group has incurred a tax under Code Section  5000(a) that is or could be
a liability  of NSP or any of its  subsidiaries,  except as would not have a NSP
Material Adverse Effect.

     (k) No individual shall accrue or receive additional  benefits,  service or
accelerated  vesting or rights to payment as a direct result of the transactions
contemplated  by this Agreement and no payment or benefit  accrued under any NSP
Employee  Benefit  Plan  or  NSP  Joint  Venture  Plan  or  other  agreement  or
arrangement  of NSP  or  any of its  subsidiaries  or  joint  ventures  will  be
nondeductible under Code Sections 162(m) or 280G.

     (l) To the  knowledge  of NSP, as of the date  hereof,  there is no current
labor union  representation  question  involving  employees of NSP or any of its
subsidiaries or joint ventures, nor does NSP or any of its subsidiaries or joint
ventures  know of any  activity  or  proceeding  of any labor  organization  (or
representative  thereof)  or  employee  group  (or  representative  thereof)  to
organize  any  such  employees.   Further,  (i)  neither  NSP  nor  any  of  its
subsidiaries or joint ventures is a party to any collective bargaining agreement
or other labor agreement with any union or labor organization;  (ii) there is no
unfair labor practice charge or grievance arising out of a collective bargaining
agreement or other grievance procedure against NSP or any of its subsidiaries or
joint ventures pending, or to the knowledge of NSP, threatened, that has had, or
reasonably may be expected by NSP to have, a NSP Material Adverse Effect;  (iii)
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 NSP or any of its subsidiaries or joint ventures  pending,
or to the knowledge of NSP, threatened,  that has, or reasonably may be expected
by NSP to have, a NSP Material Adverse Effect; (iv) there is no strike, dispute,
slowdown,  work  stoppage  or  lockout  pending,  or to the  knowledge  of  NSP,
threatened,  against  or  involving  NSP or any of  its  subsidiaries  or  joint
ventures that has or, insofar as reasonably  can be foreseen,  could have, a NSP
Material Adverse Effect; (v) NSP and each of its subsidiaries and joint ventures
are in compliance with all applicable laws respecting  employment and employment
practices, terms and conditions

                                      -14-


<PAGE>



of employment,  wages, hours of work and occupational safety and health,  except
for non-compliance  that, in the aggregate,  does not, and insofar as reasonably
can be foreseen, will not, have a NSP Material Adverse Effect; and (vi) there is
no proceeding,  claim, suit, action or governmental investigation pending or, to
the  knowledge of NSP,  threatened  in respect to which any  director,  officer,
employee or agent of NSP or any of its  subsidiaries or joint ventures is or may
be  entitled to claim  indemnification  from NSP or any of its  subsidiaries  or
joint ventures pursuant to their respective  articles of incorporation or bylaws
or as provided in the  indemnification  agreements  listed on Section 4.10(l) of
the NSP Disclosure Schedule.

     Section 4.11 Environmental Protection.  Except as specifically disclosed in
the NSP SEC Reports filed prior to the date hereof:

     (a) Compliance.  NSP and each of its  subsidiaries and joint ventures is in
material  compliance  with all  applicable  Environmental  Laws (as  hereinafter
defined in  Section  4.11(g)),  except  where the  failure to be so in  material
compliance  would  not in the  aggregate  have a NSP  Material  Adverse  Effect.
Neither NSP nor any of its  subsidiaries  or joint  ventures  has  received  any
written notice from any person or  Governmental  Authority that alleges that NSP
or any of its subsidiaries or joint ventures is not in material  compliance with
applicable  Environmental  Laws,  except  where the failure to be so in material
compliance would not, in the aggregate, have a NSP Material Adverse Effect.

     (b)  Environmental  Permits.  NSP and  each of its  subsidiaries  or  joint
ventures has obtained or has applied for all material environmental,  health and
safety  permits  and  authorizations  (collectively,   "Environmental  Permits")
necessary  for the  construction  of their  facilities  and the conduct of their
operations,  and all such  Environmental  Permits are in good standing or, where
applicable,  a renewal  application  has been timely filed and is pending agency
approval,  and  NSP and its  subsidiaries  or  joint  ventures  are in  material
compliance with all terms and conditions of all such  Environmental  Permits and
are not  required  to make any  material  expenditures  in  connection  with any
renewal application pending agency approval,  except where the failure to obtain
or be in such compliance and the requirement to make such expenditures would not
have, in the aggregate, a NSP Material Adverse Effect.

     (c) Environmental  Claims.  There is no Environmental Claim (as hereinafter
defined in Section 4.11(g)) pending,  or to the knowledge of NSP, threatened (i)
against  NSP or any of its  subsidiaries  or joint  ventures,  (ii)  against any
person or entity whose liability for any  Environmental  Claim NSP 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  that NSP or any of its  subsidiaries  or joint  ventures
owns,  leases or manages,  in whole or in part,  that, if adversely  determined,
would have, in the aggregate, a NSP Material Adverse Effect.

     (d) Releases.  There has been no Release (as hereinafter defined in Section
4.11(g)) of any Hazardous  Material (as hereinafter  defined in Section 4.11(g))
that would be  reasonably  likely to form the basis of any  Environmental  Claim
against NSP or any subsidiary or

                                      -15-


<PAGE>



joint  venture of NSP, or against any person or entity whose  liability  for any
Environmental  Claim NSP or any  subsidiary  or joint  venture of NSP 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 NSP Material Adverse Effect.

     (e) Predecessors.  With respect to any predecessor of NSP or any subsidiary
or joint venture of NSP,  there are no  Environmental  Claims pending or, to the
knowledge of NSP, threatened,  or any Releases of Hazardous Materials that would
be reasonably  likely to form the basis of any  Environmental  Claims that would
have, or that are reasonably  likely to have, in the  aggregate,  a NSP Material
Adverse Effect.

     (f)  Disclosure.  NSP has  disclosed  to NCE all  material  facts  that NSP
reasonably believes form the basis of a NSP Material Adverse Effect arising from
(i) the cost of pollution  control equipment  currently  required or known to be
required in the future,  (ii) current  investigatory,  removal,  remediation  or
response costs or investigatory, removal, remediation or response costs known to
be required in the future, in each case, both on-site and off-site and (iii) any
other  environmental  matter affecting NSP or its subsidiaries or joint ventures
that would have, or that are reasonably likely to have, in the aggregate,  a NSP
Material Adverse Effect.

     (g) Definitions. 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
     by any person or entity (including,  without  limitation,  any Governmental
     Authority)  alleging potential  liability  (including,  without limitation,
     potential  liability for enforcement costs,  investigatory  costs,  cleanup
     costs,  response costs,  removal costs,  remedial costs,  natural resources
     damages,  property damages,  personal injuries, fines or penalties) arising
     out of,  based  on or  resulting  from  (A) the  presence,  or  Release  or
     threatened Release of any Hazardous  Materials at any location,  whether or
     not owned, operated, leased or managed by NSP or any of its subsidiaries or
     joint  ventures (for purposes of this Section 4.11 only),  or by NCE or any
     of its  subsidiaries or joint ventures (for purposes of Section 5.11 only),
     (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 and 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

                                      -16-


<PAGE>



     Materials   or   otherwise   relating  to  the   manufacture,   processing,
     distribution,  use, treatment,  storage, disposal, transport or handling of
     Hazardous Materials.

          (iii)  "Hazardous  Materials"  means (A) any  petroleum  or  petroleum
     products or petroleum wastes (including crude oil or any fraction thereof),
     radioactive  materials,  friable  asbestos  or friable  asbestos-containing
     material,  urea  formaldehyde  foam  insulation,  and transformers or other
     equipment  that  contain   dielectric  fluid   containing   polychlorinated
     biphenyls, (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 any  Environmental Law in a jurisdiction in which NSP or
     any of its  subsidiaries  or joint  ventures  operates or where any of such
     materials  have  treated,  stored or disposed (for purposes of this Section
     4.11  only) or in which NCE or any of its  subsidiaries  or joint  ventures
     operates or where any of such  materials  have treated,  stored or disposed
     (for purposes of Section 5.11 only).

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

     Section 4.12 Regulation as a Utility.  NSP is regulated as a public utility
in the States of  Minnesota,  North  Dakota,  South Dakota and Arizona and in no
other state. Northern States Power Company, a Wisconsin  corporation  ("NSP-W"),
is regulated as a public  utility in the States of Wisconsin and Michigan and in
no other state.  Neither NSP nor any  subsidiary  company or affiliate of NSP is
subject to regulation as a public utility or public service  company (or similar
designation)  by any other state in the United  States,  by the United States or
any agency or instrumentality of the United States or by any foreign country. As
used in this Section 4.12 and in Section 5.12,  the terms  "subsidiary  company"
and "affiliate" shall have the respective  meanings ascribed to them in the 1935
Act. NSP is a holding  company exempt from all provisions of the 1935 Act except
Section 9(a)(2) pursuant to Section 3(a)(2) of the 1935 Act.

     Section 4.13 Vote Required. The approval of the Merger and the approval and
adoption of this Agreement and the Plan of Merger (i) by a majority of all votes
entitled to be cast by the holders of NSP Common Stock and NSP Preferred  Stock,
voting together as a single class,  and (ii) by a majority of all votes entitled
to be cast by the holders of NSP Common Stock,  voting as a separate class, at a
duly  called  meeting of such  shareholders  at which a quorum is present is the
only vote of the  holders  of any class or  series of the  capital  stock of NSP
required to approve this  Agreement  and the Plan of Merger,  the Merger and the
other transactions contemplated hereby.


                                      -17-


<PAGE>



     Section 4.14 Accounting Matters.  Neither NSP nor, to NSP's knowledge,  any
affiliate  (as  defined in  Section  7.8) of NSP has taken or agreed to take any
action that would prevent NSP from accounting for the business combination to be
effected by the Merger as a  pooling-of-interests  in  accordance  with GAAP and
applicable SEC regulations.

     Section 4.15 Opinion of Financial Advisor.  NSP has received the opinion of
The Blackstone  Group,  LP dated the date hereof,  to the effect that, as of the
date  hereof,  the  Conversion  Ratio is fair to the holders of NSP Common Stock
from a financial point of view.

     Section  4.16  Insurance.  NSP and  each of its  subsidiaries  and,  to the
knowledge of NSP, each of its joint ventures is, and has been continuously since
January 1, 1996,  insured in such  amounts and against  such risks and losses as
are customary for companies  conducting the respective  businesses  conducted by
NSP and its subsidiaries and joint ventures during such time period. Neither NSP
nor any of its  subsidiaries,  nor, to the  knowledge of NSP, any of NSP's joint
ventures has received any written notice of  cancellation  or  termination  with
respect to any material insurance policy. All material insurance policies of NSP
and its subsidiaries  and, to the knowledge of NSP, its joint ventures are valid
and enforceable policies in all material respects.

     Section 4.17 Ownership of NCE Common Stock. NSP does not "beneficially own"
(as such term is defined in Rule 13d-3 under the Exchange Act) any shares of NCE
Common Stock.

     Section 4.18 Year 2000. NSP has  implemented a program which will result in
the computer hardware and software operated by NSP and its subsidiaries or which
is used in the conduct of its  business  being  capable,  prior to December  31,
1999,  of  providing,  except where the failure to so provide  would not, in the
aggregate,  have  a  NSP  Material  Adverse  Effect,   uninterrupted  millennium
functionality to record,  store,  process and present calendar dates on or after
January 1, 2000 in substantially the same manner and with the same functionality
as such hardware and software records,  stores,  processes and presents calendar
dates falling on or before December 31, 1999. NSP reasonably  believes as of the
date hereof that the remaining costs of fully implementing such program will not
exceed the amounts  reflected in the Definitive Proxy Statement filed by NSP for
its 1999 Annual Meeting of Shareholders.

     Section  4.19   Anti-Takeover   Provisions.   None  of  the  control  share
acquisition provisions of Section 302A.671 of the MBCA, the business combination
provisions  of  Section  302A.673  and  302A.675  of the  MBCA  or  any  similar
provisions  of the MBCA or the  articles of  incorporation  or bylaws of NSP are
applicable to the transactions contemplated by this Agreement.

     Section 4.20 Nuclear Operations. Except as disclosed in the NSP SEC Reports
filed prior to the date hereof,  the  operations of NSP's and its  subsidiaries'
and joint ventures',  nuclear generating stations are and have at all times been
conducted in material compliance with applicable health, safety,  regulatory and
other  legal  requirements.  NSP's and its  subsidiaries'  and  joint  ventures'
nuclear  generating  stations maintain emergency plans designed to respond to an
unplanned  release  therefrom of radioactive  materials into the environment and
liability insurance

                                      -18-


<PAGE>



to the extent required by law, and such further  insurance (other than liability
insurance)  as is  consistent  with  NSP's  view of the  risks  inherent  in the
operation of a nuclear power  facility.  NSP's and its  subsidiaries'  and joint
ventures'  plans  for the  decommissioning  of each  of its  nuclear  generating
stations  and for the  short-term  storage of spent  nuclear  fuel  conform with
applicable  regulatory or other legal  requirements,  and such plans have at all
times been funded to the extent  required by law, which is consistent with NSP's
reasonable  budget  projections  for  such  plans.  Neither  NSP  nor any of its
subsidiaries  or joint  ventures  has  incurred  any  liability  as a result  of
operating  nuclear power  facilities for third parties which  liability,  in the
aggregate, would have a NSP Material Adverse Effect.

     Section 4.21 NRC Actions.  Except as disclosed in the NSP SEC Reports filed
prior to the  date  hereof,  neither  NSP nor any of its  subsidiaries  or joint
ventures  has been given  notice of or been  charged  with  actual or  potential
violation  of, or is the subject of any  ongoing  proceeding,  inquiry,  special
inspection,  diagnostic evaluation or other NRC action (including rulemakings of
general application that may effect the conduct of NSP' business regarding NSP's
nuclear  power  facilities)  of which  NSP or any of its  subsidiaries  or joint
ventures  has  received  notice  under the Atomic  Energy  Act,  any  applicable
regulations thereunder or the terms and conditions of any license granted to NSP
or any of its  subsidiaries  or  joint  ventures  regarding  NSP's or any of its
subsidiaries' or joint ventures' nuclear power facilities operated by NSP or any
of its  subsidiaries or joint ventures that would have, or is reasonably  likely
to have, a NSP Material Adverse Effect.

                                    ARTICLE V

                      REPRESENTATIONS AND WARRANTIES OF NCE

     Except as set forth in the  corresponding  sections or  subsections  of the
Disclosure Schedule,  dated as of the date hereof, delivered by NCE to NSP prior
to the  execution  of  this  Agreement  (the  "NCE  Disclosure  Schedule"),  NCE
represents and warrants to NSP as follows:

     Section  5.1   Organization  and   Qualification.   NCE  and  each  of  its
subsidiaries  is a  corporation  or other legal entity duly  organized,  validly
existing and in good standing under the laws of its  jurisdiction  of existence,
has all requisite  power and authority 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  would not, when taken
together with all other such  failures,  have a material  adverse  effect on the
business,  operations,  properties,  assets, condition (financial or otherwise),
prospects or results of operations of NCE and its subsidiaries  taken as a whole
(any such  material  adverse  effect  being  hereinafter  referred  to as a "NCE
Material Adverse Effect"). True, accurate and complete copies of the certificate
of incorporation  and bylaws of NCE, as in effect on the date hereof,  have been
delivered to NSP.


                                      -19-


<PAGE>



     Section  5.2  Subsidiaries.  Section  5.2 of the  NCE  Disclosure  Schedule
contains  a  description  as of the date  hereof of all  subsidiaries  and joint
ventures  of  NCE,  including  the  name of  each  such  entity,  the  state  or
jurisdiction of its incorporation,  a brief description of the principal line or
lines of business conducted by each such entity that is a Significant Subsidiary
and NCE's interest therein. 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 the  1935  Act.  All the  issued  and
outstanding  shares of capital stock of, or other equity  interests in, each NCE
subsidiary  have been duly  authorized  and  validly  issued and are fully paid,
nonassessable  and are owned directly or indirectly by NCE free and clear of any
Liens. 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 NCE consists of
260,000,000 shares of NCE Common Stock and 20,000,000 shares of preferred stock.
As of the close of business on March 22, 1999,  114,924,982 shares of NCE Common
Stock and no shares of preferred stock were issued and  outstanding.  All of the
issued and  outstanding  shares of the capital stock of NCE are validly  issued,
fully paid,  and  nonassessable  and free of preemptive  rights.  As of the date
hereof,  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 NCE or
any of its subsidiaries or joint ventures to issue, deliver or sell, or cause to
be issued,  delivered or sold,  additional  shares of the capital stock or other
voting  securities of NCE or obligating NCE or any of its  subsidiaries or joint
ventures to grant, extend or enter into any such agreement or commitment.

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

     (a) Authority. NCE has all requisite power and authority to enter into this
Agreement and the Plan of Merger and, subject to the NCE Shareholders'  Approval
(as  defined in  Section  5.13) and the NCE  Required  Statutory  Approvals  (as
defined in Section 5.4(c),  to consummate the transactions  contemplated  hereby
and thereby. The Board of Directors of NCE has (i) determined that the Merger is
fair to and in the best interest of NCE and its shareholders,  (ii) approved and
adopted this  Agreement and the Plan of Merger,  and (iii) resolved to recommend
to the  holders of NCE Common  Stock  that they vote in favor of  approving  the
Merger and  approving  and adopting  this  Agreement and the Plan of Merger (the
"NCE Shareholders' Approval").  The execution and delivery of this Agreement and
the Plan of Merger and the consummation by NCE of the transactions  contemplated
hereby and thereby have been duly authorized by all necessary  corporate  action
on the part of NCE, subject to obtaining the NCE  Shareholders'  Approval.  This
Agreement has been and the Plan of Merger will be duly and validly  executed and
delivered by NCE and, assuming the due authorization, execution and

                                      -20-


<PAGE>



delivery hereof and thereof by NSP, this Agreement constitutes,  and the Plan of
Merger  will  constitute,  the  legal,  valid  and  binding  obligation  of  NCE
enforceable against NCE in accordance with the terms hereof and thereof.

     (b) Non-Contravention.  The execution and delivery of this Agreement by NCE
do not,  and the  execution  and delivery by NCE of the Plan of Merger will not,
and the  consummation of the transactions  contemplated  hereby and thereby will
not  result in any  Violation  by NCE or any of its  subsidiaries  or any of its
joint  ventures  under  any  provisions  of (i)  subject  to  obtaining  the NCE
Shareholders'  Approval,  the  certificate of  incorporation,  bylaws or similar
governing  documents of NCE or any of its  subsidiaries or joint ventures,  (ii)
subject to obtaining the NCE Required Statutory Approvals and the receipt of the
NCE Shareholders'  Approval,  any statute,  law,  ordinance,  rule,  regulation,
judgment, decree, order, injunction, writ, permit or license of any Governmental
Authority  applicable  to  NCE or any of  its  material  subsidiaries  or  joint
ventures or any of their  respective  properties or assets,  or (iii) subject to
obtaining  the  third-party  consents or other  approvals  disclosed  in Section
5.4(b) of the NCE Disclosure Schedule (the "NCE 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 NCE or any of its subsidiaries or joint ventures is now a party or
by which any of them or any of their  respective  properties  or  assets  may be
bound or  affected,  excluding  from the  foregoing  clauses (ii) and (iii) such
Violations as would not have, in the aggregate, a NCE Material Adverse Effect.

     (c) Statutory  Approvals.  No declaration,  filing or registration with, or
notice to or authorization, consent, finding by or approval of, any Governmental
Authority,  is necessary for the execution and delivery of this Agreement or the
Plan  of  Merger  by  NCE  or  the  consummation  by  NCE  of  the  transactions
contemplated  hereby or thereby,  which if not  obtained,  made or given,  would
have,  in the  aggregate,  a NCE  Material  Adverse  Effect  (the "NCE  Required
Statutory Approvals"),  it being understood that references in this Agreement to
"obtaining"  such NCE  Required  Statutory  Approvals  shall  mean  making  such
declarations,  filings or  registrations;  giving such  notice;  obtaining  such
consents or approvals;  and having such waiting  periods expire as are necessary
to avoid a violation of law.

     (d) Compliance. Except as specifically disclosed in the NCE SEC Reports (as
defined in Section 5.5) filed prior to the date  hereof,  neither NCE nor any of
its  subsidiaries  or joint  ventures is in violation of or 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,  any  Environmental  Laws), of any Governmental  Authority,
except  for  violations  that  would  not,  in the  aggregate,  have and are not
reasonably  likely  to  have  a  NCE  Material  Adverse  Effect.   NCE  and  its
subsidiaries  and joint  ventures  have all Permits,  except  those  Permits the
failure to obtain which would not have, in the aggregate, a NCE Material Adverse
Effect.

     Section 5.5 Reports and Financial  Statements.  The filings  required to be
made by NCE and its subsidiaries since January 1, 1996 under the Securities Act,
the Exchange Act,

                                      -21-


<PAGE>



the Power Act,  the  Natural Gas Act,  if any,  the Gas Policy Act, if any,  and
applicable state laws and regulations have been filed with the SEC, the FERC, or
the applicable state authorities with jurisdiction over public utilities, 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.  NCE has made
available to NSP a true and complete copy of each report, schedule, registration
statement and definitive proxy statement filed by NCE with the SEC since January
1, 1996 and through the date  hereof (as such  documents  have since the time of
their  filing  been  amended,  the  "NCE  SEC  Reports").  The NCE SEC  Reports,
including  without  limitation  any financial  statements or schedules  included
therein,  at the time filed, and any forms,  reports or other documents filed by
NCE with the SEC after the date hereof, did not and will not, in each case as of
their respective dates,  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  NCE  included  in  the  NCE  SEC  Reports
(collectively,  the "NCE Financial  Statements") have been prepared, and will be
prepared in accordance  with GAAP applied on a consistent  basis  throughout the
periods involved (except as may be indicated  therein or in the notes thereto or
with  respect  to  unaudited  statements,  as  permitted  by Form 10-Q under the
Exchange  Act) and fairly  present in all  material  respects  the  consolidated
financial position of NCE as of the respective dates thereof or the consolidated
results of operations and cash flows for the respective  periods then ended,  as
the  case  may be,  subject,  in the  case of the  unaudited  interim  financial
statements, to normal, recurring audit adjustments.

     Section 5.6 Absence of Certain  Changes or Events.  Except as  specifically
disclosed in the NCE SEC Reports  filed prior to the date hereof,  from December
31, 1998 through the date  hereof,  NCE and each of its  subsidiaries  and joint
ventures have conducted their respective  businesses only in the ordinary course
of business  consistent  with past practice and no event has occurred  which has
had, and no fact or condition exists that would have or is reasonably  likely to
have a NCE Material Adverse Effect.

     Section 5.7  Litigation.  Except as  specifically  disclosed in the NCE SEC
Reports filed prior to the date hereof, (a) there are no claims,  suits, actions
or proceedings  pending or, to the knowledge of NCE,  threatened,  nor are there
any  investigations  or reviews pending or, to the knowledge of NCE,  threatened
against or affecting NCE or any of its  subsidiaries or joint ventures (b) there
have not been any developments  since December 31, 1998 with respect to any such
disclosed claims,  suits, actions,  proceedings,  investigations or reviews, and
(c) there are no judgments, decrees, injunctions,  rules or orders of any court,
governmental department, commission, agency, instrumentality or authority or any
arbitrator  applicable to NCE or any of its subsidiaries or joint ventures that,
in the aggregate,  would have or are  reasonably  likely to have, a NCE 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 NCE for  inclusion or
incorporation by

                                      -22-


<PAGE>



reference in (a) the  Registration  Statement will at the time the  Registration
Statement  becomes  effective  under the Securities Act, and, as the same may be
amended,  at the effective time of such amendment,  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 (b) the
Joint   Proxy   Statement/Prospectus   will,   at  the  date  such  Joint  Proxy
Statement/Prospectus  is mailed to the  shareholders of NCE and NSP, and, as the
same may be  amended  or  supplemented,  at the  times of the  meetings  of such
shareholders  to be held in  connection  with the  Merger,  contain  any  untrue
statement  of a material  fact or omit to state any material  fact  necessary in
order to make the statements  therein, in light of the circumstances under which
they were made, not misleading.  The Registration  Statement and the Joint Proxy
Statement/Prospectus  will comply as to form in all material  respects  with the
provisions  of the  Securities  Act and the  Exchange  Act  and  the  rules  and
regulations thereunder.

     Section  5.9 Tax  Matters.  Except  in the case of the  representations  or
warranties contained in subsections (a), (b), (c), (d), (e), (f), (g), (i), (j),
or (k),  where the  failure  thereof to be true and  correct  would not,  in the
aggregate, have a NCE Material Adverse Effect:

     (a) All Tax Returns in respect of Taxes  required to be filed with  respect
to NCE and each of its subsidiaries  (including the consolidated  federal income
Tax  Return of NCE and any  state Tax  Return  that  includes  NCE or any of its
subsidiaries on a consolidated or combined basis) have been timely filed.

     (b) All Taxes  required  to be shown on such Tax Returns or  otherwise  due
have been timely paid.

     (c) All such Tax Returns are true, correct and complete in all respects.

     (d) No  adjustment  relating to such Tax  Returns (or that could  result in
liability of NCE or any of its subsidiaries on the basis of joint and/or several
liability) has been proposed in writing by any Tax authority.

     (e) There are no pending or  threatened in writing  actions or  proceedings
for the assessment or collection of Taxes against NCE or any of its subsidiaries
(or that could  result in a liability of NCE or any of its  subsidiaries  on the
basis of joint and/or  several  liability) or against any  corporation  that was
included in the filing of a return with NCE on a consolidated or combined basis.

     (f) There are no Tax liens on any assets of NCE or any of its subsidiaries.

     (g) NCE and each of its  subsidiaries has been and continues to be a member
of the affiliated  group (within the meaning of Section  1504(a)(1) of the Code)
for which NCE files a consolidated return as the common parent.


                                      -23-


<PAGE>



     (h) No foreign person owns or has owned beneficially more than five percent
(5%) of the total fair market value of NCE Common  Stock  during the  applicable
period  specified  in Section  897(c)(1)(A)(ii)  of the Code,  and, at all times
during the applicable period specified in Section  897(c)(1)(A)(ii) of the Code,
NCE Common Stock has been regularly traded in an established  securities  market
within the meaning of Treas. Reg. Section 1.897-1(m).

     (i) There are no outstanding waivers or agreements extending the statute of
limitations  for any period  with  respect to any Tax to which NCE or any of its
subsidiaries may be subject.

     (j) Neither NCE nor any of its subsidiaries  has any (i) income  reportable
for a period  ending after the Closing Date but  attributable  to a  transaction
(e.g., an installment  sale) occurring in or a change in accounting  method made
from a period  ending  on or prior  to the  Closing  Date  which  resulted  in a
deferred  reporting  of income  from  such  transaction  or from such  change in
accounting  method  (other than a deferred  intercompany  transaction),  or (ii)
deferred gain or loss arising out of any deferred intercompany transaction.

     (k) No power of attorney  that is  currently in force has been granted with
respect to any  matter  relating  to Taxes  that could  affect NCE or any of its
subsidiaries.

     (l) NCE has no  knowledge  of any fact,  nor has NCE taken any action  that
would, or would be reasonably  likely to, adversely affect the  qualification of
the Merger as a reorganization described in Section 368(a) of the Code.

     (m)  For  purposes  of  Code  Section  357(c),  the  sum of the  amount  of
liabilities  of NCE plus the amount of  liabilities to which the property of NCE
is subject,  does not exceed the total of the adjusted  basis of the property of
NCE.

     Section 5.10 Employee Matters; ERISA.

     (a) Each "employee benefit plan" (as defined in Section 3(3) of ERISA, each
other bonus, deferred compensation,  stock option, severance,  change in control
or other written plan or policy  relating to  compensation,  fringe  benefits or
perquisites  for current or former  directors  or employees of NCE or any of its
subsidiaries  that  is  maintained  or  contributed  to by  NCE  or  any  of its
subsidiaries, each employment, severance, change-in-control or similar agreement
that exists between NCE or any of its subsidiaries and any officer of NCE or any
of its  subsidiaries  that provides for base pay in excess of $150,000 per year,
and each other employment,  severance,  change in control or similar arrangement
that exists  between NCE or any of its  subsidiaries  and any employee of NCE or
any of its  subsidiaries  that  provides  severance,  change in control or other
similar  payments or benefits  which  exceed three times the  employee's  annual
compensation (collectively,  the "NCE Employee Benefit Plans"), and each current
or former  employee or director  eligible to  participate in the NCE 1999 Senior
Executive  Severance  Policy is listed in Section  5.10(a) of the NCE Disclosure
Schedule.  Except  where the  failure to be in material  compliance  or to be so
operated would not, in the aggregate, have a NCE Material

                                      -24-


<PAGE>



Adverse Effect,  each NCE Employee  Benefit Plan and each employee  benefit plan
and each  bonus,  deferred  compensation,  stock  option,  severance,  change in
control or other written  plan,  agreement or policy  relating to  compensation,
fringe benefits or perquisites  for current or former  directors or employees of
any of NCE's joint ventures (collectively, the "NCE Joint Venture Plans"), is in
substantial compliance with applicable law, including, without limitation, ERISA
and the Code, and has been administered and operated in all material respects in
accordance  with its terms.  Each NCE  Employee  Benefit Plan and each NCE Joint
Venture  Plan which is  intended to be  qualified  within the meaning of Section
401(a) of the Code has  received a favorable  determination  letter from the IRS
and, to the  knowledge of NCE, no event has  occurred  and no  condition  exists
which  could  reasonably  be expected  to result in the  revocation  of any such
determination.

     (b) NCE has provided  complete and correct  copies of all plan documents of
the NCE Employee  Benefit Plans listed in Section  4.10(a) of the NCE Disclosure
Schedule,  including  but not  limited to, plan  amendments,  trust  agreements,
insurance  contracts  or  other  documents  establishing  funding  arrangements,
service  provider  contracts,  investment  management  and  investment  advisory
agreements,   all  advance   determination   letters   from  the  IRS,   summary
modifications  thereto,  the last five  years'  Form  5500s and the most  recent
actuarial and financial statements.

     (c) No NCE Employee Benefit Plan is or ever has been subject to Title IV of
ERISA or the funding  requirements of Section 412 of the Code.  Neither NCE, its
subsidiaries,  nor any other entity under common  control with NCE or any of its
subsidiaries  (as  determined  under  Code  Sections  414(b)  and (c)) (the "NCE
Control  Group") has any liability under Title IV of ERISA or Section 412 of the
Code with respect to any employee benefit plan other than a NCE Employee Benefit
Plan,  which  liability has not been satisfied in full. No NCE Employee  Benefit
Plan or NCE Joint Venture Plan subject to Title IV of ERISA has been  terminated
or is, to the knowledge of NCE, currently the subject of termination proceedings
pursuant to Title IV of ERISA.

     (d) No event which constitutes a "reportable  event" (as defined in Section
4043(b) of ERISA) for which the 30-day notice requirement has not been waived by
the PBGC has occurred with respect to any NCE Employee Benefit Plan or NCE Joint
Venture Plan, except for reportable  events which would not,  individually or in
the aggregate, have a NCE Material Adverse Effect.

     (e) Except where the failure to pay any such  amounts  would not have a NCE
Material Adverse Effect,  full payment has been made of all amounts which NCE or
any of its  subsidiaries  or joint  ventures was required under the terms of NCE
Employee Benefit Plans and NCE Joint Venture Plans to have paid as contributions
to such plans on or prior to the  Closing  Date  (excluding  any amounts not yet
due) and no NCE Employee Benefit Plan or NCE Joint Venture Plan which is subject
to Part III of  Subtitle  B of Title I of ERISA has  incurred  any  "accumulated
funding deficiency" within the meaning of Section 302 of ERISA or Section 412 of
the Code), whether or not waived.

                                      -25-


<PAGE>




     (f) No liability,  claim,  action or litigation  has been  incurred,  made,
commenced  or, to the  knowledge of NCE,  threatened by or against NCE or any of
its  subsidiaries  or joint  ventures  with respect to any NCE Employee  Benefit
Plans or NCE  Joint  Venture  Plans  including,  without  limitation,  liability
incurred  under  Title  IV of ERISA  (other  than for  benefits  payable  in the
ordinary  course and PBGC  insurance  premiums) or Section  412(f) or (n) of the
Code by any entity required to be aggregated with NCE or any of its subsidiaries
or joint ventures  pursuant to Section 4001(b) of ERISA and/or Section 414(b) or
(c) of the Code (and the regulations promulgated thereunder) with respect to any
"employee  pension  benefit plan" (as defined in Section 3(2) of ERISA),  except
for the liabilities, claims, actions or litigation which, individually or in the
aggregate, would not have a NCE Material Adverse Effect.

     (g) Neither NCE nor any of its  subsidiaries  or joint ventures nor, to the
knowledge of NCE,  any other  "disqualified  person" or "party in interest"  (as
defined  in  Section  4975(e)(2)  of the Code and  Section  3(14) of ERISA)  has
engaged in any transaction in connection  with any NCE Employee  Benefit Plan or
NCE Joint  Venture  Plan that  could  reasonably  be  expected  to result in the
imposition of a material penalty  pursuant to Section 502(i) of ERISA,  material
damages  pursuant to Section 409 of ERISA or a material  tax pursuant to Section
4975(a) of the Code.  No NCE Employee  Benefit Plan or NCE Joint Venture Plan or
related trust owns any securities in violation of Section 407 of ERISA except as
would not have a NCE Material Adverse Effect.

     (h) With  respect  to each NCE  Employee  Benefit  Plan and each NCE  Joint
Venture  Plan  which is  subject  to Title IV of  ERISA,  as of the most  recent
actuarial   valuation  report  prepared  for  each  such  plan  and  based  upon
assumptions  set forth  therein,  the  aggregate  present  value of the  accrued
liabilities thereof did not exceed the aggregate fair market value of the assets
allocable thereto.

     (i) Each NCE Employee Benefit Plan and each NCE Joint Venture Plan which is
a  Multiemployer  Plan or a  Multiple  Employer  Plan to which NCE or any of its
subsidiaries  or joint ventures is obligated to contribute is identified as such
in Section 4.10(i) of the NCE Disclosure Schedule. All contributions required to
have  been  made by NCE or any of its  subsidiaries  or  joint  ventures  to any
Multiemployer  Plan  have  been  made on a timely  basis.  No  member of the NCE
Controlled  Group  has  incurred  any  withdrawal  liability  that  has not been
satisfied  in full or at any time during the last six years has  withdrawn  from
any  Multiemployer  Plan or Multiple  Employer  Plan.  With  respect to each NCE
Employee  Benefit Plan and each NCE Joint  Venture Plan that is a  Multiemployer
Plan:  (i) if NCE or any of its  subsidiaries  or joint ventures or any of their
respective ERISA Affiliates,  as applicable,  were to experience a withdrawal or
partial  withdrawal  from such plan, no withdrawal  liability  would be incurred
except as would not have a NCE Material Adverse Effect; and (ii) neither NCE nor
any of its subsidiaries or joint ventures has received any notification,  or has
any  reason  to  believe,  that any  such  plan is in  reorganization,  has been
terminated, is insolvent, or may reasonably be expected to be in reorganization,
to be insolvent, or to be terminated.


                                      -26-


<PAGE>



     (j) Neither NCE nor any of its  subsidiaries has maintained any plan (other
than a plan which is  intended to be  "qualified"  within the meaning of Section
401(a) of the Code) which provides  welfare  benefits with respect to current or
former  employees,  current or former officers,  or current or former directors,
following  their  termination  of  service  with NCE or any of its  subsidiaries
(other than as required by Section 601 of ERISA or other  applicable  law). Each
NCE Employee  Benefit Plan or NCE Joint Venture Plan subject to the requirements
of Section 601 of ERISA has been operated in substantial  compliance  therewith,
except as would not have a NCE Material  Adverse Effect.  Neither NCE nor any of
its  subsidiaries  or joint ventures has  contributed to a  nonconforming  group
health  plan (as  defined  in Code  Section  5000(c))  and no  member of the NCE
Control Group has incurred a tax under Code Section  5000(a) that is or could be
a liability  of NCE or any of its  subsidiaries,  except as would not have a NCE
Material Adverse Effect.

     (k) No individual shall accrue or receive additional  benefits,  service or
accelerated  vesting or rights to payment as a direct result of the transactions
contemplated  by this Agreement and no payment or benefit  accrued under any NCE
Employee  Benefit  Plan  or  NCE  Joint  Venture  Plan  or  other  agreement  or
arrangement  of NCE  or  any of its  subsidiaries  or  joint  ventures  will  be
nondeductible under Code Sections 162(m) or 280G.

     (l) To the  knowledge  of NCE, as of the date  hereof,  there is no current
labor union  representation  question  involving  employees of NCE or any of its
subsidiaries or joint ventures, nor does NCE or any of its subsidiaries or joint
ventures  know of any  activity  or  proceeding  of any labor  organization  (or
representative  thereof)  or  employee  group  (or  representative  thereof)  to
organize  any  such  employees.   Further,  (i)  neither  NCE  nor  any  of  its
subsidiaries or joint ventures is a party to any collective bargaining agreement
or other labor agreement with any union or labor organization;  (ii) there is no
unfair labor practice charge or grievance arising out of a collective bargaining
agreement or other grievance procedure against NCE or any of its subsidiaries or
joint ventures pending, or to the knowledge of NCE, threatened, that has had, or
reasonably may be expected by NCE to have, a NCE Material Adverse Effect;  (iii)
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 NCE or any of its subsidiaries or joint ventures  pending,
or to the knowledge of NCE, threatened,  that has, or reasonably may be expected
by NCE to have, a NCE Material Adverse Effect; (iv) there is no strike, dispute,
slowdown,  work  stoppage  or  lockout  pending,  or to the  knowledge  of  NCE,
threatened,  against  or  involving  NCE or any of  its  subsidiaries  or  joint
ventures that has or, insofar as reasonably  can be foreseen,  could have, a NCE
Material Adverse Effect; (v) NCE and each of its subsidiaries and joint ventures
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  that,  in  the
aggregate, does not, and insofar as reasonably can be foreseen, will not, have a
NCE Material  Adverse  Effect;  and (vi) there is no  proceeding,  claim,  suit,
action  or  governmental  investigation  pending  or, to the  knowledge  of NCE,
threatened in respect to which

                                      -27-


<PAGE>



any director,  officer,  employee or agent of NCE or any of its  subsidiaries or
joint ventures is or may be entitled to claim indemnification from NCE or any of
its  subsidiaries  or joint ventures  pursuant to their  respective  articles of
incorporation or bylaws or as provided in the indemnification  agreements listed
on Section 4.10(l) of the NCE Disclosure Schedule.

     Section 5.11 Environmental Protection.  Except as specifically disclosed in
the NCE SEC Reports filed prior to the date hereof:

     (a) Compliance.  NCE and each of its  subsidiaries and joint ventures is in
material  compliance with all applicable  Environmental  Laws,  except where the
failure to be so in material  compliance  would not in the aggregate  have a NCE
Material  Adverse  Effect.  Neither  NCE nor any of its  subsidiaries  or  joint
ventures  has  received  any  written  notice  from any  person or  Governmental
Authority that alleges that NCE or any of its  subsidiaries or joint ventures is
not in material compliance with applicable  Environmental Laws, except where the
failure to be so in material compliance would not have, in the aggregate,  a NCE
Material Adverse Effect.

     (b)  Environmental  Permits.  NCE and each of its  subsidiaries  and  joint
ventures  has  obtained or has applied for all  material  Environmental  Permits
necessary  for the  construction  of their  facilities  and the conduct of their
operations,  and all such  Environmental  Permits are in good standing or, where
applicable,  a renewal  application  has been timely filed and is pending agency
approval,  and  NCE and its  subsidiaries  or  joint  ventures  are in  material
compliance with all terms and conditions of all such  Environmental  Permits and
are not  required  to make any  material  expenditures  in  connection  with any
renewal application pending agency approval,  except where the failure to obtain
or be in such compliance and the requirement to make such expenditures would not
have, in the aggregate, a NCE Material Adverse Effect.

     (c) Environmental  Claims.  There is no Environmental  Claim pending, or to
the knowledge of NCE,  threatened (i) against NCE or any of its  subsidiaries or
joint  ventures,  (ii)  against  any person or entity  whose  liability  for any
Environmental  Claim NCE 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  that NCE or any of its
subsidiaries  or joint  ventures owns,  leases or manages,  in whole or in part,
that,  if adversely  determined,  would have, in the  aggregate,  a NCE Material
Adverse Effect.

     (d)  Releases.  There has been no Release of any  Hazardous  Material  that
would be reasonably likely to form the basis of any Environmental  Claim against
NCE or any  subsidiary  or joint venture of NCE, or against any person or entity
whose  liability  for any  Environmental  Claim NCE or any  subsidiary  or joint
venture of NCE 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 NCE Material Adverse Effect.

     (e) Predecessors.  With respect to any predecessor of NCE or any subsidiary
or joint venture of NCE,  there are no  Environmental  Claims pending or, to the
knowledge of NCE, threatened,  or any Releases of Hazardous Materials that would
be reasonably likely to form

                                      -28-


<PAGE>



the basis of any  Environmental  Claims that would have, or that are  reasonably
likely to have, in the aggregate, a NCE Material Adverse Effect.

     (f)  Disclosure.  NCE has  disclosed  to NSP all  material  facts  that NCE
reasonably believes form the basis of a NCE Material Adverse Effect arising from
(i) the cost of pollution  control equipment  currently  required or known to be
required in the future,  (ii) current  investigatory,  removal,  remediation  or
response costs or investigatory, removal, remediation or response costs known to
be required in the future,  in each case, both on-site and offsite and (iii) any
other environmental matter affecting NCE or its subsidiaries that would have, or
that are  reasonably  likely to have, in the aggregate,  a NCE Material  Adverse
Effect.

     Section 5.12 Regulation as a Utility.  Subsidiaries of NCE are regulated as
public utilities in the States of Colorado,  Kansas, New Mexico, Oklahoma, Texas
and Wyoming and in no other  state.  Neither NCE nor any  subsidiary  company or
affiliate of NCE is subject to regulation as a public  utility or public service
company (or similar designation) by any other state in the United States, by the
United  States or any agency or  instrumentality  of the United States or by any
foreign country. NCE is a registered holding company under the 1935 Act.

     Section 5.13 Vote Required. (a) The approval of the Merger and the approval
and adoption of this Agreement and the Plan of Merger by a majority of all votes
entitled to be cast by the holders of NCE Common Stock at a duly called  meeting
of such  shareholders  at  which a quorum  is  present  is the only  vote of the
holders of any class or series of the capital  stock of NCE  required to approve
this  Agreement  and the Plan of Merger,  the Merger and the other  transactions
contemplated hereby.

     (b) None of the  shareholders of NCE are entitled to exercise any appraisal
rights in connection with the NCE Shareholders' Approval.

     Section 5.14 Accounting Matters.  Neither NCE nor, to NCE's knowledge,  any
affiliate  (as defined in Section  7.8) of NCE,  has taken or agreed to take any
action that would prevent NSP from accounting for the business combination to be
effected by the Merger as a  pooling-of-interests  in  accordance  with GAAP and
applicable SEC regulations.

     Section 5.15 Opinion of Financial Advisor.  NCE has received the opinion of
SG Barr Devlin (a division of SG Cowen Securities  Corporation),  dated the date
hereof, to the effect that, as of the date hereof,  the Conversion Ratio is fair
to the holders of NCE Common Stock from a financial point of view.

     Section  5.16  Insurance.  NCE and  each of its  subsidiaries  and,  to the
knowledge of NCE, each of its joint ventures is, and has been continuously since
January 1, 1996,  insured in such  amounts and against  such risks and losses as
are customary for companies  conducting the respective  businesses  conducted by
NCE and its subsidiaries and joint ventures during such time period. Neither NCE
nor any of its  subsidiaries,  nor, to the  knowledge of NCE, any of NCE's joint
ventures has received any written notice of  cancellation  or  termination  with
respect to any

                                      -29-


<PAGE>



material  insurance  policy.  All  material  insurance  policies  of NCE and its
subsidiaries  and, to the  knowledge  of NCE,  its joint  ventures are valid and
enforceable policies in all material respects.

     Section 5.17 Ownership of NSP Common Stock. NCE does not "beneficially own"
(as such term is defined in Rule 13d-3 under the Exchange Act) any shares of NSP
Common Stock.

     Section 5.18 Year 2000. NCE has  implemented a program which will result in
the computer hardware and software operated by NCE and its subsidiaries or which
is used in the conduct of its  business  being  capable,  prior to December  31,
1999,  of  providing,  except where the failure to so provide  would not, in the
aggregate,  have  a  NCE  Material  Adverse  Effect,   uninterrupted  millennium
functionality to record,  store,  process and present calendar dates on or after
January 1, 2000 in substantially the same manner and with the same functionality
as such hardware and software records,  stores,  processes and presents calendar
dates falling on or before December 31, 1999. NCE reasonably  believes as of the
date hereof that the remaining costs of fully implementing such program will not
exceed the amounts  reflected in the Form 8-K, dated February 23, 1999, filed by
NCE.

     Section 5.19  Anti-Takeover  Provisions.  None of the business  combination
provisions of Section 203 of the DGCL or the  certificate  of  incorporation  or
bylaws of NCE are applicable to the transactions contemplated by this Agreement.

     Section 5.20 NCE Rights  Agreement.  NCE has taken such action with respect
to all of the  outstanding  rights to purchase  preferred  stock (or, in certain
circumstances,  common stock and/or other  securities) of NCE (the "NCE Rights")
issued pursuant to the Rights Agreement, dated as of August 1, 1997, between NCE
and The Bank of New York, as Rights Agent (the "NCE Rights Agreement"),  so that
(a) as a result of the execution,  delivery or performance of this Agreement and
the consummation of the Merger or any other transaction  contemplated hereby (i)
so long as this  Agreement  has not been  terminated  pursuant to Section 9.1, a
Distribution  Date (as such term is defined in the NCE Rights  Agreement)  shall
not occur or be deemed to occur and (ii) the NCE Rights  shall not  separate (to
the extent that the NCE Rights Agreement otherwise provides for such separation)
or become  exercisable,  and NSP shall not become an  Acquiring  Person (as such
term is defined in the NCE Rights Agreement) and (b) the NCE Rights shall expire
immediately prior to the Effective Time.


                                   ARTICLE VI

                     CONDUCT OF BUSINESS PENDING THE MERGER

     After  the  date  hereof  and  prior  to  the  Effective  Time  or  earlier
termination of this  Agreement,  each of NSP and NCE agrees as to itself and its
subsidiaries,  except as expressly  contemplated or permitted in this Agreement,
or to the extent the other party shall otherwise consent in writing, as follows:

                                      -30-


<PAGE>



     Section 6.1  Ordinary  Course of Business.  Each of NSP and NCE shall,  and
each shall  cause its  respective  subsidiaries  to,  carry on their  respective
businesses  in the usual,  regular  and  ordinary  course  consistent  with past
practice 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 or
planned programs relating to downsizing, re-engineering and similar matters, use
reasonable best efforts to keep available the services of their present officers
and employees,  to the end that their goodwill and ongoing  businesses shall not
be impaired in any material respect at the Effective Time.

     Section 6.2 Dividends.  Neither NSP nor NCE shall,  nor shall either permit
any of its  subsidiaries  to: (a) declare or pay any  dividends on or make other
distributions  in respect of any of their  capital  stock other than (i) to such
party or its wholly-owned  subsidiaries,  (ii) stated dividends on the preferred
stock of any subsidiary of NCE, stated  dividends on NSP Preferred Stock and the
special cash dividend in connection with the amendments to the Restated Articles
of  Incorporation  of NSP to be  considered  at NSP's  1999  Annual  Meeting  of
Shareholders (the "NSP Articles Amendments"),  (iii) regular quarterly dividends
on NSP  Common  Stock with usual  record and  payment  dates not in excess of an
annual rate of $1.50, (iv) regular quarterly  dividends on NCE Common Stock with
usual  record  and  payment  dates not in excess of an annual  rate of $2.32 per
share and (v) dividends by subsidiaries  that are not Significant  Subsidiaries;
(b)  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 (c)  redeem,
repurchase  or otherwise  acquire any shares of their  capital  stock other than
(but in all cases  subject to Section  6.12) (i)  redemptions,  repurchases  and
other acquisitions of shares of capital stock in the ordinary course of business
consistent  with  past  practice  including,  without  limitation,  repurchases,
redemptions  and other  acquisitions in connection  with the  administration  of
employee benefit and dividend reinvestment plans as in effect on the date hereof
in the  ordinary  course  of the  operation  of such  plans,  (ii)  redemptions,
purchases or acquisitions  required by the respective terms of any series of NSP
Preferred  Stock,   (iii)  repurchases  of  NSP  Preferred  Stock  necessary  in
connection  with the exercise of dissenters'  rights by holders of NSP Preferred
Stock in connection  with the NSP Articles  Amendments,  (iv) in connection with
refunding of NSP Preferred Stock at a lower cost of funds as permitted  pursuant
to Section 6.7, (v)  intercompany  acquisitions  of capital stock,  and (vi) the
redemption, if required, of the NCE Rights pursuant to the NCE Rights Agreement.
The last  record date of each of NCE and NSP on or prior to the  Effective  Time
which relates to a regular quarterly  dividend on NCE Common Stock or NSP Common
Stock,  as the case may be,  shall  be the same  date and  shall be prior to the
Effective Time.

     Section 6.3 Issuance of  Securities.  Neither NSP nor NCE shall,  nor shall
either permit any of its subsidiaries  to, issue,  deliver or sell, or authorize
or propose the issuance,  delivery or sale 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 (a) the issuance of common stock pursuant to
(i) the existing  Dividend  Reinvestment and Stock Purchase Plan of NSP, or (ii)
the existing NCE Dividend

                                      -31-


<PAGE>



Reinvestment  and Cash Payment Plan, as applicable,  in each case  consistent in
kind and amount with past practice and in the ordinary  course of business under
such plans substantially in accordance with their present terms, (b) pursuant to
the terms of stock options,  stock  appreciation  rights, and other equity-based
awards granted pursuant to (i) the NSP Executive Long Term Incentive Award Stock
Plan, Stock  Equivalent Plan for Non-Employee  Directors of NSP and NSP Employer
Stock Ownership Plan (the "NSP Equity Plans") or (ii) New Century Energies, Inc.
Employees  Savings and Stock Ownership Plan for  Non-Bargaining  Unit Employees,
New  Century  Energies,  Inc.  Employees  Savings and Stock  Ownership  Plan for
Bargaining Unit Employees and Former Non-Bargaining Unit Employees,  New Century
Energies, Inc. Employee Investment Plan for Bargaining Unit Employees and Former
Non-Bargaining  Unit  Employees,  PSCo Stock Option Plan,  SPS 1989 Stock Option
Plan,  Outside  Directors  Compensation  Plan,  and New Century  Energies,  Inc.
Omnibus  Incentive  Plan (the "NCE Equity  Plans") (such  awards,  collectively,
"Equity  Grants"),  in each  case  that are  outstanding  as of the date of this
Agreement,  (c) the issuance of up to 33,000,000  shares of NSP Common Stock for
general  corporate   purposes,   including  (i)  issuances  in  connection  with
acquisitions, financing and maintenance of financial flexibility, (ii) issuances
as required by the  above-named  employee stock ownership  plans,  and (iii) the
granting  of, and  issuance of shares of common  stock  pursuant  to, new Equity
Grants  under the NSP Equity  Plans,  and (d) the  issuance of up to  21,400,000
shares of NCE  Common  Stock  for  general  corporate  purposes,  including  (i)
issuances  in  connection  with  acquisitions,   financing  and  maintenance  of
financial  flexibility,  (ii) issuances as required by the above-named  employee
stock  ownership  plans,  and (iii) the  granting  of, and issuance of shares of
common stock pursuant to, new Equity Grants under the NCE Equity Plans,  (e) the
issuance by a  wholly-owned  subsidiary  of shares of its  capital  stock to its
parent,  and (f)  the  issuance  or  sale  of  treasury  stock  to  satisfy  the
requirements  to use the  pooling  of  interests  method of  accounting  for the
transaction.

     Section 6.4 Charter  Documents.  Except (a) as  disclosed in Section 6.4 of
the NSP Disclosure Schedule or the NCE Disclosure Schedule and (b) in connection
with the NSP Articles  Amendment,  neither NSP nor NCE shall amend or propose to
amend its articles of  incorporation or certificate of incorporation or by-laws,
except as contemplated herein.  Notwithstanding the foregoing, NSP may amend its
articles of incorporation to eliminate cumulative voting.

     Section 6.5  Acquisitions.  Except as  disclosed  in Section 6.5 of the NSP
Disclosure Schedule or the NCE Disclosure  Schedule,  neither NSP nor NCE shall,
nor shall either permit any of its subsidiaries to, acquire or agree to acquire,
by merging or consolidating with, or by purchasing a substantial equity interest
in or a  substantial  portion  of the  assets  of, or by any other  manner,  any
business  or  any  corporation,   partnership,  association  or  other  business
organization or division  thereof,  or otherwise acquire or agree to acquire any
assets (a) which would,  in the case of either NSP and its  subsidiaries  or NCE
and its  subsidiaries,  require a vote of the shareholders of NSP or NCE, as the
case may be,  or (b) which  would  exceed  $100  million  of  equity  investment
individually or $250 million of equity investment in the aggregate. In the event
that an  acquisition  permitted  pursuant to this  Section  6.5 is  subsequently
disposed of in whole or in part prior to the  Effective  Time,  the net proceeds
from the disposition  shall not be counted against the $250 million of aggregate
equity investments permitted pursuant to the

                                      -32-


<PAGE>



preceding clause (b). Notwithstanding the foregoing, neither party shall acquire
any additional nuclear  generating  facilities without the prior written consent
of the other party.

     Section 6.6 No Dispositions.  Except as disclosed in Section 6.6 of the NSP
Disclosure  Schedule  or  the  NCE  Disclosure  Schedule,  and  other  than  (a)
dispositions  not  exceeding  $100 million  individually  or $250 million in the
aggregate,  (b) as may  be  required  by  law  to  consummate  the  transactions
contemplated hereby, (c) in the ordinary course of business consistent with past
practices or (d)  dispositions  of assets as contemplated by the second sentence
of Section 6.5,  neither NSP nor NCE shall,  nor shall either  permit any of its
subsidiaries to, sell, lease, license,  encumber or otherwise dispose of, any of
its assets that are material,  individually  or in the aggregate,  to such party
and its subsidiaries taken as a whole.

     Section 6.7  Indebtedness.  Except as  disclosed  in Section 6.7 of the NSP
Disclosure Schedule or the NCE Disclosure  Schedule,  neither NSP nor NCE shall,
nor shall either  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) other than (a) short-term  indebtedness  in the ordinary
course of business consistent with past practice,  (b) long-term indebtedness in
connection  with the refinancing of existing  indebtedness  either at its stated
maturity  or at a  lower  cost  of  funds  and  (c)  long-term  indebtedness  in
connection with the refunding of NSP Preferred Stock at a lower cost of funds.

     Section 6.8 Capital Expenditures. Except as disclosed in Section 6.8 of the
NSP Disclosure  Schedule or the NCE  Disclosure  Schedule or as required by law,
neither NSP nor NCE shall,  nor shall either permit any of its  subsidiaries to,
make any capital  expenditures,  other than  capital  expenditures  to repair or
replace facilities  destroyed or damaged due to casualty or accident (whether or
not covered by insurance).

     Section 6.9 Compensation,  Benefits.  Except as disclosed in Section 6.9 of
the NSP Disclosure Schedule or in Section 6.9 of the NCE Disclosure Schedule, as
the case may be,  neither  NSP nor NCE  shall  nor  shall it  permit  any of its
subsidiaries  to, (a) 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  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 (i) pursuant to binding legal  commitments  existing as of
the date hereof, and (ii) normal (including  incentive)  increases,  extensions,
expansions,  enhancements,  amendments  or adoptions  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 and its
subsidiaries  taken  as a whole  or (b)  enter  into or  amend  any  employment,
severance,  special pay arrangement with respect to termination of employment or
other similar contract, agreement or arrangement with

                                      -33-


<PAGE>



any director or officer,  provided,  that the  foregoing  shall not preclude the
implementation  of incentive pay arrangements in the ordinary course of business
consistent with past practice as described in the NCE SEC Reports or the NSP SEC
Reports, as applicable, filed by NCE or NSP, as applicable, prior to the date of
this Agreement.

     Section 6.10 1935 Act. None of the parties hereto shall, nor shall any such
party permit any of its  subsidiaries to, except (i) as required or contemplated
by this Agreement,  or (ii) in the ordinary  course of business  consistent with
past practice and which will have no material  adverse  effect on the ability of
the  parties to obtain any NSP  Required  Statutory  Approvals  or NCE  Required
Statutory  Approvals,  engage  in any  activities  or take  or fail to take  any
actions  that would cause a change in its status,  or that of its  subsidiaries,
under  the 1935 Act  other  than the  application  to the SEC under the 1935 Act
contemplated  by this  Agreement for approval,  to the extent  required,  of the
transactions   contemplated   hereby,   including,   without   limitation,   the
registration of NSP pursuant to the 1935 Act.

     Section 6.11 Accounting. Neither NSP nor NCE shall, nor shall either permit
any of its subsidiaries to, make any changes in their accounting methods, except
as required by law, rule, regulation or GAAP.

     Section 6.12  Pooling.  Neither NSP nor NCE shall,  nor shall either permit
any of its  subsidiaries to, take any actions that would, or would be reasonably
likely to,  prevent the parties from  accounting  for the Merger as a pooling of
interests in accordance with GAAP and applicable SEC regulations.

     Section 6.13 Tax-Free  Status.  Neither NSP nor NCE shall, nor shall either
permit any of its  subsidiaries  to,  take any actions  that would,  or would be
reasonably  likely to,  adversely  affect the  qualification  of the Merger as a
reorganization described in Section 368(a) of the Code.

     Section  6.14  Discharge  of  Liabilities.  Neither  NSP nor NCE shall pay,
discharge or satisfy any material claims,  liabilities or obligations (absolute,
accrued,  asserted  or  unasserted,  contingent  or  otherwise),  other than the
payment,  discharge  or  satisfaction,   in  the  ordinary  course  of  business
consistent  with past  practice  (which  includes the payment of  judgments  and
settlements  and the  refinancing  of existing  indebtedness  for borrowed money
either at its stated maturity or at a lower cost of funds) or in accordance with
their terms,  of 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 or as disclosed in
Section 6.7 of the NSP Disclosure Schedule or the NCE Disclosure Schedule.

     Section  6.15  Cooperation,  Notification.  Each of NSP and NCE shall:  (a)
confer on a regular and frequent basis with one or more  representatives  of the
other to discuss the  general  status of its ongoing  operations;  (b)  promptly
notify  the  other  of any  significant  changes  in its  business,  operations,
properties,  assets,  condition  (financial  or other),  prospects or results of
operations; (c) advise the other of any change or event that has had or, insofar
as reasonably can

                                      -34-


<PAGE>



be foreseen, is reasonably likely to result in, a NSP Material Adverse Effect or
a NCE Material Adverse Effect,  as the case may be; and (d) promptly provide the
other with copies of all filings made by it 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.

     Section 6.16 Rate Matters.  Other than currently pending rate filings, each
of NSP and NCE  shall  cause its  subsidiaries  to,  discuss  with the other any
changes in its or its subsidiaries'  regulated rates or charges (other than fuel
and gas rates or  charges),  standards  of service or  accounting  from those in
effect on the date hereof and consult  with the other 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  neither  NSP nor NCE shall make any filing to change its rates on file with
any state  regulatory  authority or the FERC that would have a material  adverse
effect on the benefits associated with the Merger.

     Section  6.17  Third-Party  Consents.   NSP  shall,  and  shall  cause  its
subsidiaries  to,  use all  commercially  reasonable  efforts  to obtain all NSP
Required  Consents.  NSP shall promptly notify NCE of any failure or anticipated
failure to obtain any such  consents  and, if  requested by NCE,  shall  provide
copies of all NSP Required Consents obtained by NSP to NCE. NCE shall, and shall
cause its subsidiaries to, use all commercially reasonable efforts to obtain all
NCE  Required  Consents.  NCE  shall  promptly  notify  NSP  of any  failure  or
anticipated  failure to obtain any such consents and, if requested by NSP, shall
provide copies of all NCE Required Consents obtained by NCE to NSP.

     Section 6.18 No Breach, Etc. No party shall, nor shall any party permit any
of its  subsidiaries  to, 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 (except  with respect to any  representation  or warranty
that is made as of a specified date).

     Section 6.19 Tax-Exempt  Status. No party hereto shall, nor shall any party
permit any  subsidiary  to, take any action that would be  reasonably  likely to
jeopardize the  qualification  of the  outstanding  revenue bonds issued for the
benefit of NSP (or any  subsidiary  thereof)  or for the  benefit of NCE (or any
subsidiary  thereof) that qualify on the date hereof under Section 142(a) of the
Code 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.

     Section  6.20  Insurance.  Each of NSP and NCE shall,  and shall  cause its
subsidiaries  to,  maintain with  financially  responsible  insurance  companies
insurance in such amounts and against such risks and losses as are customary for
companies  engaged  in their  respective  industries  (in each  case,  employing
methods of generating  electric power and fuel sources  similar to those methods
employed and fuels used by such party or its subsidiaries).

                                      -35-


<PAGE>




     Section 6.21 Permits.  Each party shall,  and shall cause its  subsidiaries
to, use reasonable  efforts to maintain in effect all existing  Permits pursuant
to which such party or such party's subsidiaries operate.

                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS

     Section  7.1 Access to  Information.  Upon  reasonable  notice,  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  (a)  access  to 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 NRC, the  Department of Justice,  the Federal Trade  Commission,  any
state authority with  jurisdiction over public utilities or any other federal or
any state regulatory  agency or commission,  and (b) all information  concerning
themselves,  their subsidiaries,  directors,  officers and shareholders and such
matters as may be reasonably requested by the other party in connection with any
filings,  applications or approvals  required or contemplated by this Agreement.
All documents and  information  furnished  pursuant to this Section 7.1 shall be
subject to the Confidentiality  Agreement, dated September 24, 1998, between the
NSP and NCE (the  "Confidentiality  Agreement").  The party requesting copies of
any  documents  from  any  other  party  hereto  shall  be  responsible  for all
out-of-pocket  expenses  incurred  by the party to whom such  request is made in
complying with such request,  including any cost of  reproducing  and delivering
any required information.

     Section 7.2 Joint Proxy Statement and Registration Statement.

     (a) Preparation and Filing. As promptly as reasonably practicable after the
date hereof,  the parties  will  prepare and file with the SEC the  Registration
Statement  and  the  Joint  Proxy  Statement/Prospectus   (together  the  "Joint
Proxy/Registration  Statement").  The parties  shall take such actions as may be
reasonably required to cause the Registration Statement to be declared effective
under the  Securities  Act as promptly as  practicable  after such  filing.  The
parties shall also take such action as may be  reasonably  required to cause the
shares  of NSP  Common  Stock  issuable  in  connection  with the  Merger  to be
registered or to obtain an exemption from  registration  under  applicable state
"blue sky" or securities laws. Each of the parties shall furnish all information
concerning  itself that is  required or  customary  for  inclusion  in the Joint
Proxy/Registration Statement. No representation, covenant or agreement contained
in this  Agreement  is made by any party  hereto  with  respect  to  information
supplied by any other party hereto for inclusion in the Joint Proxy/Registration
Statement. The Joint Proxy/Registration

                                      -36-


<PAGE>



Statement  shall comply as to form in all material  respects with the Securities
Act and the rules and regulations thereunder. The parties shall take such action
as may be  reasonably  required  to cause the shares of NSP  Common  Stock to be
issued in the Merger to be approved for listing on the NYSE,  the Pacific  Stock
Exchange,  the Chicago Stock Exchange and any other stock exchanges agreed to by
the parties, each upon official notice of issuance.

     (b)    Letter    of    NSP's    Accountants.     Following    receipt    by
PricewaterhouseCoopers  LLP, NSP's  independent  accountants,  of an appropriate
request from NCE pursuant to Statement on Auditing  Standards No. 72 ("SAS 72"),
NSP shall use its  reasonable  best  efforts to cause to be delivered to NSP and
NCE two (2) letters of  PricewaterhouseCoopers  LLP, one dated a date within two
(2) business days before the effective  date of the  Registration  Statement and
one dated the Closing Date,  and addressed to NSP and NCE, in form and substance
reasonably  satisfactory to NSP and NCE and customary in scope and substance for
"cold comfort" letters  delivered by independent  accountants in connection with
registration  statements  and  proxy  statements  similar  to  the  Joint  Proxy
Statement/Prospectus.  NSP shall use its reasonable  best efforts to cause to be
delivered to NCE a letter from NSP's independent  accountants  addressed to NSP,
dated as of the Closing  Date,  stating  that,  as of the date of their  report,
accounting  for the Merger as a pooling  of  interests  under  Opinion 16 of the
Accounting  Principles  Board  and  applicable  SEC  rules  and  regulations  is
appropriate if the Merger is consummated as contemplated by this Agreement.

     (c) Letter of NCE's Accountants. Following receipt by Arthur Andersen, LLP,
NCE's independent  accountants,  of an appropriate  request from NSP pursuant to
SAS 72, NCE shall use its  reasonable  best  efforts to cause to be delivered to
NCE and NSP two (2) letters of Arthur Andersen, LLP, one dated a date within two
(2) business days before the effective  date of the  Registration  Statement and
one dated the Closing Date,  and addressed to NCE and NSP, in form and substance
satisfactory  to NCE and NSP and  customary  in scope  and  substance  for "cold
comfort"  letters  delivered  by  independent  accountants  in  connection  with
registration  statements  and  proxy  statements  similar  to  the  Joint  Proxy
Statement/Prospectus.  NCE shall use its reasonable  best efforts to cause to be
delivered  to  NSP  and  NSP's  independent  accountants  a  letter  from  NCE's
independent  accountants addressed to NCE, dated as of the Closing Date, stating
that, as of the date of their report,  no conditions  exist that would  preclude
NCE's ability to be a party in a business  combination  to be accounted for as a
pooling of interests.

     Section 7.3 Regulatory Matters.

     (a) HSR Filings. Each party hereto shall file or cause to be filed with the
United States Federal Trade Commission and the Antitrust  Division of the United
States  Department  of Justice any  notifications  required to be filed by their
respective  "ultimate  parent" companies 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 Merger. Such parties will
use all commercially  reasonable efforts to make such filings promptly and shall
respond  promptly to any requests for additional  information  made by either of
such agencies.


                                      -37-


<PAGE>



     (b) Other Regulatory  Approvals.  Each party hereto shall cooperate and use
its  reasonable  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  and all  other  persons  necessary  or  advisable  to
consummate the transactions contemplated by this Agreement,  including,  without
limitation,  the NSP Required Statutory Approvals and the NCE Required Statutory
Approvals.  NCE shall  have the right to  review  and  approve  in  advance  all
characterizations  of the information  relating to NCE, on the one hand, and NSP
shall have the right to review and approve in advance all  characterizations  of
the information relating to NSP, on the other hand, in either case, which appear
in any filing made in  connection  with the  transactions  contemplated  by this
Agreement,  or the Merger, such approvals not to be unreasonably  withheld.  NSP
and NCE shall each consult  with the other with respect to the  obtaining of all
such necessary or advisable permits,  consents,  approvals and authorizations of
Governmental  Authorities  and shall  keep each  other  informed  of the  status
thereof.

     Section 7.4 Shareholder Approvals.

     (a)  Approval of NCE  Shareholders.  NCE shall,  as promptly as  reasonably
practicable  after the date hereof (i) take all steps  reasonably  necessary  to
call,  give notice of,  convene and hold a special  meeting of its  shareholders
(the "NCE Special  Meeting")  for the purpose of securing the NCE  Shareholders'
Approval,    (ii)   distribute   to   its    shareholders    the   Joint   Proxy
Statement/Prospectus  in accordance  with  applicable  federal and state law and
with its  certificate  of  incorporation  and  bylaws,  (iii)  recommend  to its
shareholders  that  they  give the NCE  Shareholders'  Approval  (provided  that
nothing  contained in this  Section 7.4 shall  require the Board of Directors of
NCE to take any  action or  refrain  from  taking  any  action  that such  Board
determines  in good  faith,  based  upon the  advice of  counsel  and such other
matters  as such Board  deems to be  relevant,  would  result in a breach of its
fiduciary duties),  and (iv) cooperate and consult with NSP with respect to each
of the foregoing matters.

     (b)  Approval of NSP  Shareholders.  NSP shall,  as promptly as  reasonably
practicable  after the date hereof (i) take all steps  reasonably  necessary  to
call,  give notice of,  convene and hold a special  meeting of its  shareholders
(the "NSP Special  Meeting")  for the purpose of securing the NSP  Shareholders'
Approval,    (ii)   distribute   to   its    shareholders    the   Joint   Proxy
Statement/Prospectus in accordance with applicable federal and state law and its
articles of incorporation  and bylaws,  (iii) recommend to its shareholders that
they give the NSP  Shareholders'  Approval  (provided that nothing  contained in
this Section 7.4 shall  require the Board of Directors of NSP to take any action
or refrain  from  taking any action  that such Board  determines  in good faith,
based upon the advice of counsel  and such other  matters as such Board deems to
be  relevant,  would  result  in a breach  of its  fiduciary  duties),  and (iv)
cooperate and consult with NCE with respect to each of the foregoing matters.

     (c) Meeting Date. The NSP Special Meeting and the NCE Special Meeting shall
be held on the same day unless otherwise agreed by NSP and NCE.

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<PAGE>




     Section 7.5 Directors' and Officers' Indemnification.

     (a)  Indemnification.  To the extent,  if any,  not provided by an existing
right of  indemnification  or other  agreement  or  policy,  from and  after the
Effective  Time,  NSP shall,  to the fullest extent not prohibited by applicable
law,  indemnify,  defend and hold  harmless  the present  and former  directors,
officers  and  management   employees  of  NCE  and  NSP  and  their  respective
subsidiaries (each an "Indemnified  Party" and,  collectively,  the "Indemnified
Parties") against (i) all losses, expenses (including reasonable attorneys' fees
and expenses), claims, damages, costs, liabilities, judgments or (subject to the
proviso of the next succeeding  sentence) amounts that are paid in settlement of
or in connection with any claim, action, suit, proceeding or investigation based
in whole or in part on or  arising in whole or in part out of the fact that such
person is or was a director, officer or management employee of such party or any
subsidiary thereof, whether pertaining to any matter existing or occurring at or
prior to or after the Effective  Time and whether  asserted or claimed prior to,
at or after the  Effective  Time and (ii) all  liabilities  based in whole or in
part on, or arising in whole or in part out of, or pertaining to this Agreement,
or the transactions contemplated hereby. In the event of any such loss, expense,
claim, damage, cost,  liability,  judgment or settlement (whether or not arising
before the Effective  Time),  (A) NSP shall pay the reasonable fees and expenses
of  counsel  selected  by  the  Indemnified  Parties,  which  counsel  shall  be
reasonably satisfactory to NSP, promptly after statements therefor are received,
and otherwise advance to the Indemnified  Parties upon request  reimbursement of
documented  expenses  reasonably  incurred,  in either  case to the  extent  not
prohibited by the laws of the State of Minnesota, (B) NSP shall cooperate in the
defense of any such  matter and (C) any  determination  required to be made with
respect to whether an Indemnified  Party's  conduct  complies with the standards
under  applicable law or as set forth in NSP's  certificate of  incorporation or
bylaws shall be made by independent  counsel mutually  acceptable to NSP and the
Indemnified  Party;  provided,  however,  that NSP shall  not be liable  for any
settlement  effected  without its written  consent  (which  consent shall not be
unreasonably withheld or delayed). The Indemnified Parties as a group may retain
only one law firm (other than local counsel) with respect to each related matter
except to the extent there is, in the sole opinion of counsel to an  Indemnified
Party,  under applicable  standards of professional  conduct,  a conflict on any
significant issue between positions of any two or more Indemnified  Parties,  in
which case each Indemnified  Party with a conflicting  position on a significant
issue shall be entitled to separate counsel.  In the event any Indemnified Party
is required to bring any action to enforce rights or to collect moneys due under
this  Agreement  and is  successful  in such action,  NSP shall  reimburse  such
Indemnified  Party for all of its expenses in bringing and pursuing such action.
Subject to any limitations under applicable law, each Indemnified Party shall be
entitled to the advancement of expenses to the full extent  contemplated in this
Section 7.5(a) in connection with any such action.

     (b) Insurance.  For a period of six (6) years after the Effective Time, NSP
shall cause to be maintained in effect the policies of directors'  and officers'
liability insurance  maintained by NCE and NSP; provided that NSP may substitute
therefor  policies of at least the same  coverage  containing  terms that are no
less advantageous with respect to matters occurring at or prior to the Effective
Time to the extent such liability insurance can be maintained annually

                                      -39-


<PAGE>



at a cost to NSP not greater  than 200% of the current  annual  premiums for the
policies currently maintained by NCE and NSP for their respective directors' and
officers' liability insurance;  provided further,  that if such insurance cannot
be so maintained or obtained at such cost,  NSP shall maintain or obtain as much
of such insurance as can be so maintained or obtained at a cost equal to 200% of
the current annual premiums of NCE and NSP for their  respective  directors' and
officers' liability insurance.

     (c)  Successors.  In the event NSP or any of its  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 provision shall be made so that the
successors  and assigns of NSP shall  assume the  obligations  set forth in this
Section 7.5.

     (d) Survival of  Indemnification.  To the fullest  extent not prohibited by
law,  from and after the  Effective  Time,  all  rights to  indemnification  now
existing in favor of the employees, agents, directors or officers of NSP and NCE
and their respective subsidiaries with respect to their activities as such prior
to or at the  Effective  Time,  as  provided  in their  respective  articles  of
incorporation or bylaws or  indemnification  agreements in effect on the date of
such  activities  or otherwise in effect on the date hereof,  shall  survive the
Merger 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 or before the date of this Agreement,
(a)  NCE has  delivered  to NSP the NCE  Disclosure  Schedule  accompanied  by a
certificate  signed by the chief  financial  officer of NCE stating that the NCE
Disclosure  Schedule is being delivered  pursuant to this Section 7.6(a) and (b)
NSP  has  delivered  to  NCE  the  NSP  Disclosure  Schedule  accompanied  by  a
certificate  signed by the chief  financial  officer of NSP stating that the NSP
Disclosure  Schedule is being delivered pursuant to this Section 7.6(b). The NCE
Disclosure Schedule and the NSP 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.   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 of this Agreement.

     Section 7.7 Public  Announcements.  NSP and NCE shall  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,  subject  to  each  party's  disclosure
obligations imposed by law or any applicable national securities

                                      -40-


<PAGE>



exchange,  shall not issue any public announcement or statement relating thereto
prior to consultation with the other party.

     Section 7.8  Affiliates.  (a) Prior to the Closing Date, NCE shall identify
in a letter to NSP all persons  who, in the opinion of NCE, may be deemed at the
time  this   Agreement  is  submitted  for  the  NCE   Shareholders'   Approval,
"affiliates"  of NCE, as such term is used in Rule 145 under the  Securities Act
or for purposes of  qualifying  the Merger for pooling of  interests  accounting
treatment under Opinion 16 of the Accounting Principles Board and applicable SEC
rules and  regulations.  NCE shall  deliver such letter to NSP  sufficiently  in
advance  of the  thirtieth  day  preceding  the  Closing  Date  to  allow  NSP a
reasonable  opportunity to review and comment on such letter.  NCE shall use its
reasonable best efforts to cause each person so identified to deliver to NSP not
less  than  thirty  (30) days  prior to the  Closing  Date a  written  agreement
substantially  in the  form  attached  as  Exhibit  C  (each,  a "NCE  Affiliate
Agreement").

     (b) Prior to the Closing  Date,  NSP shall  identify in a letter to NCE all
persons who, in the opinion of NCE, may be deemed to be  "affiliates" of NSP for
purposes of qualifying the Merger for pooling of interests  accounting treatment
under Opinion 16 of the Accounting Principles Board and applicable SEC rules and
regulations. NSP shall deliver such letter to NCE sufficiently in advance of the
thirtieth day  preceding the Closing Date to allow NCE a reasonable  opportunity
to review and comment on such letter.  NSP shall use its reasonable best efforts
to cause each person so  identified to deliver to NCE on or prior to the Closing
Date, a written agreement substantially in the form attached as Exhibit D (each,
a "NSP Affiliate Agreement").

     (c) NSP shall use its  reasonable  best efforts to publish no later than 30
days after the end of the first  month after the  Effective  Time in which there
are at least 30 days of post-Merger  combined operations (which month may be the
month in which the Effective Time occurs), combined sales and net income figures
as contemplated by and in accordance with the terms of the SEC Accounting Series
Release No. 135.

     Section 7.9 Certain Employee Agreements.

     (a) Subject to Section 7.10, NSP and its subsidiaries shall honor,  without
modification,  all contracts,  agreements,  collective bargaining agreements and
commitments  of the  parties  that apply to any current or former  employees  or
current  or  former  directors  of the  parties;  provided,  however,  that this
undertaking  is not  intended  to prevent  NSP from  enforcing  such  contracts,
agreements,  collective bargaining agreements and commitments in accordance with
their terms, or from enforcing any right to amend,  modify,  suspend,  revoke or
terminate  any such  contract,  agreement,  collective  bargaining  agreement or
commitment.

     (b) For all purposes under the employee  benefit plans  providing  benefits
after the Effective  Time to any  individuals  who are employed by NSP or NCE or
any of their respective  subsidiaries,  as the case may be, immediately prior to
the  Effective  Time and who  continue  in the  employment  of NSP or any of its
subsidiaries  after the Effective Time (a"Continuing  Employee"),  such employee
shall be credited in accordance  with the terms of the applicable  plan with his
or

                                      -41-


<PAGE>



her years of  service  before the  Effective  Time,  to the same  extent as such
employee was  entitled,  before the  Effective  Time, to credit for such service
under any similar NSP Employee  Benefit Plan or NCE Employee  Benefit  Plan,  as
applicable,  except to the extent such credit would result in a  duplication  of
benefits. In addition, and without limiting the generality of the foregoing: (i)
each Continuing Employee shall be immediately  eligible to participate,  without
any waiting  time,  in any and all NCE  Employee  Benefit  Plans or NSP Employee
Benefit Plans,  respectively,  or any other employee  benefit plans sponsored by
NSP and its subsidiaries after the Effective Time (such plans,  collectively the
"New Plans") to the extent  coverage  under such plan replaces  coverage under a
comparable NSP Employee Benefit Plan or NCE Employee Benefit Plan, respectively,
in which such employee participates  immediately before or at any time following
the Effective  Time (such plans,  collectively,  the "Old Plans");  and (ii) for
purposes  of each New Plan  providing  medical,  dental,  pharmaceutical  and/or
vision  benefits to any Continuing  Employee,  NSP shall cause all  pre-existing
condition  exclusions and  actively-at-work  requirements of such New Plan to be
waived for such employee and his or her covered dependents, except to the extent
such exclusions and/or  requirements were applicable to such employee and/or his
or her dependents under the applicable Old Plan and NSP shall cause any eligible
expenses incurred by such employee and his or her covered  dependents during the
portion  of the plan year of the Old Plan  ending  on the date  such  employee's
participation  in the  corresponding  New Plan  begins to be taken into  account
under such New Plan for purposes of satisfying all  deductible,  coinsurance and
maximum  out-of-pocket  requirements  applicable to such employee and his or her
covered dependents for the applicable plan year as if such amounts had been paid
in accordance with such New Plan.

     (c) Subject to applicable collective bargaining agreements, for a period of
two (2) years  following  the  Effective  Time,  any  reductions in workforce in
respect of  employees  of NSP and its  subsidiaries  shall be made on a fair and
equitable  basis,  in  light  of the  circumstances  and  the  objectives  to be
achieved,  and without regard to whether such employees were employed before the
Effective Time by NSP or its  subsidiaries or NCE or its  subsidiaries,  and any
employees whose employment is terminated or jobs are eliminated by NSP or any of
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 NSP or any of its subsidiaries.  Any workforce reductions carried out
following the Effective Time by NSP and its  subsidiaries  shall comply with all
applicable collective bargaining  agreements,  laws and regulations,  including,
without  limitation,  the Worker Adjustment and Retraining  Notification Act and
regulations  promulgated  thereunder  and any  comparable  state or  local  law.
However,  no  provision  contained  in this  Section  7.9  shall  be  deemed  to
constitute an employment contract between NSP and any individual, or a waiver of
NSP's right to discharge any employee at any time, with or without cause.

     (d) For a period of not less than one year  following the  Effective  Time,
the  compensation  and employee  benefits  provided to the  individuals  who are
employed by NSP and its subsidiaries  immediately  before the Effective Time who
continue in employment  with NSP and its  subsidiaries  after the Effective Time
(the "NSP Continuing Employees") and the individuals who are employed by NCE and
its subsidiaries immediately before the Effective Time who

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<PAGE>



continue in employment  with NSP and its  subsidiaries  after the Effective Time
(the "NCE Continuing  Employees") shall be no less favorable,  in the aggregate,
than  the  compensation  and  employee  benefits  provided  to such  individuals
immediately  before the Effective Time.  Without  limiting the generality of the
foregoing,  the NSP  Severance  Pay Plan  shall  continue  in effect for the NSP
Continuing Employees without amendment adverse to any participant therein for at
lease one year following the Effective Time.

     Section  7.10  Incentive,  Stock and Other  Plans.  With respect to each of
NCE's Equity Plans and the NCE Dividend Reinvestment and Cash Payment Plan (each
a "Stock Plan")"

     (a) NSP and NCE shall take such action as may be necessary  so that,  after
the Effective  Time,  such Stock Plan shall provide for the issuance only of NSP
Common  Stock with  appropriate  adjustments  to reflect the  Conversion  Ratio,
provided  that with  respect  to each Stock Plan  pursuant  to which  options to
purchase NCE Common Stock ("NCE Options") are outstanding  immediately  prior to
the  Effective  Time,  each NCE Option shall  entitle the holder to purchase the
number  of NSP  Shares  that is equal to the  product  of (i) the  number of NCE
Shares subject to such option  immediately  prior to the Effective Time and (ii)
the  Conversion  Ratio;  and the  exercise  price per NSP Share  subject to such
option shall be equal to (i) the exercise price per NCE Share  immediately prior
to the Effective Time divided by (ii) the Conversion Ratio.  Notwithstanding the
foregoing, the number of shares of NSP Common Stock deliverable upon exercise of
a NCE Option at and after the Effective  Time as  contemplated  by the foregoing
paragraph shall be rounded,  if necessary,  to the nearest whole share,  and the
exercise  price with respect  thereto  shall be rounded,  if  necessary,  to the
nearest one  one-hundredth  of a cent.  Other than as provided in the  following
paragraph  and in the  prior  sentence  of this  paragraph,  as of and after the
Effective  Time,  each  NCE  Option  shall be  subject  to the  same  terms  and
conditions  as in effect  immediately  prior to the Effective  Time,  but giving
effect to the Merger.

     (b) NSP shall (i) take all corporate  action  necessary or  appropriate  to
obtain  shareholder  approval with respect to such Stock Plan to the extent such
approval  is  required  for  purposes of the Code or  otherwise  required  under
applicable  law, or, to the extent NSP deems it desirable,  to enable such Stock
Plan to provide  appropriate  exemptions under Rule 16b-3  promulgated under the
Exchange  Act,  (ii)  reserve for  issuance  under such Stock Plan or  otherwise
provide a  sufficient  number of shares of NSP Common  Stock for  delivery  upon
payment of  benefits,  grants of awards or exercise of options  under such Stock
Plan and (iii) as soon as practicable after the Effective Time, file one or more
registration  statements  under the Securities Act with respect to the shares of
NSP  Common  Stock  subject to such  Stock  Plan to the  extent  such  filing is
required under  applicable  law and use its reasonable  best efforts to maintain
the effectiveness of such  registration  statement(s) (and the current status of
the prospectuses contained therein or related thereto) so long as such benefits,
grants or awards remain payable or such options remain outstanding,  as the case
may be. With respect to those  individuals  who subsequent to the Merger will be
subject to the reporting  requirements  under Section 16(a) of the Exchange Act,
NSP shall  administer  the  Stock  Plans,  where  applicable,  in a manner  that
complies with Rule 16b-3 under the Exchange Act.


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<PAGE>



     Section  7.11 No  Solicitations.  Subject  to the fourth  sentence  of this
Section 7.11,  neither party hereto shall,  nor shall each such party permit its
subsidiaries  or any of its  Representatives  to, (a)  directly  or  indirectly,
initiate,  solicit or encourage,  or take any action to facilitate the making of
any offer or proposal that  constitutes  or is reasonably  likely to lead to any
Takeover Proposal (as defined below),  or (b) directly or indirectly,  engage in
negotiations  or  provide  any  confidential  information  or data to any person
relating to any Takeover Proposal.  Each party shall notify the other 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 and shall give the
other five (5) days' 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 other  persons
conducted  heretofore  with  respect to any Takeover  Proposal.  Notwithstanding
anything in this Section  7.11 to the  contrary,  in response to an  unsolicited
Takeover Proposal for the acquisition, directly or indirectly, of 50% or more of
the combined voting power of the shares of NCE Common Stock or NSP Common Stock,
as the case may be, or all or substantially  all of the assets of such party and
its  subsidiaries,  taken as a whole,  and which did not result from a breach of
this  Section  7.11,  unless  the  NSP   Shareholders'   Approval  and  the  NCE
Shareholders'  Approval have both been obtained,  NSP or NCE may (i) participate
in discussions or negotiations regarding the Takeover Proposal, and (ii) furnish
information to, and afford access to the  properties,  books and records of such
party and its  subsidiaries  to the person  making the  Takeover  Proposal  with
respect to such  party by such  person,  if but only to the extent  that (A) the
Board of Directors of such party has  reasonably  concluded in good faith (after
consultation  with its financial  advisors)  that the person or group making the
Takeover  Proposal  will have adequate  sources of financing to  consummate  the
Takeover  Proposal  and that the  Takeover  Proposal is more  favorable  to such
party's  shareholders than the Merger,  (B) the Board of Directors of such party
shall have  determined  in good faith,  based on advice of outside  counsel with
respect to such Board's  fiduciary  duties under  applicable law with respect to
the  proposed  Takeover  Proposal  and such other  matters  as such Board  deems
relevant,  that it is necessary to do so in order to act in a manner  consistent
with its fiduciary  duties to its  shareholders,  and (C) such party has entered
into a  confidentiality  agreement  with the person or group making the Takeover
Proposal  containing  terms and  conditions no less favorable to such party than
the  Confidentiality  Agreement,  it being understood that nothing herein to the
contrary  shall restrict the Board of Directors of NSP or the Board of Directors
of NCE,  as the  case may be,  from  exercising  its  authority  under  any such
confidentiality  agreement as it may deem  appropriate.  As used in this Section
7.11,  "Takeover  Proposal"  shall  mean  with  respect  to NCE or NSP means any
inquiry,  proposal  or offer from any person  relating to any direct or indirect
acquisition  or purchase of a business that  constitutes  15% or more of the net
revenues,  net  income  or the  assets of NCE and its  subsidiaries,  taken as a
whole, or NSP and it  subsidiaries,  taken as a whole, as applicable,  or 15% or
more  of any  class  of  equity  securities  of  NCE  or any of its  Significant
Subsidiaries or NSP or any of its Significant  Subsidiaries,  as applicable,  or
any merger, consolidation, business combination, recapitalization,  liquidation,
dissolution  or  similar  transaction  involving  NCE or any of its  Significant
Subsidiaries or NSP or any of its Significant Subsidiaries, as applicable, other
than the transactions contemplated by this Agreement.

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<PAGE>




     Section 7.12 NSP Board of  Directors.  NSP's Board of  Directors  will take
such action as may be necessary (a) to cause the number of directors  comprising
the full Board of Directors of NSP at the Effective Time to be an even number of
up to 14 persons, half of whom shall be designated by NSP prior to the Effective
Time from its then existing Board of Directors (each, a "NSP Designee") and half
of whom shall be  designated  by NCE prior to the  Effective  Time from its then
existing Board of Directors (each a "NCE Designee");  provided, however, that if
prior to the date that is three years after the Effective  Time,  any of the NSP
Designees or NCE Designees  shall  decline or be unable to serve,  the remaining
NSP Designees or NCE Designees,  respectively,  shall  designate or nominate for
any election by the shareholders  another person to serve in that person's place
and NSP shall use its best  efforts to the fullest  extent  permitted  by law to
cause  the  election  of  such  nominated  person  as a  director  of NSP by the
shareholders  of NSP (such  nominated  person  also being  referred  to as a NSP
Designee or NCE Designee,  as the case may be); and (b) to cause James J. Howard
to remain Chairman of the NSP Board of Directors until the first  anniversary of
the Closing Date, and thereafter,  to cause Wayne H. Brunetti to become Chairman
of the NSP Board of Directors.  The initial  designation of such directors among
the three classes of the Directors of NSP shall be accomplished in such a manner
so that, to the extent possible,  there are an equal number of NSP Designees and
NCE Designees in each class.  At the Effective Time, the committees of the Board
of  Directors  of NSP shall be as  follows:  (i) audit,  (ii)  compensation  and
nominating, (iii) finance, and (iv) operations and nuclear.

     Section 7.13 NSP Officers. NSP will take such action as may be necessary to
cause Wayne H. Brunetti to become the President and Chief  Executive  Officer of
NSP at the  Effective  Time.  If prior to the date that is three years after the
Effective  Time,  Wayne H.  Brunetti  shall  decline  or be  unable  to serve as
President and Chief Executive  Officer of NSP, the election of a successor Chief
Executive  Officer  shall  require the  affirmative  vote of  two-thirds  of the
post-Effective Time directors of NSP then serving on the NSP Board of Directors.

     Section 7.14  Corporate  Offices.  Following the Effective  Time, NSP shall
maintain its corporate  headquarters  in  Minneapolis,  Minnesota but shall have
significant  operating  offices in Denver,  Colorado and  Amarillo,  Texas.  Any
decision  to  relocate  the  corporate  headquarters  of NSP  prior to the third
anniversary  of the  Effective  Time  shall  require  the  affirmative  vote  of
two-thirds of the  post-Effective  Time directors of NSP then serving on the NSP
Board of Directors.

     Section  7.15  Expenses.  Subject to Section 7.1 and 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  incurred  in  connection  with  printing  the Joint  Proxy
Statement/Prospectus,  as well as the  filing  fee  relating  thereto,  shall be
shared equally by NSP, on the one hand, and NCE, on the other hand.


                                      -45-


<PAGE>



     Section 7.16 Name of NSP.  Immediately  after the Effective Time, NSP shall
file an amendment to its articles of  incorporation to change its name to a name
mutually agreed upon by NSP and NCE.

     Section  7.17  Transfer  of Assets.  Except as  otherwise  provided in this
Section 7.17, at or prior to the Effective  Time,  NSP will take such actions as
may be necessary  in order,  (a) to  contribute,  transfer,  assign,  convey and
deliver to a newly formed wholly-owned subsidiary of NSP ("NSP Utility Sub"), as
a capital  contribution  or in  exchange  for shares of NSP  Utility Sub capital
stock,  all of NSP's  assets  other  than the  stock  of its  subsidiaries  (the
"Contributed  Assets")  and (b) to cause NSP  Utility Sub to assume all of NSP's
liabilities  and  obligations in respect of the  Contributed  Assets as the same
shall  exist at the  Effective  Time  (collectively,  the "NSP  Restructuring").
Notwithstanding  the foregoing,  (i) NSP shall not be obligated to undertake the
NSP  Restructuring if the NSP  Restructuring  would cause a NSP Material Adverse
Effect,  and (ii) if the NSP  Restructuring  would cause a NSP Material  Adverse
Effect,  the parties shall  negotiate the adoption of an  alternative to the NSP
Restructuring in good faith.

     Section 7.18 Further Assurances.

     (a) Each of NCE and NSP shall, and shall cause its subsidiaries to, execute
such further  documents  and  instruments  and take such further  actions as may
reasonably be requested by the other in order to consummate the Merger and other
transactions  contemplated  by this  Agreement  and to use its  reasonable  best
efforts to take or cause to be taken all actions,  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  Merger  and  the  other  transactions
contemplated  hereby  (subject  to the votes of its  shareholders  described  in
Sections 4.13 and 5.13,  respectively),  including  fully  cooperating  with the
other in  obtaining  the NCE  Required  Statutory  Approvals,  the NSP  Required
Statutory   Approvals  and  all  other  approvals  and   authorizations  of  any
Governmental  Authorities  necessary or advisable to consummate the transactions
contemplated hereby.

     (b) NCE and NSP shall be responsible for the taking of any action necessary
or advisable to obtain the NCE Required  Statutory  Approvals  and to obtain the
NSP Required Statutory Approvals,  respectively.  NCE and NSP agree to cooperate
in obtaining  the necessary  approvals  from the NRC, the FERC and the SEC under
the 1935 Act, the  Securities  Act and the Exchange Act and from the  applicable
state  authorities with jurisdiction over public utilities and under state "blue
sky" or securities laws. NCE and NSP shall each provide the other with copies of
any  filings  made with any  Governmental  Authorities  in  connection  with the
foregoing.


                                      -46-


<PAGE>



                                  ARTICLE VIII

                                   CONDITIONS

     Section 8.1 Conditions to Each Party's Obligation to Effect the Merger. The
respective  obligations  of NCE and NSP to effect the Merger 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 NCE  Shareholders'  Approval  and the NSP
Shareholders' 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 the Merger shall have been issued and continuing in effect,  and
the Merger and the other  transactions  contemplated  hereby shall not have been
prohibited under any applicable federal or state law or regulation.

     (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 NSP  Common  Stock  issuable  in the
Merger  pursuant to Article II shall have been  approved for listing on the NYSE
upon official notice of issuance.

     (e)  Pooling.  Each of NSP and NCE shall  have  received  the letter of its
independent  public  accountants,  dated the Closing Date, in form and substance
reasonably satisfactory to NCE and NSP, respectively, to the effect set forth in
the last  sentence of Section  7.2(b) and the last  sentence of Section  7.2(c),
respectively.

     (f) Statutory  Approvals.  The NSP Required Statutory Approvals and the NCE
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 NSP Material  Adverse  Effect or a NCE
Material Adverse Effect. A "Final Order" means action by the relevant regulatory
authority that 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.

     Section 8.2  Conditions  to  Obligation  of NCE to Effect the  Merger.  The
obligation  of  NCE to  effect  the  Merger  shall  be  further  subject  to the
satisfaction, on or prior to

                                      -47-


<PAGE>



the Closing Date, of the following conditions, except as may be waived by NCE in
writing pursuant to Section 9.5:

     (a)  Performance  of  Obligations  of NSP. NSP shall have  performed in all
material  respects  (and in the  case  of  Section  6.2,  in all  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
NSP set  forth in this  Agreement  shall be true  and  correct  on and as of the
Closing  Date with the same  force and  effect as if made on and as of such date
(except for  representations  and warranties  that expressly speak only as of an
earlier date, in which case, such  representations  and warranties shall be true
and  correct  as  of  such   earlier   date),   except  for  such   failures  of
representations  and warranties to be true and correct (without giving effect to
any materiality  qualification or standard contained in any such representations
and  warranties)  which, in the aggregate,  would not be reasonably  expected to
have a NSP Material Adverse Effect.

     (c) Closing  Certificates.  NCE shall have received a certificate signed by
the Chief  Executive  Officer  and Chief  Financial  Officer  of NSP,  dated the
Closing Date, to the effect that, to the best of each such officer's  knowledge,
the  conditions  set  forth in  Section  8.2(a)  and  Section  8.2(b)  have been
satisfied.

     (d) No NSP Material  Adverse Effect.  No NSP Material  Adverse Effect shall
have occurred and there shall exist no fact or circumstance  that would have, or
would be reasonably likely to have, a NSP Material Adverse Effect.

     (e) Tax Opinion. NCE shall have received an opinion of counsel, in form and
substance reasonably  satisfactory to NCE, dated the Closing Date, which opinion
may be based on appropriate  representations of NSP and NCE that are in form and
substance reasonably satisfactory to such counsel, to the effect that the Merger
will be treated as a  transaction  described  in Section  368(a) of the Code and
that no gain or loss  will  be  recognized  by the  stockholders  of NCE who are
United  States  persons and who  exchange NCE Common Stock solely for NSP Common
Stock  pursuant to the Merger  (except with respect to cash  received in lieu of
fractional shares).

     (f) NSP Required Consents.  The NSP Required Consents, the failure of which
to be  obtained  would  have a NSP  Material  Adverse  Effect,  shall  have been
obtained.

     Section 8.3  Conditions  to  Obligation  of NSP to Effect the  Merger.  The
obligation  of  NSP to  effect  the  Merger  shall  be  further  subject  to the
satisfaction, on or prior to

                                      -48-


<PAGE>



the Closing Date, of the following conditions, except as may be waived by NSP in
writing pursuant to Section 9.5:

     (a)  Performance  of  Obligations  of NCE. NCE shall have  performed in all
material  respects  (and in the  case  of  Section  6.2,  in all  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
NCE set  forth in this  Agreement  shall be true  and  correct  on and as of the
Closing  Date with the same  force and  effect as if made on and as of such date
(except for  representations  and warranties  that expressly speak only as of an
earlier date, in which case, such  representations  and warranties shall be true
and  correct  as  of  such   earlier   date),   except  for  such   failures  of
representations  and warranties to be true and correct (without giving effect to
any materiality  qualification or standard contained in any such representations
and  warranties)  which, in the aggregate,  would not be reasonably  expected to
have a NCE Material Adverse Effect.

     (c) Closing  Certificates.  NSP shall have received a certificate signed by
the Chief  Executive  Officer  and Chief  Financial  Officer  of NCE,  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.

     (d) No NCE Material  Adverse Effect.  No NCE Material  Adverse Effect shall
have occurred and there shall exist no fact or circumstance  that would have, or
would be reasonably likely to have, a NCE Material Adverse Effect.

     (e) Tax Opinion. NSP shall have received an opinion of counsel, in form and
substance reasonably  satisfactory to NSP, dated the Closing Date, which opinion
may be based on appropriate  representations of NSP and NCE that are in form and
substance reasonably satisfactory to such counsel, to the effect that the Merger
will be treated as a transaction described in Section 368(a) of the Code.

     (f) NCE Required Consents.  The NCE Required Consents, the failure of which
to be  obtained  would  have a NCE  Material  Adverse  Effect,  shall  have been
obtained.

                                   ARTICLE IX

                        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 shareholders of the
respective parties hereto contemplated by this Agreement:

     (a) by mutual written consent of the Boards of Directors of NSP and NCE;

                                      -49-


<PAGE>




     (b) by NSP or NCE, by written  notice to the other,  if the Effective  Time
shall not have  occurred on or before March 24, 2000;  provided,  however,  that
such date shall  automatically be extended to December 24, 2000 if, on March 24,
2000,  (i) the condition set forth in Section  8.1(f) has not been  satisfied or
waived;  (ii) the  other  conditions  to the  consummation  of the  transactions
contemplated hereby are then capable of being satisfied; and (iii) any approvals
required by Section  8.1(f) that have not yet been  obtained  are being  pursued
with  diligence;  provided  further,  that the right to terminate this Agreement
under this Section  9.1(b) shall not be available to any party whose  failure to
fulfill any  obligation  under this Agreement has been the cause of, or resulted
in, the  failure  of the  Effective  Time to occur on or before the  termination
date;

     (c) by NSP  or  NCE,  by  written  notice  to the  other,  if (i)  the  NSP
Shareholders'  Approval  shall not have been obtained at a duly held NSP Special
Meeting,  including  any  adjournments  thereof,  or (ii) the NCE  Shareholders'
Approval  shall  not have been  obtained  at a duly  held NCE  Special  Meeting,
including any adjournments thereof;

     (d) by NSP or NCE,  by  written  notice to the  other,  if (i) any state or
federal  law,  order,  rule or  regulation  is adopted  or issued,  that has the
effect,  as supported by the written,  reasoned  opinion of outside  counsel for
such party, of prohibiting  the Merger or causing a NSP Material  Adverse Effect
or NCE Material Adverse Effect,  or if (ii) 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  the  Merger or
causing a NSP Material Adverse Effect or NCE Material  Adverse Effect,  and such
order, judgment or decree shall have become final and nonappealable;

     (e) prior to the NCE  Shareholders'  Approval,  by NCE,  upon two (2) days'
prior written  notice to NSP, if, as a result of a tender offer by a party other
than NSP or any of its  affiliates  or any written offer or proposal to acquire,
directly or indirectly,  50% or more of the combined  voting power of the shares
of NCE  Common  Stock or all or  substantially  all of the assets of NCE and its
subsidiaries,  taken as a whole (each, a "NCE Business Combination"),  the Board
of Directors of NCE determines  that such tender offer or other written offer or
proposal be accepted;  provided, however, that (i) (A) the Board of Directors of
NCE has  reasonably  concluded  in  good  faith  (after  consultation  with  its
financial  advisors)  that  the  person  or  group  proposing  the NCE  Business
Combination  will have  adequate  sources of  financing  to  consummate  the NCE
Business  Combination  and that the Business  Combination  is more  favorable to
NCE's  shareholders  than the Merger and (B) the Board of Directors of NCE shall
have  determined in good faith,  based on advice of outside counsel with respect
to such  Board's  fiduciary  duties  under  applicable  law with  respect to the
proposed  NCE  Business  Combination  and such  other  matters  as the  Board of
Directors deem to be relevant,  that,  notwithstanding  a binding  commitment to
consummate  an  agreement  of the nature of this  Agreement  entered into in the
proper exercise of their applicable  fiduciary duties, and  notwithstanding  all
concessions that may be offered by NSP in negotiations  entered into pursuant to
clause (ii) below,  such  fiduciary  duties would also require the  directors to
reconsider  such  commitment  as a result of such tender  offer or such  written
offer

                                      -50-


<PAGE>



or proposal and (ii) prior to any such  termination,  NCE shall, and shall cause
its respective  financial and legal advisors to, negotiate with NSP to make such
adjustments in the terms and conditions of this Agreement as would enable NCE to
proceed with the transactions  contemplated herein;  provided further,  that NSP
and NCE  acknowledge and affirm that,  notwithstanding  anything in this Section
9.1(e) to the  contrary,  NSP and NCE intend this  Agreement  to be an exclusive
agreement and, accordingly,  nothing in this Agreement is intended to constitute
a solicitation of an offer or proposal for a NCE Business Combination,  it being
acknowledged and agreed that any such offer or proposal would interfere with the
strategic  advantages  and  benefits  that NSP and NCE expect to derive from the
Merger and other transactions contemplated hereby;

     (f) prior to the NSP  Shareholders'  Approval,  by NSP,  upon two (2) days'
prior written  notice to NCE, if, as a result of a tender offer by a party other
than NCE or any of its  affiliates  or any written offer or proposal to acquire,
directly or  indirectly,  50% or more of the  combined  voting  power of the NSP
Common  Stock  or  all  or  substantially  all of the  assets  of  NSP  and  its
subsidiaries, taken as a whole (each a "NSP Business Combination"), the Board of
Directors of NSP  determines  that such tender offer or other  written  offer or
proposal be accepted;  provided, however, that (i) (A) the Board of Directors of
such party has reasonably  concluded in good faith (after  consultation with its
financial  advisors)  that the  person or group  making  the  proposing  the NSP
Business  Combination  will have adequate sources of financing to consummate the
NSP Business Combination and that the NSP Business Combination is more favorable
to NSP's  shareholders  than the  Merger and (B) the Board of  Directors  of NSP
shall have  determined  in good faith,  based on advice of outside  counsel with
respect to such Board's  fiduciary  duties under  applicable law with respect to
the  proposed NSP Business  Combination  and such other  matters as the Board of
Directors deem to be relevant,  that,  notwithstanding  a binding  commitment to
consummate  an  agreement  of the nature of this  Agreement  entered into in the
proper exercise of their applicable  fiduciary duties, and  notwithstanding  all
concessions that may be offered by NCE in negotiations  entered into pursuant to
clause (ii) below,  such  fiduciary  duties would also require the  directors to
reconsider  such  commitment  as a result of such tender  offer or such  written
offer or proposal and (ii) prior to any such  termination,  NSP shall, and shall
cause its respective financial and legal advisors to, negotiate with NCE to make
such  adjustments  in the terms and conditions of this Agreement as would enable
NSP to proceed with the transactions contemplated herein; provided further, that
NSP and NCE  acknowledge  and  affirm  that,  notwithstanding  anything  in this
Section  9.1(f) to the  contrary,  NSP and NCE intend  this  Agreement  to be an
exclusive agreement and,  accordingly,  nothing in this Agreement is intended to
constitute  a  solicitation   of  an  offer  or  proposal  for  a  NSP  Business
Combination,  it being  acknowledged  and agreed that any such offer or proposal
would  interfere  with the  strategic  advantages  and benefits that NSP and NCE
expect to derive from the Merger and other transactions contemplated hereby;

     (g) by NCE, by written  notice to NSP,  if (i) there exist  breaches of the
representations  and  warranties  of NSP made herein as of the date hereof which
breaches,  individually or in the aggregate, would or would be reasonably likely
to result in a NSP Material  Adverse  Effect,  and such breaches  shall not have
been remedied  within twenty (20) days after receipt by NSP of notice in writing
from NCE, specifying the nature of such breaches and

                                      -51-


<PAGE>



requesting that they be remedied, (ii) NSP (and/or its appropriate subsidiaries)
shall  not have  performed  and  complied  with  its  agreements  and  covenants
contained  in Section 6.2  (Dividends),  and in all material  respects  with its
agreements and covenants  contained in Section 6.3 (Issuance of Securities)  and
Section 6.7  (Indebtedness)  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  twenty (20)
days after receipt by NSP of a notice in writing from NCE, specifying the nature
of such failure and requesting that it be remedied; (iii) the Board of Directors
of NSP or any  committee  thereof  (A) shall  withdraw  or modify in any  manner
adverse to NCE its approval or  recommendation  of this Agreement or the Merger,
(B) shall fail to reaffirm such approval or  recommendation  within fifteen (15)
days of NCE's request, (C) shall approve or recommend any Takeover Proposal,  in
each  case,  by a party  other  than NCE or any of its  affiliates  or (D) shall
resolve to take any of the actions specified in clause (A), (B) or (C).

     (h) by NSP, by written  notice to NCE,  if (i) there exist  breaches of the
representations  and  warranties  of NCE made herein as of the date hereof which
breaches,  individually or in the aggregate, would or would be reasonably likely
to result in a NCE Material  Adverse  Effect,  and such breaches  shall not have
been remedied  within twenty (20) days after receipt by NSP of notice in writing
from NSP,  specifying  the nature of such breaches and  requesting  that they be
remedied,  (ii)  NCE  (and/or  its  appropriate  subsidiaries)  shall  not  have
performed and complied with its  agreements  and covenants  contained in Section
6.2 (Dividends),  and in all material respects with its agreements and covenants
contained in Section 6.3 (Issuance of Securities) and Section 6.7 (Indebtedness)
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 twenty (20) days after receipt by NCE of a
notice in writing from NSP, specifying the nature of such failure and requesting
that it be remedied;  or (iii) the Board of  Directors  of NCE or any  committee
thereof (A) shall  withdraw or modify in any manner  adverse to NSP its approval
or  recommendation  of this Agreement or the Merger,  (B) shall fail to reaffirm
such approval or recommendation  within fifteen (15) days of NSP's request,  (C)
shall approve or recommend any Takeover Proposal, in each case, by a party other
than  NSP or any of its  affiliates  or (D)  shall  resolve  to take  any of the
actions specified in clause (A), (B) or (C).

     (i) by NSP, by written notice to NCE, if, except as contemplated by Section
5.20, NCE (i) redeems the NCE Rights or amends the NCE Rights  Agreement so that
NCE Rights expire prior to the Effective  Time, or (ii) prior to the termination
of this Agreement,  amends the NCE Rights  Agreement in a manner which amends or
alters the  circumstances  under which,  or the time at which,  any person shall
become an "acquiring  person" (as defined in the NCE Rights  Agreement) or which
alters in any  material  respect  the rights of the holders of the NCE Rights on
the occurrence of any such event.

     Section  9.2 Effect of  Termination.  In the event of  termination  of this
Agreement  by either NSP or NCE  pursuant  to  Section  9.1,  there  shall be no
liability  on the part of  either  NSP or NCE or their  respective  officers  or
directors hereunder, except that Section 7.17, Section 9.3

                                      -52-


<PAGE>



and Section 10.9 and the agreement  contained in the second to the last sentence
of Section 7.1 shall survive any such termination.

     Section 9.3 Termination Fee; Expenses.

     (a) Expenses Payable upon Breach. If this Agreement is terminated  pursuant
to one (but not both) of (1) Section  9.1(g)(i) or (ii) or (2) Section 9.1(h)(i)
or (ii),  then the breaching party (the  "Nonterminating  Party") shall promptly
(but not later than five (5) business days after receipt of notice of the amount
due from the other  party) pay to the  terminating  party an amount equal to all
documented  out-of-pocket  expenses and fees incurred by such terminating  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  Merger  or the  transactions
contemplated  by this  Agreement)  not to exceed  $25,000,000  in the  aggregate
("Out-of-Pocket  Expenses");  provided,  however,  that,  if this  Agreement  is
terminated under the  circumstances  described above by a party as a result of a
willful breach or failure to perform or comply with  agreements and covenants by
the  Nonterminating  Party,  the  terminating  party  may  pursue  any  remedies
available  to it at law or in equity  and such  party's  Out-of-Pocket  Expenses
shall not be limited to $25,000,000.

     (b)  Termination  Fee  Payable  upon  Acceptance  of  a  Proposal.  If  NCE
terminates this Agreement pursuant to Section 9.1(e),  simultaneously  with such
termination it shall pay to NSP a fee equal to $150,000,000  plus  Out-of-Pocket
Expenses.   If  NSP  terminates  this  Agreement  pursuant  to  Section  9.1(f),
simultaneously  with  such  termination  it  shall  pay  to NCE a fee  equal  to
$150,000,000 plus Out-of-Pocket Expenses.

     (c)  Termination  Fee In Certain  Other  Events.  (i) If this  Agreement is
terminated by NCE pursuant to Section  9.1(g)(iii),  then NSP shall pay to NCE a
termination  fee equal to  $150,000,000  plus  Out-of-Pocket  Expenses.  If this
Agreement is terminated by NSP pursuant to Section  9.1(h)(iii) or 9.1(i),  then
NCE shall pay to NSP a termination fee equal to $150,000,000 plus  Out-of-Pocket
Expenses. Notwithstanding the foregoing, no such amounts shall be payable if and
to the  extent  the  party to make such  payment  shall  have paid such  amounts
pursuant  to Section  9.3(a),  Section  9.3(b),  Section  9.3(c)(ii)  or Section
9.3(c)(iii).

     (ii) If this  Agreement is terminated (A) pursuant to Section  9.1(b),  (B)
pursuant to Section  9.1(c)  following a failure of the  shareholders  of NSP to
grant the  necessary  approvals  described in Section  4.13 (a "NSP  Shareholder
Disapproval"),  or (C) as a result of a material  breach by NSP of Section  7.4,
and (1) at the time of such  termination  (or,  in the  case of any  termination
following a NSP Shareholder Disapproval,  at the time of the shareholder meeting
at which such NSP  Shareholder  Disapproval  occurred),  there shall have been a
Takeover  Proposal  involving NSP which, at the time of such  termination (or of
the meeting of NSP's  shareholders)  shall not have been (y) rejected by NSP and
its Board of Directors  and (z)  withdrawn  by the third  party,  and (2) within
eighteen  months of such  termination  NSP shall have  entered into a definitive
agreement  with respect to a NSP Business  Combination,  then  promptly (but not
later than five (5) business days after receipt of notice of the amount due from
NCE) NSP shall pay to NCE a

                                      -53-


<PAGE>



termination fee equal to $150,000,000  plus  Out-of-Pocket  Expenses;  provided,
however,  that no such  amounts  shall be payable if and to the extent NSP shall
have paid such amounts  pursuant to Section  9.3(a),  Section  9.3(b) or Section
9.1(c)(i).

     (iii) If this Agreement is terminated (A) pursuant to Section  9.1(b),  (B)
pursuant to Section  9.1(c)  following a failure of the  shareholders  of NCE to
grant the  necessary  approvals  described in Section  5.13 (a "NCE  Shareholder
Disapproval"),  or (C) as a result of a material  breach by NCE of Section  7.4,
and (1) at the time of such  termination  (or,  in the  case of any  termination
following a NCE Shareholder Disapproval,  at the time of the shareholder meeting
at which such NCE  Shareholder  Disapproval  occurred),  there shall have been a
Takeover  Proposal  involving NCE which, at the time of such  termination (or of
the meeting of NCE's  shareholders)  shall not have been (y) rejected by NCE and
its Board of Directors  and (z)  withdrawn  by the third  party,  and (2) within
eighteen  months of such  termination  NCE shall have  entered into a definitive
agreement  with respect to a NCE Business  Combination,  then  promptly (but not
later than five (5) business days after receipt of notice of the amount due from
NSP)  NCE  shall  pay  to NSP a  termination  fee  equal  to  $150,000,000  plus
Out-of-Pocket Expenses; provided, however, that no such amounts shall be payable
if and to the  extent  NCE shall  have paid such  amounts  pursuant  to  Section
9.3(a), Section 9.3(b), or Section 9.1(c)(i).

     (d)  Expenses.  The parties  agree that the  agreements  contained  in this
Section  9.3 are an  integral  part  of the  transactions  contemplated  by this
Agreement  and  constitute  liquidated  damages and not a penalty.  If one party
fails to promptly pay to the other any fees due hereunder, such 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  Citigroup,  N.A. in effect
from time to time 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 the respective Boards of Directors of each of NSP and NCE,
at any time before or after approval  hereof by the  shareholders of NSP and NCE
and prior to the Effective  Time,  but after such  approvals,  no such amendment
shall (a) alter or change  the  amount or kind of  shares,  rights or any of the
proceedings  of the Merger  under  Article II, or (b) 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 NSP Common  Stock or NCE Common  Stock,  except for  alterations  or
changes that could  otherwise be adopted by the Board of Directors of NSP and/or
NCE,  without the further  approval of such  shareholders,  as applicable.  This
Agreement may not be amended except by an instrument in writing signed on behalf
of each of the parties hereto.

     Section 9.5 Waiver.  At any time prior to the Effective Time, any party may
(a) extend the time for the  performance of any of the obligations or other acts
of the other party hereto, (b) waive any inaccuracies in the representations and
warranties  of the other party  contained  herein or in any  document  delivered
pursuant hereto and (c) waive compliance with any

                                      -54-


<PAGE>



of the agreements or conditions for such party's benefit contained  herein.  Any
agreement to any such extension or waiver shall be valid only if set forth in an
instrument  in writing  signed by a duly  authorized  officer of the party to be
bound thereby.

                                    ARTICLE X

                               GENERAL PROVISIONS

     Section 10.1  Non-Survival of  Representations,  Warranties,  Covenants and
Agreements. None of the representations, warranties, covenants and agreements in
this  Agreement  shall survive the Merger,  except the covenants and  agreements
contained  in this  Section 10.1 and in Article II  (Treatment  of Shares),  the
second to the last  sentence of Section  7.1  (Certain  Access to  Information),
Section 7.5  (Directors' and Officers'  Indemnification),  Section 7.9 (Employee
Agreements  and Workforce  Matters),  Section 7.10  (Incentive,  Stock and Other
Plans),  Section 7.12 (NSP Board of  Directors),  Section  7.13 (NSP  Officers),
Section 7.14 (Corporate Offices),  and Section 10.7 (Parties in Interest),  each
of which shall survive in accordance  with its terms.  The Board of Directors of
NSP shall  delegate to a majority of the NCE  Designees  then serving on the NSP
Board of Directors authority to enforce Section 7.15 hereof and to a majority of
the NSP  Designees  then  serving  on the NSP Board of  Directors  authority  to
enforce Section 7.14 hereof, in each case from and after the Effective Time.

     Section 10.2 Brokers.  NSP  represents  and warrants  that,  except for The
Blackstone  Group,  LP,  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 Merger or the  transactions  contemplated  by
this  Agreement  based  upon  arrangements  made by or on  behalf  of  NSP.  NCE
represents and warrants that, except for S G Barr Devlin, 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  Merger  or the
transactions  contemplated by this Agreement based upon  arrangements made by or
on behalf of NCE.

     Section 10.3 Notices. All notices and other communications  hereunder shall
be in writing and shall be deemed given (a) if delivered  personally,  or (b) if
sent by overnight  courier  service  (receipt  confirmed in writing),  or (c) if
delivered by facsimile  transmission (with receipt  confirmed),  or (d) five (5)
days  after  being  mailed by  registered  or  certified  mail  (return  receipt
requested) to the parties,  in each case to the following  addresses (or at such
other address for a party as shall be specified by like notice):

                  (i)      If to NCE, to:

                           New Century Energies, Inc.
                           1225 17th Street
                           Denver, Colorado 80202
                           Facsimile:  (303) 294-8815
                           Attention: Paul Bonavia

                                      -55-


<PAGE>



                           with a copy to:

                           LeBoeuf, Lamb, Greene & MacRae, L.L.P.
                           125 West 55th Street
                           New York, New York 10019-5389
                           Facsimile:  (212) 424-8500
                           Attention:  Steven H. Davis, Esq.

                           and

                           LeBoeuf, Lamb, Greene & MacRae, L.L.P.
                           633 Seventeenth Street, Suite 2000
                           Denver, Colorado  80202
                           Facsimile:  (303) 297-0422
                           Attention:  Thomas J. Moore, Esq.

                  (ii)     If to NSP, to:

                           Northern States Power Company
                           414 Nicollet Mall
                           4th Floor
                           Minneapolis, Minnesota  55401
                           Facsimile:  (612) 330-6222
                           Attention:  Gary R. Johnson

                           with a copy to:

                           Gardner, Carton & Douglas
                           Quaker Tower
                           321 North Clark Street
                           31st Floor
                           Chicago, Illinois  60610-4795
                           Facsimile:  (312) 644-3381
                           Attention:  Peter Clarke, Esq.

                           Wachtell, Lipton, Rosen & Katz
                           51 West 52nd Street
                           New York, New York  10019
                           Facsimile:  (212) 403-2000
                           Attention:  Seth A. Kaplan, Esq.

     Section 10.4  Miscellaneous.  This  Agreement  (including the documents and
instruments  referred to  herein):  (a)  constitutes  the entire  agreement  and
supersedes all other prior agreements and understandings, both written and oral,
among the parties, or any of them, with

                                      -56-


<PAGE>



respect to the subject matter hereof other than the  Confidentiality  Agreement;
and (b) shall not be assigned by operation of law or otherwise.  This  Agreement
shall be governed by and construed in  accordance  with the laws of the State of
Delaware  applicable to contracts  executed in and to be fully performed in such
State,  without  giving  effect  to its  conflicts  of laws  statutes,  rules or
principles.  The  invalidity  or  unenforceability  of  any  provision  of  this
Agreement shall not affect the validity or enforceability of any other provision
of this  Agreement,  which shall  remain in full force and  effect.  The parties
hereto shall  negotiate in good faith to replace any provision of this Agreement
so held invalid or  unenforceable  with a valid  provision that is as similar as
possible in substance to the invalid or unenforceable provision.

     Section 10.5  Interpretation.  When  reference is made in this Agreement to
Articles,  Sections or Exhibits, such reference shall be to an Article,  Section
or Exhibit of this Agreement,  as the case may be, unless  otherwise  indicated.
The table of contents and headings contained in this Agreement are for reference
purposes 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."  Whenever  "or" is used in this  Agreement it shall be construed in
the nonexclusive sense.

     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 together 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  (Directors'  and  Officers'
Indemnification),  nothing in this Agreement, express or implied, is intended to
confer upon any person any rights or remedies of any nature  whatsoever under or
by reason of this Agreement.

     Section  10.8  Specific   Performance.   The  parties   hereto  agree  that
irreparable  damage would occur in the event that any of the  provisions of this
Agreement  were not performed in accordance  with their  specific  terms or were
otherwise  breached.  It is accordingly  agreed that the parties hereto shall be
entitled to an injunction or injunctions  to prevent  breaches of this Agreement
and to enforce  specifically the terms and provisions hereof in any court of the
United States located in the State of Delaware or any state having jurisdiction,
this being in addition to any other  remedy to which they are entitled at law or
in equity. In addition, each of the parties hereto (a) consents to submit itself
to the  personal  jurisdiction  of any  federal  court  located  in the State of
Delaware or any Delaware state court in the event any dispute arises out of this
Agreement or any of the transactions  contemplated by this Agreement, (b) agrees
that it will not attempt to deny such personal  jurisdiction  by motion or other
request  for leave from any such court and (c) agrees that it will not bring any
action  relating to this Agreement or any of the  transactions  contemplated  by
this  Agreement in any court other than a federal or state court  sitting in the
State of Delaware.


                                      -57-


<PAGE>



     Section 10.9 WAIVER OF JURY TRIAL.  EACH PARTY HERETO HEREBY WAIVES, TO THE
FULLEST EXTENT  PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY
JURY IN ANY LEGAL PROCEEDING  DIRECTLY OR INDIRECTLY  ARISING OUT OF OR RELATING
TO THIS  AGREEMENT OR THE  TRANSACTIONS  CONTEMPLATED  HEREBY  (WHETHER BASED ON
CONTRACT,  TORT OR ANY OTHER  THEORY).  EACH PARTY HERETO (A) CERTIFIES  THAT NO
REPRESENTATIVE,  AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED  EXPRESSLY
OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION,  SEEK
TO  ENFORCE  THE  FOREGOING  WAIVER AND (B)  ACKNOWLEDGES  THAT IT AND THE OTHER
PARTIES  HERETO HAVE BEEN INDUCED TO ENTER INTO THIS  AGREEMENT  BY, AMONG OTHER
THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION.

     IN WITNESS WHEREOF,  NSP and NCE have caused this Agreement to be signed by
their respective  officers  thereunto duly authorized as of the date first above
written.

                                  NORTHERN STATES POWER COMPANY


                                  By:           /s/ James J. Howard
                                       Name:        James J. Howard
                                       Title:       Chairman, President and
                                                    Chief Executive Officer


                                  NEW CENTURY ENERGIES, INC.


                                  By:           /s/ Bill D. Helton
                                       Name:        Bill D. Helton
                                       Title:       Chief Executive Officer




                                      -58-


<PAGE>



                             INDEX OF DEFINED TERMS

Term                                                                       Page

1935 Act          ...........................................................6
Agreement         ...........................................................1
Articles of Merger...........................................................2
Atomic Energy Act ...........................................................8
Book Entry Shares ...........................................................3
Certificate       ...........................................................3
Certificate of Merger........................................................2
Closing           ...........................................................5
Closing Date      ...........................................................5
Code              ...........................................................1
Confidentiality Agreement...................................................36
Continuing Employee.........................................................41
Contributed Assets..........................................................46
Conversion Ratio  ...........................................................2
DGCL              ...........................................................2
Disclosure Schedules........................................................40
Effective Time    ...........................................................2
Environmental Claim.........................................................16
Environmental Laws..........................................................16
Environmental Permits.......................................................15
ERISA             ..........................................................11
Exchange Act      ...........................................................6
Exchange Agent    ...........................................................3
FERC              ...........................................................9
Final Order       ..........................................................47
GAAP              ...........................................................1
Gas Policy Act    ...........................................................8
Governmental Authority.......................................................8
Hazardous Materials.........................................................17
HSR Act           ..........................................................37
Indemnified Party ..........................................................39
Joint Proxy Statement/Prospectus............................................10
Joint Proxy/Registration Statement..........................................36
Joint venture     ...........................................................6
Liens             ...........................................................6
MBCA              ...........................................................2
Merger            ...........................................................1
Multiemployer Plan..........................................................13
NCE               ...........................................................1
NCE Affiliate Agreement.....................................................41

                                       -v-


<PAGE>


Term                                                                       Page

NCE Business Combination....................................................50
NCE Common Stock  ...........................................................2
NCE Control Group ..........................................................25
NCE Designee      ..........................................................45
NCE Disclosure Schedule.....................................................19
NCE Employee Benefit Plans..................................................24
NCE Financial Statements....................................................22
NCE Joint Venture Plans.....................................................25
NCE Material Adverse Effect.................................................19
NCE Options       ..........................................................43
NCE Required Consents.......................................................21
NCE Required Statutory Approvals............................................21
NCE Rights        ..........................................................30
NCE Rights Agreement........................................................30
NCE SEC Reports   ..........................................................22
NCE Shareholder Disapproval.................................................54
NCE Shareholders' Approval..................................................20
NCE Shares        ...........................................................3
NCE Special Meeting.........................................................38
New Plans         ..........................................................42
Nonterminating Party........................................................53
NRC               ...........................................................9
NSP               ...........................................................1
NSP Affiliate Agreement.....................................................41
NSP Articles Amendments.....................................................31
NSP Business Combination....................................................51
NSP Common Stock  ...........................................................3
NSP Control Group ..........................................................12
NSP Designee      ..........................................................45
NSP Disclosure Schedule......................................................5
NSP Employee Benefit Plans..................................................12
NSP Financial Statements.....................................................9
NSP Joint Venture Plans.....................................................12
NSP Material Adverse Effect..................................................5
NSP Preferred Stock..........................................................6
NSP Required Consents........................................................8
NSP Required Statutory Approvals.............................................8
NSP Restructuring ..........................................................46
NSP SEC Reports   ...........................................................9
NSP Shareholder Disapproval.................................................53
NSP Shareholders' Approval...................................................7
NSP Shares        ...........................................................3

                                      -vi-


<PAGE>


Term                                                                       Page

NSP Special Meeting.........................................................38
NSP Utility Sub   ..........................................................46
NSP-W             ..........................................................17
NYSE Composite Transition Reports............................................4
Old Plans         ..........................................................42
Out-of-Pocket Expenses......................................................53
PBGC              ..........................................................12
Permits           ...........................................................8
Plan of Merger    ...........................................................1
Power Act         ...........................................................8
Registration Statement......................................................10
Release           ..........................................................17
Representatives   ..........................................................36
SAS 72            ..........................................................37
SEC               ...........................................................1
Section 16        ...........................................................7
Securities Act    ...........................................................8
Significant Subsidiary.......................................................6
Stock Plan        ..........................................................43
Subsidiary        ...........................................................6
Takeover Proposal ..........................................................44
Tax Return        ..........................................................10
Taxes             ..........................................................10
Violation         ...........................................................7


                                      -vii-


<PAGE>




                                                                       EXHIBIT A


                                 PLAN OF MERGER


     PLAN OF MERGER (the "Plan of Merger"), dated as of __________, 200_, by and
between Northern States Power Company, a Minnesota  corporation ("NSP"), and New
Centuries Energies,  Inc., a Delaware  corporation  ("NCE"). The parties to this
Plan  of  Merger  are  hereinafter  sometimes  collectively  referred  to as the
"Constituent Corporations".

     WHEREAS, NCE is a corporation duly organized,  validly existing and in good
standing  under the laws of the State of Delaware.  As of the date  hereof,  the
authorized capital of NCE consists solely of 260,000,000 shares of common stock,
par value $1.00 per share ("NCE Common Stock"),  of which __________ shares were
outstanding on __________,  200_, and 20,000,000  shares of preferred stock, par
value $1.00 per share, of which there were no shares  outstanding on __________,
200_;

     WHEREAS, NSP is a corporation duly organized,  validly existing and in good
standing  under the laws of the State of Minnesota.  As of the date hereof,  the
authorized capital of NSP consists solely of 350,000,000 shares of common stock,
par value $2.50 per share ("NSP Common Stock"),  of which __________ shares were
outstanding on __________,  200_, and 7,000,000  shares of preferred  stock, par
value $100 per share ("NSP Preferred  Stock"),  of which __________  shares were
outstanding  on __________,  200_,  consisting  of:  __________  shares of $3.60
Series,  __________  shares of $4.08 Series,  __________ shares of $4.10 Series,
__________  shares  of $4.11  Series,  __________  shares of $4.16  Series,  and
__________ shares of $4.56 Series;

     WHEREAS,  NSP and NCE have entered  into an  Agreement  and Plan of Merger,
dated  as  of  March  24,  1999,  setting  forth  representations,   warranties,
covenants,  conditions  and other terms in connection  with the merger and other
transactions contemplated thereby and hereby (the "Merger Agreement"); and

     NOW, THEREFORE,  in consideration of the foregoing and the mutual covenants
and agreements herein contained, the parties hereto agree as follows:

                                    ARTICLE I

                                   The Merger

     Section 1.1 The Merger.  Pursuant to this Plan of Merger and upon the terms
and subject to the conditions of the Merger Agreement, at the Effective Time (as
defined  in  Section  1.2),  NCE  shall be  merged  into NSP (the  "Merger")  in
accordance  with the laws of the State of  Minnesota  and the State of Delaware.
NSP shall be the  surviving  corporation  in the Merger  (sometimes  hereinafter
referred to as the  "Surviving  Corporation")  and shall  continue its existence
under the laws of the State of Minnesota and the separate existence of NCE shall
cease.  The effects and  consequences of the Merger shall be as set forth in the
Merger Agreement,  in Section 302A.641 of the Minnesota Business Corporation Act
(the "MBCA") and Section 259(a) of the Delaware General

                                       -1-

<PAGE>



Corporation  Law (the "DGCL").  In  furtherance  of and not in limitation of the
foregoing,  at the Effective Time, the Surviving  Corporation shall have all the
rights, privileges, immunities and powers and shall be subject to all the duties
and  liabilities  of a  corporation  organized  under  the MBCA;  the  Surviving
Corporation  shall  then and  thereafter  possess  all the  rights,  privileges,
immunities,  and franchises, of a public as well as of a private nature, of each
of NCE and NSP; and all property, real, personal, and mixed and all debts due on
whatever  account  and all other  choses in  action,  and every  other  interest
belonging  to or due to each of NCE and NSP so  merged  shall be  vested  in the
Surviving  Corporation  without  further act or deed; the Surviving  Corporation
shall then be liable for all the  liabilities and obligations of each of NCE and
NSP so merged.

     Section 1.2 Effective Time of the Merger. The Merger shall become effective
upon the later of the filing of Articles  of Merger  with  respect to the Merger
with the  Secretary  of State of the  State of  Minnesota  pursuant  to  Section
302A.615 of the MBCA and a Certificate  of Merger with the Secretary of State of
the State of Delaware pursuant to Section 252 of the DGCL, or at such later time
that NSP and NCE  shall  agree as  specified  in such  Articles  of  Merger  and
Certificate of Merger (the time the Merger becomes  effective being  hereinafter
called the "Effective  Time").  If the Merger  Agreement and this Plan of Merger
are duly approved by the  shareholders of each of the Constituent  Corporations,
the other conditions precedent set forth in Article VIII of the Merger Agreement
are  satisfied  or (where  permissible)  waived,  and this Plan of Merger is not
terminated under Section 3.1 hereof,  such Articles of Merger and Certificate of
Merger will be filed with the  Secretaries  of State of the States of  Minnesota
and Delaware, respectively, as described above.

     Section  1.3  Articles  of  Incorporation  and  Bylaws.  At and  after  the
Effective  Time,  (a) the  Restated  Articles  of  Incorporation  of NSP will be
amended as provided in Annex I hereto and, as so amended,  will be the  Articles
of  Incorporation  of the  Surviving  Corporation,  and  (b) the  Bylaws  of NSP
immediately prior to the Effective Time will continue  unchanged and will be the
Bylaws of the Surviving Corporation.


                                   ARTICLE II

                              Conversion of Shares

     Section 2.1 Effect of Merger on Capital  Stock.  At the Effective  Time, by
virtue of the  Merger  and  without  any action on the part of any holder of any
capital stock of NSP or NCE:

     (a)  Cancellation  of Certain  NCE Common  Stock.  Each share of NCE Common
Stock,  together  with any rights to  purchase  preferred  stock (or, in certain
circumstances  common stock and/or other  securities of NCE (the "NCE  Rights"))
that is owned by NSP or any of its  subsidiaries  or held in the treasury of NCE
shall be  cancelled  and shall  cease to exist,  and no  consideration  shall be
delivered in exchange therefor.

     (b) Conversion of Certain NCE Common Stock.  Each share of NCE Common Stock
issued and  outstanding  immediately  prior to the  Effective  Time  (other than
shares  cancelled  pursuant to Section  2.1(a)),  together  with any NCE Rights,
shall be  converted  into the right to  receive  1.55  shares  (the  "Conversion
Ratio") of duly authorized, validly issued, fully paid and

                                       -2-

<PAGE>



nonassessable NSP Common Stock. Upon such conversion,  each holder of any shares
of NCE Common  Stock  (whether  held in book entry or  certificated  form) shall
cease to have any rights with respect  thereto,  except the right to receive the
shares of NSP Common Stock to be issued in  consideration  therefor (and cash in
lieu of fractional shares pursuant to Section 2.2(d)) upon the surrender of such
certificate or otherwise upon compliance with Section 2.2.

     (c) NSP Common Stock to Remain Outstanding.  Each share of NSP Common Stock
and each share of NSP Preferred Stock issued and outstanding  immediately  prior
to the Effective Time shall remain outstanding following the Effective Time.

     Section 2.2 Exchange of NCE Common Stock.

     (a) Deposit with Exchange Agent. As soon as practicable after the Effective
Time,  NSP shall deposit with a bank,  trust company or other agent  selected by
mutual agreement of the parties  ("Exchange  Agent")  certificates  representing
whole  shares of NSP Common Stock to be issued in the Merger as provided in this
Article II.

     (b) Exchange  Procedures.  As soon as practicable after the Effective Time,
the  Exchange  Agent  shall mail to each  holder of record of a  certificate  or
certificates  ("Certificate")  which  immediately  prior to the  Effective  Time
represented  issued and  outstanding  shares of NCE Common Stock ("NCE Shares"),
(i) a  letter  of  transmittal  (which  shall  specify  that  delivery  shall be
effected,  and risk of loss and title to the Certificates  shall pass, only upon
actual delivery of the Certificates to the Exchange Agent) and (ii) instructions
for use in effecting the exchange of Certificates for certificates  representing
shares of NSP Common  Stock ("NSP  Shares")  or for  effecting  the  exchange of
Certificates  for  NSP  Shares  to be  held  in  book  entry  form.  As  soon as
practicable after the Effective Time, the Exchange Agent shall also mail to each
holder of record of NCE Shares  held in book entry form  ("Book  Entry  Shares")
instructions for use in effecting the exchange of said Book Entry Shares for NSP
Shares.  Upon  delivery of a  Certificate  to the Exchange  Agent for  exchange,
together with a duly executed  letter of transmittal and such other documents as
the  Exchange  Agent  shall  require,  or,  in the  case of Book  Entry  Shares,
compliance with the  instructions for the exchange  thereof,  the holder of such
Certificate  or Book Entry  Shares  shall be  entitled  to  receive in  exchange
therefor  that  number of whole  NSP  Shares  and the  amount of cash in lieu of
fractional  share  interests  (pursuant to Section  2.2(d)),  if any, which such
holder has the right to receive  pursuant to the  provisions of this Article II.
In the event of a transfer of ownership of NCE Shares which is not registered in
the transfer records of NCE, the proper number of NSP Shares will be issued to a
transferee if, in addition to the other requirements for exchange,  the Exchange
Agent  receives all documents  required to evidence and effect such transfer and
evidence  satisfactory to the Exchange Agent that any applicable  stock transfer
taxes have been paid.  Until delivered as contemplated by this Section 2.2, each
Certificate,  and until  exchanged as contemplated by this Section 2.2, all Book
Entry Shares,  shall be deemed at any time after the Effective Time to represent
only the right to receive  whole NSP  Shares and cash in lieu of any  fractional
shares of NSP Common Stock as contemplated by this Section 2.2.

     (c) Distributions with Respect to Unexchanged Shares. No dividends or other
distributions  declared  or made after the  Effective  Time with  respect to NSP
Shares with a record

                                       -3-

<PAGE>



date after the  Effective  Time  shall be paid to the holder of any  undelivered
Certificate  or  unexchanged  Book Entry  Shares with  respect to the NSP Shares
represented  thereby,  and no cash payment in lieu of fractional shares shall be
paid to any such holder pursuant to Section  2.2(d),  until the holder of record
of such  Certificate  or  unexchanged  Book  Entry  Shares (or a  transferee  as
described in Section  2.2(b)) shall have delivered such  Certificate or effected
the  exchange  of such Book Entry  Shares as  contemplated  in  Section  2.2(b).
Subject to the effect of unclaimed property,  escheat and other applicable laws,
following  delivery of any such  Certificate  or exchange of any such Book Entry
Shares,  there shall be paid to the record holder (or  transferee)  of the whole
NSP Shares issued in exchange  therefor,  without  interest,  (i) at the time of
such delivery,  the amount of any cash payable in lieu of a fractional  share of
NSP Common Stock to which such holder (or  transferee)  is entitled  pursuant to
Section 2.2(d) and the amount of dividends or other  distributions with a record
date after the Effective  Time  theretofore  paid with respect to such whole NSP
Shares 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
delivery  or  exchange  and a payment  date  subsequent  to delivery or exchange
payable with respect to such whole NSP Shares, as the case may be.

     (d)  No  Fractional  Shares.  (i) No  certificates  or  scrip  representing
fractional  shares of NSP Common  Stock  shall be issued  upon the  delivery  of
Certificates  or  exchange  of Book  Entry  Shares,  and such  fractional  share
interests  will not  entitle  the owner  thereof  to vote or to any  rights of a
shareholder  of NSP.  All  holders of NCE Common  Stock who would  otherwise  be
entitled to receive a  fractional  share of NSP Common Stock shall  receive,  in
lieu  thereof  upon  delivery or  exchange of its NCE Shares,  an amount of cash
determined by  multiplying  the fraction of a share of NSP Common Stock to which
such  shareholder  would otherwise be entitled by the closing sales price of NSP
Common Stock as reported under "NYSE Composite Transition Reports",  in The Wall
Street Journal on the trading day immediately  prior to the Effective Time. From
time to time,  NSP  shall,  subject  to Section  2.2(f)  hereof,  deliver to the
Exchange  Agent cash in such amounts as shall be necessary to pay to the holders
of NCE Shares cash in lieu of fractional shares of NSP Common Stock.

     (e) Closing of Transfer Books. From and after the Effective Time, the stock
transfer  books of NCE with  respect  to shares of NCE Common  Stock  issued and
outstanding  prior to the Effective  Time shall be closed and no transfer of any
such shares shall thereafter be made. If, after the Effective Time, Certificates
are presented to NSP,  they shall be cancelled  and  exchanged for  certificates
representing  the  appropriate  number of whole NSP  Shares  and cash in lieu of
fractional shares of NSP Common Stock as provided in this Section 2.2.

     (f) Termination of Exchange Agent. Any certificates representing NSP Shares
deposited  with the Exchange  Agent pursuant to Section 2.2(a) and not exchanged
within six (6) months  after the  Effective  Time  pursuant to this  Section 2.2
shall be returned by the Exchange  Agent to NSP,  which shall  thereafter act as
Exchange Agent.  All funds held by the Exchange Agent for payment to the holders
of undelivered  Certificates  or unexchanged  Book Entry Shares and unclaimed at
the end of six (6) months  from the  Effective  Time shall be  remitted  to NSP,
after which time any holder of  undelivered  Certificates  or  unexchanged  Book
Entry  Shares shall look as a general  creditor  only to NSP for payment of such
funds to which such holder may be due,

                                       -4-

<PAGE>



subject to applicable law. NSP shall not be liable to any person for such shares
or funds  delivered to a public  official  pursuant to any applicable  abandoned
property, escheat or similar law.

     (g) Adjustment of Conversion  Ratio.  In the event that,  subsequent to the
date  hereof but prior to the  Effective  Time,  the  outstanding  shares of NCE
Common Stock or NSP Common Stock,  respectively,  shall have been changed into a
different  number of shares or a different  class as a result of a stock  split,
reverse stock split, stock dividend, subdivision, reclassification, combination,
exchange,  recapitalization or other similar  transaction,  the Conversion Ratio
shall be  appropriately  adjusted  to provide the holders of NCE Shares the same
economic  effect as  contemplated  by Merger  Agreement  and this Plan of Merger
prior to such event.

                                   ARTICLE III

                            TERMINATION AND AMENDMENT

     Section 3.1 Termination.  Notwithstanding the approval and adoption of this
Plan of Merger by the  shareholders  of NSP and NCE,  this Plan of Merger  shall
terminate  forthwith in the event that the Merger  Agreement shall be terminated
as therein  provided and may be terminated  as otherwise  provided in the Merger
Agreement.  In the event of the  termination  of this Plan of Merger as provided
above,  this Plan of Merger  shall  forthwith  become void and there shall be no
liability on the part of any of the parties hereto except as otherwise  provided
in the Merger Agreement.

     Section 3.2  Amendment.  This Plan of Merger shall not be amended except in
accordance with the provisions of Section 9.4 of the Merger Agreement.


                                   ARTICLE IV

                                  MISCELLANEOUS

     Section 4.1  Governing  Law.  This Plan of Merger  shall be governed by the
laws of the State of Delaware.

     Section  4.2  Counterparts.  This Plan of Merger may be  executed in two 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 4.3 Authorized Officers. The chairman of the board, president, vice
president,  secretary  and  assistant  secretary  of  each  of  the  Constituent
Corporations  are each  authorized  by it in its name to execute  and deliver or
cause to be  executed  and  delivered  any  articles of merger,  certificate  of
merger, agreements, certificates,  appointments, or other instruments, and to do
anything  else that he or they deem to be necessary  or desirable in  connection
with the Merger.


                                       -5-

<PAGE>



     IN WITNESS  WHEREOF,  the parties hereto have caused this Plan of Merger to
be signed by their respective  officers thereunto duly authorized as of the date
first written above.

                                     NORTHERN STATES POWER COMPANY



                                     By:
                                     Name:
                                     Title:


                                     NEW CENTURY ENERGIES, INC.



                                     By:
                                     Name:
                                     Title:

                                       -6-

<PAGE>


                                                                         ANNEX I

                                   AMENDMENTS
                                       TO
                     NSP RESTATED ARTICLES OF INCORPORATION
                    TO BE EFFECTIVE AS OF THE EFFECTIVE TIME


     1.  The  first   sentence  of  Article  I  of  the  Restated   Articles  of
Incorporation  of Northern  States Power  Company (the "NSP  Charter")  shall be
amended to read in its entirety as follows:  "The name of this corporation shall
be _________________."

     2. The first  paragraph of Article V of the NSP Charter shall be amended to
read in its entirety as follows:

     "The  total  authorized  number  of  shares  that  may  be  issued  by  the
Corporation  and that the  Corporation  will henceforth be authorized to have is
one billion (1,000,000,000) of the par value per share hereinafter set forth."

     3.  Subparagraph 1 of Article V of the NSP Charter shall be amended to read
in its entirety as follows:

          "1. Authorized Number and Classes of Shares

          Such  shares  shall be  divided  into two  classes  to be  designated,
          respectively,  Preferred Stock and Common Stock.  The total authorized
          number of  shares  of  Preferred  Stock is seven  million  (7,000,000)
          having a par value of one hundred dollars ($100.00) per share, and the
          total  authorized  number of shares  of  Common  Stock is one  billion
          (1,000,000,000)  having a par value of two  dollars  and  fifty  cents
          ($2.50) per share."


                                       -7-

<PAGE>


                                                                       EXHIBIT B


                                   AMENDMENTS
                                       TO
                     NSP RESTATED ARTICLES OF INCORPORATION


     1.  The  first   sentence  of  Article  I  of  the  Restated   Articles  of
Incorporation  of Northern  States Power  Company (the "NSP  Charter")  shall be
amended to read in its entirety as follows:  "The name of this corporation shall
be _________________."

     2. The first  paragraph of Article V of the NSP Charter shall be amended to
read in its entirety as follows:

          "The  total  authorized  number  of  shares  that may be issued by the
          Corporation and that the Corporation  will henceforth be authorized to
          have  is one  billion  (1,000,000,000)  of the  par  value  per  share
          hereinafter set forth."

     3.  Subparagraph 1 of Article V of the NSP Charter shall be amended to read
in its entirety as follows:

          "1. Authorized Number and Classes of Shares

          Such  shares  shall be  divided  into two  classes  to be  designated,
          respectively,  Preferred Stock and Common Stock.  The total authorized
          number of  shares  of  Preferred  Stock is seven  million  (7,000,000)
          having a par value of one hundred dollars ($100.00) per share, and the
          total  authorized  number of shares  of  Common  Stock is one  billion
          (1,000,000,000)  having a par value of two  dollars  and  fifty  cents
          ($2.50) per share."


                                       -1-

<PAGE>

                                                                       EXHIBIT C

                                     [Date]


Northern States Power Company
414 Nicollet Mall, 4th Floor
Minneapolis, Minnesota  55401


Ladies and Gentlemen:

     I have been advised  that as of the date  hereof,  I may be deemed to be an
"affiliate"  of  New  Century  Energies,   Inc.,  a  Delaware  corporation  (the
"Company"),  as such term (i) 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 "Securities  Act"), or (ii) is used in and for purposes
of  Accounting  Series  Releases  130 and 135,  as amended,  of the  Commission.
Pursuant to the terms of the  Agreement and Plan of Merger dated as of March 24,
1999,  as it may be amended,  supplemented  or  modified  from time to time (the
"Merger  Agreement"),  between the Company and Northern States Power Company,  a
Minnesota  corporation  ("NSP"),  the  Company  will be  merged  into  NSP  (the
"Merger").  Capitalized  terms used herein but not defined herein shall have the
meanings ascribed to such terms in the Merger Agreement.

     I further  understand  that it is expected  that the Merger will be treated
for financial accounting purposes as a "pooling of interests" in accordance with
generally  accepted  accounting  principles and that the Staff of the Commission
has issued certain  guidelines that should be followed to ensure that pooling of
interests accounting is available for a business combination transaction.

     In  consideration  of NSP's reliance on this letter in connection  with the
consummation  of the Merger and for other good and valuable  consideration,  the
receipt and sufficiency of which are hereby  acknowledged,  I hereby  represent,
warrant and agree that (i) I will not make any sale,  transfer,  pledge or other
disposition  of any shares of Company  Common  Stock,  par value $1.00 per share
(the  "Company  Common  Stock"),  from  the  date  that is 30 days  prior to the
Effective  Time of the Merger  until the  earlier of the  Effective  Time or the
termination of the Merger  Agreement,  (ii) I will not make any sale,  transfer,
pledge or other  disposition  of NSP Common Stock,  par value $2.50 per share of
(the "NSP Common Stock")  received by me pursuant to the Merger until after such
time as results covering at least 30 days of combined  operations of the Company
and NSP have been published by NSP, in the form of a quarterly  earnings report,
an effective registration statement,  filed with the Commission, a report to the
Commission on Form 10-K, 10-Q or 8-K, or any other public filing or announcement
which includes such combined results of operations (the "Pooling  Period"),  and
(iii) I will not make any sale,  transfer or other  disposition of any shares of
NSP Common  Stock  received  by me pursuant  to the Merger in  violation  of the
Securities Act or the rules and regulations thereunder. I have been advised that
the issuance of the shares of NSP Common Stock pursuant to the Merger will


<PAGE>



have  been  registered  with  the  Commission  under  the  Securities  Act  on a
Registration  Statement  on Form S-4. I have also been  advised,  however,  that
since I may be deemed to be an  affiliate  of the Company at the time the Merger
is submitted for a vote of the shareholders of the Company, the NSP Common Stock
received  by me  may  be  disposed  by me  only  (i)  pursuant  to an  effective
registration  under the Securities  Act, (ii) in conformity  with the volume and
other limitations of Rule 145 promulgated by the Commission under the Securities
Act, or (iii) in reliance upon an exemption from  registration that is available
under the Securities  Act. I understand  that such  exemptions are limited and I
have obtained or will obtain  advice of counsel as to the nature and  conditions
of such exemptions,  including  information with respect to the applicability to
the sale of such  securities  of Rules  144 and  145(d)  promulgated  under  the
Securities Act.

     I also understand that  instructions  will be given to NSP's transfer agent
with respect to the NSP Common Stock to be received by me pursuant to the Merger
and that there will be placed on the  certificates  representing  such shares of
NSP Common Stock, or any substitutes  therefor, a legend stating in substance as
follows:

          "THE SECURITIES  REPRESENTED BY THIS CERTIFICATE HAVE BEEN ISSUED IN A
          TRANSACTION TO WHICH RULE 145 PROMULGATED  UNDER THE SECURITIES ACT OF
          1933,  AS  AMENDED,   APPLIES  AND  MAY  ONLY  BE  SOLD  OR  OTHERWISE
          TRANSFERRED  IN  COMPLIANCE  WITH  THE  REQUIREMENTS  OF  RULE  145 OR
          PURSUANT TO A  REGISTRATION  STATEMENT  UNDER THAT ACT OR AN EXEMPTION
          FROM SUCH REGISTRATION. THE SHARES REPRESENTED BY THIS CERTIFICATE ARE
          ALSO SUBJECT TO ADDITIONAL  RESTRICTIONS  ON TRANSFER  CONTAINED IN AN
          AGREEMENT  BETWEEN THE HOLDER HEREOF AND NORTHERN STATES POWER COMPANY
          ("NSP"), A COPY OF WHICH AGREEMENT IS ON FILE AT THE PRINCIPAL OFFICES
          OF NSP."

     It is understood  and agreed that  following the Pooling  Period the legend
set forth above shall be removed  upon  surrender of  certificates  bearing such
legend by delivery of  substitute  certificates  without  such legend if I shall
have  delivered to NSP an opinion of counsel,  in form and substance  reasonably
satisfactory  to NSP,  to the  effect  that (i) the sale or  disposition  of the
shares  represented  by the  surrendered  certificates  may be effected  without
registration  of the  offering,  sale and  delivery  of such  shares  under  the
Securities  Act,  and (ii)  the  shares  to be so  transferred  may be  publicly
offered,  sold and delivered by the transferee  thereof without  compliance with
the registration provisions of the Securities Act.

     I also  acknowledge and agree that unless a transfer by me of shares of NSP
Common  Stock  received  by  me in  the  Merger  is  pursuant  to  an  effective
registration statement under the Securities Act or in conformity with the volume
and other  limitations  of Rule 145, NSP reserves the right to put the following
legend  on the  certificates  issued to my  transferees,  which  legend  will be
removed by delivery of  substitute  certificates  upon  receipt of an opinion in
form and  substance  reasonably  satisfactory  to NSP from  independent  counsel
reasonably  satisfactory  to NSP to the  effect  that  such  legend is no longer
required for purposes of the Securities Act:


<PAGE>



          "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 MAY NOT BE SOLD,
          PLEDGED OR  OTHERWISE  TRANSFERRED  EXCEPT  PURSUANT  TO AN  EFFECTIVE
          REGISTRATION  STATEMENT  UNDER  THE  SECURITIES  ACT  OF  1933  OR  IN
          ACCORDANCE WITH AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE
          SECURITIES ACT OF 1933."

     I further  understand and agree that NSP is under no obligation to register
the sale,  transfer or other  disposition of the NSP Common Stock by me or on my
behalf under the Securities  Act or to take any other action  necessary in order
to make compliance with an exemption from such registration available.

     Execution of this letter  should not be  considered an admission on my part
that I am an "affiliate"  of the Company as described in the first  paragraph of
this letter, or as a waiver of any rights I may have to object to any claim that
I am such an affiliate on or after the date of this letter.

     This letter agreement  constitutes the complete  understanding  between NSP
and me concerning the subject matter hereof.  Any notice  required to be sent to
either party  hereunder  shall be sent by registered or certified  mail,  return
receipt requested, using the addresses set forth herein or such other address as
shall be  furnished in writing by the parties.  This letter  agreement  shall be
governed by and construed and  interpreted  in accordance  with, the laws of the
State of Delaware.

     If you are in agreement with the  foregoing,  please so indicate by signing
below and returning a copy of this letter to the undersigned, at which time this
letter shall become a binding agreement between us.

                                                     Very truly yours,



                                                     Name


Accepted this ___ days of _________, 200__.

NORTHERN STATES POWER COMPANY


By:
Name:
Title:


<PAGE>


                                                                       EXHIBIT D


                                     [Date]


New Century Energies, Inc.
1125 Seventeenth Street
Denver, Colorado  80202


Ladies and Gentlemen:

     I have been advised  that as of the date  hereof,  I may be deemed to be an
"affiliate" of Northern States Power Company, a Minnesota  corporation  ("NSP"),
as such term (i) is defined for purposes of  paragraphs  (c) and (d) of Rule 145
of the Rules and  Regulations  of the Securities  and Exchange  Commission  (the
"Commission")  under the Securities Act of 1933, as amended,  or (ii) is used in
and for purposes of Accounting  Series Releases 130 and 135, as amended,  of the
Commission.  Pursuant to the terms of the Agreement and Plan of Merger, dated as
of March 24, 1999, as it may be amended,  supplemented and modified from time to
time between NSP and New Century Energies, Inc. ("NCE"), NCE will be merged with
and into NSP (the  "Merger").  Capitalized  terms used  herein  but not  defined
herein shall have the meanings ascribed to such terms in the Merger Agreement.

     I further  understand  that it is expected  that the Merger will be treated
for financial accounting purposes as a "pooling of interests" in accordance with
generally  accepted  accounting  principles and that the Staff of the Commission
has issued certain  guidelines that should be followed to ensure that pooling of
interests accounting is available for a business combination transaction.

     In  consideration  of NCE's reliance on this letter in connection  with the
consummation  of the Merger and for other good and valuable  consideration,  the
receipt and sufficiency of which are hereby  acknowledged,  I hereby  represent,
warrant  and  agree  that I will not make any  sale,  transfer,  pledge or other
disposition  of any shares NSP Common  Stock,  par value  $2.50 per share  ("NSP
Common Stock"), from the date that is 30 days prior to the Effective Time of the
Merger until the earlier of termination of the Merger  Agreement or such time as
results  covering  at least 30 days of combined  operations  of NSP and NCE have
been published by NSP, in the form of a quarterly  earnings report, an effective
registration statement filed with the Commission,  a report to the Commission on
Form  10-K,  10-Q or 8-K,  or any  other  public  filing or  announcement  which
includes such combined results of operations.

     Execution of this letter  should not be  considered an admission on my part
that I am an  "affiliate"  of NSP as  described  in the first  paragraph of this
letter, or as a waiver of any rights I may have to object to any claim that I am
such an affiliate on or after the date of this letter.



<PAGE>


     This letter agreement  constitutes the complete  understanding  between NCE
and me concerning the subject matter hereof.  Any notice  required to be sent to
either party  hereunder  shall be sent by registered or certified  mail,  return
receipt requested, using the addresses set forth herein or such other address as
shall be  furnished in writing by the parties.  This letter  agreement  shall be
governed by and construed and  interpreted  in accordance  with, the laws of the
State of Delaware.

     If you are in agreement with the  foregoing,  please so indicate by signing
below and returning a copy of this letter to the undersigned, at which time this
letter shall become a binding agreement between us.

                                                       Very truly yours,



                                                       Name


Accepted this ___ days of _________, 200__.

NEW CENTURY ENERGIES, INC.


By:
Name:
Title:



                               Joint News Release

[GRAPHIC OMITTED]

 For NCE:                                            For NSP:
 Media Relations:                                    Media Relations:
 (303) 294-8900                                      (612) 337-2167
 Investors:                                          Investors:
 Mike Pritchard                                      Richard Kolkman
 (303) 294-2588                                      (612) 330-6622
 www.ncenergies.com                                  www.nspco.com


For Immediate Release

                 NEW CENTURY ENERGIES AND NORTHERN STATES POWER
                                    TO MERGE

               MERGED COMPANY WELL POSITIONED IN RAPIDLY CHANGING
                               UTILITIES INDUSTRY

DENVER and  MINNEAPOLIS , March 25, 1999 - New Century  Energies  (NYSE:NCE) and
Northern States Power Co. (NYSE:NSP) today announced that they have entered into
a definitive merger agreement.

     "This merger  combines  two  well-managed,  mid-continent  electric and gas
companies in order to provide a strong platform for assuring  low-cost,  quality
service to the region  during a time of rapid  change in the utility  industry,"
said James J. Howard, president, chairman and CEO of Northern States Power Co.

     The merged  company will stretch  from Mexico to the Canadian  border,  and
also will

                                                 - 1 -


<PAGE>



have a strong global  presence,  with operations in the United Kingdom,  Central
Europe, Australia and South America. It will be headquartered in Minneapolis and
certain key business units or operations will be based in Wisconsin,  Denver and
Amarillo, Texas. The company will be named later.

     The merger is  expected  to be a  tax-free,  stock-for-stock  exchange  for
shareholders  of  both  companies,  and  to be  accounted  for as a  pooling  of
interests. NCE and NSP anticipate that the merger will be accretive in the first
full year and thereafter to both sets of  shareholders  assuming  realization of
anticipated net cost savings.  Upon completion,  holders of New Century Energies
stock will receive 1.55 shares of the merged company stock for each share of NCE
stock.  Each share of Northern  States Power stock will continue as one share of
the combined company.

     Howard  said,  "The  merger  prepares  the  combined  company for where the
industry  will be - an  environment  of customer  choice - rather than where the
industry is today. The merger is predicated on providing our customers continued
low-cost,  reliable energy while  maintaining  high levels of customer  service.
This  will be  extremely  important  to  customers  as the  utility  environment
continues to change."

     In addition,  Howard said the combined  companies  are committed to meeting
and exceeding environmental standards.

     Bill D. Helton, chairman and CEO of Denver-based New Century Energies said,
"The merger provides both the combined  company and its operating units with the
scale  necessary  to remain  competitive  in a changing  industry  marketplace."
Helton added that NSP and New Century are an excellent fit. "Our philosophies of
focusing on excellence in customer  service are the same; we both have succeeded
in keeping  our costs  among the  lowest in the  industry;  and our  strategies,
customer  base and utility  operations  are very  similar." He said the combined
company will "integrate two strong companies with similar customer  demographics
within a single region, creating more growth in shareholder value than would the
stand-alone  companies."  The companies said they expect the merger to result in
net cost savings of

                                      - 2 -


<PAGE>



approximately  $1.1 billion in the first 10 years of operations.

     Wayne H. Brunetti,  vice chairman,  president and COO of New Century, said,
"We expect significant cost savings from the elimination of duplicate  programs,
greater purchasing efficiencies and streamlined business processes."

         "The company  intends to honor all existing union  contracts," he said.
"And we can achieve our target merger  savings while still  supporting our local
communities and continuing to offer the same excellent prices and service."

     Howard,  63, will serve as  chairman  of the holding  company for the first
full year of  operations.  Brunetti,  56, will be president and CEO upon closing
and will assume the responsibilities as chairman upon Howard's  retirement.  New
Century Energies' Helton,  60, will retire at the completion of the merger.  The
board will consist of an equal number of members from Northern  States Power and
New Century  Energies.  In the United  States,  the merged  company will serve 3
million  electricity   customers  and  approximately  1.5  million  natural  gas
customers in 12 states including Arizona, Colorado, Kansas, Michigan, Minnesota,
New Mexico, North Dakota, Oklahoma, South Dakota, Texas, Wisconsin, and Wyoming.
Internationally,  the company will serve about 2 million electric  customers and
400,000  natural gas  customers in the United  Kingdom.  Based on year-end  1998
capacity,  as a combined entity, the company will have total generating capacity
of 21,720 megawatts,  of which 15,133 is regulated in the United States. It also
will have 6,587 megawatts of  non-regulated  generation in the United States and
internationally,  including  operations in the United  Kingdom,  Central Europe,
Australia and South America.  Based on 1998 results,  the combined company would
have revenues of $6.4 billion,  earnings of $618.8  million and assets  totaling
approximately   $15.1  billion.   The  merger   requires  the  approval  by  the
shareholders  of the two  existing  holding  companies,  as well as  approval or
regulatory review by the Securities and Exchange Commission,  the Federal Energy
Regulatory Commission,  the Federal Trade Commission, the Department of Justice,
the Federal Communications Commission, the Nuclear Regulatory

                                      - 3 -


<PAGE>



Commission,  and state  regulators in nine of the states currently served by the
two companies. The merger is expected to take from 12 to 18 months to complete.

     It is anticipated the holding  company will adopt the NCE dividend  payment
level, adjusted for the exchange ratio. Based on the exchange ratio of 1.55, the
pro forma  dividend for the merged  company will be $1.50 per share on an annual
basis, following completion of the merger. This maintains the dividend level for
NCE shareholders and provides a slight increase for NSP shareholders.

     Based on the number of common  shares  currently  outstanding,  New Century
Energies  shareholders  will own 54 percent of the common equity of the combined
company and Northern States Power shareholders will own 46 percent.  As of March
15,  New  Century  Energies  had  approximately   114.9  million  common  shares
outstanding,  and NSP had 153.1 million common shares outstanding.  Debt holders
and preferred  stockholders  will continue  with their  present  holdings  under
existing terms.

     SG Barr Devlin  served as financial  advisor to New Century  Energies,  and
Northern States Power was advised by The Blackstone Group.

     New Century Energies serves approximately 1.5 million electricity customers
and more than a million  natural gas customers in Colorado,  Texas,  New Mexico,
Wyoming, Kansas and Oklahoma. Its operating companies include Public Service Co.
of Colorado,  Southwestern  Public Service Co. and Cheyenne Light, Fuel & Power.
Wholly owned subsidiaries  include: New Century  International,  which owns a 50
percent  interest  in  Yorkshire  Electricity  in the  United  Kingdom;  Utility
Engineering,  which provides engineering,  design, construction,  management and
other  related  services to  utilities;  Quixx,  which  invests in and  develops
cogeneration and other energy-related projects;  Planergy, which provides energy
services to commercial and industrial customers; eprime, which is an unregulated
commodity marketing affiliate currently engaged in gas and electricity marketing
and trading.  Northern  States Power  provides  electricity to about 1.5 million
customers in portions of Minnesota,  Wisconsin,  North Dakota,  Michigan,  South
Dakota. It distributes  natural gas to more than 475,000 customers in Minnesota,
Wisconsin, North Dakota, Michigan and Arizona. Wholly owned subsidiaries include
NRG Energy, Inc., which operates and has ownership

                                      - 4 -


<PAGE>



interests  in  non-regulated  energy  businesses  around the  world,  with major
projects in the United States, Germany and Australia. Other subsidiaries include
Viking Gas  Transmission  Company,  a natural gas transmission  company;  Energy
Masters International,  an energy service company;  Seren Innovations,  which is
building  communication  networks to deliver telephone,  cable TV and high-speed
Internet  and data  services  ; and  Eloigne  Company,  which has  interests  in
affordable housing projects.

     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;
economic  conditions  in  the  company's  service  territory;   fluctuations  in
energy-related  commodity  prices,  realization  of net cost savings in a timely
manner,  and other  uncertainties.  Other risk factors are detailed from time to
time in the two companies' SEC reports.


                                      - 5 -


<PAGE>


                            Merger Facts at a Glance

<TABLE>
<CAPTION>

                                               New Century               Northern States                 Combined
                                                Energies                    Power Co.
<S>          <C>                             <C>                         <C> 

             Market value                    $4.446 billion              $4.175 billion               $8.621 billion
           (as of Mar. 24)
            Long-term debt                   $2.206 billion              $1.851 billion               $4.057 billion
           Trust/Preferred                    $294 million               $305.3 million               $599.3 million
       Revenue from electricity              $2.697 billion              $2.352 billion               $5.049 billion
           Revenue from gas                   $841 million                $457 million                $1.298 billion
            Total revenues                   $3.611 billion              $2.819 billion                $6.43 billion
            Total earnings                    $341,957,000                $276,825,000                 $618,782,000
      Earnings per share - basic                  $3.06                       $1.84                         N/A
         Earnings per share -                     $3.05
               diluted
             Total assets                     $7.7 billion                $7.4 billion                 $15.1 billion
        Electricity customers                   1,601,000                   1,459,000                    3,060,000
       (United States-current)
        Electricity customers                   2,080,000                                                2,080,000
           (International)
         Electricity capacity                7,984 megawatts             7,149 megawatts             15,133 megawatts
           (U.S. regulated)
         Electricity capacity                 247 megawatts             6,340 megawatts*             6,587 megawatts*
           (non-regulated)
          Miles of electric                      10,236                       6,843                       17,079
          transmission lines
        Natural gas customers                   1,057,000                    475,000                     1,532,000
        Miles of gas pipelines                   16,063                      10,573                       26,636
              Employees                           6,305                       7,455                       13,760
    Avg. retail electricity rates            5.4 cents/ kwh               5.9 cents/kwh
            States served                   Colorado, Kansas,          Arizona, Michigan,
                                               New Mexico,          Minnesota, South Dakota,
                                            Oklahoma, Texas,         North Dakota, Wisconsin
                                                 Wyoming
</TABLE>


            (Based on 1998 year-end information, except where noted)

*Includes projects operating, under construction, or under contract, expected
 to close by 7/1/99

                                      - 6 -


                                 FIRST AMENDMENT


     THIS FIRST AMENDMENT,  dated as of March 24, 1999, to the Rights Agreement,
dated as of August  1,  1997  (the  "Rights  Agreement"),  between  New  Century
Energies,  Inc. (the  "Company")  and The Bank of New York, as Rights Agent (the
"Rights Agent").

     WHEREAS, the parties hereto are parties to the Rights Agreement.

     WHEREAS,  pursuant  to  Section 27 of the  Rights  Agreement,  the Board of
Directors  deems it necessary  and  desirable  and in the best  interests of the
Company and its  shareholders to amend the Rights  Agreement as set forth below;
and

     WHEREAS,  the  parties  hereto  desire to amend the  Rights  Agreement,  as
provided herein,

     NOW,  THEREFORE,  in  consideration of the premises and the mutual promises
set forth  herein and in the  Rights  Agreement,  the  parties  hereto  agree as
follows:

     1. The definition of "Acquiring Person" as set forth in Section 1(a) of the
Rights Agreement is hereby amended by adding the following  provision at the end
of the first sentence thereto:

     "; provided,  however, that Northern States Power Company ("NSP") shall not
     be deemed an "Acquiring Person" as a result of the execution,  delivery and
     performance  of the Agreement  and Plan of Merger (the "Merger  Agreement")
     dated as of March 24, 1999, between NSP and the Company or the consummation
     of the transactions contemplated in the Merger Agreement".

     2. Clause (a)(i) of Section 7 of the Rights  Agreement is hereby amended to
read in its entirety as follows:

     "the  earlier of the close of business  on July 31, 2007 or the  "Effective
     Time" as defined in Merger Agreement (the "Final Expiration Date")".

     3. Clause (a) of Section 13 of the Rights  Agreement  is hereby  amended by
adding the words "other than pursuant to the Merger Agreement" at the end of the
introductory  phrase "In the event that,  following the Shares Acquisition Date,
directly or indirectly," of such clause.

     4. This Amendment shall be governed by and construed in accordance with the
laws of the State of Delaware  applicable  to contracts to be made and performed
entirely  within such State,  except that the rights,  duties and obligations of
the Rights Agent under this Amendment shall be governed by the laws of the State
of New York.

     5. Except as expressly amended hereby,  the Rights Agreement shall continue
in full force and effect in accordance with the provisions thereof.

                                        1

<PAGE>



     6. This Amendment may be executed in any number of counterparts and each of
such  counterparts  shall for all purposes be deemed to be an original,  and all
such counterparts together constitute but one and the same instrument.

     IN WITNESS  WHEREOF,  the Company and the Rights Agent have  executed  this
First Amendment as of the date first above written.

                                NEW CENTURY ENERGIES, INC.



                                By:           /s/ Bill D. Helton
                                         Name:    Bill D. Helton
                                         Title:   Chief Executive Officer
Attest:


     /s/ Cathy J. Hart
Name:    Cathy J. Hart
Title:   Secretary




                                           THE BANK OF NEW YORK



                                           By:           /s/ Kevin Brennan
                                                    Name:    Kevin Brennan
                                                    Title:   Vice President
Attest:


     /s/ Daniel Egan
Name:    Daniel Egan
Title:   Assistant Vice President

                                        2



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