PUBLIC SERVICE CO OF COLORADO
8-K, 1995-08-23
ELECTRIC & OTHER SERVICES COMBINED
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                        SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C.   20549



                                     FORM 8-K


                                  CURRENT REPORT
                     PURSUANT TO SECTION 13 or 15(d) of the 
                         SECURITIES EXCHANGE ACT OF 1934


        Date of Report  (date of earliest event reported)  August 22, 1995


                        PUBLIC SERVICE COMPANY OF COLORADO
                     ________________________________________
                (exact name of registrant as specified in charter)


                                     Colorado
                               ____________________
                          (State or other jurisdiction 
                                of incorporation)


                  1-3280                              84-0296600
               ________________                    _________________
               (Commission File No.)                (IRS Employer
                                                     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
<PAGE>

   ITEM 5.     Other Events

   Public Service Company of Colorado, a Colorado corporation ("PSC"),
   Southwestern Public Service Company ("SPS"), a New Mexico corporation, and
   M-P New Co., (the "Company" or "Newco"), a newly formed Delaware
   corporation, have entered into an Agreement and Plan of Reorganization,
   dated August 22, 1995, (the "Merger  Agreement") providing for a business
   combination as peer firms involving PSC and SPS in a "merger of equals"
   transaction (the "Merger").  The Merger, which was unanimously approved by
   the Boards of Directors of the constituent companies, is expected to occur
   shortly after all of the conditions to the consummation of the Merger,
   including obtaining applicable regulatory approvals, are met or waived. 
   The regulatory approval process is expected to take approximately 12 to 16
   months.

   The Merger Agreement and the press release issued in connection therewith
   are filed  herewith as exhibits 2 and 99, and are incorporated by
   reference herein.  The description of the Merger Agreement set forth
   herein does not purport to be complete and is qualified in its entirety by
   the provisions of the Merger Agreement.

   As part of the Merger, the holding company of the combined enterprise will
   be registered under the Public Utility Holding Company Act of 1935, as
   amended ("1935 Act").  The Company, which will serve as the holding
   company, will be renamed at a later date and will be the parent company of
   both PSC and SPS.

   Under the terms of the Merger Agreement, New PSC will be merged with and
   into PSC and New SPS will be merged with and into SPS.  PSC and SPS shall
   be the surviving corporations  and shall continue their corporate
   existence under the laws of the State of Colorado and the State of New
   Mexico, respectively.  As a result of the mergers, both PSC and SPS  will
   become subsidiaries of Newco.  Each outstanding share of PSC Common Stock,
   par value $5.00 per share, will be canceled and converted into the right
   to receive 1.00 share(s) of Newco common stock par value $1.00 per share,
   and each outstanding share of SPS Common Stock, par value $1.00 per share, 
   will be canceled and converted into the right to receive 0.95 share(s) of 
   Newco Common Stock.  As of August 4, 1995, PSC had 63.1 million common
   shares outstanding and SPS had 40.9 million common shares outstanding. 
   Based on such capitalization, the Merger would result in the common
   shareholders of PSC owning  61.9% of the common equity of Newco and the
   common shareholders of SPS owning 38.1% of the common equity of  Newco. 
   The Merger Agreement and the Merger will not affect the outstanding debt,
   including mortgage bonds, and shares of preferred stock of PSC and SPS.

   It is anticipated that Newco will adopt  the SPS dividend payment level,
   adjusted for the exchange ratio.  SPS currently pays $2.20 per share
   annually and PSC's current annual dividend  rate is $2.04  per share. 
   Based on the exchange ratio, the proforma dividend for the Company would
   be $2.32 per share on an annual basis, following completion of the Merger. 
   The Company's common stock dividend level will be dependent upon the
   Company's results of operations, financial position, cash flows and other
   factors, and will be evaluated by the Board of Directors.

   The Merger is subject to customary closing conditions, including, without
   limitation, the receipt of required shareholder approvals of PSC and SPS;
   and the receipt of all necessary governmental approvals and the making of
   all necessary governmental filings, including approvals and findings of
   state utility regulators in Colorado, Texas, New Mexico, Oklahoma, Wyoming
   and Kansas and the approval of the Federal Energy Regulatory Commission,
   the Securities and Exchange Commission (the "SEC") under the 1935 Act, 

                                        2
<PAGE>

   the Nuclear Regulatory Commission, and the filing of the requisite
   notification with the Federal Trade Commission and the Department of
   Justice under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
   amended, and the expiration of the applicable waiting period thereunder. 
   The Merger is also subject to the receipt of opinions of counsel that the
   transaction will qualify as a tax-free reorganization, and the assurances
   from the parties' independent accountants that the Merger will qualify as
   a pooling of interests for accounting purposes.  In addition, the Merger
   is conditioned upon the effectiveness of a registration statement to be
   filed with the SEC with respect to the Newco Common Stock to be issued in
   the transaction and the approval for listing of such shares on the New
   York Stock Exchange.  Shareholder meetings to vote upon the Merger will be
   convened as soon as practicable and are expected to be held in the first
   quarter of 1996.

   The Merger Agreement provides that, after the  effectiveness of the
   transaction (the "Effective Time"), the corporate offices of Newco will be
   located in Denver, Colorado with significant operating functions based in
   Amarillo, Texas.   PSC and SPS will maintain their company headquarters in
   Denver and Amarillo, respectively.  Newco's Board of Directors will
   consist of a total of 14 directors, 8 of whom will be designated by PSC
   and 6 of whom will be designated by SPS.  At the Effective Time, Delwin D.
   Hock, Chairman of the Board and Chief Executive Officer ("CEO") of PSC
   will retire. Mr. Bill D. Helton, the current Chairman of the Board and CEO
   of SPS, will serve as CEO of  Newco from the Effective Time until the
   later of (i) June 30, 1999  or (ii) 30 months from the Effective Time and
   will serve as Chairman of the Board of Newco until  May 31, 2001.  Mr.
   Wayne H.  Brunetti, the current President and Chief Operating Officer of
   PSC, will serve as Vice Chairman, President and Chief Operating Officer of
   Newco until the date when Mr. Helton ceases to be CEO, at which time he
   will be entitled to assume the additional role of CEO.  Mr. Brunetti will
   assume the position of Chairman when Mr. Helton ceases to be Chairman. 
   The forms of employment agreements for Mr. Helton and Mr. Brunetti are
   attached as exhibits to the Merger Agreement.

   The Merger Agreement contains certain covenants of the parties pending the
   consummation of the Merger.  Generally, during the interim period until
   consummation, the parties must carry on their businesses in the ordinary
   course consistent with past practice, may not increase dividends on common
   stock beyond specified levels, and may not issue capital stock beyond 
   certain limits.  The Merger Agreement  also contains restrictions on,
   among other things, charter and by-laws amendments, capital expenditures,
   acquisitions, dispositions, incurrence of indebtedness, certain increases
   in employee compensation and benefits, and affiliate transactions.

   The Merger Agreement may be terminated under certain circumstances,
   including (1) by mutual written consent of the Board of Directors of PSC
   and SPS; (2) by PSC or SPS  if the Merger is not consummated on or before
   December 31, 1996 (provided, however, that such termination date shall be
   extended to June 30, 1997 if all conditions to closing the Merger, other
   than the receipt of statutory approvals by any of the parties,  are
   capable of being satisfied by December 31, 1996);  (3) by PSC or SPS if
   approval of either PSC's or SPS's shareholders with respect to the Merger
   is not obtained or if any state or federal  law, rule or regulation or
   court order prohibits the Merger or causes a material adverse effect on
   either PSC or SPS; (4) by a non-breaching party if there exist breaches of
   any representations or warranties contained in the Merger Agreement which,
   individually or in the aggregate, would result in a material adverse
   effect on the breaching party and which are not cured within (20) days
   after notice;  (5) by a non-breaching party if there occur breaches of
   specified covenants or material breaches of any other covenant or

                                        3
<PAGE>

   agreement which are not cured within twenty (20) days after notice; (6) by
   either party if the Board of Directors of the other party shall withdraw
   or adversely modify or fail to reaffirm its recommendation of the Merger;
   or (7) by either party, under certain circumstances, as a result of a
   third-party tender offer or business combination proposal which such
   party's board of directors determines in good faith that their fiduciary
   duties require be accepted (based on counsel's opinion), after the other
   party has first been given an  opportunity to make concessions and
   adjustments in the terms of the Merger Agreement.

   The Merger Agreement provides that if it is terminated pursuant to the
   circumstances described in clause (4), (5) or (6) of the previous
   paragraph, then, if such breach is not willful, the non-breaching or non-
   withdrawing party is entitled to reimbursement of its out-of-pocket
   expenses, not to exceed $10 million.  In the event of a willful breach or
   failure to comply, including under the circumstances described in clause
   (6) of the previous  paragraph, the non-breaching or non-withdrawing party
   will be entitled to its out-of-pocket expenses, (which shall be limited to
   $10 million) and an additional fee equal to $35 million.  In addition, the
   Merger Agreement provides that if such agreement is terminated under the
   circumstances described in clause (7) of the previous paragraph, the party
   accepting the offer shall pay to the other party an amount equal to its
   out-of-pocket expenses, not to exceed $10 million, plus an additional fee
   of $35 million, payable prior to entering into an agreement with a third
   party.  The Merger Agreement also requires payment of a termination fee of
   $35 million (and reimbursement of out-of-pocket expenses, not to exceed
   $10 million) by one party (the "Payor") to the other in certain
   circumstances, if (i) the Merger Agreement is terminated (y) under
   circumstances described in clause (2), (3), (4), (5) or (6) or (z) as a
   result of the Payor's material failure to convene a shareholder meeting,
   distribute proxy materials and, subject to its board of directors'
   fiduciary duties, recommend the Merger to its shareholders; and (ii) at
   the time of such termination or prior to the meeting of such party's
   shareholders there shall have been a third-party tender offer or business
   combination proposal which shall not have been rejected by the Payor and
   withdrawn by such third party.  Such termination fee and out-of-pocket
   expenses referred to in the previous sentence shall be paid upon
   termination.  If the Merger Agreement is terminated as provided in one of
   the first three sentences of this paragraph and if any business
   combination involving the Payor is accepted within one year of termination
   and is consummated within two and one half years from the date of
   acceptance of such business combination, the Payor shall pay to the other
   party an additional fee of $25 million.  All payments made as described in
   this paragraph, except reimbursement for out-of-pocket expenses, shall be
   payable, to the extent not prohibited by law, in shares of common stock of
   the Payor.  The termination fees payable by PSC or SPS under these
   provisions may not exceed $60 million in the aggregate, excluding
   reimbursement of out-of-pocket expenses.

   Based on fiscal 1994 results, the Company  will have combined annual
   revenues of approximately $3 billion and total assets of approximately $6
   billion.  The  companies project a savings of approximately $770 million
   in the first 10 years after the transaction is completed.  The proposed
   allocation of the net savings between ratepayers and shareholders of PSC
   and SPS will be submitted to the  various regulatory agencies later this
   year.

   The Company will serve approximately 1.5 million electric customers in
   Colorado, Texas, New Mexico,  Wyoming, Oklahoma and Kansas and will
   provide natural gas service to 933,000 customers in Colorado and Wyoming. 
   The business of the Company will consist of utility operations and various

                                        4
<PAGE>

   non-utility enterprises, including independent power projects.

   PSC  recognizes that the divestiture of its existing gas operations is a
   possibility under the new registered holding company structure, but will
   seek approval from the SEC to maintain this business.  If divestiture is
   ultimately required, the SEC has historically allowed companies sufficient
   time to accomplish divestitures in a manner that protects shareholder
   value.

   On August 22, 1995, PSC amended (the "Rights Amendment") its Rights
   Agreement (the "Rights Agreement") dated as of February 26, 1991 between
   PSC and Mellon Bank, N.A., as Rights Agent, to provide that Newco 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 Newco and the transactions contemplated by
   the Merger Agreement from the Rights Agreement.  The foregoing description
   of the Rights Amendment is qualified in its entirety by reference to the
   terms of the Rights Amendment, a copy which is attached hereto as Exhibit
   99 (b). 



   ITEM 7.     Financial Statements and Exhibits

   (c)         Exhibits.  The following exhibits are filed herewith:

                     2     Agreement and Plan of Reorganization, dated August
                           22, 1995, by and among Public Service Company of
                           Colorado, Southwestern Public Service Company and
                           M-P New Co.

                     99(a) Press release, dated August 22, 1995, of Public
                           Service Company of Colorado and Southwestern Public
                           Service Company.

                     99(b) Amendment, as of August 22, 1995,  to Rights
                           Agreement dated as of February 26, 1991, between
                           Public Service Company of Colorado and Mellon Bank,
                           N.A.

 
                                        5
<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, thereunto duly authorized.




                                 PUBLIC SERVICE COMPANY OF COLORADO

                                       /s/ R. C. Kelly
                                 -----------------------------------------
                                         R. C. Kelly
                                    Senior Vice President, Finance, 
                                 Treasurer and Chief Financial Officer


   Dated:  August 22, 1995

                                      6
<PAGE>



                                  EXHIBIT INDEX



   2           Agreement and Plan of Reorganization, dated August 22, 1995, by
               and among Public Service Company of Colorado, Southwestern
               Public Service Company and M-P New Co.

   99(a)       Press release, dated August 22, 1995, of Public Service Company
               of Colorado and Southwestern Public Service Company.

   99(b)       Amendment, as of August 22, 1995,  to Rights Agreement dated as
               of February 26, 1991, between Public Service Company of
               Colorado and Mellon Bank, N.A.
<PAGE>






                            AGREEMENT AND PLAN

                            OF REORGANIZATION

                               by and among

                    PUBLIC SERVICE COMPANY OF COLORADO,

                    SOUTHWESTERN PUBLIC SERVICE COMPANY

                                    and

                                 M-P NEW CO.

                         Dated as of August 22, 1995 
<PAGE>

                                TABLE OF CONTENTS

                                                                          Page



                                    ARTICLE I

                                   THE MERGERS

          Section 1.1  Formation of Merger Subsidiaries  . . . . . . . .     2
          Section 1.2  Certain Other Actions . . . . . . . . . . . . . .     2
          Section 1.3  The Mergers . . . . . . . . . . . . . . . . . . .     2
          Section 1.4  Effective Time of the Mergers . . . . . . . . . .     3

                                    ARTICLE II

                               TREATMENT OF SHARES

          Section 2.1  Effect of Mergers on Capital Stock  . . . . . . .     3
          Section 2.2  Exchange of Common Stock Certificates . . . . . .     4

                                   ARTICLE III

                                   THE CLOSING

          Section 3.1  Closing . . . . . . . . . . . . . . . . . . . . .     7

                                    ARTICLE IV

                      REPRESENTATIONS AND WARRANTIES OF PSCo

          Section 4.1  Organization and Qualification  . . . . . . . . .     7
          Section 4.2  Subsidiaries  . . . . . . . . . . . . . . . . . .     8
          Section 4.3  Capitalization  . . . . . . . . . . . . . . . . .     8
          Section 4.4  Authority; Non-Contravention; Statutory
                         Approvals; Compliance . . . . . . . . . . . . .     9
          Section 4.5  Reports and Financial Statements  . . . . . . . .    10
          Section 4.6  Absence of Certain Changes or Events  . . . . . .    11
          Section 4.7  Litigation  . . . . . . . . . . . . . . . . . . .    11
          Section 4.8  Registration Statement and Proxy Statement  . . .    11
          Section 4.9  Tax Matters . . . . . . . . . . . . . . . . . . .    12
          Section 4.10 Employee Matters; ERISA . . . . . . . . . . . . .    15
          Section 4.11 Environmental Protection  . . . . . . . . . . . .    19
          Section 4.12 Regulation as a Utility . . . . . . . . . . . . .    21
          Section 4.13 Vote Required . . . . . . . . . . . . . . . . . .    22
          Section 4.14 Accounting Matters  . . . . . . . . . . . . . . .    22
          Section 4.15 Opinion of Financial Advisor  . . . . . . . . . .    22
          Section 4.16 Insurance . . . . . . . . . . . . . . . . . . . .    22
          Section 4.17 Ownership of SPS Common Stock . . . . . . . . . .    22
          Section 4.18 PSCo Rights Agreement . . . . . . . . . . . . . .    22

                                    ARTICLE V

                      REPRESENTATIONS AND WARRANTIES OF SPS

          Section 5.1  Organization and Qualification  . . . . . . . . .    23
          Section 5.2  Subsidiaries  . . . . . . . . . . . . . . . . . .    23
          Section 5.3  Capitalization  . . . . . . . . . . . . . . . . .    24

                                       -i-
<PAGE>

          Section 5.4  Authority; Non-Contravention; Statutory
                         Approvals; Compliance . . . . . . . . . . . . .    24
          Section 5.5  Reports and Financial Statements  . . . . . . . .    25
          Section 5.6  Absence of Certain Changes or Events  . . . . . .    26
          Section 5.7  Litigation  . . . . . . . . . . . . . . . . . . .    26
          Section 5.8  Registration Statement and Proxy Statement  . . .    26
          Section 5.9  Tax Matters . . . . . . . . . . . . . . . . . . .    27
          Section 5.10 Employee Matters; ERISA . . . . . . . . . . . . .    30
          Section 5.11 Environmental Protection  . . . . . . . . . . . .    34
          Section 5.12 Regulation as a Utility . . . . . . . . . . . . .    35
          Section 5.13 Vote Required . . . . . . . . . . . . . . . . . .    35
          Section 5.14 Accounting Matters  . . . . . . . . . . . . . . .    35
          Section 5.15 Opinion of Financial Advisor  . . . . . . . . . .    35
          Section 5.16 Insurance . . . . . . . . . . . . . . . . . . . .    35
          Section 5.17 Ownership of PSCo Common Stock  . . . . . . . . .    36
          Section 5.18 SPS Rights Agreement  . . . . . . . . . . . . . .    36

                                    ARTICLE VI

                     CONDUCT OF BUSINESS PENDING THE MERGERS

          Section 6.1  Ordinary Course of Business . . . . . . . . . . .    36
          Section 6.2  Dividends . . . . . . . . . . . . . . . . . . . .    37
          Section 6.3  Issuance of Securities  . . . . . . . . . . . . .    37
          Section 6.4  Charter Documents . . . . . . . . . . . . . . . .    37
          Section 6.5  Acquisitions  . . . . . . . . . . . . . . . . . .    38
          Section 6.6  No Dispositions . . . . . . . . . . . . . . . . .    38
          Section 6.7  Indebtedness  . . . . . . . . . . . . . . . . . .    38
          Section 6.8  Capital Expenditures  . . . . . . . . . . . . . .    38
          Section 6.9  Compensation, Benefits  . . . . . . . . . . . . .    39
          Section 6.10 1935 Act  . . . . . . . . . . . . . . . . . . . .    39
          Section 6.11 Accounting  . . . . . . . . . . . . . . . . . . .    39
          Section 6.12 Pooling . . . . . . . . . . . . . . . . . . . . .    39
          Section 6.13 Tax-Free Status . . . . . . . . . . . . . . . . .    40
          Section 6.14 Discharge of Liabilities  . . . . . . . . . . . .    40
          Section 6.15 Cooperation, Notification . . . . . . . . . . . .    40
          Section 6.16 Rate Matters  . . . . . . . . . . . . . . . . . .    40
          Section 6.17 Third-Party Consents  . . . . . . . . . . . . . .    40
          Section 6.18 No Breach, Etc  . . . . . . . . . . . . . . . . .    41
          Section 6.19 Tax-Exempt Status . . . . . . . . . . . . . . . .    41
          Section 6.20 Transition Management . . . . . . . . . . . . . .    41
          Section 6.21 Insurance . . . . . . . . . . . . . . . . . . . .    41
          Section 6.22 Permits . . . . . . . . . . . . . . . . . . . . .    41

                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS

          Section 7.1  Access to Information . . . . . . . . . . . . . .    41
          Section 7.2  Joint Proxy Statement and Registration Statement     42
          Section 7.3  Regulatory Matters  . . . . . . . . . . . . . . .    43
          Section 7.4  Shareholder Approvals . . . . . . . . . . . . . .    44
          Section 7.5  Directors' and Officers' Indemnification  . . . .    44
          Section 7.6  Disclosure Schedules  . . . . . . . . . . . . . .    46
          Section 7.7  Public Announcements  . . . . . . . . . . . . . .    46
          Section 7.8  Rule 145 Affiliates . . . . . . . . . . . . . . .    46
          Section 7.9  Employee Agreements and Workforce Matters . . . .    47
          Section 7.10 Employee Benefit Plans  . . . . . . . . . . . . .    47
          Section 7.11 Incentive, Stock and Other Plans  . . . . . . . .    48

                                       -ii-
<PAGE>

          Section 7.12 No Solicitations  . . . . . . . . . . . . . . . .    48
          Section 7.13 Company Board of Directors  . . . . . . . . . . .    49
          Section 7.14 Company Directors and Officers  . . . . . . . . .    50
          Section 7.15 Employment Contracts  . . . . . . . . . . . . . .    50
          Section 7.16 Corporate Offices . . . . . . . . . . . . . . . .    50
          Section 7.17 Expenses  . . . . . . . . . . . . . . . . . . . .    50
          Section 7.18 Further Assurances  . . . . . . . . . . . . . . .    50
          Section 7.19 Registration Rights . . . . . . . . . . . . . . .    51
          Section 7.20 Charter and By-Law Amendments . . . . . . . . . .    52

                                   ARTICLE VIII

                                    CONDITIONS

          Section 8.1  Conditions to Each Party's Obligation to Effect
                         the Merger to Which it is Party  . . . .  . . .    52
          Section 8.2  Conditions to Obligation of SPS to Effect the SPS
                        Merger . . . . . . . . . . . . . . . . . . . . .    53
          Section 8.3  Conditions to Obligation of PSCo to Effect the
                        PSCo Merger . . .  . . . . . . . . . . . . . . .    54

                                    ARTICLE IX

                        TERMINATION, AMENDMENT AND WAIVER

          Section 9.1  Termination . . . . . . . . . . . . . . . . . . .    55
          Section 9.2  Effect of Termination . . . . . . . . . . . . . .    58
          Section 9.3  Termination Fee; Expenses . . . . . . . . . . . .    58
          Section 9.4  Amendment . . . . . . . . . . . . . . . . . . . .    61
          Section 9.5  Waiver  . . . . . . . . . . . . . . . . . . . . .    61

                                    ARTICLE X

                                GENERAL PROVISIONS

          Section 10.1  Non-Survival of Representations, Warranties,
                          Covenants and Agreements . . . . . . . . . . .    61
          Section 10.2  Brokers  . . . . . . . . . . . . . . . . . . . .    61
          Section 10.3  Notices  . . . . . . . . . . . . . . . . . . . .    62
          Section 10.4  Miscellaneous  . . . . . . . . . . . . . . . . .    62
          Section 10.5  Interpretation . . . . . . . . . . . . . . . . .    63
          Section 10.6  Counterparts; Effect . . . . . . . . . . . . . .    63
          Section 10.7  Parties in Interest  . . . . . . . . . . . . . .    63
          Section 10.8  Specific Performance . . . . . . . . . . . . . .    64



                                      -iii-
<PAGE>

                              INDEX OF DEFINED TERMS

   Term                                                                   Page

   Affiliate Agreement . . . . . . . . . . . . . . . . . . . . . . . . . .  47
   Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
   Applicable Period . . . . . . . . . . . . . . . . . . . . . . . . . . .  63
   Atomic Energy Act . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Business Combination  . . . . . . . . . . . . . . . . . . . . . . . . .  56
   CBCA  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   Certificates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   Closing Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Closing Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   Code  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
   Colorado Commission . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Common Shares Trust . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
   Company Charter Amendments  . . . . . . . . . . . . . . . . . . . . . .  52
   Company Common Stock  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   Company Shares  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Converted Shares  . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Disclosure Schedules  . . . . . . . . . . . . . . . . . . . . . . . . .  46
   Dissenting Holder . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   Effective Time  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   Environmental Claim . . . . . . . . . . . . . . . . . . . . . . . . . .  20
   Environmental Laws  . . . . . . . . . . . . . . . . . . . . . . . . . .  21
   Environmental Permits . . . . . . . . . . . . . . . . . . . . . . . . .  19
   ERISA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
   Excess Shares . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   Exchange Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Exchange Agent  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   FERC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Final Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
   GAAP  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   Governmental Authority  . . . . . . . . . . . . . . . . . . . . . . . .   9
   Hazardous Materials . . . . . . . . . . . . . . . . . . . . . . . . . .  21
   HSR Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
   Indemnified Parties . . . . . . . . . . . . . . . . . . . . . . . . . .  45
   Indemnified Party . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
   IRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Joint Proxy Statement . . . . . . . . . . . . . . . . . . . . . . . . .  12
   Joint Proxy/Registration Statement  . . . . . . . . . . . . . . . . . .  42
   Joint venture . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   Kansas Commission . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
   Merger Agreements . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   Merger Sub A  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   Merger Sub B  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   Merger Subsidiaries . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   Mergers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
   New Mexico Commission . . . . . . . . . . . . . . . . . . . . . . . . .  25
   1935 Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   NMBCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   Non-terminating Party . . . . . . . . . . . . . . . . . . . . . . . . .  58
   NRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   NYSE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   Oklahoma Commission . . . . . . . . . . . . . . . . . . . . . . . . . .  25
   Out-of-Pocket Expenses  . . . . . . . . . . . . . . . . . . . . . . . .  58
   PBGC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

                                       -v-
<PAGE>

   Term                                                                   Page

   Power Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   PSCo  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
   PSCo Benefit Plans  . . . . . . . . . . . . . . . . . . . . . . . . . .  15
   PSCo Common Stock . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   PSCo Conversion Ratio . . . . . . . . . . . . . . . . . . . . . . . . .   3
   PSCo Designee . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
   PSCo Disclosure Schedule  . . . . . . . . . . . . . . . . . . . . . . .  46
   PSCo ERISA Affiliate  . . . . . . . . . . . . . . . . . . . . . . . . .  15
   PSCo Financial Statements . . . . . . . . . . . . . . . . . . . . . . .  11
   PSCo Material Adverse Effect  . . . . . . . . . . . . . . . . . . . . .   7
   PSCo Merger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   PSCo Merger Agreement . . . . . . . . . . . . . . . . . . . . . . . . .   2
   PSCo Preferred Stock  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   PSCo Required Consents  . . . . . . . . . . . . . . . . . . . . . . . .   9
   PSCo Required Statutory Approvals . . . . . . . . . . . . . . . . . . .  10
   PSCo Rights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
   PSCo Rights Agreement . . . . . . . . . . . . . . . . . . . . . . . . .  22
   PSCo SEC Reports  . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   PSCo Shareholders' Approvals  . . . . . . . . . . . . . . . . . . . . .  22
   PSCo Special Meeting  . . . . . . . . . . . . . . . . . . . . . . . . .  44
   Registration Statement  . . . . . . . . . . . . . . . . . . . . . . . .  11
   Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
   Representatives . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
   SEC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Securities Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Shareholder Disapproval . . . . . . . . . . . . . . . . . . . . . . . .  59
   Shares  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
   SPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
   SPS Benefit Plans . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
   SPS Common Stock  . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   SPS Conversion Ratio  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   SPS Designee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
   SPS Disclosure Schedule . . . . . . . . . . . . . . . . . . . . . . . .  46
   SPS ERISA Affiliate . . . . . . . . . . . . . . . . . . . . . . . . . .  30
   SPS Financial Statements  . . . . . . . . . . . . . . . . . . . . . . .  26
   SPS Material Adverse Effect . . . . . . . . . . . . . . . . . . . . . .  23
   SPS Merger  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   SPS Merger Agreement  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   SPS Preferred Stock . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   SPS Required Consents . . . . . . . . . . . . . . . . . . . . . . . . .  24
   SPS Required Statutory Approvals  . . . . . . . . . . . . . . . . . . .  25
   SPS Rights  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
   SPS Rights Agreement  . . . . . . . . . . . . . . . . . . . . . . . . .  36
   SPS SEC Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
   SPS Shareholders' Approval  . . . . . . . . . . . . . . . . . . . . . .  35
   SPS Special Meeting . . . . . . . . . . . . . . . . . . . . . . . . . .  44
   Stock Plan  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
   Subsidiary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   Takeover Proposal . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
   Target Party  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59
   Task Force  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
   Tax Return  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
   Tax Ruling  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
   Texas Commission  . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
   Violation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Wyoming Commission  . . . . . . . . . . . . . . . . . . . . . . . . . .  10


                                       -vi-
<PAGE>

                       AGREEMENT AND PLAN OF REORGANIZATION



               AGREEMENT AND PLAN OF REORGANIZATION, dated as of August 22,
   1995 (this "Agreement"), by and among Public Service Company of Colorado,
   a corporation formed under the laws of the State of Colorado ("PSCo"),
   Southwestern Public Service Company, a corporation formed under the laws
   of the State of New Mexico ("SPS"), and M-P New Co., a corporation formed
   under the laws of the State of Delaware, 50% of whose outstanding capital
   stock is owned by PSCo and 50% of whose capital stock is owned by SPS (the
   "Company").

               WHEREAS, PSCo and SPS have determined to engage in a business
   combination as peer firms in a merger of equals;

               WHEREAS, in furtherance thereof, the respective Boards of
   Directors of PSCo, SPS and the Company have approved the consummation of a
   reorganization provided for in this Agreement, pursuant to which two
   wholly owned, newly formed subsidiaries of the Company will merge with and
   into PSCo and SPS on the terms and conditions set forth in this Agreement
   (such transactions are referred to herein individually as the PSCo Merger
   and the SPS Merger (as defined in Section 1.3) and collectively as the
   "Mergers"), as a result of which the common shareholders of PSCo and SPS
   will together own all of the outstanding shares of common stock of the
   Company and each share of each other class of capital stock of PSCo and
   SPS shall be unaffected and remain outstanding; 

               WHEREAS, for federal income tax purposes, it is intended that
   the Mergers shall collectively qualify as a transaction described in
   Section 351 of the Internal Revenue Code of 1986, as amended (the "Code"),
   and that the shareholders of PSCo and SPS will not recognize any gain or
   loss as a result thereof, except with respect to any cash received; and

               WHEREAS, the parties hereto intend to cause the organization
   of a service company subsidiary of the Company and a subsidiary of the
   Company which will hold the shares of existing non-utility subsidiaries of
   PSCo and SPS.

               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 MERGERS

               Section 1.1  Formation of Merger Subsidiaries.  To effectuate
   the transactions contemplated herein, upon receipt of any required approv-
   als, PSCo and SPS respectively, shall cause the following corporations
   (together, the "Merger Subsidiaries") to be organized:

               (a)   PSCO Merger Corp., a corporation organized under the
   laws of the State of Colorado ("Merger Sub A"), the articles of
   incorporation and bylaws of which shall be in such forms as shall be
   determined by PSCo with the consent of SPS, which consent shall not be
   unreasonably withheld, and the authorized capital stock of which shall
   initially consist of 100 shares of common stock, without par value, which
   shall be issued to the Company at a price of $1.00 per share.

                                        1
<PAGE>

               (b)   SPS Merger Corp., a corporation organized under the laws
   of the State of New Mexico ("Merger Sub B"), the articles of incorporation
   and bylaws of which shall be in such forms as shall be determined by SPS
   with the consent of PSCo, which consent shall not be unreasonably
   withheld, and the authorized capital stock of which shall initially
   consist of 100 shares of common stock, without par value, which shall be
   issued to the Company at a price of $1.00 per share.

               Section 1.2  Certain Other Actions.  In connection with the
   organization of the Merger Subsidiaries, as soon as practicable following
   the creation of the Merger Subsidiaries, the Company shall:  (a) designate
   the respective directors and officers of the Merger Subsidiaries; (b)
   cause the directors and officers of the Merger Subsidiaries to take such
   steps as may be necessary or appropriate to complete the organization of
   the Merger Subsidiaries; (c) adopt (as sole shareholder of each of the
   Merger Subsidiaries) each of the Merger Agreements (as defined in Section
   1.3); (d) cause each Merger Agreement to be approved by the Merger Subsid-
   iary party thereto; and (e) cause each Merger Subsidiary to perform its
   obligations under the Merger Agreement to which it is a party.

               Section 1.3  The Mergers.  Pursuant to agreements and plans of
   merger, forms of which are attached hereto as Exhibit A and Exhibit B
   (respectively, the "PSCo Merger Agreement" and the "SPS Merger Agreement"
   and, together, the "Merger Agreements"), and upon the terms and subject to
   the conditions of this Agreement, at the Effective Time (as defined in
   Section 1.4):

               (a)   Merger Sub A shall be merged with and into PSCo (the
   "PSCo Merger") in accordance with the applicable provisions of the laws of
   the State of Colorado.  PSCo shall be the surviving corporation in the
   PSCo Merger and shall continue its corporate existence under the laws of
   the State of Colorado.  As a result of the PSCo Merger, PSCo shall become
   a subsidiary of the Company.  The effects and consequences of the PSCo
   Merger shall be as set forth in the PSCo Merger Agreement and in Section
   7-111-106 of the Colorado Business Corporation Act (the "CBCA").
               (b)   Merger Sub B shall be merged with and into SPS (the "SPS
   Merger") in accordance with the laws of the State of New Mexico.  SPS
   shall be the surviving corporation in the SPS Merger and shall continue
   its existence under the laws of the State of New Mexico.  As a result of
   the SPS Merger, SPS shall become a subsidiary of the Company.  The effects
   and consequences of the SPS Merger shall be as set forth in the SPS Merger
   Agreement and in Section 53-14-6 of the New Mexico Business Corporation
   Act (the "NMBCA").

               Section 1.4  Effective Time of the Mergers.  On the Closing
   Date (as defined in Section 3.1), articles of merger with respect to the
   PSCo Merger shall be executed and filed by the parties hereto with the
   Department of State of the State of Colorado pursuant to Section 7-111-105
   of the CBCA and articles of merger with respect to the SPS Merger shall be
   executed and filed by the parties hereto with the Department of State of
   the State of New Mexico pursuant to Section 53-14-4 of the NMBCA.  The
   Mergers shall both become effective simultaneously and at the time that
   PSCo and SPS shall agree as specified in the articles of merger for the
   Mergers (the time the Mergers become effective being hereinafter called
   the "Effective Time").


                                    ARTICLE II

                               TREATMENT OF SHARES


                                        2
<PAGE>

               Section 2.1  Effect of Mergers on Capital Stock.  At the
   Effective Time, by virtue of the Mergers and without any action on the
   part of any holder of any capital stock of PSCo, SPS, Merger Sub A, Merger
   Sub B or the Company:

               (a)   Cancellation of Certain Common Stock.  Each share of
   PSCo common stock, par value $5.00 per share ("PSCo Common Stock"), and
   each share of SPS common stock, par value $1.00 per share ("SPS Common
   Stock"), together with any PSCo Rights (as defined in Section 4.18) or SPS
   Rights (as defined in Section 5.18), that are owned by PSCo or any of its
   subsidiaries (as defined in Section 4.1) or by SPS or any of its
   subsidiaries, as the case may be, shall be cancelled and shall cease to
   exist, and no consideration shall be delivered in exchange therefor.

               (b)   Conversion of Certain Common Stock.  Each share of PSCo
   Common Stock issued and outstanding immediately prior to the Effective
   Time (other than shares cancelled pursuant to Section 2.1(a) and shares
   with respect to which the holder thereof duly exercises the right to
   dissent under applicable law) shall be converted into the right to receive
   1.00 share[s] ("PSCo Conversion Ratio") of Company common stock, par value
   $1.00 per share ("Company Common Stock"), and each share of SPS Common
   Stock issued and outstanding immediately prior to the Effective Time
   (other than shares cancelled pursuant to Section 2.1(a) and shares with
   respect to which the holder thereof duly exercises the right to dissent
   under applicable law) shall be converted into the right to receive 0.95
   share[s] ("SPS Conversion Ratio") of Company Common Stock.  Upon such
   conversions as provided for herein and in the respective Merger
   Agreements, each holder of a certificate formerly representing any such
   shares of PSCo Common Stock or SPS Common Stock shall cease to have any
   rights with respect thereto, except the right to receive the shares of
   Company Common Stock to be issued in consideration therefor (and cash in
   lieu of fractional shares) upon the surrender of such certificate in
   accordance with Section 2.2.

               (c)   Cancellation of Company Common Stock.  Each share of
   Company Common Stock issued and outstanding immediately prior to the
   Effective Time shall be cancelled, and no consideration shall be delivered
   in exchange therefor.

               (d)   Preferred Stock Unchanged.  Each of the PSCo Preferred
   Shares, par value $100.00 per share and each share of PSCo Preferred
   Stock, par value $25.00 per share (collectively, "PSCo Preferred Stock"),
   and each share of SPS Preferred Stock, par value $100.00 per share and
   each share of SPS Preferred Stock, par value $25.00 per share
   (collectively, "SPS Preferred Stock") shall be unchanged in and shall
   remain outstanding after the Mergers.

               (e)   Shares of Dissenting Holders.  Any issued and
   outstanding shares of SPS Common Stock, PSCo Common Stock, SPS Preferred
   Stock or PSCo Preferred Stock held by a person who objects to the Merger
   and complies with all applicable provisions of the CBCA or the NMBCA, as
   applicable, concerning the right of such person to dissent from the
   Mergers and demand appraisal of such shares ("Dissenting Holder") shall
   from and after the Effective Time represent only the right to receive such
   consideration as may be determined to be due to such Dissenting Holder
   with respect to such shares pursuant to the CBCA or the NMBCA, as
   applicable, and, in the case of shares of SPS Common Stock and PSCo Common
   Stock, shall not be converted as described in Section 2.1(b); provided,
   however, that shares outstanding immediately prior to the Effective Time
   and held by a Dissenting Holder who shall withdraw the demand for
   appraisal, or lose the right of appraisal of such shares, pursuant to the

                                        3
<PAGE>

   CBCA or the NMBCA, as applicable, shall (i) in the case of shares of SPS
   Common Stock or PSCo Common Stock, be deemed to be converted, as of the
   Effective Time, into the right to receive the Company Common Stock
   specified in Section 2.1(b) and cash in lieu of fractional shares in
   accordance with Section 2.2, without interest, and (ii) in the case of
   shares of SPS Preferred Stock or PSCo Preferred Stock, be unchanged in and
   remain outstanding after the Mergers, without interest.

               Section 2.2  Exchange of Common Stock Certificates.

               (a)   Deposit with Exchange Agent.  As soon as practicable
   after the Effective Time, the Company shall deposit with a bank, trust
   company or other agent selected by PSCo and SPS ("Exchange Agent")
   certificates representing shares of Company Common Stock required to
   effect the conversion of PSCo or SPS, as the case may be, Common Stock
   into Company Common Stock referred to in Section 2.1(b).

               (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 which immediately prior to the Effective
   Time represented issued and outstanding shares of PSCo or SPS, as the case
   may be, Common Stock ("Certificates") that were converted ("Converted
   Shares") into the right to receive shares of Company Common Stock
   ("Company Shares") pursuant to Section 2.1(b), (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
   Company 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, the holder of such
   Certificate shall be entitled to receive in exchange therefor a
   certificate representing that number of whole Company Shares and the
   amount of cash in lieu of fractional share interests 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 Converted Shares which is not
   registered in the transfer records of PSCo or SPS, as the case may be, a
   certificate representing the proper number of Company Shares may be issued
   to a transferee if the Certificate representing such Converted Shares is
   presented to the Exchange Agent, accompanied by all documents required to
   evidence and effect such transfer and by 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
   shall be deemed at any time after the Effective Time to represent only the
   right to receive upon such delivery the certificate representing Company
   Shares and cash in lieu of any fractional shares of Company 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 Company Shares with a record date after the Effective Time
   shall be paid to the holder of any undelivered Certificate with respect to
   the Company 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 a transferee as
   described in Section 2.2(b)) shall have delivered such Certificate 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, there shall be paid to the record holder (or transferee)
   of the certificates representing whole Company Shares issued in exchange
   therefor, without interest, (i) at the time of such delivery, the amount

                                        4
<PAGE>

   of any cash payable in lieu of a fractional share of Company 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
   Company 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 and a payment date subsequent to delivery
   payable with respect to such whole Company Shares, as the case may be.

               (d)   No Fractional Shares.  (i)  No certificates or scrip
   representing fractional shares of Company Common Stock shall be issued
   upon the delivery for exchange of Certificates, and such fractional share
   interests will not entitle the owner thereof to vote or to any rights of a
   shareholder of the Company.

                     (ii)  As promptly as practicable following the Effective
   Time, the Exchange Agent shall determine the excess of (x) the number of
   full shares of Company Common Stock delivered to the Exchange Agent by the
   Company pursuant to Section 2.2(a) over (y) the aggregate number of full
   shares of Company Common Stock to be distributed to holders of PSCo or
   SPS, as the case may be, Common Stock pursuant to Section 2.2(b) (such
   excess being herein called the "Excess Shares").  As soon after the
   Effective Time as practicable, the Exchange Agent, as agent for the
   holders of PSCo or SPS, as the case may be, Common Stock, shall sell the
   Excess Shares at then prevailing prices on the New York Stock Exchange
   ("NYSE"), all in the manner provided in Section 2.2(d)(iii).

                     (iii) The sale of the Excess Shares by the Exchange
   Agent shall be executed on the NYSE through one or more member firms of
   the NYSE and shall be executed in round lots to the extent practicable. 
   Until the proceeds of such sale or sales have been distributed to the
   holders of PSCo or SPS, as the case may be, Common Stock, the Exchange
   Agent shall, until remitted pursuant to Section 2.2(f), hold such proceeds
   in trust for the holders of PSCo or SPS, as the case may be, Common Stock
   ("Common Shares Trust").  The Company shall pay all commissions, transfer
   taxes and other out-of-pocket transaction costs, including the expenses
   and compensation, of the Exchange Agent incurred in connection with such
   sale of the Excess Shares.  The Exchange Agent shall determine the portion
   of the proceeds comprising the Common Shares Trust to which each holder of
   PSCo or SPS, as the case may be, Common Stock shall be entitled, if any,
   by multiplying the amount of the aggregate proceeds comprising the Common
   Shares Trust by a fraction the numerator of which is the amount of the
   fractional share interest to which such holder of PSCo or SPS, as the case
   may be, Common Stock is entitled and the denominator of which is the
   aggregate amount of fractional share interests to which all holders of
   PSCo or SPS, as the case may be, Common Stock are entitled.

                     (iv)  As soon as practicable after the sale of Excess
   Shares pursuant to clause (iii) above and the determination of the amount
   of cash, if any, to be paid to holders of PSCo or SPS, as the case may be,
   Common Stock in lieu of any fractional share interests, the Exchange Agent
   shall distribute such amounts to holders of PSCo or SPS, as the case may
   be, Common Stock who have theretofore delivered Certificates for PSCo or
   SPS, as the case may be, Common Stock for exchange pursuant to this
   Article II.

               (e)   Closing of Transfer Books.  From and after the Effective
   Time, the stock transfer books of PSCo with respect to shares of PSCo
   Common Stock, and of SPS with respect to shares of SPS 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

                                        5
<PAGE>

   Effective Time, Certificates are presented to the Company, they shall be
   cancelled and exchanged for certificates representing the appropriate
   number of whole Company Shares and cash in lieu of fractional shares of
   Company Common Stock as provided in this Section 2.2.

               (f)   Termination of Exchange Agent.  Any certificates
   representing Company Shares deposited with the Exchange Agent pursuant to
   Section 2.2(a) and not exchanged within one year after the Effective Time
   pursuant to this Section 2.2 shall be returned by the Exchange Agent to
   the Company, which shall thereafter act as Exchange Agent.  All funds held
   by the Exchange Agent for payment to the holders of undelivered
   Certificates and unclaimed at the end of one year from the Effective Time
   shall be remitted to the Company, after which time any holder of un-
   delivered Certificates shall look as a general creditor only to the
   Company for payment of such funds to which such holder may be due, subject
   to applicable law.  The Company 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.


                                   ARTICLE III

                                   THE CLOSING

               Section 3.1  Closing.  The closing (the "Closing") of the
   Mergers shall take place at a place to 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 SPS and PSCo shall mutually agree (the "Closing Date").


                                    ARTICLE IV

                      REPRESENTATIONS AND WARRANTIES OF PSCo

               PSCo represents and warrants to SPS as follows:

               Section 4.1  Organization and Qualification.  Except as
   disclosed in Section 4.1 of the PSCo Disclosure Schedule (as defined in
   Section 7.6(ii)), each of PSCo and each of its subsidiaries is a
   corporation duly organized, validly existing and in good standing under
   the laws of its jurisdiction of incorporation, has all requisite corporate
   power and authority, and has been duly authorized by all necessary
   regulatory approvals and orders, to own, lease and operate its assets and
   properties and to carry on its business as it is now being conducted, and
   is duly qualified and in good standing to do business in each jurisdiction
   in which the nature of its business or the ownership or leasing of its
   assets and properties makes such qualification necessary other than in
   such jurisdictions where the failure to be so qualified and in good
   standing will not, when taken together with all other such failures, have
   a material adverse effect on the business, operations, properties, assets,
   condition (financial or otherwise), prospects or results of operations of
   PSCo and its subsidiaries taken as a whole or on the consummation of this
   Agreement or the PSCo Merger Agreement (any such material adverse effect
   being hereinafter referred to as a "PSCo Material Adverse Effect").  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

                                        6
<PAGE>

   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 PSCo Disclosure
   Schedule contains a description as of the date hereof of all subsidiaries
   and joint ventures of PSCo, 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 and
   PSCo's interest therein.  Except as disclosed in Section 4.2 of the PSCo
   Disclosure Schedule, none of such entities is a "public utility company",
   a "holding company", a "subsidiary company" or an "affiliate" of any
   public utility company within the meaning of Section 2(a)(5), 2(a)(7),
   2(a)(8) or 2(a)(11) of the Public Utility Holding Company Act of 1935, as
   amended (the "1935 Act"), respectively.  Except as disclosed in Section
   4.2 of the PSCo Disclosure Schedule, all of the issued and outstanding
   shares of capital stock of each subsidiary of PSCo are validly issued,
   fully paid, nonassessable and free of preemptive rights and are owned
   directly or indirectly by PSCo free and clear of any liens, claims,
   encumbrances, security interests, equities, charges and options of any
   nature whatsoever, and there are no outstanding subscriptions, options,
   calls, contracts, voting trusts, proxies or other commitments,
   understandings, restrictions, arrangements, rights or warrants, including
   any right of conversion or exchange under any outstanding security,
   instrument or other agreement, obligating any such subsidiary to issue,
   deliver or sell, or cause to be issued, delivered or sold, additional
   shares of its capital stock or obligating it to grant, extend or enter
   into any such agreement or commitment.  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.

               Section 4.3  Capitalization.  The authorized capital stock of
   PSCo consists of 140,000,000 shares of PSCo Common Stock and 7,000,000
   shares of PSCo Preferred Stock.  As of the close of business on July 31,
   1995, 62,931,908 shares of PSCo Common Stock and 2,902,412 shares of PSCo
   Preferred Stock were issued and outstanding.  All of the issued and
   outstanding shares of the capital stock of PSCo are validly issued, fully
   paid, nonassessable and free of preemptive rights.  Except as disclosed in
   Section 4.3 of the PSCo Disclosure Schedule and except for the PSCo Rights
   (as defined in Section 4.18), 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 PSCo
   or any of its subsidiaries to issue, deliver or sell, or cause to be
   issued, delivered or sold, additional shares of the capital stock or other
   voting securities of PSCo or obligating PSCo or any of its subsidiaries to
   grant, extend or enter into any such agreement or commitment.

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

               (a)   Authority.  PSCo has all requisite power and authority
   to enter into this Agreement and the PSCo Merger Agreement and, subject to
   the PSCo Shareholders' Approvals (as defined in Section 4.13) and the PSCo
   Required Statutory Approvals (as defined in Section 4.4(c)), to consummate

                                        7
<PAGE>

   the transactions contemplated hereby and thereby.  The execution and
   delivery of this Agreement and the PSCo Merger Agreement and the
   consummation by PSCo of the transactions contemplated hereby and thereby
   have been duly authorized by all necessary corporate action on the part of
   PSCo, subject to obtaining the PSCo Shareholders' Approvals.  This
   Agreement has been, and the PSCo Merger Agreement will be, duly and
   validly executed and delivered by PSCo and, assuming the due
   authorization, execution and delivery of this Agreement by SPS and the
   Company and of the PSCo Merger Agreement by Merger Sub A, constitutes, or
   will constitute, the legal, valid and binding obligation of PSCo
   enforceable against PSCo in accordance with its terms.

               (b)   Non-Contravention.  Except as disclosed in Section
   4.4(b) of the PSCo Disclosure Schedule, the execution and delivery of this
   Agreement by PSCo do not, and the execution and delivery by PSCo of the
   PSCo Merger Agreement and the consummation of the transactions
   contemplated hereby and thereby 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 obligation under or the
   loss of a material benefit under, or result in the creation of any lien,
   security interest, charge or encumbrance upon any of the properties or
   assets (any such violation, conflict, breach, default, right of
   termination, cancellation or acceleration, loss or creation, a
   "Violation") of PSCo or any of its subsidiaries or, to the best knowledge
   of PSCo, any of its joint ventures, under any provisions of (i) the
   articles of incorporation, bylaws or similar governing documents of PSCo
   or any of its subsidiaries or joint ventures, (ii) subject to obtaining
   the PSCo Required Statutory Approvals and the receipt of the PSCo
   Shareholders' Approvals, 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 PSCo or any of its subsidiaries or joint
   ventures or any of their respective properties or assets or (iii) subject
   to obtaining the third-party consents or other approvals set forth in
   Section 4.4(b) of the PSCo Disclosure Schedule (the "PSCo 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 PSCo 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 PSCo Material Adverse Effect.

               (c)   Statutory Approvals.  Except as disclosed in Section
   4.4(c) of the PSCo Disclosure Schedule, 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 PSCo Merger Agreement by PSCo or the
   consummation by PSCo of the transactions contemplated hereby or thereby,
   the failure to obtain, make or give which would have, in the aggregate, a
   PSCo Material Adverse Effect (the "PSCo Required Statutory Approvals"), it
   being understood that references in this Agreement to "obtaining" such
   PSCo 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.


                                        8
<PAGE>

               (d)   Compliance.  Except as disclosed in Section 4.4(d) or
   4.11 of the PSCo Disclosure Schedule or as disclosed in the PSCo SEC
   Reports (as defined in Section 4.5), neither PSCo nor any of its
   subsidiaries nor, to the best knowledge of PSCo, any of its 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 applicable Environmental Laws (as defined in Section
   4.11(g)) of any Governmental Authority, except for violations that, in the
   aggregate, do not have, and, to the best knowledge of PSCo, are not
   reasonably likely to have, a PSCo Material Adverse Effect.  Except as
   disclosed in Section 4.4(d) or 4.11 of the PSCo Disclosure Schedule, PSCo,
   its subsidiaries and, to the best knowledge of PSCo, its 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 the failure to obtain which, in the aggregate, would not have
   a PSCo Material Adverse Effect.

               Section 4.5  Reports and Financial Statements.  The filings
   required to be made by PSCo and its subsidiaries since January 1, 1990
   under the Securities Act of 1933, as amended (the "Securities Act"), the
   Securities Exchange Act of 1934, as amended (the "Exchange Act"),
   applicable Colorado and Wyoming laws and regulations, the Federal Power
   Act (the "Power Act"), the Natural Gas Act, the 1935 Act or the Atomic
   Energy Act of 1954, as amended (the "Atomic Energy Act") have been filed
   with the Securities and Exchange Commission (the "SEC"), the Colorado
   Public Utility Commission (the "Colorado Commission"), the Wyoming Public
   Service Commission (the "Wyoming Commission"), the Federal Energy
   Regulatory Commission (the "FERC") or the Nuclear Regulatory Commission
   (the "NRC"), 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.  PSCo has made available to SPS a true and
   complete copy of each report, schedule, registration statement and
   definitive proxy statement filed by PSCo with the SEC since
   January 1, 1990 and through the date hereof (as such documents have since
   the time of their filing been amended, the "PSCo SEC Reports").  The PSCo
   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 PSCo with the SEC after the date hereof, did not
   and will not contain any untrue statement of a material fact or omit to
   state a material fact required to be stated therein or necessary to make
   the statements therein, in light of the circumstances under which they
   were made, not misleading.  The audited consolidated financial statements
   and unaudited interim financial statements of PSCo included in the PSCo
   SEC Reports (collectively, the "PSCo Financial Statements") have been
   prepared, and will be prepared, in accordance with generally accepted
   accounting principles applied on a consistent basis ("GAAP") (except as
   may be indicated therein or in the notes thereto and except with respect
   to unaudited statements as permitted by Form 10-Q) and fairly present the
   consolidated financial position of PSCo 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.  True, accurate and complete copies of the articles of
   incorporation and bylaws of PSCo, as in effect on the date hereof, have
   been delivered to SPS.

                                        9
<PAGE>

               Section 4.6  Absence of Certain Changes or Events.  Except as
   disclosed in the PSCo SEC Reports filed prior to the date hereof or as
   disclosed in Section 4.6 of the PSCo Disclosure Schedule, from December
   31, 1994 through the date hereof each of PSCo and each of its subsidiaries
   has conducted its business 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, to the best knowledge of
   PSCo, is reasonably likely to have, a PSCo Material Adverse Effect.  For
   purposes of this Section 4.6, the amount of any fine or penalty imposed or
   assessed against PSCo after the date of this Agreement may be taken into
   account in determining whether a PSCo Material Adverse Effect has occurred
   regardless of whether or not the event, fact or condition which lead to
   the imposition or assessment of the fine or penalty has been disclosed in
   the PSCo SEC Reports or the PSCo Disclosure Schedule.

               Section 4.7  Litigation.  Except as disclosed in the PSCo SEC
   Reports filed prior to the date hereof or as disclosed in Section 4.7, 4.9
   or 4.11 of the PSCo Disclosure Schedule, (i) there are no claims, suits,
   actions or proceedings pending or, to the best knowledge of PSCo,
   threatened, nor are there any investigations or reviews pending or, to the
   best knowledge of PSCo, threatened against, relating to or affecting PSCo
   or any of its subsidiaries, (ii) there have not been any developments
   since December 31, 1994 with respect to any such disclosed claims, suits,
   actions, proceedings, investigations or reviews and (iii) there are no
   judgments, decrees, injunctions, rules or orders of any court,
   governmental department, commission, agency, instrumentality or authority
   or any arbitrator applicable to PSCo or any of its subsidiaries that in
   the aggregate would have, or to the best knowledge of PSCo are reasonably
   likely to have, a PSCo 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 PSCo for
   inclusion or incorporation by reference in (i) the registration statement
   on Form S-4 to be filed with the SEC by the Company in connection with the
   issuance of shares of Company Common Stock in the Merger (the
   "Registration Statement") will, at the time the Registration Statement
   becomes effective under the Securities Act, contain any untrue statement
   of a material fact or omit to state any material fact required to be
   stated therein or necessary to make the statements therein not misleading
   and (ii) the joint proxy in definitive form, relating to the meetings of
   the shareholders of SPS and PSCo to be held in connection with the Mergers
   and the prospectus relating to the Company Common Stock to be issued in
   the Mergers (the "Joint Proxy Statement") will, at the date 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 are made, not
   misleading.  The Registration Statement and the Joint Proxy Statement 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, charges, fees,
   levies, or other assessments, including all net income, gross income,
   sales and use, ad valorem, transfer, gains, profits, excise, franchise,
   real and personal property, gross 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

                                        10
<PAGE>

   expenses incurred in connection with the determination, settlement or
   litigation of any tax liability.  "Tax Return", as used in this Agreement,
   means a report, return or other information required to be supplied to a
   governmental entity with respect to Taxes including, where permitted or
   required, combined or consolidated returns for any group of entities that
   includes PSCo or any of its subsidiaries on the one hand, or SPS or any of
   its subsidiaries on the other hand.

               (a)   Filing of Timely Tax Returns.  Except as disclosed in
   Section 4.9(a) of the PSCo Disclosure Schedule, PSCo and each of its
   subsidiaries have filed all Tax Returns required to be filed by each of
   them under applicable law.  All Tax Returns were in all material respects
   (and, as to Tax Returns not filed as of the date hereof, will be) true,
   complete and correct and filed on a timely basis.

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

               (c)   Tax Reserves.  PSCo and its subsidiaries have
   established (and until the Closing Date will maintain) on their books and
   records reserves adequate to pay all Taxes and reserves for deferred
   income taxes in accordance with GAAP.

               (d)   Tax Liens.  There are no Tax liens upon the assets of
   PSCo or any of its subsidiaries except liens for Taxes not yet due.

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

               (f)   Extensions of Time for Filing Tax Returns.  Except as
   disclosed in Section 4.9(f) of the PSCo Disclosure Schedule, neither PSCo
   nor any of its subsidiaries has requested any extension of time within
   which to file any Tax Return, which Tax Return has not since been filed.

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

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

               (i)   Audit, Administrative and Court Proceedings.  Except as
   disclosed in Section 4.9(i) of the PSCo Disclosure Schedule, no audits or

                                        11
<PAGE>

   other administrative proceedings or court proceedings are presently
   pending with regard to any Taxes or Tax Returns of PSCo or any of its
   subsidiaries.

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

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

               (l)   Availability of Tax Returns.  PSCo and its subsidiaries
   have made available to SPS complete and accurate copies, covering all
   years ending on or after December 31, 1990, of (i) all Tax Returns, and
   any amendments thereto, filed by PSCo or any of its subsidiaries, (ii) all
   audit reports received from any taxing authority relating to any Tax
   Return filed by PSCo or any of its subsidiaries and (iii) any Closing
   Agreements entered into by PSCo or any of its subsidiaries with any taxing
   authority.

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

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

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

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

               (q)   Code sections 6661 and 6662.  Except as disclosed in
   Section 4.9(q) of the PSCo Disclosure Schedule, all transactions that
   could give rise to an understatement of federal income tax (within the
   meaning of Code section 6661 for Tax Returns filed on or before December
   31, 1989, and within the meaning of Code section 6662 for tax returns

                                        12
<PAGE>

   filed after December 31, 1989) that could reasonably be expected to result
   in a PSCo Material Adverse Effect have been adequately disclosed (or, with
   respect to Tax Returns filed following the Closing, will be adequately
   disclosed) on the Tax Returns of PSCo and its subsidiaries in accordance
   with Code section 6661(b)(2)(B) for Tax Returns filed on or prior to
   December 31, 1989, and in accordance with Code section 6662(d)(2)(B) for
   Tax Returns filed after December 31, 1989.

               (r)   Code section 280G.  Except as disclosed in Section
   4.9(r) of the PSCo Disclosure Schedule, neither PSCo nor any of its
   subsidiaries is a party to any agreement, contract, or arrangement that
   could reasonably be expected to result, on account of the transactions
   contemplated hereunder, separately or in the aggregate, in the payment of
   any "excess parachute payment" within the meaning of Code section 280G.

               (s)   NOLS.  As of December 31, 1993, PSCo and its
   subsidiaries had net operating loss carryovers available to offset future
   income as disclosed in Section 4.9(s) of the PSCo Disclosure Schedule. 
   Section 4.9(s) of the PSCo Disclosure Schedule discloses the amount of and
   year of expiration of each company's net operating loss carryovers.

               (t)   Credit Carryover.  As of December 31, 1993, PSCo and its
   subsidiaries had tax credit carryovers available to offset future tax
   liability as disclosed in Section 4.9(t) of the PSCo Disclosure Schedule. 
   Section 4.9(t) of the PSCo Disclosure Schedule discloses the amount and
   year of expiration of each company's tax credit carryovers.

               (u)   Code section 338 Elections.  Except as disclosed in
   Section 4.9(u) of the PSCo Disclosure Schedule, no election under Code
   section 338 (or any predecessor provision) has been made by or with
   respect to PSCo or any of its subsidiaries or any of their respective
   assets or properties.

               (v)   Acquisition Indebtedness.  Except as disclosed in
   Section 4.9(v) of the PSCo Disclosure Schedule, no indebtedness of PSCo or
   any of its subsidiaries is "corporate acquisition indebtedness" within the
   meaning of Code section 279(b).

               (w)   Intercompany Transactions.  Except as disclosed in
   Section 4.9(w) of the PSCo Disclosure Schedule, neither PSCo nor any of
   its subsidiaries have engaged in any intercompany transactions within the
   meaning of Treasury Regulations section 1.1502-13 for which any income or
   gain will remain unrecognized as of the close of the last taxable year
   prior to the Closing Date.

               Section 4.10 Employee Matters; ERISA.

               (a)   Benefit Plans.  Section 4.10(a) of the PSCo Disclosure
   Schedule contains a true and complete list of:  (i) each employee benefit
   plan, program or arrangement covering employees, former employees or
   directors of PSCo (or any of its subsidiaries) or any of their dependents
   or beneficiaries, or providing benefits to such persons in respect of
   services provided to any such entity, including, but not limited to, any
   "employee benefit plan" within the meaning of Section 3(3) of the Employee
   Retirement Income Security Act of 1974, as amended ("ERISA") (whether or
   not terminated, if PSCo or any of its subsidiaries could have statutory or
   contractual liability with respect thereto on or after the date hereof);
   (ii) each management, employment, deferred compensation, severance
   (including any payment, right or benefit resulting from a change in
   control), bonus or other contract for personal services with or covering
   any current officer, key employee or director or any consulting contract

                                        13
<PAGE>

   with any person who prior to entering into such contract was a director or
   officer of PSCo or any of its subsidiaries (whether or not terminated, if
   PSCo or any of its subsidiaries could have statutory or contractual
   liability with respect thereto on or after the date hereof); (iii) each
   "employee pension benefit plan" (within the meaning of ERISA section 3(2))
   subject to Title IV of ERISA or the minimum funding requirements of Code
   section 412 maintained or contributed to by PSCo or any entity required to
   be aggregated therewith pursuant to Code section 414(b) or (c) (a "PSCo
   ERISA Affiliate") at any time during the seven-year period immediately
   preceding the date hereof (collectively, the "PSCo Benefit Plans") and
   (iv) with respect to each PSCo Benefit Plan, the source or sources of
   benefit payments under the plan (including, where applicable, the identity
   of any trust (whether or not a grantor trust), insurance contract,
   custodial account, agency agreement, or other arrangement that holds the
   assets of, or serves as a funding vehicle or source of benefits for, such
   PSCo Benefit Plan).

               (b)   Contributions.  Except as disclosed in Section 4.10(b)
   of the PSCo Disclosure Schedule, all material contributions and other
   payments required to have been made by PSCo or any of its subsidiaries
   pursuant to any PSCo Benefit Plan (or to any person pursuant to the terms
   thereof) have been timely made or the amount of such payment or
   contribution obligation has been reflected in the PSCo Financial
   Statements.

               (c)   Qualification; Compliance.  Except as disclosed in
   Section 4.10(c) of the PSCo Disclosure Schedule, each PSCo Benefit Plan
   that is intended to be "qualified" within the meaning of Code
   section 401(a) has been determined by the IRS to be so qualified, and, to
   the best knowledge of PSCo, no event or condition exists or has occurred
   that could reasonably be expected to result in the revocation of any such
   determination.  PSCo and each of its subsidiaries are in compliance with,
   and each PSCo Benefit Plan is and has been operated in compliance with,
   all applicable laws, rules and regulations governing such plan, including,
   without limitation, ERISA and the Code, except for violations that could
   not reasonably be expected to have a PSCo Material Adverse Effect.  To the
   best knowledge of PSCo, no individual or entity has engaged in any
   transaction with respect to any PSCo Benefit Plan as a result of which
   PSCo or any of its subsidiaries could reasonably expect to be subject to
   liability pursuant to ERISA section 409 or section 502, or subject to an
   excise tax pursuant to Code section 4975.  To the best knowledge of PSCo,
   (i) no PSCo Benefit Plan is subject to any ongoing audit, investigation,
   or other administrative proceeding of the Internal Revenue Service, the
   Department of Labor, or any other federal, state, or local governmental
   entity, and (ii) no PSCo Benefit Plan is the subject of any pending
   application for administrative relief under any voluntary compliance
   program of any governmental entity (including, without limitation, the
   IRS's Voluntary Compliance Resolution Program or Walk-in Closing Agreement
   Program, or the Department of Labor's Delinquent Filer Voluntary
   Compliance Program).

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

                                        14
<PAGE>

   claims and funding obligations payable in the ordinary course and
   liability for PBGC insurance premiums payable in the ordinary course,
   could reasonably be expected to have a PSCo Material Adverse Effect.

               (e)   Welfare Plans.  Except as disclosed in Section 4.10(e)
   of the PSCo Disclosure Schedule, no PSCo Benefit Plan that is a "welfare
   plan" (within the meaning of ERISA section 3(1)) provides benefits for any
   retired or former employees (other than as required pursuant to ERISA
   section 601).

               (f)   Documents Made Available.  PSCo has made available to
   SPS a true and correct copy of each collective bargaining agreement to
   which PSCo is a party or under which PSCo has obligations and, with
   respect to each PSCo Benefit Plan, as applicable (i) the current plan
   document (including all amendments adopted since the most recent
   restatement) and its most recently prepared summary plan description and
   all summaries of material modifications prepared since the most recent
   summary plan description, (ii) the most recently prepared annual report
   (IRS Form 5500 Series) including financial statements, (iii) each related
   trust agreement, insurance contract, service provider or investment
   management agreement (including all amendments to each such document),
   (iv) the most recent IRS determination letter with respect to the
   qualified status under Code section 401(a) of such plan and a copy of any
   application for an IRS determination letter filed since the most recent
   IRS determination letter was issued, and (v) the most recent actuarial
   report or valuation.

               (g)   Payments Resulting from Mergers.  Other than as set
   forth in Section 7.11 or disclosed in Section 4.10(g) of the PSCo
   Disclosure Schedule, the consummation or announcement of any transaction
   contemplated by this Agreement will not (either alone or upon the
   occurrence of any additional or further acts or events) result in any (i)
   payment (whether of severance pay or otherwise) becoming due from the
   Company or PSCo or any of its subsidiaries under any applicable PSCo
   Benefit Plans to any officer, employee, former employee or director
   thereof or to the trustee under any "rabbi trust" or similar arrangement,
   or (ii) benefit under any PSCo Benefit Plan being established or becoming
   accelerated, vested or payable, except for a payment or benefit that would
   have been payable under the same terms and conditions without regard to
   the transactions contemplated by this Agreement.

               (h)   Funded Status of Plans.  Except as disclosed in Section
   4.10(h) of the PSCo Disclosure Schedule, each PSCo Benefit Plan that is
   subject to either or both of the minimum funding requirements of ERISA
   section 302 or to Title IV of ERISA has assets that, as of the date
   hereof, have a fair market value equal to or exceeding the present value
   of the accrued benefit obligations thereunder on a termination basis, as
   of the date hereof based on the actuarial methods, tables and assumptions
   theretofore utilized by such plan's actuary in preparing such plan's most
   recently prepared actuarial valuation report, except to the extent that
   applicable law would require the use of different actuarial assumptions if
   such plan was to be terminated as of the date hereof.  No PSCo Benefit
   Plan subject to the minimum funding requirements of ERISA section 302 has
   incurred any "accumulated funding deficiency" (within the meaning of ERISA
   section 302).

               (i)   Multiemployer Plans.  Except as disclosed in
   Section 4.10(i) of the PSCo Disclosure Schedule, no PSCo Benefit Plan is
   or was a "multiemployer plan" (within the meaning of ERISA
   section 4001(a)(3)), a multiple employer plan described in Code section
   413(c), or a "multiple employer welfare arrangement" (within the meaning

                                        15
<PAGE>

   of ERISA section 3(40)); and none of PSCo, any subsidiary thereof or any
   PSCo ERISA Affiliate has been obligated to contribute to, or otherwise has
   or has had any liability with respect to, any multiemployer plan, multiple
   employer plan, or multiple employer welfare arrangement.  With respect to
   any PSCo Benefit Plan that is listed in Section 4.10(i) of the PSCo
   Disclosure Schedule as a multiemployer plan, PSCo and its subsidiaries
   have not made or incurred a "complete withdrawal" or a "partial
   withdrawal," as such terms are defined in ERISA sections 4203 and 4205,
   therefrom at any time during the five calendar year period immediately
   preceding the date of this Agreement and the transactions contemplated by
   the Agreement will not, in and of themselves, give rise to such a
   "complete withdrawal" or "partial withdrawal."

               (j)   Modification or Termination of Plans.  Except as
   disclosed in Section 4.10(j) of the PSCo Disclosure Schedule:  (i) neither
   PSCo nor any subsidiary of PSCo is subject to any legal, contractual,
   equitable or other obligation to establish as of any date any employee
   benefit plan of any nature, including (without limitation) any pension,
   profit sharing, welfare, post-retirement welfare, stock option, stock or
   cash award, non-qualified deferred compensation or executive compensation
   plan, policy or practice; and (ii) to the best knowledge of PSCo, after
   review of all PSCo Benefit Plan documents, the Company, PSCo or one or
   more of its subsidiaries may, in any manner, and without the consent of
   any employee, beneficiary or dependent, employees' organization or other
   person, terminate, modify or amend any PSCo Benefit Plan or any other
   employee benefit plan, policy, program or practice (or its participation
   in any such PSCo Benefit Plan or other employee benefit plan, policy,
   program or practice) at any time sponsored, maintained or contributed to
   by PSCo or any of its subsidiaries, effective as of any date before, on or
   after the Effective Time except to the extent that any retroactive
   amendment would be prohibited by ERISA section 204(g).

               (k)   Reportable Events; Claims.  Except as disclosed in
   Section 4.10(k) of the PSCo Disclosure Schedule, (i) no event constituting
   a "reportable event" (within the meaning of ERISA section 4043(b)) for
   which the 30-day notice requirement has not been waived by the PBGC has
   occurred with respect to any PSCo Benefit Plan and (ii) no liability,
   claim, action or litigation has been made, commenced or, to the best
   knowledge of PSCo, threatened, by or against PSCo or any of its
   subsidiaries with respect to any PSCo Benefit Plan (other than for
   benefits or PBGC premiums payable in the ordinary course) that could
   reasonably be expected to have to a PSCo Material Adverse Effect.

               (l)   Labor Agreements.  To the best knowledge of PSCo, as of
   the date hereof, there is no current labor union representation question
   involving employees of PSCo or any of its subsidiaries, nor does PSCo or
   any of its subsidiaries know of any activity or proceeding of any labor
   organization (or representative thereof) or employee group (or
   representative thereof) to organize any such employees.  Except as
   disclosed in the PSCo SEC Reports or as disclosed in Section 4.10(l) of
   the PSCo Disclosure Schedule:  (i) neither PSCo nor any of its
   subsidiaries 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 PSCo or any of
   its subsidiaries pending, or to the best knowledge of PSCo, threatened,
   that has, or reasonably may be expected by PSCo to have, a PSCo 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

                                        16
<PAGE>

   or the termination thereof or other discriminatory, wrongful or tortious
   conduct in connection with the employment relationship against PSCo or any
   of its subsidiaries pending, or to the best knowledge of PSCo, threatened,
   that has, or reasonably may be expected by PSCo to have, a PSCo Material
   Adverse Effect; (iv) there is no strike, dispute, slowdown, work stoppage
   or lockout pending, or to the best knowledge of PSCo, threatened, against
   or involving PSCo or any of its subsidiaries that has or, insofar as
   reasonably can be foreseen, could have, a PSCo Material Adverse Effect;
   (v) PSCo and each of its subsidiaries are in compliance with all
   applicable laws respecting employment and employment practices, terms and
   conditions of employment, wages, hours of work and occupational safety and
   health, except for non-compliance that, in the aggregate, does not, and
   insofar as reasonably can be foreseen, will not, have a PSCo Material
   Adverse Effect; and (vi) there is no proceeding, claim, suit, action or
   governmental investigation pending or, to the best knowledge of PSCo,
   threatened in respect to which any director, officer, employee or agent of
   PSCo or any of its subsidiaries is or may be entitled to claim
   indemnification from PSCo or any of its subsidiaries pursuant to their
   respective articles of incorporation or bylaws or as provided in the
   indemnification agreements listed on Section 4.10(l) of the PSCo
   Disclosure Schedule.

               Section 4.11 Environmental Protection.

               (a)   Compliance.  Except as disclosed in Section 4.11(a) of
   the PSCo Disclosure Schedule, or as disclosed in the PSCo SEC Reports,
   each of PSCo and each of its subsidiaries 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 PSCo Material Adverse Effect.  Except as
   disclosed in Section 4.11(a) of the PSCo Disclosure Schedule, neither PSCo
   nor any of its subsidiaries has received any written notice from any
   person or Governmental Authority that alleges that PSCo or any of its
   subsidiaries 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 PSCo Material Adverse Effect.

               (b)   Environmental Permits.  Except as disclosed in Section
   4.11(b) of the PSCo Disclosure Schedule, or as disclosed in the PSCo SEC
   Reports, PSCo and each of its subsidiaries 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 PSCo
   and its subsidiaries 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 PSCo Material Adverse Effect.

               (c)   Environmental Claims.  Except as disclosed in Section
   4.11(c) of the PSCo Disclosure Schedule, or as disclosed in the PSCo SEC
   Reports, to the best knowledge of PSCo, there is no Environmental Claim
   (as hereinafter defined in Section 4.11(g)) pending, or to the best
   knowledge of PSCo, threatened (i) against PSCo or any of its subsidiaries
   or joint ventures, (ii) against any person or entity whose liability for
   any Environmental Claim PSCo 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

                                        17
<PAGE>

   PSCo 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 PSCo Material Adverse Effect.

               (d)   Releases.  Except as disclosed in Section 4.11(c) or
   4.11(d) of the PSCo Disclosure Schedule, or as disclosed in the PSCo SEC
   Reports, to the best knowledge of PSCo, 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 PSCo or any subsidiary
   or joint venture of PSCo, or against any person or entity whose liability
   for any Environmental Claim PSCo or any subsidiary or joint venture of
   PSCo 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 PSCo Material Adverse Effect.

               (e)   Predecessors.  Except as disclosed in Section 4.11(e) of
   the PSCo Disclosure Schedule, or as disclosed in the PSCo SEC Reports, to
   the best knowledge of PSCo, with respect to any predecessor of PSCo or any
   subsidiary or joint venture of PSCo, there are no Environmental Claims
   pending or 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 PSCo reasonably believes would have, in the aggregate
   a PSCo Material Adverse Effect.

               (f)   Disclosure.  To the best knowledge of PSCo, PSCo has
   disclosed to SPS all material facts that PSCo reasonably believes form the
   basis of a PSCo 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 PSCo or its subsidiaries that
   would have, or that PSCo reasonably believes would have, in the aggregate
   a PSCo Material Adverse Effect.

               (g)   As used in this Agreement:

              (i)    "Environmental Claim" means any and all administrative,
         regulatory or judicial actions, suits, demands, demand letters,
         directives, claims, liens, investigations, proceedings or notices of
         noncompliance or violation 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 PSCo or any of
         its subsidiaries or joint ventures (for purposes of this
         Section 4.11 only), or by SPS 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

                                        18
<PAGE>

         human health or the environment (including, without limitation,
         ambient air, surface water, groundwater, land surface or subsurface
         strata), including, without limitation, laws and regulations
         relating to Releases or threatened Releases of Hazardous Materials
         or otherwise relating to the manufacture, processing, distribution,
         use, treatment, storage, disposal, transport or handling of
         Hazardous Materials.

            (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 PSCo or any of its
         subsidiaries or joint ventures operates (for purposes of this
         Section 4.11 only) or in which SPS or any of its subsidiaries or
         joint ventures operates (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.  PSCo is regulated as a
   public utility in the State of Colorado and one of its wholly owned
   subsidiaries is regulated as a public utility in the State of Wyoming. 
   Except as disclosed in Section 4.12 of the PSCo Disclosure Schedule,
   neither PSCo nor any subsidiary company or affiliate of PSCo 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.  PSCo 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 PSCo Merger
   by two-thirds of all votes entitled to be cast by all holders of PSCo
   Common Stock and PSCo Preferred Stock voting together as a single class
   (the "PSCo Shareholders' Approvals") are the only votes of the holders of
   any class or series of the capital stock of PSCo required to approve this
   Agreement, the Merger Agreements, the Mergers and the other transactions
   contemplated hereby.

               Section 4.14 Accounting Matters.  PSCo has not, through the
   date hereof, taken or agreed to take any action that would prevent the
   Company from accounting for the business combination to be effected by the
   Mergers as a pooling-of-interests in accordance with GAAP and applicable
   SEC regulations.

               Section 4.15 Opinion of Financial Advisor.  PSCo has received
   the opinion of Barr Devlin & Co. Incorporated, dated the date hereof, to

                                        19
<PAGE>

   the effect that, as of the date hereof, the PSCo Conversion Ratio is fair
   from a financial point of view to the holders of PSCo Common Stock.

               Section 4.16 Insurance.  Except as disclosed in Section 4.16
   of the PSCo Disclosure Schedule, each of PSCo and each of its subsidiaries
   is, and has been continuously since January 1, 1990, insured in such
   amounts and against such risks and losses as are customary for companies
   conducting the respective businesses conducted by PSCo and its
   subsidiaries during such time period.  Except as disclosed in Section 4.16
   of the PSCo Disclosure Schedule, neither PSCo nor any of its subsidiaries
   has received any notice of cancellation or termination with respect to any
   material insurance policy thereof.  All material insurance policies of
   PSCo and its subsidiaries are valid and enforceable policies.

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

               Section 4.18 PSCo Rights Agreement.  PSCo shall take all
   necessary action with respect to all of the outstanding rights to purchase
   common stock of PSCo (the "PSCo Rights") issued pursuant to the Rights
   Agreement, dated as of February 26, 1991 (the "PSCo Rights Agreement"),
   between PSCo and Mellon Bank, N.A., as Rights Agent, so that PSCo, as of
   the time immediately prior to the Effective Time, will have no obligations
   under the PSCo Rights or the PSCo Rights Agreement, except for the payment
   of any redemption price, if required, and so that the holders of the PSCo
   Rights will have no rights under the PSCo Rights or the PSCo Rights Agree-
   ment except for the payment of any redemption price, if required. 
   Assuming the accuracy of the representation contained in Section 5.17, the
   execution, delivery and performance of this Agreement will not result in a
   distribution of, or otherwise, trigger, the PSCo Rights under the PSCo
   Rights Agreement.


                                    ARTICLE V

                      REPRESENTATIONS AND WARRANTIES OF SPS

               SPS represents and warrants to PSCo as follows:

               Section 5.1  Organization and Qualification.  Except as
   disclosed in Section 5.1 of the SPS Disclosure Schedule (as defined in
   Section 7.6(i)), each of SPS and each of its subsidiaries is a corporation
   duly organized, validly existing and in good standing under the laws of
   its jurisdiction of incorporation, has all requisite corporate power and
   authority, and has been duly authorized by all necessary regulatory
   approvals and orders, to own, lease and operate its assets and properties
   and to carry on its business as it is now being conducted, and is duly
   qualified and in good standing to do business in each jurisdiction in
   which the nature of its business or the ownership or leasing of its assets
   and properties makes such qualification necessary other than in such
   jurisdictions where the failure to be so qualified and in good standing
   will not, when taken together with all other such failures, have a
   material adverse effect on the business, operations, properties, assets,
   condition (financial or otherwise), prospects or results of operations of
   SPS and its subsidiaries taken as a whole or on the consummation of this
   Agreement or the SPS Merger Agreement (any such material adverse effect
   being hereinafter referred to as a "SPS Material Adverse Effect").

               Section 5.2  Subsidiaries.  Section 5.2 of the SPS Disclosure
   Schedule contains a description as of the date hereof of all subsidiaries

                                        20
<PAGE>

   and joint ventures of SPS, 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 and
   SPS's interest therein.  Except as disclosed in Section 5.2 of the SPS
   Disclosure Schedule, none of such entities is a "public utility company",
   a "holding company", a "subsidiary company" or an "affiliate" of any
   public utility company within the meaning of Section 2(a)(5), 2(a)(7),
   2(a)(8) or 2(a)(11) of the 1935 Act, respectively.  Except as disclosed in
   Section 5.2 of the SPS Disclosure Schedule, all of the issued and
   outstanding shares of capital stock of each subsidiary of SPS are validly
   issued, fully paid, nonassessable and free of preemptive rights and are
   owned directly or indirectly by SPS free and clear of any liens, claims,
   encumbrances, security interests, equities, charges and options of any
   nature whatsoever, and there are no outstanding subscriptions, options,
   calls, contracts, voting trusts, proxies or other commitments,
   understandings, restrictions, arrangements, rights or warrants, including
   any right of conversion or exchange under any outstanding security,
   instrument or other agreement, obligating any such subsidiary to issue,
   deliver or sell, or cause to be issued, delivered or sold, additional
   shares of its capital stock or obligating it to grant, extend or enter
   into any such agreement or commitment.

               Section 5.3  Capitalization.  The authorized capital stock of
   SPS consists of 100,000,000 shares of SPS Common Stock and 5,000,000
   shares of SPS Preferred Stock.  As of the close of business on July 31,
   1995, (i) 40,917,908 shares of SPS Common Stock and 1,416,800 shares of
   SPS Preferred Stock were issued and outstanding.  All of the issued and
   outstanding shares of the capital stock of SPS are validly issued, fully
   paid, nonassessable and free of preemptive rights.  Except as disclosed in
   Section 5.3 of the SPS Disclosure Schedule and except for the SPS Rights
   (as defined in Section 5.18), 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 SPS or
   any of its subsidiaries to issue, deliver or sell, or cause to be issued,
   delivered or sold, additional shares of the capital stock or other voting
   securities of SPS or obligating SPS or any of its subsidiaries to grant,
   extend or enter into any such agreement or commitment.

               Section 5.4  Authority; Non-Contravention; Statutory
   Approvals; Compliance.  
               (a)   Authority.  SPS has all requisite power and authority to
   enter into this Agreement and the SPS Merger Agreement and, subject to the
   SPS Shareholders' Approvals (as defined in Section 5.13) and the SPS
   Required Statutory Approvals (as defined in Section 5.4(c), to consummate
   the transactions contemplated hereby and thereby.  The execution and
   delivery of this Agreement and the SPS Merger Agreement and the
   consummation by SPS of the transactions contemplated hereby and thereby
   have been duly authorized by all necessary corporate action on the part of
   SPS, subject to obtaining the SPS Shareholders' Approvals.  This Agreement
   has been, and the SPS Merger Agreement will be, duly and validly executed
   and delivered by SPS and, assuming the due authorization, execution and
   delivery hereof by PSCo and the Company and of the SPS Merger Agreement by
   Merger Sub B, constitutes, or will constitute, the legal, valid and
   binding obligation of SPS enforceable against SPS in accordance with its
   terms.

               (b)   Non-Contravention.  Except as disclosed in Section
   5.4(b) of the SPS Disclosure Schedule the execution and delivery of this
   Agreement by SPS do not, and the execution and delivery of the SPS Merger

                                        21
<PAGE>

   Agreement and the consummation of the transactions contemplated hereby and
   thereby will not result in any Violation by SPS or any of its subsidiaries
   or, to the best knowledge of SPS, any of its joint ventures under any
   provisions of (i) the articles of incorporation, bylaws or similar
   governing documents of SPS or any of its subsidiaries or joint ventures,
   (ii) subject to obtaining the SPS Required Statutory Approvals and the
   receipt of the SPS Shareholders' Approvals, any statute, law, ordinance,
   rule, regulation, judgment, decree, order, injunction, writ, permit or
   license of any Governmental Authority applicable to SPS or any of its
   subsidiaries or joint ventures or any of their respective properties or
   assets, or (iii) subject to obtaining the third-party consents or other
   approvals disclosed in Section 5.4(b) of the SPS Disclosure Schedule (the
   "SPS 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 SPS 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 SPS Material Adverse Effect.

               (c)   Statutory Approvals.  Except as disclosed in Section
   5.4(c) of the SPS Disclosure Schedule, 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 SPS Merger Agreement by SPS or the
   consummation by SPS of the transactions contemplated hereby or thereby,
   the failure to obtain, make or give which would have, in the aggregate, a
   SPS Material Adverse Effect (the "SPS Required Statutory Approvals"), it
   being understood that references in this Agreement to "obtaining" such SPS
   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 disclosed in Section 5.4(d) or
   5.11 of the SPS Disclosure Schedule or as disclosed in the SPS SEC Reports
   (as defined in Section 5.5), neither SPS nor any of its subsidiaries nor,
   to the best knowledge of SPS, any of its 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
   applicable Environmental Laws), of any Governmental Authority, except for
   violations that, in the aggregate, do not have, and, to the best knowledge
   of SPS, are not reasonably likely to have, a SPS Material Adverse Effect. 
   Except as disclosed in Section 5.4(d) or 5.11 of the SPS Disclosure
   Schedule, SPS, its subsidiaries and, to the best knowledge of SPS, its
   joint ventures have all Permits, except those the failure to obtain which
   would not, in the aggregate, have a SPS Material Adverse Effect.

               Section 5.5  Reports and Financial Statements.  The filings
   required to be made by SPS and its subsidiaries since January 1, 1990
   under the Securities Act, the Exchange Act, applicable New Mexico, Texas,
   Oklahoma and Kansas laws and regulations or the Power Act have been filed
   with the SEC, the New Mexico Public Utility Commission (the "New Mexico
   Commission"), the Public Utility Commission of Texas (the "Texas
   Commission"), the Corporation Commission of Oklahoma (the "Oklahoma
   Commission"), the Kansas Corporation Commission (the "Kansas Commission"),
   or the FERC, as the case may be, including all forms, statements, reports,
   agreements (oral or written) and all documents, exhibits, amendments and
   supplements appertaining thereto, and complied in all material respects
   with all applicable requirements of the appropriate act and the rules and

                                        22
<PAGE>

   regulations thereunder.  No filings by SPS or its subsidiaries have been
   required under the 1935 Act, the Natural Gas Act or the Atomic Energy Act. 
   SPS has made available to PSCo a true and complete copy of each report,
   schedule, registration statement and definitive proxy statement filed by
   SPS with the SEC since January 1, 1990 and through the date hereof (as
   such documents have since the time of their filing been amended, the "SPS
   SEC Reports").  The SPS 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 SPS with the SEC after the
   date hereof, did not and will not contain any untrue statement of a
   material fact or omit to state a material fact required to be stated
   therein or necessary to make the statements therein, in light of the
   circumstances under which they were made, not misleading.  The audited
   consolidated financial statements and unaudited interim financial
   statements of SPS included in the SPS SEC Reports (collectively, the "SPS
   Financial Statements") have been prepared, and will be prepared in
   accordance with GAAP (except as may be indicated therein or in the notes
   thereto and except with respect to unaudited statements as permitted by
   Form 10-Q) and fairly present the consolidated financial position of SPS
   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.  True, accurate and
   complete copies of the articles of incorporation and bylaws of SPS, as in
   effect on the date hereof, have been delivered to PSCo.

               Section 5.6  Absence of Certain Changes or Events.  Except as
   disclosed in the SPS SEC Reports filed prior to the date hereof or as
   disclosed in Section 5.6 of the SPS Disclosure Schedule, from December 31,
   1994 through the date hereof each of SPS and each of its subsidiaries has
   conducted its business 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, to the best knowledge of SPS, is
   reasonably likely to have, a SPS Material Adverse Effect.  For purposes of
   the Section 5.6, the amount of any fine or penalty imposed or assessed
   against SPS after the date of this Agreement may be taken into account in
   determining whether a SPS Material Adverse Effect has occurred regardless
   of whether or not the event, fact or condition which lead to the
   imposition or assessment of the fine or penalty has been disclosed in the
   SPS SEC Reports or the SPS Disclosure Schedule.

               Section 5.7  Litigation.  Except as disclosed in the SPS SEC
   Reports filed prior to the date hereof or as disclosed in Section 5.7, 5.9
   or 5.11 of the SPS Disclosure Schedule, (i) there are no claims, suits,
   actions or proceedings pending or, to the best knowledge of SPS,
   threatened, nor are there any investigations or reviews pending or, to the
   best knowledge of SPS, threatened against, relating to or affecting SPS or
   any of its subsidiaries, (ii) there have not been any developments since
   December 31, 1994 with respect to any such disclosed claims, suits,
   actions, proceedings, investigations or reviews, and (iii) there are no
   judgments, decrees, injunctions, rules or orders of any court,
   governmental department, commission, agency, instrumentality or authority
   or any arbitrator applicable to SPS or any of its subsidiaries that in the
   aggregate would have, or to the best knowledge of SPS are reasonably
   likely to have, a SPS 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 SPS for
   inclusion or incorporation by reference in (i) the Registration Statement
   will, at the time the Registration Statement becomes effective under the
   Securities Act, contain any untrue statement of a material fact or omit to

                                        23
<PAGE>

   state any material fact required to be stated therein or necessary to make
   the statements therein not misleading and (ii) the Joint Proxy Statement
   will, at the date mailed to the shareholders of SPS and PSCo 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 Mergers, 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 are made, not misleading.  The Registration Statement and
   the Joint Proxy Statement 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.

               (a)   Filing of Timely Tax Returns.  Except as disclosed in
   Section 5.9(a) of the SPS Disclosure Schedule, SPS and each of its
   subsidiaries have filed all Tax Returns required to be filed by each of
   them under applicable law.  All Tax Returns were in all material respects
   (and, as to Tax Returns not filed as of the date hereof, will be) true,
   complete and correct and filed on a timely basis.

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

               (c)   Tax Reserves.  SPS and its subsidiaries have established
   (and until the Closing Date will maintain) on their books and records
   reserves adequate to pay all Taxes and reserves for deferred income taxes
   in accordance with GAAP.

               (d)   Tax Liens.  There are no Tax liens upon the assets of
   SPS or any of its subsidiaries except liens for Taxes not yet due.

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

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

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

               (h)   Expiration of Statute of Limitations.  Except as
   disclosed in Section 5.9(h) of the SPS Disclosure Schedule, the statute of
   limitations for the assessment of all Taxes has expired for all applicable
   Tax Returns of SPS and each of its subsidiaries or those Tax Returns have
   been examined by the appropriate taxing authorities for all periods

                                        24
<PAGE>

   through the date hereof, and no deficiency for any Taxes has been
   proposed, asserted or assessed against SPS or any of its subsidiaries that
   has not been resolved and paid in full.

               (i)   Audit, Administrative and Court Proceedings.  Except as
   disclosed in Section 5.9(i) of the SPS Disclosure Schedule, no audits or
   other administrative proceedings or court proceedings are presently
   pending with regard to any Taxes or Tax Returns of SPS or any of its
   subsidiaries.

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

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

               (l)   Availability of Tax Returns.  SPS and its subsidiaries
   have made available to PSCo complete and accurate copies covering all
   years ending on or after December 31, 1990, of (i) all Tax Returns, and
   any amendments thereto, filed by SPS or any of its subsidiaries, (ii) all
   audit reports received from any taxing authority relating to any Tax
   Return filed by SPS or any of its subsidiaries and (iii) any Closing
   Agreements entered into by SPS or any of its subsidiaries with any taxing
   authority.

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

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

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

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

               (q)   Code sections 6661 and 6662.  Except as disclosed in
   Section 5.9(q) of the SPS Disclosure Schedule, all transactions that could
   give rise to an understatement of federal income tax (within the meaning

                                        25
<PAGE>

   of Code section 6661 for Tax Returns filed on or before December 31, 1989,
   and within the meaning of Code section 6662 for tax returns filed after
   December 31, 1989) that could reasonably be expected to result in a SPS
   Material Adverse Effect have been adequately disclosed (or, with respect
   to Tax Returns filed following the Closing will be adequately disclosed)
   on the Tax Returns of SPS and its subsidiaries in accordance with Code
   section 6661(b)(2)(B) for Tax Returns filed on or prior to December 31,
   1989, and in accordance with Code section 6662(d)(2)(B) for Tax Returns
   filed after December 31, 1989.

               (r)   Code section 280G.  Except as disclosed in Section
   5.9(r) of the SPS Disclosure Schedule, neither SPS nor any of its
   subsidiaries is a party to any agreement, contract, or arrangement that
   could reasonably be expected to result, on account of the transactions
   contemplated hereunder, separately or in the aggregate, in the payment of
   any "excess parachute payment" within the meaning of Code section 280G.

               (s)   NOLS.  As of December 31, 1993, SPS and its subsidiaries
   had net operating loss carryovers available to offset future income as
   disclosed in Section 5.9(s) of the SPS Disclosure Schedule.  Section
   5.9(s) of the SPS Disclosure Schedule discloses the amount of and year of
   expiration of each company's net operating loss carryovers.

               (t)   Credit Carryover.  As of December 31, 1993, SPS and its
   subsidiaries had tax credit carryovers available to offset future tax
   liability as disclosed in Section 5.9(t) of the SPS Disclosure Schedule. 
   Section 5.9(t) of the SPS Disclosure Schedule discloses the amount and
   year of expiration of each company's tax credit carryovers.

               (u)   Code section 338 Elections.  Except as disclosed in
   Section 5.9(u) of the SPS Disclosure Schedule, no election under Code
   section 338 (or any predecessor provision) has been made by or with
   respect to SPS or any of its subsidiaries or any of their respective
   assets or properties.

               (v)   Acquisition Indebtedness.  Except as disclosed in
   Section 5.9(v) of the SPS Disclosure Schedule, no indebtedness of SPS or
   any of its subsidiaries is "corporate acquisition indebtedness" within the
   meaning of Code section 279(b).

               (w)   Intercompany Transactions.  Except as disclosed in
   Section 5.9(w) of the SPS Disclosure Schedule, neither SPS nor any of its
   subsidiaries have engaged in any intercompany transactions within the
   meaning of Treasury Regulations section 1.1502-13 for which any income or
   gain will remain unrecognized as of the close of the last taxable year
   prior to the Closing Date.

               Section 5.10 Employee Matters; ERISA.

               (a)   Benefit Plans.  Section 5.10(a) of the SPS Disclosure
   Schedule contains a true and complete list of:  (i) each employee benefit
   plan, program or arrangement covering employees, former employees or
   directors of SPS (or any of its subsidiaries) or any of their dependents
   or beneficiaries, or providing benefits to such persons in respect of
   services provided to any such entity, including, but not limited to, any
   "employee benefit plan" within the meaning of ERISA section 3(3) (whether
   or not terminated, if SPS or any of its subsidiaries could have statutory
   or contractual liability with respect thereto on or after the date
   hereof); (ii) each management, employment, deferred compensation,
   severance (including any payment, right or benefit resulting from a change
   in control), bonus or other contract for personal services with or

                                        26
<PAGE>

   covering any current officer, key employee or director or any consulting
   contract with any person who prior to entering into such contract was a
   director or officer of SPS or any of its subsidiaries (whether or not
   terminated, if SPS or any of its subsidiaries could have statutory or
   contractual liability with respect thereto on or after the date hereof);
   (iii) each "employee pension benefit plan" (within the meaning of ERISA
   section 3(2)) subject to Title IV of ERISA or the minimum funding
   requirements of Code section 412 maintained or contributed to by SPS or
   any entity required to be aggregated therewith pursuant to Code
   section 414(b) or (c) (a "SPS ERISA Affiliate") at any time during the
   seven-year period immediately preceding the date hereof (collectively, the
   "SPS Benefit Plans") and (iv) with respect to each SPS Benefit Plan, the
   source or sources of benefit payments under the plan (including, where
   applicable, the identity of any trust (whether or not a grantor trust),
   insurance contract, custodial account, agency agreement, or other
   arrangement that holds the assets of, or serves as a funding vehicle or
   source of benefits for, such SPS Benefit Plan).

               (b)   Contributions.  Except as disclosed in Section 5.10(b)
   of the SPS Disclosure Schedule, all material contributions and other
   payments required to have been made by SPS or any of its subsidiaries
   pursuant to any SPS Benefit Plan (or to any person pursuant to the terms
   thereof) have been timely made or the amount of such payment or
   contribution obligation has been reflected in the SPS Financial
   Statements.

               (c)   Qualification; Compliance.  Except as disclosed in
   Section 5.10(c) of the SPS Disclosure Schedule, each SPS Benefit Plan that
   is intended to be "qualified" within the meaning of Code section 401(a)
   has been determined by the IRS to be so qualified, and, to the best
   knowledge of SPS, no event or condition exists or has occurred that could
   reasonably be expected to result in the revocation of any such
   determination.  SPS and each of its subsidiaries are in compliance with,
   and each SPS Benefit Plan is and has been operated in compliance with, all
   applicable laws, rules and regulations governing such plan, including,
   without limitation, ERISA and the Code, except for violations that could
   not reasonably be expected to have a SPS Material Adverse Effect.  To the
   best knowledge of SPS, no individual or entity has engaged in any
   transaction with respect to any SPS Benefit Plan as a result of which SPS
   or any of its subsidiaries could reasonably expect to be subject to
   liability pursuant to ERISA section 409 or section 502, or subject to an
   excise tax pursuant to Code section 4975.  To the best knowledge of SPS,
   (i) no SPS Benefit Plan is subject to any ongoing audit, investigation, or
   other administrative proceeding of the Internal Revenue Service, the
   Department of Labor, or any other federal, state, or local governmental
   entity, and (ii) no SPS Benefit Plan is the subject of any pending
   application for administrative relief under any voluntary compliance
   program of any governmental entity (including, without limitation, the
   IRS's Voluntary Compliance Resolution Program or Walk-in Closing Agreement
   Program, or the Department of Labor's Delinquent Filer Voluntary
   Compliance Program).

               (d)   Liabilities.  With respect to the SPS Benefit Plans,
   individually and in the aggregate, no termination or partial termination
   of any SPS Benefit Plan or other event has occurred, and, to the best
   knowledge of SPS, there exists no condition or set of circumstances, that
   could subject SPS or any of its subsidiaries to any liability arising
   under the Code, ERISA or any other applicable law (including, without
   limitation, any liability to or under any such plan or to the PBGC), or
   under any indemnity agreement to which SPS, any of its subsidiaries or any
   SPS ERISA Affiliate is a party, which liability, excluding liability for

                                        27
<PAGE>

   benefit claims and funding obligations payable in the ordinary course and
   liability for PBGC insurance premiums payable in the ordinary course,
   could reasonably be expected to have a SPS Material Adverse Effect.

               (e)   Welfare Plans.  Except as disclosed in Section 5.10(e)
   of the SPS Disclosure Schedule, no SPS Benefit Plan that is a "welfare
   plan" (within the meaning of ERISA section 3(1)) provides benefits for any
   retired or former employees (other than as required pursuant to ERISA
   section 601).

               (f)   Documents Made Available.  SPS has made available to
   PSCo a true and correct copy of each collective bargaining agreement to
   which SPS is a party or under which SPS has obligations and, with respect
   to each SPS Benefit Plan, as applicable (i) the current plan document
   (including all amendments adopted since the most recent restatement) and
   its most recently prepared summary plan description and all summaries of
   material modifications prepared since the most recent summary plan
   description, (ii) the most recently prepared annual report (IRS Form 5500
   Series) including financial statements, (iii) each related trust
   agreement, insurance contract, service provider or investment management
   agreement (including all amendments to each such document), (iv) the most
   recent IRS determination letter with respect to the qualified status under
   Code section 401(a) of such plan and a copy of any application of an IRS
   determination letter filed since the most recent IRS determination letter
   was issued, and (v) the most recent actuarial report or valuation.

               (g)   Payments Resulting from Mergers.  Other than as set
   forth in Section 7.11 or disclosed in Section 5.10(g) of the SPS
   Disclosure Schedule, the consummation or announcement of any transaction
   contemplated by this Agreement will not (either alone or upon the
   occurrence of any additional or further acts or events) result in any (i)
   payment (whether of severance pay or otherwise) becoming due from the
   Company or SPS or any of its subsidiaries under any applicable SPS Benefit
   Plans to any officer, employee, former employee or director thereof or to
   the trustee under any "rabbi trust" or similar arrangement, or (ii)
   benefit under any SPS Benefit Plan being established or becoming
   accelerated, vested or payable, except for a payment or benefit that would
   have been payable under the same terms and conditions without regard to
   the transactions contemplated by this Agreement.

               (h)   Funded Status of Plans.  Except as disclosed in Section
   5.10(h) of the SPS Disclosure Schedule, each SPS Benefit Plan that is
   subject to either or both of the minimum funding requirements of ERISA
   section 302 or to Title IV of ERISA has assets that, as of the date
   hereof, have a fair market value equal to or exceeding the present value
   of the accrued benefit obligations thereunder on a termination basis, as
   of the date hereof based on the actuarial methods, tables and assumptions
   theretofore utilized by such plan's actuary in preparing such plan's most
   recently prepared actuarial valuation report, except to the extent that
   applicable law would require the use of different actuarial assumptions if
   such plan was to be terminated as of the date hereof.  No SPS Benefit Plan
   subject to the minimum funding requirements of ERISA section 302 has
   incurred any "accumulated funding deficiency" (within the meaning of ERISA
   section 302).

               (i)   Multiemployer Plans.  Except as disclosed in
   Section 5.10(i) of the SPS Disclosure Schedule, no SPS Benefit Plan is or
   was a "multiemployer plan" (within the meaning of ERISA
   section 4001(a)(3)), a multiple employer plan described in Code
   section 413(c), or a "multiple employer welfare arrangement" (within the
   meaning of ERISA section 3(40)); and none of SPS, any subsidiary thereof

                                        28
<PAGE>

   or any SPS ERISA Affiliate has been obligated to contribute to, or
   otherwise has or has had any liability with respect to, any multiemployer
   plan, multiple employer plan, or multiple employer welfare arrangement. 
   With respect to any SPS Benefit Plan that is listed in Section 5.10(i) of
   the SPS Disclosure Schedule as a multiemployer plan, SPS and its
   subsidiaries have not made or incurred a "complete withdrawal" or a
   "partial withdrawal," as such terms are defined in ERISA sections 4203 and
   4205, therefrom at any time during the five calendar year period
   immediately preceding the date of this Agreement and the transactions
   contemplated by the Agreement will not, in and of themselves, give rise to
   such a "complete withdrawal" or "partial withdrawal."

               (j)   Modification or Termination of Plans.  Except as
   disclosed in Section 5.10(j) of the SPS Disclosure Schedule:  (i) neither
   SPS nor any subsidiary of SPS is subject to any legal, contractual,
   equitable or other obligation to establish as of any date any employee
   benefit plan of any nature, including (without limitation) any pension,
   profit sharing, welfare, post-retirement welfare, stock option, stock or
   cash award, non-qualified deferred compensation or executive compensation
   plan, policy or practice; and (ii) to the best knowledge of SPS after
   review of all SPS Benefit Plan documents, the Company, SPS or one or more
   of its subsidiaries may, in any manner, and without the consent of any
   employee, beneficiary or dependent, employees' organization or other
   person, terminate, modify or amend any SPS Benefit Plan or any other
   employee benefit plan, policy, program or practice (or its participation
   in any such SPS Benefit Plan or other employee benefit plan, policy,
   program or practice) at any time sponsored, maintained or contributed to
   by SPS or any of its subsidiaries, effective as of any date before, on or
   after the Effective Time except to the extent that any retroactive
   amendment would be prohibited by ERISA section 204(g).

               (k)   Reportable Events; Claims.  Except as disclosed in
   Section 5.10(k) of the SPS Disclosure Schedule, (i) no event constituting
   a "reportable event" (within the meaning of ERISA section 4043(b)) for
   which the 30-day notice requirement has not been waived by the PBGC has
   occurred with respect to any SPS Benefit Plan and (ii) no liability,
   claim, action or litigation has been made, commenced or, to the best
   knowledge of SPS, threatened, by or against SPS or any of its subsidiaries
   with respect to any SPS Benefit Plan (other than for benefits or PBGC
   premiums payable in the ordinary course) that could reasonably be expected
   to have a SPS Material Adverse Effect.

               (l)   Labor Agreements.  To the best knowledge of SPS, as of
   the date hereof, there is no current labor union representation question
   involving employees of SPS or any of its subsidiaries, nor does SPS or any
   of its subsidiaries know of any activity or proceeding of any labor
   organization (or representative thereof) or employee group (or
   representative thereof) to organize any such employees.  Except as
   disclosed in the SPS SEC Reports or as disclosed in Section 5.10(l) of the
   SPS Disclosure Schedule:  (i) neither SPS nor any of its subsidiaries 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 SPS or any of its subsidiaries pending,
   or to the best knowledge of SPS, threatened, that has, or reasonably may
   be expected by SPS to have, a SPS 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

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<PAGE>

   connection with the employment relationship against SPS or any of its
   subsidiaries pending, or to the best knowledge of SPS, threatened, that
   has, or reasonably may be expected by SPS to have, a SPS Material Adverse
   Effect; (iv) there is no strike, dispute, slowdown, work stoppage or
   lockout pending, or to the best knowledge of SPS, threatened, against or
   involving SPS or any of its subsidiaries that has or, insofar as
   reasonably can be foreseen, could have, a SPS Material Adverse Effect; (v)
   SPS and each of its subsidiaries are in compliance with all applicable
   laws respecting employment and employment practices, terms and conditions
   of employment, wages, hours of work and occupational safety and health,
   except for non-compliance that, in the aggregate, does not, and insofar as
   reasonably can be foreseen, will not, have a SPS Material Adverse Effect;
   and (vi) there is no proceeding, claim, suit, action or governmental
   investigation pending or, to the best knowledge of SPS, threatened in
   respect to which any director, officer, employee or agent of SPS or any of
   its subsidiaries is or may be entitled to claim indemnification from SPS
   or any of its subsidiaries pursuant to their respective articles of
   incorporation or bylaws or as provided in the indemnification agreements
   listed on Section 5.10(l) of the SPS Disclosure Schedule.

               Section 5.11 Environmental Protection.

               (a)   Compliance.  Except as disclosed in Section 5.11(a) of
   the SPS Disclosure Schedule or as disclosed in the SPS SEC Reports, each
   of SPS and each of its subsidiaries 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 SPS Material Adverse
   Effect.  Except as disclosed in Section 5.11(a) of the SPS Disclosure
   Schedule, neither SPS nor any of its subsidiaries has received any written
   notice from any person or Governmental Authority that alleges that SPS or
   any of its subsidiaries 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 SPS Material Adverse Effect.

               (b)   Environmental Permits.  Except as disclosed in Section
   5.11(b) of the SPS Disclosure Schedule or as disclosed in the SPS SEC
   Reports, each of SPS and each of its subsidiaries 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 SPS and its subsidiaries are in 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 SPS Material Adverse Effect.

               (c)   Environmental Claims.  Except as disclosed in Section
   5.11(c) of the SPS Disclosure Schedule or as disclosed in the SPS SEC
   Reports, to the best knowledge of SPS, there is no Environmental Claim (as
   defined in Section 4.11(g)) pending, or to the best knowledge of SPS,
   threatened (i) against SPS or any of its subsidiaries or joint ventures,
   (ii) against any person or entity whose liability for any Environmental
   Claim SPS 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 SPS 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 SPS
   Material Adverse Effect.


                                        30
<PAGE>

               (d)   Releases.  Except as disclosed in Section 5.11(c) or
   5.11(d) of the SPS Disclosure Schedule or as disclosed in the SPS SEC
   Reports, to the best knowledge of SPS, there has been no Release of any
   Hazardous Material that would be reasonably likely to form the basis of
   any Environmental Claim against SPS or any subsidiary or joint venture of
   SPS, or against any person or entity whose liability for any Environmental
   Claim SPS or any subsidiary or joint venture of SPS 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 SPS Material Adverse Effect.

               (e)   Predecessors.  Except as disclosed in Section 5.11(e) of
   the SPS Disclosure Schedule or as disclosed in the SPS SEC Reports, to the
   best knowledge of SPS with respect to any predecessor of SPS or any
   subsidiary or joint venture of SPS, there are no Environmental Claims
   pending or 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 SPS reasonably believes would have, in the aggregate,
   a SPS Material Adverse Effect.

               (f)   Disclosure.  To the best knowledge of SPS, SPS has
   disclosed to PSCo all material facts that SPS reasonably believes form the
   basis of a SPS 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 SPS or its subsidiaries that
   would have, or that SPS reasonably believes would have, in the aggregate a
   SPS Material Adverse Effect.

               Section 5.12 Regulation as a Utility.  SPS is regulated as a
   public utility in the States of Texas, New Mexico, Oklahoma and Kansas and
   in no other state.  Except as disclosed in Section 5.12 of the SPS
   Disclosure Schedule, neither SPS nor any subsidiary company or affiliate
   of SPS 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.  SPS is not a holding company under the 1935
   Act.

               Section 5.13 Vote Required.  The approval of the SPS Merger by
   two-thirds of all votes entitled to be cast by all holders of SPS Common
   Stock and two-thirds of all votes entitled to be cast by all holders of
   SPS Preferred Stock, each voting as a separate class (the "SPS
   Shareholders' Approval"), are the only votes of the holders of any class
   or series of the capital stock of SPS required to approve this Agreement,
   the Merger Agreement, the Mergers and the other transactions contemplated
   hereby.

               Section 5.14 Accounting Matters.  SPS has not, through the
   date hereof, taken or agreed to take any action that would prevent the
   Company from accounting for the business combination to be effected by the
   Mergers as a pooling-of-interests in accordance with GAAP and applicable
   SEC regulations.

               Section 5.15 Opinion of Financial Advisor.  SPS has received
   the opinion of Dillon, Read & Co. Inc. dated the date hereof, to the
   effect that, as of the date hereof, the SPS Conversion Ratio and
   consideration to be received by the holders of SPS Common Stock are fair
   from a financial point of view to the holders of SPS Common Stock.

                                        31
<PAGE>

               Section 5.16 Insurance.  Except as disclosed in Section 5.16
   of the SPS Disclosure Schedule, each of SPS and each of its subsidiaries
   is, and has been continuously since January 1, 1990, insured in such
   amounts and against such risks and losses as are customary for companies
   conducting the respective businesses conducted by SPS and its subsidiaries
   during such time period.  Except as disclosed in Section 5.16 of the SPS
   Disclosure Schedule, neither SPS nor any of its subsidiaries has received
   any notice of cancellation or termination with respect to any material
   insurance policy thereof.  All material insurance policies of SPS and its
   subsidiaries are valid and enforceable policies.

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

               Section 5.18 SPS Rights Agreement.  SPS shall take all
   necessary action with respect to all of the outstanding rights to purchase
   common stock of SPS (the "SPS Rights") issued pursuant to the Rights
   Agreement dated as of July 23, 1991 between SPS and Ameritrust Company
   National Association, as Rights Agent (the "SPS Rights Agreement"), so
   that SPS, as of the time immediately prior to the Effective Time, will
   have no obligations under the SPS Rights or the SPS Rights Agreement,
   except for the payment of any redemption price, if required, and so that
   the holders of the SPS Rights will have no rights under the SPS Rights or
   the SPS Rights Agreement except for the payment of any redemption price,
   if required.  Assuming the accuracy of the representation contained in
   Section 4.17, the execution, delivery and performance of this Agreement
   will not result in a distribution of, or otherwise, trigger, the SPS
   Rights under the SPS Rights Agreement.


                                    ARTICLE VI

                     CONDUCT OF BUSINESS PENDING THE MERGERS

               PSCo and SPS have each delivered to the other a budget for the
   years 1995 through 1999 (respectively, the "PSCo Budget" and the "SPS
   Budget"), which PSCo or SPS, as the case may be, may update or otherwise
   modify in writing for purposes of this Article VI only with the consent in
   writing of SPS or PSCo, as the case may be.  After the date hereof and
   prior to the Effective Time or earlier termination of this Agreement, each
   of PSCo and SPS 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:

               Section 6.1  Ordinary Course of Business.  Each of PSCo and
   SPS 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, pre-
   serve 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, 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 PSCo nor SPS 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

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<PAGE>

   capital stock other than (i) to such party or its wholly-owned subsid-
   iaries, (ii) stated dividends on PSCo Preferred Stock or SPS Preferred
   Stock, (iii) regular dividends on PSCo Common Stock with usual record and
   payment dates not in excess of an annual rate of $2.04, provided that such
   annual rate may be increased by up to $0.16 and (iv) regular dividends on
   SPS Common Stock with usual record and payment dates not in excess of an
   annual rate of $2.20 per share; (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 (i) redemptions, repurchases and
   other acquisitions of shares of capital stock in the ordinary course of
   business consistent with past practice including, without limitation, (A)
   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 and (B) redemptions, purchases or acquisitions required by the
   respective terms of any series of PSCo Preferred Stock or SPS Preferred
   Stock and (C) in connection with refunding of PSCo Preferred Stock or SPS
   Preferred Stock at a lower cost of funds as permitted pursuant to Section
   6.7, (ii) intercompany acquisitions of capital stock and (iii) the
   redemption, if required, of the PSCo Rights and the SPS Rights pursuant to
   the PSCo Rights Agreement and the SPS Rights Agreement, respectively.

               Section 6.3  Issuance of Securities.  Except as provided in
   the PSCo Budget or the SPS Budget, as the case may be, neither PSCo nor
   SPS 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 or stock appreciation or
   similar rights, as the case may be, pursuant to (i) the PSCo Dividend
   Reinvestment and Share Purchase Plan, Employee Savings and Stock Ownership
   Plan, Omnibus Incentive Plan, Annual Incentive Plan and Long Term
   Incentive Plan or (ii) the Dividend Reinvestment and Cash Payment Plan for
   Shareholders of SPS, the Dividend Reinvestment and Cash Payment Plan for
   Employees of SPS, the SPS 1989 Stock Incentive Plan, the SPS Employee
   Investment Plan, the SPS Non-Qualified Salary Deferral Plan and the SPS
   Directors' Deferred Compensation Plan, 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) the
   issuance by a wholly-owned subsidiary of shares of its capital stock to
   its parent and (c) preferred stock to the extent disclosed in Section 6.7
   of the PSCo Disclosure Schedule or the SPS Disclosure Schedule, provided
   that subject to Section 6.9, the type and amount of annual awards under
   the SPS 1989 Stock Incentive Plan may vary from year to year in accordance
   with the terms of such plan.

               Section 6.4  Charter Documents.   Except as disclosed in
   Section 6.4 of the PSCo Disclosure Schedule or the SPS Disclosure
   Schedule, neither PSCo nor SPS shall amend or propose to amend its
   articles of incorporation or by-laws, except as contemplated herein, in
   any way adverse to the other party.

               Section 6.5  Acquisitions.  Except as disclosed in Section 6.5
   of the PSCo Disclosure Schedule or the SPS Disclosure Schedule, and except
   for acquisitions not exceeding $50,000,000 in the aggregate in the case
   of, on the one hand, PSCo and its subsidiaries and, on the other hand, SPS
   and its subsidiaries, neither PSCo nor SPS shall, nor shall either permit
   any of its subsidiaries to, acquire or agree to acquire, by merging or

                                        33
<PAGE>

   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 organiza-
   tion or division thereof, or otherwise acquire or agree to acquire any
   assets; provided that Quixx Corporation, a subsidiary of SPS, shall be
   permitted to carry on its business of making investments in and developing
   cogeneration and energy-related projects within the limitations of funding
   Quixx Corporation by SPS imposed by the applicable regulatory authorities
   or as approved by the Boards of Directors of Quixx Corporation and SPS.

               Section 6.6  No Dispositions.  Except as disclosed in Section
   6.6 of the PSCo Disclosure Schedule or the SPS Disclosure Schedule, and
   other than (a) dispositions not exceeding $5 million in the aggregate, in
   the case of, on the one hand, PSCo and its subsidiaries and, on the other
   hand, SPS and its subsidiaries, (b) as may be required by law to
   consummate the transactions contemplated hereby or (c) in the ordinary
   course of business consistent with past practice, neither PSCo nor SPS
   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 subsid-
   iaries taken as a whole.

               Section 6.7  Indebtedness.  Except as disclosed in Section 6.7
   of the PSCo Disclosure Schedule or the SPS Disclosure Schedule and except
   as provided in the PSCo Budget and the SPS Budget, as the case may be,
   neither PSCo nor SPS shall, nor shall either permit any of its subsidiar-
   ies 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 maturi-
   ty or at a lower cost of funds, (c) long-term indebtedness in connection
   with the refunding of PSCo Preferred Stock or SPS Preferred Stock at a
   lower cost of funds, and (d) additional indebtedness aggregating in any
   year not more than 110% of the amount provided therefor in the PSCo Budget
   with respect to PSCo and its subsidiaries and in the SPS Budget with
   respect to SPS and its subsidiaries.

               Section 6.8  Capital Expenditures.  Except as disclosed in
   Section 6.8 of the PSCo Disclosure Schedule or the SPS Disclosure Schedule
   or as required by law, neither PSCo nor SPS shall, nor shall either permit
   any of its subsidiaries to, make any capital expenditures, other than (a)
   capital expenditures incurred in connection with the construction of new
   facilities, (b) capital expenditures to repair or replace facilities
   destroyed or damaged due to casualty or accident (whether or not covered
   by insurance) and (c) additional capital expenditures in any year of not
   more than 110% of the amount provided therefor in the PSCo Budget for that
   year with respect to PSCo and its subsidiaries and in the SPS Budget for
   that year with respect to SPS and its subsidiaries.

               Section 6.9  Compensation, Benefits.  Except as disclosed in
   Section 6.9 of the PSCo Disclosure Schedule or the SPS Disclosure
   Schedule, neither PSCo nor SPS shall, nor shall either permit any of its
   subsidiaries to, (i) enter into, adopt or amend (except as may be required
   by applicable law), or increase the amount or accelerate the payment or
   vesting of any benefit or amount payable 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

                                        34
<PAGE>

   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 pursuant to
   binding legal commitments and except for 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 (ii) enter into or amend any employment, severance, special pay
   arrangement with respect to termination of employment or other similar
   contract, agreement or arrangement with any director or officer other than
   in the ordinary course of business consistent with past practice.  

               Section 6.10 1935 Act.  None of the parties hereto shall, nor
   shall any such party permit any of its subsidiaries to, except as required
   or contemplated by this Agreement, engage in any activities that would
   cause a change in its status, or that of its subsidiaries, under the 1935
   Act, or that would impair the ability of PSCo or SPS, respectively, to
   claim an exemption from all provisions of the 1935 Act except Section
   9(a)(2) under Section 3(a)(2) pursuant to Rule 2 of the 1935 Act, other
   than (i) the application to the SEC under the 1935 Act contemplated by
   this Agreement for approval to the extent required of the transactions
   contemplated hereby and (ii) the registration of the Company pursuant to
   the 1935 Act.

               Section 6.11 Accounting.  Neither PSCo nor SPS 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 PSCo nor SPS 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
   Mergers as a pooling of interests in accordance with GAAP and applicable
   SEC regulations.

               Section 6.13 Tax-Free Status.  Neither PSCo nor SPS 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 Mergers as a transaction described in Code
   section 351.

               Section 6.14 Discharge of Liabilities.  Neither PSCo nor SPS
   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 final and unappealable judgments 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 PSCo Disclosure Schedule or the SPS
   Disclosure Schedule.

               Section 6.15 Cooperation, Notification.  Each of PSCo and SPS
   shall:  (a) confer on a regular and frequent basis with one or more repre-
   sentatives of the other to discuss the general status of its ongoing
   operations; (b) promptly notify the other of any significant changes in
   its business, properties, assets, condition (financial or other),

                                        35
<PAGE>

   prospects or results of operations; (c) advise the other of any change or
   event that has had or, insofar as reasonably can be foreseen, is
   reasonably likely to result in, a PSCo Material Adverse Effect or a SPS
   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 PSCo and SPS shall, and 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 parties 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 shall make any filing to change its rates on file with the public
   utility commission of any state or FERC that would have a material adverse
   effect on the benefits associated with the Mergers.

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

               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.

               Section 6.19 Tax-Exempt Status.  No party hereto shall, nor
   shall any party permit any subsidiary to, take any action that would
   likely jeopardize the qualification of the outstanding revenue bonds
   issued for the benefit of PSCo (or any subsidiary thereof) or for the
   benefit of SPS (or any subsidiary thereof) that qualify on the date hereof
   under Code section142(a) as "exempt facility bonds" or as tax-exempt
   industrial development bonds under Section 103(b)(4) of the Internal
   Revenue Code of 1954, as amended prior to the Tax Reform Act of 1986.

               Section 6.20 Transition Management.  PSCo and SPS shall create
   a special transition management task force (the "Task Force") to be headed
   by Wayne H. Brunetti (or an individual designated by him who shall be
   reasonably satisfactory to the other Task Force head) and Bill D. Helton
   (or an individual designated by him and reasonably satisfactory to the
   other Task Force head).  The Task Force shall report its findings to the
   Board of Directors of each of PSCo and SPS.  After the date hereof and
   prior to the Effective Time, Wayne H. Brunetti shall frequently attend
   meetings of SPS's Board of Directors and Bill D. Helton shall frequently
   attend meetings of PSCo's Board of Directors as they deem appropriate in
   consultation with each other.

               Section 6.21 Insurance.  Each of PSCo and SPS shall, and shall
   cause its subsidiaries to, maintain with financially responsible insurance

                                        36
<PAGE>

   companies insurance in such amounts and against such risks and losses as
   are customary for companies engaged in the utility industry and employing
   methods of generating electric power and fuel sources similar to those
   methods employed and fuels used by such party or such party's subsidiar-
   ies. 

               Section 6.22 Permits.  Each party shall, and shall cause its
   subsidiaries to, use reasonable efforts to maintain in effect all existing
   Permits (as defined in Section 4.4) pursuant to which such party or such
   party's subsidiaries operate.


                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS

               Section 7.1  Access to Information.  Upon reasonable notice
   and during normal business hours, each party shall, and shall cause its
   subsidiaries to, afford to the officers, directors, employees,
   accountants, counsel, investment banker, financial advisor and other
   representatives of the other (collectively, "Representatives") reasonable
   access, during normal business hours throughout the period prior to the
   Effective Time, to all of its properties, books, contracts, commitments
   and records (including, but not limited to, Tax Returns) and, during such
   period, each party shall, and shall cause its subsidiaries to, furnish
   promptly to the other (i) a copy of each reasonably available report,
   schedule and other document filed or received by it or any of its
   subsidiaries pursuant to the requirements of federal or state securities
   laws or filed with the SEC, the FERC, the NRC, the Department of Justice,
   the Federal Trade Commission, the Colorado Commission, the Wyoming
   Commission, the New Mexico Commission, the Texas Commission, the Oklahoma
   Commission, the Kansas Commission or any other federal or state regulatory
   agency or commission, and (ii) 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.  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 shall prepare and file with
   the SEC the Registration Statement and the Joint Proxy Statement (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 Company Common Stock
   issuable in connection with the Mergers to be registered or to obtain an
   exemption from registration under applicable state "blue sky" or
   securities laws; provided, however, that none of the Company, SPS or PSCo
   shall be required to register or qualify as a foreign corporation or to
   take any other action that would subject it to general service of process
   in any jurisdiction in which the Company will not, following the Mergers,
   be so subject.  Each of the parties shall furnish all information
   concerning itself that is required or customary for inclusion in the Joint

                                        37
<PAGE>

   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 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 Company Common
   Stock to be issued in the Mergers to be approved for listing on the NYSE
   and any other stock exchanges agreed to by the parties, each upon official
   notice of issuance.

               (b)   Letter of PSCo's Accountants.  Following receipt by
   Arthur Andersen LLP, PSCo's independent auditors, of an appropriate
   request from SPS pursuant to SAS No. 72, PSCo shall use best efforts to
   cause to be delivered to the Company and SPS a letter of Arthur Andersen
   LLP, dated a date within two business days before the effective date of
   the Registration Statement, and addressed to the Company and SPS, in form
   and substance reasonably satisfactory to the Company and SPS and customary
   in scope and substance for "cold comfort" letters delivered by independent
   public accountants in connection with registration statements and proxy
   statements similar to the Joint Proxy/Registration Statement.

               (c)   Letter of SPS's Accountants.  Following receipt by
   Deloitte & Touche, LLP, SPS's independent auditors, of an appropriate
   request from PSCo pursuant to SAS No. 72, SPS shall use best efforts to
   cause to be delivered to the Company and PSCo a letter of Deloitte &
   Touche, LLP, dated a date within two business days before the effective
   date of the Registration Statement, and addressed to the Company and PSCo,
   in form and substance satisfactory to the Company and PSCo and customary
   in scope and substance for "cold comfort" letters delivered by independent
   public accountants in connection with registration statements and proxy
   statements similar to the Joint Proxy/Registration Statement.

               (d)   Fairness Opinions.  It shall be a condition to the
   mailing of the Joint Proxy Statement to the shareholders of SPS and PSCo
   that (i) PSCo shall have received an opinion from Barr Devlin & Co.
   Incorporated, dated the date of the Joint Proxy Statement, to the effect
   that, as of the date thereof, the PSCo Conversion Ratio is fair to the
   holders of PSCo Common Stock, and (ii) SPS shall have received an opinion
   from Dillon, Read & Co. Inc., dated the date of the Joint Proxy Statement,
   to the effect that, as of the date thereof, the SPS Conversion Ratio is
   fair to the holders of SPS Common Stock.

               Section 7.3  Regulatory Matters.

               (a)   HSR Filings.  Each party hereto shall file or cause to
   be filed with the Federal Trade Commission and the Department of Justice
   any notifications required to be filed 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 transactions contemplated
   hereby.  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.

               (b)   Other Regulatory Approvals.  Each party hereto shall
   cooperate and use its best efforts to promptly prepare and file all
   necessary documentation, to effect all necessary applications, notices,
   petitions, filings and other documents, and to use all commercially
   reasonable efforts to obtain all necessary permits, consents, approvals
   and authorizations of all Governmental Authorities and all other persons

                                        38
<PAGE>

   necessary or advisable to consummate the transactions contemplated by this
   Agreement and the Merger Agreements, including, without limitation, the
   PSCo Required Statutory Approvals and the SPS Required Statutory
   Approvals.  SPS shall have the right to review and approve in advance all
   characterizations of the information relating to SPS, on the one hand, and
   PSCo shall have the right to review and approve in advance all
   characterizations of the information relating to PSCo, on the other hand,
   in either case, which appear in any filing made in connection with the
   transactions contemplated by this Agreement, the Merger Agreements or the
   Mergers.  PSCo and SPS 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.

               Section 7.4  Shareholder Approvals.

               (a)   Approval of SPS Shareholders.  SPS 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 "SPS Special Meeting") for the purpose of securing
   the SPS Shareholders' Approvals, (ii) distribute to its shareholders the
   Joint Proxy Statement in accordance with applicable federal and state law
   and with its articles of incorporation and bylaws, (iii) recommend to its
   shareholders the approval of the SPS Merger, this Agreement, the SPS
   Merger Agreement and the transactions contemplated hereby and thereby
   (provided that nothing contained in this Section 7.4 shall require the
   Board of Directors of SPS to take any action or refrain from taking any
   action that such Board determines in good faith and with the advice of
   counsel as set forth in a written, reasoned opinion would result in a
   breach of its fiduciary duties under applicable law), and (iv) cooperate
   and consult with PSCo with respect to each of the foregoing matters.

               (b)   Approval of PSCo Shareholders.  PSCo 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 "PSCo Special Meeting") for the purpose
   of securing the PSCo Shareholders' Approvals, (ii) distribute to its
   shareholders the Joint Proxy Statement in accordance with applicable
   federal and state law and its articles of incorporation and bylaws, (iii)
   recommend to its shareholders the approval of the PSCo Merger, this
   Agreement, the PSCo Merger Agreement and the transactions contemplated
   hereby and thereby (provided that nothing contained in this Section 7.4
   shall require the Board of Directors of PSCo to take any action or refrain
   from taking any action that such Board determines in good faith and with
   the advice of counsel as set forth in a written, reasoned opinion would
   result in a breach of its fiduciary duties under applicable law), and (iv)
   cooperate and consult with SPS with respect to each of the foregoing
   matters.

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

               (d)   Fairness Opinions Not Withdrawn.  It shall be a condi-
   tion to the obligation of PSCo to hold the PSCo Special Meeting that the
   opinion of Barr Devlin & Co. Incorporated referred to in Section 7.2(d)
   shall not have been withdrawn, and it shall be a condition to the
   obligation of SPS to hold the SPS Special Meeting that the opinion of
   Dillon, Read & Co. Inc. referred to in Section 7.2(d) shall not have been
   withdrawn.



                                        39
<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, the Company 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 the
   parties hereto 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, the Merger Agreements or
   the transactions contemplated hereby or thereby.  In the event of any such
   loss, expense, claim, damage, cost, liability, judgment or settlement
   (whether or not arising before the Effective Time), (x) the Company shall
   pay the reasonable fees and expenses of counsel selected by the
   Indemnified Parties, which counsel shall be reasonably satisfactory to the
   Company, 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 Delaware, as applicable, (y) the
   Company shall cooperate in the defense of any such matter and (z) 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 the Company's certificate of incorporation or bylaws shall be
   made by independent counsel mutually acceptable to the Company and the
   Indemnified Party; provided, however, that the Company 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, the Company shall
   reimburse such Indemnified Party for all of its expenses in bringing and
   pursuing such action.  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, the Company shall cause to be maintained in effect the
   policies of directors' and officers' liability insurance maintained by
   PSCo and SPS; provided that the Company 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 at a cost to the Company not greater than 200 percent of the
   current annual premiums for the policies currently maintained by PSCo and
   SPS for their directors' and officers' liability insurance; provided

                                        40
<PAGE>

   further, that if such insurance cannot be so maintained or obtained at
   such cost, the Company shall maintain or obtain as much of such insurance
   for each of PSCo and SPS as can be so maintained or obtained at a cost
   equal to 200 percent of the respective current annual premiums of each of
   PSCo and SPS for their directors' and officers' liability insurance and
   other indemnity agreements.

               (c)   Successors.  In the event the Company 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 the
   Company 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 PSCo, SPS 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 Mergers and shall continue in full
   force and effect for a period of not less than six years from the
   Effective Time.

               Section 7.6  Disclosure Schedules.  On or before the date of
   this Agreement, (i) SPS has delivered to PSCo a schedule (the "SPS
   Disclosure Schedule") accompanied by a certificate signed by the chief
   financial officer of SPS stating that the Disclosure Schedule is being
   delivered pursuant to this Section 7.6(i) and (ii) PSCo has delivered to
   SPS a schedule (the "PSCo Disclosure Schedule") accompanied by a
   certificate signed by the chief financial officer of PSCo stating that the
   PSCo Disclosure Schedule is being delivered pursuant to this
   Section 7.6(ii).  The SPS Disclosure Schedule and the PSCo 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.  PSCo and SPS shall
   cooperate with each other in the development and distribution of all news
   releases and other public information disclosures with respect to this
   Agreement, the Merger Agreements or any of the transactions contemplated
   hereby or thereby and, subject to each party's disclosure obligations
   imposed by law or any applicable national securities exchange, shall not
   issue any public announcement or statement prior to consultation with the
   other party.

               Section 7.8  Rule 145 Affiliates.  SPS shall identify in a
   letter to PSCo, and PSCo shall identify in a letter to SPS, all persons
   who are, at the Closing Date, "affiliates" of SPS and PSCo, respectively,
   as such term is used in Rule 145 under the Securities Act.  SPS and PSCo
   shall use their respective best efforts to cause their respective
   affiliates to deliver to the Company on or prior to the Closing Date a
   written agreement substantially in the form attached as Exhibit C (each,
   an "Affiliate Agreement").

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<PAGE>

               Section 7.9  Employee Agreements and Workforce Matters.

               (a)   Certain Employee Agreements.  Subject to Section 7.10
   and Section 7.15, the Company 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 hereto; provided,
   however, that this undertaking is not intended to prevent the Company from
   enforcing such contracts, agreements, collective bargaining agreements and
   commitments in accordance with their terms or from exercising any right to
   amend, modify, suspend, revoke or terminate any such contract, agreement,
   collective bargaining agreement or commitment.

               (b)   Workforce Matters.  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 the
   Company shall be made on a fair and equitable basis, in light of the
   circumstances and the objectives to be achieved without regard to whether
   employment was with PSCo or its subsidiaries or SPS or its subsidiaries,
   and any employees whose employment is terminated or jobs are eliminated by
   the Company 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 the Company or
   any of its subsidiaries.  Any workforce reductions carried out following
   the Effective Time by the Company and its subsidiaries shall be done in
   accordance with all applicable collective bargaining agreements, and all
   laws and regulations governing the employment relationship thereof
   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
   the Company and any individual, or a waiver of the Company's right to
   discharge any employee at any time, with or without cause.

               Section 7.10 Employee Benefit Plans.  

               Each of the SPS Benefit Plans and PSCo Benefit Plans (other
   than plans specifically provided for in Section 7.11), in effect on the
   date hereof (or as amended in accordance with or as permitted by this
   Agreement) shall be maintained in effect with respect to the employees or
   former employees of SPS and any of its subsidiaries and of PSCo and any of
   its subsidiaries, respectively, who are covered by such plans immediately
   prior to the Closing Date until the Company determines otherwise on or
   after the Effective Time; provided, however, that nothing herein
   contained, other than the provisions of Section 6.9, shall limit any
   reserved right contained in any such SPS Benefit Plan or PSCo Benefit Plan
   to amend, modify, suspend, revoke or terminate any such plan.  Without
   limiting the foregoing, each participant in any SPS Benefit Plan or PSCo
   Benefit Plan shall receive credit for purposes of eligibility to
   participate, vesting and eligibility to receive benefits under any benefit
   plan of the Company or any of its subsidiaries or affiliates for service
   credited for the corresponding purpose under any such benefit plan;
   provided, however, that such crediting of service shall not operate to
   duplicate any benefit to any such participant or the funding for any such
   benefit.  However, no provision contained in this Section 7.10 shall be
   deemed to constitute an employment contract between the Company and any
   individual, or a waiver of the Company's right to discharge any employee
   at any time, with or without cause.  

               Section 7.11 Incentive, Stock and Other Plans.  With respect
   to each of (i) the PSCo Employee Savings and Stock Ownership Plan, Omnibus

                                        42
<PAGE>

   Incentive Plan, Annual Incentive Plan and Long Term Incentive Plan and
   (ii) the SPS 1989 Stock Incentive Plan, the SPS Employee Investment Plan,
   the SPS Non-Qualified Salary Deferral Plan and the SPS Directors' Deferred
   Compensation Plan and each other employee benefit plan, program or
   arrangement under which the delivery of SPS Common Stock, PSCo Common
   Stock or Company Common Stock, as the case may be, is required to be used
   for purposes of the payment of benefits, grant of awards or exercise of
   options (each a "Stock Plan"), (i) PSCo and SPS shall take such action as
   may be necessary so that, after the Effective Time, such Stock Plan shall
   provide for the issuance only of Company Common Stock and (ii) the Company
   shall (x) 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 other applicable law, or,
   to the extent the Company deems it desirable, to enable such Stock Plan to
   comply with Rule 16b-3 promulgated under the Exchange Act, (y) reserve for
   issuance under such Stock Plan or otherwise provide a sufficient number of
   shares of Company Common Stock for delivery upon payment of benefits,
   grants of awards or exercise of options under such Stock Plan and (z) as
   soon as practicable after the Effective Time, file one or more
   registration statements under the Securities Act with respect to the
   shares of Company Common Stock subject to such Stock Plan to the extent
   such filing is required under applicable law and use its 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 Mergers will be subject to the reporting
   requirements under section 16(a) of the Exchange Act, the Company shall
   administer the Stock Plans, where applicable, in a manner that complies
   with Rule 16b-3 under the Exchange Act.  Each of PSCo and SPS shall obtain
   any shareholder approvals that may be necessary for the deduction of any
   compensation payable under any Stock Plan or other compensation
   arrangement.

               Section 7.12 No Solicitations.  No party hereto shall, and
   each such party shall cause its subsidiaries not to, permit any of its
   Representatives to, and shall use its best efforts to cause such persons
   not to, 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, in the event of any unsolicited Takeover Proposal,
   engage in negotiations or provide any confidential information or data to
   any person relating to any Takeover Proposal.  SPS and PSCo 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 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 7.12 to the contrary, in the event of an unsolicited Takeover
   Proposal, unless the PSCo Shareholders' Approvals and the SPS
   Shareholders' Approvals have all been obtained, PSCo or SPS may, to the
   extent that the Board of Directors of such party is advised in a written,
   reasoned opinion of outside counsel that a failure to do so would result
   in a breach of its fiduciary duties under applicable law, participate in
   discussions or negotiations with, furnish information to, and afford
   access to the properties, books and records of such party and its
   subsidiaries to any person in connection with a possible Takeover Proposal

                                        43
<PAGE>

   with respect to such party by such person.  As used in this Section 7.12,
   "Takeover Proposal" shall mean any tender or exchange offer, proposal for
   a merger, consolidation or other business combination involving any party
   or any of its material subsidiaries, or any proposal or offer to acquire
   in any manner a substantial equity interest in, or a substantial portion
   of the assets of, any party or any of its material subsidiaries, other
   than pursuant to the transactions contemplated by this Agreement and the
   Merger Agreements. 

               Section 7.13 Company Board of Directors.  

               (a)   PSCo's and SPS's respective Boards of Directors will
   take such action as may be necessary to cause the number of directors
   comprising the full Board of Directors of the Company at the Effective
   Time to be 14 persons, eight of whom shall be designated by PSCo prior to
   the Effective Time and six of whom shall be designated by SPS prior to the
   Effective Time.  The initial designation of such directors among the three
   classes of the Board of Directors of the Company shall be agreed to by
   PSCo and SPS, the PSCo Designees and the SPS Designees (each as defined in
   Section 10.7) to be divided as equally as possible among such classes;
   provided, however, that if, prior to the Effective Time and until the date
   that is four and one-half years from the Effective Time, any of the PSCo
   Designees or SPS Designees shall decline or be unable to serve, the party
   which designated such person or the remaining PSCo Designees or SPS
   Designees, respectively, shall designate or nominate for any election by
   the stockholders another person to serve in that person's place and the
   Company shall use its best efforts to the fullest extent permitted by law
   to cause the election of such nominated person as a director of the
   Company by the stockholders.  The Board of Directors of the Company will
   have at least four (4) committees consisting of an audit committee, a
   compensation committee, a finance committee, a nominating and civic
   responsibility committee and such other committees as the Board of
   Directors of the Company may determine is appropriate under the
   circumstances.  Two of the above-named committees will be chaired by
   directors nominated by PSCo and two of the above-named committees will be
   chaired by directors nominated by SPS.  In addition to the chairman, the
   membership of each committee shall consist of four members, two of whom
   shall be directors nominated by PSCo and two of whom shall be nominated by
   SPS.

               (b)   During the period from the Effective Time until four and
   one-half years after the Effective Time, (i) the provisions of Section
   7.13(a), Section 7.13(b)(i), Section 7.15 and Section 7.16 shall not be
   modified unless and until the terms of such modification are approved by,
   and no committees other than the four committees listed in Section 7.13(a)
   shall be created except by, the affirmative vote of two-thirds (66 2/3%)
   of the members of the Board of Directors of the Company (i.e., 10 of the
   14 members of the Board of Directors of the Company), and (ii) the
   provisions of Section 7.13(b)(ii) and Section 7.14 shall not be modified
   unless and until the terms of such modification are approved by at least
   10 of the members of the Board of Directors of the Company.

               Section 7.14 Company Directors and Officers.  At the Effective
   Time, pursuant to the terms hereof and of the employment contracts
   referred to in Section 7.15: (a) Mr. Helton shall hold the position of
   Chairman of the Board of Directors and Chief Executive Officer of the
   Company until the later of (i) June 30, 1999 or (ii) 30 months from the
   Effective Time (the "Initial Period"), and shall continue to hold the
   position of Chairman of the Board of Directors of the Company until May
   31, 2001, and (b) Mr. Brunetti shall serve as President, Chief Operating
   Officer and Vice Chairman of the Board of Directors of the Company until

                                        44
<PAGE>

   the end of the Initial Period, at which time he shall be entitled to hold
   the position of Chief Executive Officer of the Company.  In addition,
   beginning June 1, 2001, Mr. Brunetti shall serve as Chairman of the Board
   of Directors of the Company until his successor is elected or appointed
   and shall have qualified in accordance with the General Corporation Law of
   Delaware, the Certificate of Incorporation and the By-Laws of the Company. 
   If either of such persons is unable or unwilling to hold such offices for
   the periods set forth above, his successor shall be selected by the
   affirmative vote of 10 of the members of the Board of Directors of the
   Company.

               Section 7.15 Employment Contracts.  The Company shall, as of
   or prior to the Effective Time, enter into employment contracts with Mr.
   Helton and Mr. Brunetti in the forms set forth in Exhibit D and Exhibit E,
   respectively.

               Section 7.16 Corporate Offices.  Following the Effective Time,
   the Company shall maintain its corporate offices in Denver, Colorado and
   significant operating offices in Amarillo, Texas.

               Section 7.17 Expenses.  Subject to Section 7.1 and Section
   9.3, all costs and expenses incurred in connection with this Agreement and
   the Merger Agreements and the transactions contemplated hereby and thereby
   shall be paid by the party incurring such expenses, except that those
   expenses incurred in connection with printing the Joint Proxy/Registration
   Statement, as well as the filing fee relating thereto, shall be shared
   equally by PSCo, on the one hand, and SPS, on the other hand.

               Section 7.18 Further Assurances.  

               (a)   Each of SPS and PSCo 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 Mergers and other transactions contemplated by this
   Agreement and the Merger Agreements, and to use its 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 regula-
   tions to consummate and make effective the Mergers 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 SPS Required Statutory Approv-
   als, the PSCo Required Statutory Approvals and all other approvals and
   authorizations of any Governmental Authorities necessary or advisable to
   consummate the transactions contemplated hereby.

               (b)   SPS and PSCo shall be responsible for the taking of any
   action necessary or advisable to obtain the SPS Required Statutory Approv-
   als and to obtain the PSCo Required Statutory Approvals, respectively. 
   SPS and PSCo 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 under state
   "blue sky" or securities laws.  SPS and PSCo shall each provide the other
   with copies of any filings made with any Governmental Authorities in
   connection with the foregoing.

               (c)   It may be preferable to effectuate a business combina-
   tion between PSCo and SPS by means of an alternative structure in light of
   the conditions set forth in Sections 8.1(e), 8.2(f) and 8.3(f). 
   Accordingly, if the only conditions to the parties' obligations to
   consummate the Mergers that are not satisfied or waived are receipt of any
   one or more of the PSCo Required Consents, PSCo Statutory Approvals, SPS

                                        45
<PAGE>

   Required Consents and SPS Statutory Approvals, and the adoption of an
   alternative structure (that otherwise substantially preserves for PSCo and
   SPS the economic benefits of the Mergers) would result in such conditions
   being satisfied or waived, then the parties shall use their respective
   best efforts to effect a business combination among themselves by means of
   a mutually agreed upon structure other than the Mergers that so preserves
   such benefits; provided that prior to closing any such restructured
   transaction, all material third party and Governmental Authority decla-
   rations, filings, registrations, notices, authorizations, consents or
   approvals necessary for the effectuation of such alternative business
   combination shall have been obtained and all other conditions to the
   parties' obligations to consummate the Mergers, as applied to such
   alternative business combination, shall have been satisfied or waived.

               Section 7.19 Registration Rights.  Upon the receipt of a
   written notice within a period of three years after the Closing Date from
   an affiliate or affiliates of the Company requesting the Company to
   register, under the Securities Act, Company Common Stock received by such
   affiliate in the Mergers, the Company shall use its reasonable best
   efforts to cause the offering of all shares designated in such a request
   (the "Shares") to be registered, one time at the Company's expense and all
   other times at the expense of such affiliate, under the Securities Act and
   any state securities or Blue-Sky laws necessary to effect a resale of such
   Shares; provided that (i) no fewer than 20,000 Shares are to be registered
   pursuant to such a request; (ii) such shares are not immediately saleable
   in the open market at the time in the opinion of counsel for the holder
   pursuant to an exemption under the Securities Act without limitation as to
   the number of shares which may be sold, the price at which the shares may
   be sold or the ability of the purchaser of such shares to immediately
   resell them in the open market; and (iii) the Board of Directors has not
   determined, in its reasonable good faith judgment, that such registration
   and sale would materially interfere with any financing, acquisition,
   corporate reorganization or other material transaction involving the
   Company then under consideration.

               Section 7.20 Charter and By-Law Amendments.  Prior to the
   Closing:  (a) PSCo and SPS shall agree upon amendments to be effected to
   the Certificate of Incorporation of the Company, including to change the
   name of the Company to a name agreed upon by PSCo and SPS (the "Company
   Charter Amendments"), and the by-laws of the Company, and (b) the Company
   shall take all actions necessary so that the Company Charter Amendments
   and such amendments to the Company by-laws become effective no later than
   the Effective Time.


                                   ARTICLE VIII

                                    CONDITIONS

               Section 8.1  Conditions to Each Party's Obligation to Effect
   the Merger to Which it is Party.  The respective obligations of each party
   to effect the Merger to which it is party 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 SPS Shareholders' Approvals
   and the PSCo 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

                                        46
<PAGE>

   court preventing consummation of either or both of the Mergers shall have
   been issued and continuing in effect, and the Mergers 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 Company Common Stock
   issuable in the Mergers pursuant to Article II shall have been approved
   for listing on the NYSE upon official notice of issuance.

               (e)   Pooling.  Each of PSCo and SPS shall have received a
   letter of its independent public accountants, dated the Closing Date, in
   form and substance reasonably satisfactory to SPS and PSCo, respectively,
   stating that the Mergers will qualify as a pooling-of-interests
   transaction under GAAP and applicable SEC regulations.

               (f)   Statutory Approvals.  The PSCo Required Statutory
   Approvals, the SPS Required Statutory Approvals and the finding of the
   Texas Commission that the transactions contemplated by the Agreement are
   in the public interest 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 material adverse
   effect on the business, operations, properties, assets, condition
   (financial or otherwise), prospects or results of operations of PSCo or a
   material adverse effect on the business, operations, properties, assets,
   condition (financial or otherwise), prospects or results of operations of
   SPS.  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,
   and as to which all opportunities for rehearing are exhausted (whether or
   not any appeal thereof is pending).

               (g)   The number of shares of PSCo Common Stock and PSCo
   Preferred Stock held by Dissenting Holders shall not constitute in the
   aggregate more than 5% of the number of issued and outstanding shares of
   PSCo Common Stock and PSCo Preferred Stock taken together as a single
   class for this purpose.  The number of shares of SPS Common Stock and SPS
   Preferred Stock held by Dissenting Holders shall not in the aggregate
   constitute more than 5% of the number of issued and outstanding shares of
   SPS Common Stock and SPS Preferred Stock taken together as a single class
   for this purpose.

               Section 8.2  Conditions to Obligation of SPS to Effect the SPS
   Merger.  The obligation of SPS to effect the SPS Merger shall be further
   subject to the satisfaction, on or prior to the Closing Date, of the
   following conditions, except as may be waived by SPS in writing pursuant
   to Section 9.5:

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


                                        47
<PAGE>

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

               (c)   Closing Certificates.  SPS shall have received a
   certificate signed by the Chief Executive Officer and Chief Financial
   Officer of PSCo, 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)   PSCo Material Adverse Effect.  No PSCo 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 PSCo Material
   Adverse Effect.

               (e)   Tax Opinion.  SPS shall have received an opinion of
   counsel, in form and substance satisfactory to SPS, dated the Closing
   Date, which opinion may be based on appropriate representations of PSCo,
   SPS and the Company that are in form and substance reasonably satisfactory
   to such counsel, to the effect that the Mergers, taken together, will be
   treated as a non-taxable exchange described in Code section 351.

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

               (g)   Affiliate Certificates.  The Company shall have received
   a certificate dated the Closing Date from each person who is an affiliate
   of PSCo to the effect that:  (i) such person has no present plan or
   intention to transfer, sell or otherwise dispose of any Company Common
   Stock such person may receive as a result of the PSCo Merger; (ii) until
   such time as financial results covering at least thirty days of post-
   closing combined operations of SPS, PSCo and the Company have been
   published, such person shall not sell such Company Common Stock in any
   transaction, private or public, or in any other way reduce such person's
   risk relative to any Company Common Stock that such person receives as a
   result of the PSCo Merger, except to the extent permitted pursuant to SAB
   No. 76; (iii) any future disposition by such person of any Company Common
   Stock such person receives as the result of the PSCo Merger will be
   accomplished in accordance with Rule 145(d) under the Securities Act or as
   provided in Section 7.19; and (iv) such person agrees that appropriate
   legends shall be placed upon the certificates evidencing ownership of the
   Company Common Stock that such person receives as a result of the PSCo
   Merger.

               Section 8.3  Conditions to Obligation of PSCo to Effect the
   PSCo Merger.  The obligation of PSCo to effect the PSCo Merger shall be
   further subject to the satisfaction, on or prior to the Closing Date, of
   the following conditions, except as may be waived by PSCo in writing
   pursuant to Section 9.5:

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

               (b)   Representations and Warranties.  The representations and
   warranties of SPS set forth in this Agreement shall be true and correct in
   all material respects as of the date hereof and as of the Closing Date as


                                        48
<PAGE>

   if made on and as of the Closing Date, except as otherwise contemplated by
   this Agreement.

               (c)   Closing Certificates.  PSCo shall have received a
   certificate signed by the Chief Executive Officer and Chief Financial
   Officer of SPS, 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)   SPS Material Adverse Effect.  No SPS 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 SPS Material
   Adverse Effect.

               (e)   Tax Opinion.  PSCo shall have received an opinion of
   counsel, in form and substance satisfactory to PSCo, dated the Closing
   Date, which opinion may be based on appropriate representations of PSCo,
   SPS and the Company that are in form and substance reasonably satisfactory
   to such counsel, to the effect that the Mergers, taken together, will be
   treated as a non-taxable exchange described in Code section 351.

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

               (g)   Affiliate Certificates.  The Company shall have received
   a certificate dated the Closing Date from each person who is an affiliate
   of SPS to the effect that:  (i) such person has no present plan or
   intention to transfer, sell or otherwise dispose of any Company Common
   Stock such person may receive as a result of the SPS Merger; (ii) until
   such time as financial results covering at least thirty days of post-
   closing combined operations of SPS, PSCo and Sub have been published, such
   person shall not sell such Company Common Stock in any transaction,
   private or public, or in any other way reduce such person's risk relative
   to any Company Common Stock that such person receives as a result of the
   SPS Merger, except to the extent permitted pursuant to SAB No. 76; (iii)
   any future disposition by such person of any Company Common Stock such
   person receives as the result of the SPS Merger will be accomplished in
   accordance with Rule 145(d) under the Securities Act or as provided in
   Section 7.19; and (iv) such person agrees that appropriate legends shall
   be placed upon the certificates evidencing ownership of the Company Common
   Stock that such person receives as a result of the SPS Merger.


                                    ARTICLE IX

                        TERMINATION, AMENDMENT AND WAIVER

               Section 9.1  Termination.  This Agreement and the Merger
   Agreements 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
   PSCo and SPS;

               (b)   by PSCo or SPS, by written notice to the other, if the
   Effective Time shall not have occurred on or before December 31, 1996;
   provided, however, that such date shall automatically be extended to June
   30, 1997 if, on December 31, 1996:  (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

                                        49
<PAGE>

   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 PSCo or SPS, by written notice to the other party, if
   the PSCo Shareholders' Approvals shall not have been obtained at a duly
   held PSCo Special Meeting, including any adjournments thereof, or the SPS
   Shareholders' Approvals shall not have been obtained at a duly held SPS
   Special Meeting, including any adjournments thereof;

               (d)   by PSCo or SPS, if 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 either or both of the Mergers or causing a PSCo Material
   Adverse Effect or SPS Material Adverse Effect, or by any party hereto, if
   any court of competent jurisdiction in the United States or any State
   shall have issued an order, judgment or decree permanently restraining,
   enjoining or otherwise prohibiting either or both of the Mergers or
   causing a PSCo Material Adverse Effect or SPS Material Adverse Effect, and
   such order, judgment or decree shall have become final and nonappealable;

               (e)   by SPS, upon two days' prior notice to PSCo, if, as a
   result of a tender offer by a party other than PSCo or any of its
   affiliates or any written offer or proposal with respect to a merger, sale
   of a material portion of its assets or other business combination (each, a
   "Business Combination") by a party other than PSCo or any of its
   affiliates, the Board of Directors of SPS determines in good faith that
   the fiduciary obligations of such directors under applicable law require
   that such tender offer or other written offer or proposal be accepted;
   provided, however, that (i) the Board of Directors of SPS shall have been
   advised in a written, reasoned opinion by outside counsel 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 PSCo 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, SPS
   shall, and shall cause its respective financial and legal advisors to,
   negotiate with PSCo to make such adjustments in the terms and conditions
   of this Agreement as would enable SPS to proceed with the transactions
   contemplated herein; provided further, that PSCo and SPS acknowledge and
   affirm that, notwithstanding anything in this Section 9.1(e) to the
   contrary, PSCo and SPS 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 Business Combination, it being
   acknowledged and agreed that any such offer or proposal would interfere
   with the strategic advantages and benefits that PSCo and SPS expect to
   derive from the Mergers and other transactions contemplated hereby;

               (f)   by PSCo, upon two days' prior notice to SPS, if, as a
   result of a tender offer by a party other than SPS or any of its
   affiliates or any written offer or proposal with respect to a Business
   Combination by a party other than SPS or any of its affiliates, the Board
   of Directors of PSCo determines in good faith that the fiduciary
   obligations of such directors under applicable law require that such
   tender offer or other written offer or proposal be accepted; provided,

                                        50
<PAGE>

   however, that (i) the Board of Directors of PSCo shall have been advised
   in a written, reasoned opinion by outside counsel 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 SPS 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, PSCo shall, and shall
   cause its respective financial and legal advisors to, negotiate with SPS
   to make such adjustments in the terms and conditions of this Agreement as
   would enable PSCo to proceed with the transactions contemplated herein;
   provided further, that PSCo and SPS acknowledge and affirm that,
   notwithstanding anything in this Section 9.1(f) to the contrary, PSCo and
   SPS 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 Business Combination, it being acknowledged and
   agreed that any such offer or proposal would interfere with the strategic
   advantages and benefits that PSCo and SPS expect to derive from the
   Mergers and other transactions contemplated hereby;

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

               (h)   by PSCo, by written notice to SPS, if (i) there exist
   breaches of the representations and warranties of SPS made herein as of
   the date hereof which breaches, individually or in the aggregate, would or
   would be reasonably likely to result in a SPS Material Adverse Effect, and
   such breaches shall not have been remedied within twenty (20) days after
   receipt by PSCo of notice in writing from PSCo, specifying the nature of
   such breaches and requesting that they be remedied, (ii) PSCo (and/or its
   appropriate subsidiaries) shall not have performed and complied with its
   agreements and covenants contained in Section 6.2 (Dividends), 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
   with shall not have been remedied within twenty (20) days after receipt by
   SPS of a notice in writing from PSCo, specifying the nature of such
   failure and requesting that it be remedied; or (iii) the Board of
   Directors of SPS or any committee thereof (A) shall withdraw or modify in

                                        51
<PAGE>

   any manner adverse to PSCo its approval or recommendation of this
   Agreement or the SPS Merger, (B) shall fail to reaffirm such approval or
   recommendation upon PSCo's request, (C) shall approve or recommend any
   acquisition of SPS or a material portion of SPS's assets or any tender
   offer for shares of capital stock of SPS, in each case, by a party other
   than PSCo or any of its affiliates or (D) shall resolve to take any of the
   actions specified in clause (A), (B) or (C).


               Section 9.2  Effect of Termination.  In the event of
   termination of this Agreement by either PSCo or SPS pursuant to Section
   9.1, there shall be no liability on the part of either PSCo or SPS or
   their respective officers or directors hereunder, except that Section 7.17
   and Section 9.3 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 and the
   Merger Agreements are terminated pursuant to one (but not both) of Section
   9.1(g)(i), (ii) or (iii) or Section 9.1(h)(i), (ii) or (iii), then (i) the
   breaching party or the withdrawing or modifying party (the "Nonterminating
   Party") shall promptly (but not later than five 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 Mergers or the transactions contemplated
   by this Agreement) not to exceed $10 million in the aggregate ("Out-of-
   Pocket Expenses") in the form provided in Section 9.3(e); provided,
   however, that, if this Agreement is terminated by a party as a result of a
   willful breach or failure to perform or comply with agreements and
   covenants by the Nonterminating Party (including without limitation the
   actions set forth in Section 9.1(g)(iii) and 9.1(h)(iii)), the
   Nonterminating Party shall promptly (but not later than five business days
   after receipt of notice of the amount due from the other party) pay to
   such terminating party an additional $35 million in the form provided in
   Section 9.3(e).

               (b)   Expenses Payable upon Acceptance of a Proposal.  If this
   Agreement and the Merger Agreements are terminated pursuant to one of
   Section 9.1(e) or Section 9.1(f) but not the other on the basis of a good
   faith determination made as provided in such Section 9.1(e) or Section
   9.1(f) that the fiduciary obligations of the directors of the terminating
   party under applicable law require acceptance of a tender offer or other
   written offer or proposal with respect to a Business Combination and such
   terminating party (or an affiliate thererof) enters into an agreement
   (whether or not such agreement is embodied in a definitive manner) to
   consummate a Business Combination with the third party that made such
   proposal or with a subsidiary or affiliate thereof within one year of such
   termination, then the terminating party shall promptly (but not later than
   five business days after receipt of notice of the amount due from the
   other party), but prior to entering into such agreement with the third
   party, pay to the other party an amount equal to Out-of-Pocket Expenses
   plus $35 million in the form provided in Section 9.3(e).

               (c)   Termination Fee In Certain Other Events.  If:  (i) this
   Agreement and the Merger Agreements are terminated (x) pursuant to Section
   9.1(g)(i), (ii) or (iii), Section 9.1(h)(i), (ii) or (iii), Section 9.1(b)
   or Section 9.1(d), (y) following a failure of the shareholders of SPS or

                                        52
<PAGE>

   PSCo to grant the necessary approvals described in Section 4.13 and
   Section 5.13, as the case may be (a "Shareholder Disapproval"), or (z) as
   a result of a material breach of Section 7.4; (ii) at the time of such
   termination (or, in the case of any termination following a Shareholder
   Disapproval, prior to the shareholder meeting at which such Shareholder
   Disapproval occurred), there shall have been a third-party tender offer
   for shares of, or a third-party offer or proposal with respect to a
   Business Combination involving, SPS or PSCo (as the case may be, the
   "Target Party") or the affiliates thereof which, at the time of such
   termination (or of the meeting of the Target Party's shareholders, as the
   case may be) shall not have been (A) rejected by the Target Party and its
   Board of Directors and (B) withdrawn by the third party, then promptly
   (but not later than five business days after receipt of notice of the
   amount due from the other party) after the termination of this Agreement
   (1) if PSCo is the Target Party, PSCo shall pay to SPS a termination fee
   equal to $35 million plus Out-of-Pocket Expenses in the form provided in
   Section 9.3(e) and (2) if SPS is the Target Party, SPS shall pay to PSCo a
   termination fee equal to $35 million plus Out-of-Pocket Expenses in the
   form provided in Section 9.3(e); provided, however, that 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).  

               (d)   Additional Termination Fee.  If Section 9.3 (a), (b) or
   (c) is applicable and if any Business Combination involving the Target
   Party (or any affiliate thereof) is accepted within one year of the
   termination of this Agreement and is consummated within two and one-half
   years from the date of the acceptance of such Business Combination by the
   Target Party (or such affiliate), if PSCo is the Target Party, PSCo shall
   pay to SPS and if SPS is the Target Party, SPS shall pay to PSCo, an
   additional $25 million in the form provided in Section 9.3(e).

               (e)   All payments made pursuant to Section 9.3, other than
   payments for Out-of-Pocket Expenses shall be payable in shares of PSCo
   Common Stock or SPS Common Stock, as the case may be, the aggregate fair
   market value (as defined below) of which shall equal the amount due;
   provided, however, that if such stock cannot, in the opinion of the
   payor's counsel, be legally and validly issued within six months from the
   date of the receipt of notice of the amount due for the payee, such
   payments shall be made in cash.  If such opinion is issued by the payor's
   counsel, the payor shall use its best efforts to ensure that the stock is
   issued to the payee.  In the event, that notwithstanding the fact that an
   opinion was obtained from the payor's counsel, the stock of the payor has
   not been issued to the payee during the six month period provided for
   above, all amounts owed pursuant to Section 9.3 shall become immediately
   due and payable in cash.  For the purposes of Section 9.3, the fair market
   value of the PSCo Common Stock or the SPS Common Stock, as the case may
   be, shall be the average closing price during the twenty trading day
   period prior to the date of the written notice from the payee.

               (f)   The holder of any stock issued pursuant to Section 9.3
   shall have the right, during the three year period from the date of
   issuance, to require the issuer to effect the registration of such stock
   under the Securities Act and the issuer shall use its reasonable best
   efforts to effect such registration; provided that (i) only one such
   registration shall be at the issuer's expense, (ii) such shares are not
   immediately saleable in the open market at the time in the opinion of
   counsel for the holder pursuant to an exemption under the Securities Act
   without limitation as to the number of shares which may be sold, the price
   at which the shares may be sold or the ability of the purchaser of such
   shares to immediately resell them in the open market, (iii) the Board of
   Directors has not determined, in its good faith judgment, that such

                                        53
<PAGE>

   registration and sale would materially interfere with any financing,
   acquisition, corporate reorganization or other material transaction
   involving the issuer then under consideration, and (iv) the issuer shall
   have the right to delay for up to 120 days any request for registration
   hereunder if the issuer intends to proceed with a registration to be sold
   by the issuer.  In the event of a delay in the sales of the shares
   pursuant to clause (iii) or (iv) of this Section 9.3(f), the period in
   which the holder shall have a right to require registration shall be
   extended by the amount of the delay.

               (g)   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 the Merger Agreements 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 Bank of America
   National Trust and Savings Association in effect from time to time from
   the date such fee was required to be paid.

               (h)   Limitation of Fees.  Notwithstanding anything herein to
   the contrary, the aggregate amount payable by PSCo and its affiliates
   pursuant to Section 9.3(a), Section 9.3(b), Section 9.3(c) and Section
   9.3(d) shall not exceed $60 million (excluding Out-of-Pocket Expenses) and
   the aggregate amount payable by SPS and its affiliates pursuant to Section
   9.3(a), Section 9.3(b), Section 9.3(c) and Section 9.3(d) shall not exceed
   $60 million (excluding Out-of-Pocket Expenses).

               Section 9.4  Amendment.  This Agreement and the Merger
   Agreements may be amended by the parties hereto or thereto pursuant to
   action of the respective Boards of Directors of each of PSCo and SPS, at
   any time before or after approval hereof by the shareholders of PSCo and
   SPS 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 exchange and/or conversion under Article
   II, (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 PSCo Common Stock
   or SPS Common Stock or (c) alter or change any term of the certificate of
   incorporation of the Company, except for alterations or changes that could
   otherwise be adopted by the Board of Directors of the Company, without the
   further approval of such shareholders, as applicable.  Neither this
   Agreement nor either of the Merger Agreements may be amended except by an
   instrument in writing signed on behalf of each of the parties hereto or
   thereto.

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


                                        54
<PAGE>

                                    ARTICLE X

                                GENERAL PROVISIONS

               Section 10.1  Non-Survival of Representations, Warranties,
   Covenants and Agreements.  All representations, warranties, covenants and
   agreements in this Agreement shall not survive the Mergers, except the
   covenants and agreements contained in this Section 10.1 and in Article II
   (Treatment of Shares), the second to the last sentence of Section 7.1
   (Access to Information), Section 7.5 (Directors' and Officers'
   Indemnification), Section 7.9 (Employee Agreements and Workforce Matters),
   Section 7.10 (Employee Benefit Plans), Section 7.11 (Incentive, Stock and
   Other Plans), Section 7.13 (Company Board of Directors), Section 7.14
   (Company Officers), Section 7.15 (Employment Contracts), Section 7.16
   (Corporate Offices), Section 7.17 (Expenses) and Section 10.7 (Parties in
   Interest), each of which shall survive in accordance with its terms.

               Section 10.2  Brokers.  PSCo represents and warrants that,
   except for Barr Devlin Associates, its investment banking firm, no broker,
   finder or investment banker is entitled to any brokerage, finder's or
   other fee or commission in connection with the Mergers or the transactions
   contemplated by this Agreement based upon arrangements made by or on
   behalf of PSCo.  SPS represents and warrants that, except for Dillon, Read
   & Co. Inc., its investment banking firm, no broker, finder or investment
   banker is entitled to any brokerage, finder's or other fee or commission
   in connection with the Mergers or the transactions contemplated by this
   Agreement based upon arrangements made by or on behalf of SPS.

               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 days after being mailed by registered or certified
   mall (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 SPS, to:

                     Southwestern Public Service Company
                     Tyler at Sixth
                     Amarillo, Texas  79101
                     Attention:  Bill D. Helton

                     with a copy to:

                     Cahill Gordon & Reindel
                     80 Pine Street
                     New York, New York  10005
                     Attention:  Gary W. Wolf, Esq.

               (ii)  If to PSCo, to:

                     Public Service Company of Colorado
                     1227 Seventeenth Street
                     Denver, Colorado  80202
                     Attention:  D. D. Hock

                     with a copy to:

                     LeBoeuf, Lamb, Greene & MacRae, L.L.P.

                                        55
<PAGE>

                     125 West 55th Street
                     New York, New York  10019
                     Attention:  Douglas W. Hawes, Esq.
                                 Steven H. Davis, 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 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 New York 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 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. 
   Notwithstanding the foregoing and any other provision of this Agreement,
   and in addition to any other required action of the Board of Directors of
   the Company, (a) a majority of the SPS Designees (or their successors)
   serving on the Board of Directors of the Company who are designated by SPS
   pursuant to Section 7.13 (Company Board of Directors) shall be entitled
   during the four and one-half year period commencing at the Effective Time
   (the "Applicable Period") to enforce the provisions of Section 7.9
   (Employee Agreements and Workforce Matters), Section 7.10 (Employee
   Benefit Plans), Section 7.11 (Incentive, Stock and Other Plans), and
   Section 7.15 (Employment Contracts) on behalf of the SPS officers,
   directors and employees, as the case may be, and (b) a majority of the
   PSCo Designees (or their successors) serving on the Board of Directors of
   the Company who are designated by PSCo pursuant to Section 7.13 (Company
   Board of Directors) shall be entitled during the Applicable Period to
   enforce the provisions of Section 7.9 (Employee Agreements and Workforce
   Matters), Section 7.10 (Employee Benefit Plans), Section 7.11 (Incentive,
   Stock and Other Plans) and Section 7.15 (Employment Contracts) on behalf
   of the PSCo officers, directors and employees, as the case may be.  Such

                                        56
<PAGE>

   directors' rights and remedies under the preceding sentence are cumulative
   and are in addition to any other rights and remedies they may have at law
   or in equity, but in no event shall this Section 10.7 be deemed to impose
   any additional duties on any such directors.  The Company shall pay, at
   the time they are incurred, or shall advance upon reasonable request, all
   reasonable costs, fees and expenses of such directors incurred in
   connection with the assertion of any rights or remedies on behalf of any
   of the persons set forth above pursuant to this Section 10.7.  For
   purposes of this Section 10.7 and Section 7.13 (Company Board of
   Directors), a "SPS Designee" or "PSCo Designee", as the case may be, shall
   at any time mean a person who at such time is a member of the Board of
   Directors of the Company who either (i) was designated a member of the
   Board of Directors of the Company by SPS or by PSCo, as the case may be,
   pursuant to Section 7.13(a) or (ii) was designated (before his or her
   initial election as a member of the Board of Directors of the Company) as
   a "SPS Designee" or a "PSCo Designee" by a majority of the then SPS
   Designees or PSCo Designees, as the case may be.

               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 or any state
   having jurisdiction, this being in addition to any other remedy to which
   they are entitled at law or in equity.


                                        57
<PAGE>

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

                                 PUBLIC SERVICE COMPANY OF COLORADO

                                 /s/  D. D. Hock
                           By____________________________________________
                               Name:  D. D. Hock
                               Title: Chairman and Chief Executive Officer


                                 SOUTHWESTERN PUBLIC SERVICE COMPANY

                                 /s/  Bill D. Helton
                           By____________________________________________
                               Name:  Bill D. Helton
                               Title: Chairman and Chief Executive Officer


                           M-P NEW CO.

                                 /s/  Doyle R. Bunch, II
                           By ____________________________________________
                               Name:  Doyle R. Bunch, II
                               Title: Chairman and Secretary


                                     /s/ Richard C. Kelly
                           And By ________________________________________
                                  Name:  Richard C. Kelly
                                  Title: President and Treasurer


                                        58
<PAGE>

                                                                    EXHIBIT A 

                                  PLAN OF MERGER


               PLAN OF MERGER (the "Plan of Merger"), dated as of _________,
   199_, by and among Public Service Company of Colorado, a Colorado
   corporation, ("PSCO"), [M-P New Co.], a Delaware corporation (the
   "Company") and PSCO Merger, Inc., a Colorado corporation and wholly owned
   subsidiary of the Company ("Merger Sub A").  The parties to this Plan of
   Merger are hereinafter sometimes collectively referred to as the
   "Constituent Corporations".

               WHEREAS, Merger Sub A is a corporation duly organized, validly
   existing and in good standing under the laws of the State of Colorado.  As
   of the date hereof the outstanding capital stock of Merger Sub A consisted
   solely of [            ] shares of common stock, par value $[     ] per
   share ("Merger Sub A Common Stock");

               WHEREAS, PSCO is a corporation duly organized, validly
   existing and in good standing under the laws of the State of Colorado.  As
   of the date hereof the authorized capital stock of PSCO consisted solely
   of 140,000,000 shares of common stock, par value $5 per share (the "PSCO
   Common Stock"), of which [            ] shares were outstanding on
   ___________, __, 199_, 4,000,000 shares of Cumulative Preferred Stock, par
   value $25 per share (the "PSCO $25 Preferred Stock"), of which [           
   ] shares were outstanding on   _________ __, 199_, and 3,000,000 shares of
   Cumulative Preferred Stock, par value $100 per share (the "PSCO $100
   Preferred Stock" and, together with the PSCO $25 Preferred Stock, the
   "PSCO Preferred Stock"), of which [             ] shares were outstanding
   on _________ __, 199_; and

               WHEREAS, PSCO, [Plain], a New Mexico corporation, and the
   Company have entered into an Agreement and Plan of Reorganization dated as
   of August __, 1995, setting forth representations, warranties, covenants,
   conditions and other terms in connection with the merger of equals and
   other transactions contemplated thereby and hereby (the "Reorganization
   Agreement").

               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.  In accordance with the provisions
   of this Plan of Merger and the Colorado Business Corporation Act (the
   "CBCA"), at the Effective Time (as defined in Section 1.2 hereof), Merger
   Sub A shall be merged with and into PSCO (the "Merger") and the separate
   corporate existence of Merger Sub A shall cease.  PSCO shall be the
   surviving corporation in the Merger (sometimes hereinafter referred to as
   the "Surviving Corporation") and shall continue its corporate existence
   under the laws of the State of Colorado.  The name of the Surviving
   Corporation shall continue to be "Public Service Company of Colorado". 
   The Merger shall have the effects set forth in the CBCA.  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 CBCA; the Surviving Corporation shall then
   and thereafter possess all the rights, privileges, immunities, and
<PAGE>

   franchises, of a public as well as of a private nature, of each of Merger
   Sub A and PSCO; 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 Merger Sub A and PSCO so merged
   shall be taken and deemed to be transferred to and 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 Merger
   Sub A and PSCO so merged.  In addition, any reference to either of the
   merging corporations in any contract, instrument or document, whether
   executed or taking effect before or after the Effective Time, shall be
   considered a reference to the Surviving Corporation if not inconsistent
   with the other provisions of the contract, instrument or document.

               Section 1.2      Effective Time; Conditions.  The Merger shall
   be effective (the "Effective Time") upon delivery of a copy of the
   Articles of Merger with the Secretary of State for the State of Colorado
   pursuant to Section 7-111-105 of the CBCA.  If the Reorganization
   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 Reorganization Agreement are satisfied or
   (where permissible) waived, and this Plan of Merger is not terminated
   under Section 3.1 hereof, articles of merger complying with Section 7-111-
   105 of the CBCA shall be delivered to the Secretary of State of the State
   of Colorado in accordance with Section 7-111-105 of the CBCA.

               Section 1.3      Articles of Incorporation and By-Laws.  The
   Articles of Incorporation (the "Articles") and By-laws of PSCO following
   the Effective Time shall be such Articles and By-Laws of PSCO as are in
   effect immediately prior to the Effective Time.

               Section 1.4      Directors and Officers.  (a)  The following
   persons shall be the initial directors of the Surviving Corporation until
   their respective successors are duly elected and qualified:


                                   [LIST NAMES]


               (b)   The following persons shall, form and after the
   Effective Time, be the officers of the Surviving Corporation, to serve in
   accordance with the By-laws thereof, until their respective successors are
   duly elected or appointed and qualified or until their earlier death,
   resignation or removal in accordance with the Surviving Corporation's
   Articles of Incorporation and By-Laws:

                                   [LIST NAMES]



                                   ARTICLE II.

                               CONVERSION OF SHARES

               Section 2.1      Conversion of Shares.  At the Effective Time,
   by virtue of the Merger and without any action on the part of PSCO, Merger
   Sub A or the holder of any securities of PSCO or Merger Sub A:

               (a)   PSCO Common Stock.  Each share of PSCO Common Stock
   which shall be outstanding immediately before the Effective Time (other
   than shares with respect to which the holder thereof has properly
   perfected dissenters rights) shall be converted into [            ]
   share[s] of common stock, par value $[     ] per share, of the Company,
   and PSCO shall thereafter be a wholly owned subsidiary of the Company.
<PAGE>

               (b)   PSCO Preferred Stock.  Each share of PSCO $25 Preferred
   Stock and each share of PSCO $100 Preferred Stock which shall be
   outstanding immediately before the Effective Time (other than shares with
   respect to which the holder thereof has properly perfected dissenters
   rights) shall remain outstanding as a share of preferred stock of the
   Surviving Corporation.

               (c)   Merger Sub A Common Stock.  Each share of Merger Sub A
   Common Stock which shall be outstanding immediately before the Effective
   time shall be converted into one share of the Surviving Corporation (the
   "Surviving Corporation Common Stock").  Each certificate which immediately
   before the Effective Time represented outstanding shares of Merger Sub A
   Common Stock shall, on and after the Effective Time, be deemed for all
   purposes to represent the number of shares of Surviving Corporation Common
   Stock into which the shares of Merger Sub A Common Stock represented by
   such certificate shall have been converted pursuant to this Section
   2.1(c).

               Section 2.2      Exchange of PSCO Common Stock Certificates.

               (a)   Deposit with Exchange Agent.  As soon as practicable
   after the Effective Time, the Company shall deposit with a bank, trust
   company or other agent ("Exchange Agent") certificates representing shares
   of Company Common Stock required to effect the conversion of PSCO Common
   Stock into Company Common Stock referred to in Section 2.1(a).

               (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 which immediately prior to the Effective
   Time represented issued and outstanding shares of PSCO Common Stock
   ("Certificates") that were converted ("Converted Shares") into the right
   to receive shares of Company Common Stock ("Company 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
   deliver of the Certificates to the Exchange Agent) and (ii) instructions
   for use in effecting the exchange of Certificates for certificates
   representing Company 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,
   the holder of such Certificate shall be entitled to receive in exchange
   therefor a certificate representing that number of whole Company Shares
   and the amount of cash in lieu of fractional share interests 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 Converted Shares which is
   not registered in the transfer records of PSCO, a certificate to a
   transferee if the Certificate representing such Converted Shares is
   presented to the Exchange Agent, accompanied by all documents required to
   evidence and effect such transfer and by 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
   shall be deemed at any time after the Effective Time to represent only the
   right to receive upon such delivery the certificate representing Company
   Shares and cash in lieu of any fractional shares of Company 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 Company Shares with a record date after the Effective Time
   shall be paid to the holder of any undelivered Certificate with respect to
   the Company 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 a transferee as
   described in Section 2.2(b)) shall have delivered such Certificate as
<PAGE>

   contemplated in Section 2.2(b).  Subject to the effect of unclaimed
   property, escheat and other applicable laws, following delivery of any
   such Certificate, there shall be paid to the record holder (or transferee)
   of the certificates representing whole Company 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 Company 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
   Company 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 and payment date subsequent to delivery payable
   with respect to such whole Company Shares, as the case may be.

               (d)   No Fractional Shares.  (i) No certificates or scrip
   representing fractional shares of Company Common Stock shall be issued
   upon the delivery for exchange of Certificates, and such fractional share
   interests will not entitle the owner thereof to vote or to any rights of a
   shareholder of the Company.

                     (ii)  As promptly as practicable following the Effective
   Time, the Exchange Agent shall determine the excess of (x) the number of
   full shares of Company Common Stock delivered to the Exchange Agent by the
   Company pursuant to Section 2.2(a) of the Reorganization Agreement over
   (y) the aggregate number of full shares of Company Common Stock to be
   distributed to holders of PSCO Common Stock and Plain Common Stock(as
   defined in the Reorganization Agreement) pursuant to Section 2.2(b) of the
   Reorganization Agreement (such excess being herein called the "Excess
   Shares").  As soon after the Effective Time as practicable, the Exchange
   Agent, as agent for the holders of the Excess Shares at then prevailing
   prices on the New York Stock Exchange ("NYSE"), all in the manner provided
   in Section 2.2(d)(iii).

                     (iii)  The sale of the Excess shares by the Exchange
   Agent shall be executed on they NYSE through one or more member firms of
   the NYSE and shall be executed in round lots to the extent practicable. 
   Until the proceeds of such sale or sales have been distributed to the
   holders of PSCO Common Stock and Plain Common Stock, the Exchange Agent
   shall, until remitted pursuant to Section 2.2(f), hold such proceeds in
   trust for the holders of PSCO Common Stock and Plain Common Stock ("Common
   Shares Trust").  The Company shall pay all commissions, transfer taxes and
   other out-of-pocket transaction costs, including the expenses and
   compensation, of the Exchange Agent incurred in connection with such sale
   of the Excess Shares.  The Exchange Agent shall determine the portion of
   the proceeds comprising the Common Shares Trust to which each holder of
   PSCO Common Stock shall be entitled, if any, by multiplying the amount of
   the aggregate proceeds comprising the Common Shares Trust by a fraction
   the numerator of which is the amount of the fractional share interest to
   which such holder of PSCO Common Stock is entitled and the denominator of
   which is the aggregate amount of fractional share interests to which all
   holders of PSCO Common Stock and Plain Common Stock are entitled.

                     (iv)  As soon as practicable after the sale of Excess
   Shares pursuant to clause (iii) above and the determination of the amount
   of cash, if any, to be paid to holders of PSCO Common Stock in lieu of any
   fractional share interests, the Exchange Agent shall distribute such
   amounts to holders of PSCO Common Stock who have theretofore delivered
   Certificates for PSCO Common Stock for exchange pursuant to this Article
   II.

               (e)   Closing of Transfer Books.  From and after the Effective
   Time, the stock transfer books of PSCO with respect to shares of PSCO
   Common Stock, issued and outstanding prior to the Effective Time shall be
<PAGE>

   closed and no transfer of any shares shall thereafter be made.  If, after
   the Effective Time, Certificates are presented to the Company, they shall
   be cancelled and exchanged for certificates representing the appropriate
   number of whole Company Shares and cash in lieu of fractional shares of
   Company Common Stock as provided in this Section 2.2.

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


                                   ARTICLE III.

                            TERMINATION AND AMENDMENT

               Section 3.1      Termination.  Notwithstanding the approval and
   adoption of this Plan of Merger by the shareholders of PSCO, the Company
   and Merger Sub A, this Plan of Merger shall terminate forthwith in the
   event that the Reorganization Agreement shall be terminated as therein
   provided and may be terminated as otherwise provided in the Reorganization
   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 Reorganization 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
   Reorganization Agreement.


                                   ARTICLE IV.

                                  MISCELLANEOUS

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

               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 merging corporations are each authorized by it in its name to
   execute and deliver or cause to be executed and delivered any articles 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.
<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.



                                   PUBLIC SERVICE COMPANY OF COLORADO


                                   By: _____________________________________


                                   PSCO MERGER, INC.


                                   By:  ____________________________________


                                   [M-P NEW CO.]


                                   By:  ____________________________________
<PAGE>

                                                       EXHIBIT B 

                           PLAN OF MERGER


             PLAN OF MERGER (the "Plan of Merger"), dated as of
   __________ __, 199_, by and among Southwestern Public Service
   Company, a New Mexico corporation, ("SPS"), M-P New Co., a
   Delaware corporation (the "Company") and SPS Merger, Inc., a
   New Mexico corporation and wholly owned subsidiary of the
   Company ("Merger Sub B").  The parties to this Plan of Merger
   are hereinafter sometimes collectively referred to as the
   "Constituent Corporations".

             WHEREAS, Merger Sub B is a corporation duly
   organized, validly existing and in good standing under the
   laws of the State of New Mexico.  As of the date hereof the
   outstanding capital stock of Merger Sub B consisted solely of
   [             ] shares of common stock, par value $[     ] per
   share ("Merger Sub B Common Stock");

             WHEREAS, Southwestern Public Service Company is a
   corporation duly organized, validly existing and in good
   standing under the laws of the State of New Mexico.  As of the
   date hereof the authorized capital stock of SPS consisted
   solely of 100,000,000 shares of common stock, par value $1 per
   share (the "SPS Common Stock"), of which [             ]
   shares were outstanding on __________, __, 199_, 3,000,000
   shares of Cumulative Preferred Stock, par value $25 per share
   (the "SPS $25 Preferred Stock"), of which [          ] shares
   were outstanding on __________ __, 199_, and 2,000,000 shares
   of Cumulative Preferred Stock, par value $100 per share (the
   "SPS $100 Preferred Stock" and, together with the SPS $25
   Preferred Stock, the "SPS Preferred Stock"), of which [        
       ] shares were outstanding on ___________ __, 199_; and

             WHEREAS, SPS, Mountain, a Colorado corporation, and
   the Company have entered into an Agreement and Plan of
   Reorganization dated as of August __, 1995, setting forth
   representations, warranties, covenants, conditions and other
   terms in connection with the merger of equals and other
   transactions contemplated thereby and hereby (the
   "Reorganization Agreement").

             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.  In accordance with the
   provisions of this Plan of Merger and the New Mexico Business
   Corporation Act (the "NMBCA"), at the Effective Time (as
   defined in Section 1.2 hereof), Merger Sub B shall be merged
   with and into SPS (the "Merger") and the separate corporate
   existence of Merger Sub B shall cease.  SPS shall be the
   surviving corporation in the Merger (sometimes hereinafter
   referred to as the "Surviving Corporation") and shall continue
   its corporate existence under the laws of the State of New
   Mexico.  The name of the Surviving Corporation shall continue
<PAGE>

   to be "Southwestern Public Service Company".  The Merger shall
   have the effects set forth in the NMBCA.  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 NMBCA; 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 Merger Sub B and SPS; 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 Merger Sub B and SPS so merged shall be
   taken and deemed to be transferred to and 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 Merger Sub B and SPS so
   merged.  In addition, any reference to either of the merging
   corporations in any contract, instrument or document, whether
   executed or taking effect before or after the Effective Time,
   shall be considered a reference to the Surviving Corporation
   if not inconsistent with the other provisions of the contract,
   instrument or document.

             Section 1.2  Effective Time; Conditions.  The
   Merger shall be effective (the "Effective Time") upon delivery
   of a copy of the Articles of Merger with the Secretary of
   State for the State of New Mexico pursuant to Section 53-14-4
   of the NMBCA.  If the Reorganization 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 Reorganization Agreement are
   satisfied or (where permissible) waived, and this Plan of
   Merger is not terminated under Section 3.1 hereof, articles of
   merger complying with Section 53-14-4 of the NMBCA shall be
   delivered to the Secretary of State of the State of New Mexico
   in accordance with Section 53-14-4 of the NMBCA.

             Section 1.3  Articles of Incorporation and By-Laws. 
   The Articles of Incorporation (the "Articles") and By-laws of
   SPS following the Effective Time shall be such Articles and
   By-Laws of SPS as are in effect immediately prior to the
   Effective Time.

             Section 1.4  Directors and Officers.  (a)  The
   following persons shall be the initial directors of the
   Surviving Corporation until their respective successors are
   duly elected and qualified:


                            [LIST NAMES]


             (b)  The following persons shall, form and after the
   Effective Time, be the officers of the Surviving Corporation,
   to serve in accordance with the By-laws thereof, until their
   respective successors are duly elected or appointed and
   qualified or until their earlier death, resignation or removal
   in accordance with the Surviving Corporation's Articles of
   Incorporation and By-Laws:

                            [LIST NAMES]
<PAGE>


                            ARTICLE II.

                        CONVERSION OF SHARES

             Section 2.1  Conversion of Shares.  At the
   Effective Time, by virtue of the Merger and without any action
   on the part of SPS, Merger Sub B or the holder of any
   securities of SPS nor Merger Sub B:

             (a)  SPS Common Stock.  Each share of SPS Common
   Stock which shall be outstanding immediately before the
   Effective Time (other than shares with respect to which the
   holder thereof has properly perfected dissenters rights) shall
   be converted into [           ] share[s] of common stock, par
   value $[     ] per share, of the Company, and SPS shall
   thereafter be a wholly owned subsidiary of the Company.

             (b)  SPS Preferred Stock.  Each share of SPS $25
   Preferred Stock and each share of SPS $100 Preferred Stock
   which shall be outstanding immediately before the Effective
   Time (other than shares with respect to which the holder
   thereof has properly perfected dissenters rights) shall remain
   outstanding as a share of preferred stock of the Surviving
   Corporation.

             (c)  Merger Sub B Common Stock.  Each share of
   Merger Sub B Common Stock which shall be outstanding
   immediately before the Effective time shall be converted into
   one share of the Surviving Corporation (the "Surviving
   Corporation Common Stock").  Each certificate which
   immediately before the Effective Time represented outstanding
   shares of Merger Sub B Common Stock shall, on and after the
   Effective Time, be deemed for all purposes to represent the
   number of shares of Surviving Corporation Common Stock into
   which the shares of Merger Sub B Common Stock represented by
   such certificate shall have been converted pursuant to this
   Section 2.1(c).

             Section 2.2  Exchange of SPS Common Stock
   Certificates.

             (a)  Deposit with Exchange Agent.  As soon as
   practicable after the Effective Time, the Company shall
   deposit with a bank, trust company or other agent ("Exchange
   Agent") certificates representing shares of Company Common
   Stock required to effect the conversion of SPS Common Stock
   into Company Common Stock referred to in Section 2.1(a).

             (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 which
   immediately prior to the Effective Time represented issued and
   outstanding shares of SPS Common Stock ("Certificates") that
   were converted ("Converted Shares") into the right to receive
   shares of Company Common Stock ("Company 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 deliver of the Certificates to
   the Exchange Agent) and (ii) instructions for use in effecting
   the exchange of Certificates for certificates representing
   Company Shares.  Upon delivery of a Certificate to the
   Exchange Agent for exchange, together with a duly executed
<PAGE>

   letter of transmittal and such other documents as the Exchange
   Agent shall require, the holder of such Certificate shall be
   entitled to receive in exchange therefor a certificate
   representing that number of whole Company Shares and the
   amount of cash in lieu of fractional share interests 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 Converted Shares which is not registered in the
   transfer records of SPS, a certificate to a transferee if the
   Certificate representing such Converted Shares is presented to
   the Exchange Agent, accompanied by all documents required to
   evidence and effect such transfer and by 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 shall be deemed at any time
   after the Effective Time to represent only the right to
   receive upon such delivery the certificate representing
   Company Shares and cash in lieu of any fractional shares of
   Company 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 Company Shares with a
   record date after the Effective Time shall be paid to the
   holder of any undelivered Certificate with respect to the
   Company 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 a transferee as described in Section 2.2(b))
   shall have delivered such Certificate 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, there shall be paid to the record holder (or
   transferee) of the certificates representing whole Company
   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 Company 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 Company 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 and payment date subsequent to delivery
   payable with respect to such whole Company Shares, as the case
   may be.

             (d)  No Fractional Shares.  (i) No certificates or
   scrip representing fractional shares of Company Common Stock
   shall be issued upon the delivery for exchange of
   Certificates, and such fractional share interests will not
   entitle the owner thereof to vote or to any rights of a
   shareholder of the Company.

                  (ii)  As promptly as practicable following the
   Effective Time, the Exchange Agent shall determine the excess
   of (x) the number of full shares of Company Common Stock
   delivered to the Exchange Agent by the Company pursuant to
   Section 2.2(a) of the Reorganization Agreement over (y) the
   aggregate number of full shares of Company Common Stock to be
   distributed to holders of SPS Common Stock and Mountain Common
   Stock(as defined in the Reorganization Agreement) pursuant to
   Section 2.2(b) of the Reorganization Agreement (such excess
<PAGE>

   being herein called the "Excess Shares").  As soon after the
   Effective Time as practicable, the Exchange Agent, as agent
   for the holders of the Excess Shares at then prevailing prices
   on the New York Stock Exchange ("NYSE"), all in the manner
   provided in Section 2.2(d)(iii).

                  (iii)  The sale of the Excess shares by the
   Exchange Agent shall be executed on they NYSE through one or
   more member firms of the NYSE and shall be executed in round
   lots to the extent practicable.  Until the proceeds of such
   sale or sales have been distributed to the holders of SPS
   Common Stock and Mountain Common Stock, the Exchange Agent
   shall, until remitted pursuant to Section 2.2(f), hold such
   proceeds in trust for the holders of SPS Common Stock and
   Mountain Common Stock ("Common Shares Trust").  The Company
   shall pay all commissions, transfer taxes and other out-of-
   pocket transaction costs, including the expenses and
   compensation, of the Exchange Agent incurred in connection
   with such sale of the Excess Shares.  The Exchange Agent shall
   determine the portion of the proceeds comprising the Common
   Shares Trust to which each holder of SPS Common Stock shall be
   entitled, if any, by multiplying the amount of the aggregate
   proceeds comprising the Common Shares Trust by a fraction the
   numerator of which is the amount of the fractional share
   interest to which such holder of SPS Common Stock is entitled
   and the denominator of which is the aggregate amount of
   fractional share interests to which all holders of SPS Common
   Stock and Mountain Common Stock are entitled.

                  (iv)  As soon as practicable after the sale of
   Excess Shares pursuant to clause (iii) above and the
   determination of the amount of cash, if any, to be paid to
   holders of SPS Common Stock in lieu of any fractional share
   interests, the Exchange Agent shall distribute such amounts to
   holders of SPS Common Stock who have theretofore delivered
   Certificates for SPS Common Stock for exchange pursuant to
   this Article II.

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

             (f)  Termination of Exchange Agent.  Any
   certificates representing Company Shares deposited with the
   Exchange Agent pursuant to Section 2.2(a) and not exchanged
   within one year after the Effective Time pursuant to this
   Section 2.2 shall be returned by the Exchange Agent to the
   Company, which shall thereafter act as Exchange Agent.  All
   funds held by the Exchange Agent for payment to the holders of
   undelivered Certificates and unclaimed at the end of one year
   from the Effective Time shall be remitted to the Company,
   after which time any holder of undelivered Certificates shall
   look as a general creditor only to the Company for payment of
   such funds to which such holder may be due, subject to
   applicable law.  The Company shall not be liable to any person
   for such shares or funds delivered to a public official
<PAGE>

   pursuant to any applicable abandoned property, escheat or
   similar law.


                            ARTICLE III.

                     TERMINATION AND AMENDMENT

             Section 3.1  Termination.  Notwithstanding the
   approval and adoption of this Plan of Merger by the
   shareholders of SPS, the Company and Merger Sub B, this Plan
   of Merger shall terminate forthwith in the event that the
   Reorganization Agreement shall be terminated as therein
   provided and may be terminated as otherwise provided in the
   Reorganization 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 Reorganization 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 Reorganization Agreement.


                            ARTICLE IV.

                           MISCELLANEOUS

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

             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 merging corporations are each
   authorized by it in its name to execute and deliver or cause
   to be executed and delivered any articles 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.
<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.



                             SOUTHWESTERN PUBLIC SERVICE COMPANY


                             By: _______________________________


                             SPS MERGER, INC.


                             By:  ______________________________


                             M-P NEW CO.


                             By:  ______________________________
<PAGE>

                                                                    EXHIBIT C 

                           Form of Affiliate Agreement


   Gentlemen:

         The undersigned is a holder of shares of Common Stock, par value
   $_____ per share ("Common Stock"), of ____________________, a __________
   corporation] (the "Company") and is entitled to receive in connection with
   the merger (the "Merger") of the Company with a subsidiary of M-P New Co.,
   a Delaware corporation ("Newco"), securities of Newco (the "Securities").

         The undersigned acknowledges that the undersigned may be deemed an
   "affiliate" of Newco within the meaning of Rule 145 ("Rule 145")
   promulgated under the Securities Act of 1933, as amended (the "Act"),
   and/or as such term is used in and for purposes of Accounting Series
   Releases 130 and 135, as amended, of the Securities and Exchange
   Commission (the "Commission"), although nothing contained herein shall be
   construed as an admission of such status.

         If in fact the undersigned were an affiliate of Newco under the Act,
   the undersigned's ability to sell, assign or transfer any Securities
   received by the undersigned in exchange for any shares of the Company
   pursuant to the Merger may be restricted unless such transaction is
   registered under the Act or an exemption from such registration is
   available.  The undersigned understands that such exemptions are limited
   and the undersigned has obtained advice of counsel as to the nature and
   conditions of such exemptions, including instruction with respect to the
   applicability to the sale of such Securities of Rules 144 and 145(d)
   promulgated under the Act.

         The undersigned hereby represents to and covenants to Newco that it
   will not sell, assign or transfer any Securities received by the
   undersigned in exchange for shares of the Common Stock pursuant to the
   Merger except (i) pursuant to an effective registration statement under
   the Act (including, without limitation, a registration pursuant to any
   registration rights granted to that certain Agreement and Plan of
   Reorganization dated as of August 22, 1995 by and among the Company, Newco
   and [PSCo or SPS, as the case may be] (the "Reorganization Agreement")),
   (ii) by a transaction in conformity with the volume and other limitations
   of Rule 145 or Rule 144, to the extent applicable, or any other applicable
   rules promulgated by the Commission or (iii) in a transaction which, in
   the opinion of independent counsel reasonably satisfactory to the Company,
   or as described in a "no-action" or interpretive letter from the Staff of
   the Commission, is not required to be registered under the Act.

         In the event of a sale of Securities pursuant to Rule 145, the
   undersigned will supply the Company with evidence of compliance with such
   Rule, in the form of customary seller's and broker's Rule 145
   representation letters or as Newco may otherwise reasonably request.  The
   undersigned understands that Newco may instruct its transfer agent to
   withhold the transfer of any Securities disposed of by the undersigned in
   a manner inconsistent with this letter.

         The undersigned acknowledges and agrees that appropriate legends
   will be placed on certificates representing Securities received by the
   undersigned in the Merger or held by a transferee thereof, which legends
   will be removed (i) by delivery of substitute certificates upon receipt of
   an opinion in form and substance reasonably satisfactory to Newco to the
   effect that such legends are no longer required for the purposes of the
   Act and the rules and regulations of the Commission promulgated thereunder
<PAGE>

   or (ii) in the event of a sale of the Securities which has been registered
   under the Act.

         The undersigned further represents to, and covenants with Newco and
   the Company that the undersigned will not, during the 30 days prior to the
   effective time of the Merger sell, transfer or otherwise dispose of, or
   reduce any risk relative to, any securities of the Company, [PSCo or SPS,
   as the case may be] or Newco, and the undersigned will not sell, transfer
   or otherwise dispose of, or reduce any risk relative to, the Securities
   received by the undersigned in the Merger or any other shares of the
   capital stock of Newco until after such time as results covering at least
   30 days of operations of Newco (including the combined operations of the
   Company and [PSCo or SPS, as the case may be]) or Newco have been
   published by Newco 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 results of operations.

         The undersigned acknowledges that it has carefully reviewed this
   letter and understands the requirements hereof and the limitations imposed
   upon the distribution, sale, transfer or other disposition of Securities. 
   Nothing contained herein shall be deemed to limit any registration rights
   granted to the undersigned pursuant to the Reorganization Agreement.

                                                   Very truly yours,



                                                   _________________________
                                                   [Name]





   Dated:

         As an inducement to the above individual to deliver this letter,
   Newco agrees that for so long as and to the extent necessary to permit
   such individual to sell the Securities pursuant to Rule 145 and, to the
   extent applicable, Rule 144 under the Act, Newco shall use all reasonable
   efforts to file, on a timely basis, all reports and data required to be
   filed by it with the Commission pursuant to Section 13 of the Securities
   and Exchange Act of 1934.

                                                   Very truly yours,

                                                   [NEWCO]



                                                   By:______________________
                                                    Name:
                                                    Title:
<PAGE>

                                                                    EXHIBIT D 









                               EMPLOYMENT AGREEMENT

                                  BILL D. HELTON
<PAGE>

                                TABLE OF CONTENTS

                                                                          PAGE

   Employment Period . . . . . . . . . . . . . . . . . . . . . . . . . .     1

   Position and Duties . . . . . . . . . . . . . . . . . . . . . . . . .     1

   Compensation  . . . . . . . . . . . . . . . . . . . . . . . . . . . .     2

   Termination of Employment . . . . . . . . . . . . . . . . . . . . . .     4

   Obligations of the Company upon Termination . . . . . . . . . . . . .     7

   Non-Exclusivity of Rights . . . . . . . . . . . . . . . . . . . . . .     9

   Full Settlement . . . . . . . . . . . . . . . . . . . . . . . . . . .     9

   Non-Competition Provision and Confidential Information  . . . . . . .     9

   Certain Additional Payments by the Company  . . . . . . . . . . . . .    10

   Attorneys' Fees . . . . . . . . . . . . . . . . . . . . . . . . . . .    12

   Successors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    12

   Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . .    13
<PAGE>


                               EMPLOYMENT AGREEMENT


         THIS AGREEMENT by and between M-P New Co., a Delaware corporation
   (the "Company"), and Bill D. Helton (the "Executive"), dated as of the __
   day of _________, 199__.


                                 WITNESSETH THAT

         WHEREAS, Public Service Company of Colorado, a Colorado corporation
   ("PSC") and Southwestern Public Service Company, a New Mexico corporation
   ("SPS") have entered into an Agreement and Plan of Reorganization dated as
   of August 22, 1995 (the "Reorganization Agreement"), whereby wholly owned
   subsidiaries of Company will merge into PSC and SPS; and

         WHEREAS, PSC and SPS wish to provide for the orderly succession of
   management of the Company following the Effective Time (as defined in the
   Reorganization Agreement the "Effective Time"); and

         WHEREAS, PSC and SPS further wish to provide for the employment by
   the Company of the Executive, and the Executive wishes to serve the
   Company, in the capacities and on the terms and conditions set forth in
   this Agreement;

         NOW, THEREFORE, it is hereby agreed as follows:

         1.    Employment Period.  The Company shall employ the Executive,
   and the Executive shall serve the Company, on the terms and conditions set
   forth in this Agreement, for an initial period (the "Initial Period") and
   a further period (the "Secondary Period") (the Initial Period and the
   Secondary Period are hereinafter referred to in the aggregate as the
   "Employment Period").  The Initial Period shall begin at the Effective
   Time (as defined in the Reorganization Agreement the "Effective Time") and
   end on the later of (i) June 30, 1999, or (ii) two and one-half (2 1/2)
   years from the Effective Time.  The Secondary Period shall begin on the
   first day after the end of the Initial Period and end on May 31, 2001.

         2.    Position and Duties.  

               (a)  During the Initial Period, the Executive shall serve as
   Chief Executive Officer of the Company and Chairman of the Board of
   Directors of the Company (the "Board").  During the Secondary Period, the
   Executive shall serve as Chairman of the Board.  The Executive shall serve
   in each such case as an employee of the Company and with such duties and
   responsibilities as are customarily assigned to such positions, and such
   other duties and responsibilities not inconsistent therewith as may from
   time to time be assigned to him by the Board.  The Executive shall be a
   member of the Board on the first day of the Employment Period, and the
   Board shall propose the Executive for re-election to the Board throughout
   the Employment Period.  

               (b)   During the Employment Period, and excluding any periods
   of vacation and sick leave to which the Executive is entitled, the
   Executive shall devote reasonable attention and time during normal
   business hours to the business and affairs of the Company and, to the
   extent necessary to discharge the responsibilities assigned to the
   Executive under this Agreement, use the Executive's reasonable best
   efforts to carry out such responsibilities faithfully and efficiently.  It
   shall not be considered a violation of the foregoing for the Executive to

                                        1
<PAGE>

   serve on corporate, industry, civic or charitable boards or committees, so
   long as such activities do not significantly interfere with the
   performance of the Executive's responsibilities as an employee of the
   Company in accordance with this Agreement.

               (c)   The Executive's services shall be performed primarily at
   the Company's headquarters in Denver, Colorado.

         3.    Compensation.  

               (a)  Base Salary.  The Executive's compensation during the
   Employment Period shall be determined by the Board upon the recommendation
   of the Compensation Committee of the Board, subject to the next sentence
   and Section 3(b).  During the Employment Period, the Executive shall
   receive an annual base salary ("Annual Base Salary") of not less than his
   annual base salary from SPS as in effect immediately before the Effective
   Time.  During the Initial Period, Executive shall be compensated by the
   Company and its subsidiaries at a level that is higher than the
   compensation from the Company and its subsidiaries received by any other
   executive officer of the Company.  The Annual Base Salary shall be payable
   in accordance with the Company's regular payroll practice for its senior
   executives, as in effect from time to time.  During the Employment Period,
   the Annual Base Salary shall be reviewed at least annually.  Any increase
   in the Annual Base Salary shall not limit or reduce any other obligation
   of the Company under this Agreement.  

               (b)   Incentive Compensation.  During the Employment Period,
   the Executive shall participate in short-term incentive compensation plans
   and long-term incentive compensation plans (the latter to consist of plans
   offering stock options, restricted stock and other long-term incentive
   compensation) providing him with the opportunity to earn, on a year-by-
   year basis, short-term and long-term incentive compensation (the
   "Incentive Compensation") at least equal to the greater of (i) the amounts
   that he had the opportunity to earn under the comparable plans of SPS as
   in effect immediately before the Effective Time, or (ii) the amounts that
   the next highest executive officer of the Company has the opportunity to
   earn under the plans of the Company and its subsidiaries for that year.

               (c)   Other Benefits.  

                     (i)  Supplemental Executive Retirement Plan.  During the
   Employment Period, the Executive shall participate in a supplemental
   executive retirement plan ("SERP") such that the aggregate value of the
   retirement benefits that he and his spouse will receive at the end of the
   Employment Period under all defined benefit plans of the Company and its
   affiliates (whether qualified or not) will be not less than the aggregate
   value of the benefits he and his spouse would have received (and with the
   same forms of benefit payments) had he continued, through the end of the
   Employment Period, to accrue the supplemental retirement benefits provided
   by the terms of the Supplemental Retirement Income Plan of SPS as in
   effect immediately before the Effective Time.  The Company shall maintain
   and fund one or more grantor trusts (the "Trusts"), or such other funding
   mechanism as may be satisfactory to the Executive, which shall comply with
   the following sentence and which shall at all times be adequate to provide
   for the payment of all benefits under the SERP to the Executive, as well
   as any elective deferrals by the Executive under any non-qualified plan
   (with such adequacy being determined by an independent consulting firm
   acceptable to the Executive, whose fees shall be paid by the Company). 
   The assets of the Trusts (if any) shall be subject to the claims of the
   Company's creditors, and the Trusts (if any) shall in all other respects
   be designed to prevent the Executive and his spouse from being taxed on

                                        2
<PAGE>

   the assets or income thereof, except as and when such assets or income are
   paid to them.

                     (ii)       During the Employment Period, the Company
   shall provide the Executive with life insurance coverage providing a death
   benefit to such beneficiary or beneficiaries as the Executive may
   designate of not less than two times his Annual Base Salary.  

                     (iii)      In addition, and without limiting the
   generality of the foregoing, during the Employment Period and thereafter: 
   (A) the Executive shall be entitled to participate in all applicable
   incentive, savings and retirement plans, practices, policies and programs
   of the Company and its subsidiaries to the same extent as other senior
   executives of the Company; and (B) the Executive and/or the Executive's
   family, as the case may be, shall be eligible for participation in, and
   shall receive all benefits under, all applicable welfare benefit plans,
   practices, policies and programs provided by the Company and its
   subsidiaries, other than severance plans, practices, policies and programs
   but including, without limitation, medical, prescription, dental,
   disability, sick leave, employee life insurance, group life insurance,
   accidental death and travel accident insurance plans and programs, to the
   same extent as other senior executives of the Company.

               (d)   Fringe Benefits.  During the Employment Period, the
   Executive shall be entitled to receive fringe benefits on the same terms
   and conditions as the greater of (i) the fringe benefits received by, or
   available to, him from SPS immediately before the Effective Time,
   including but not limited to, relocation assistance under SPS's Relocation
   Assistance Policy, or (ii) the fringe benefits provided by the Company or
   its subsidiaries which are available to the next highest executive officer
   of the Company for the year.

         4.    Termination of Employment. 

               (a)   Death or Disability.  The Executive's employment shall
   terminate automatically upon the Executive's death during the Employment
   Period.  The Company shall be entitled to terminate the Executive's
   employment because of the Executive's Disability during the Employment
   Period.  "Disability" means that (i) the Executive has been unable, for a
   period of 180 consecutive business days, to perform the Executive's duties
   under this Agreement, as a result of physical or mental illness or injury,
   and (i) a physician selected by the Company or its insurers, and
   acceptable to the Executive or the Executive's legal representative, has
   determined that the Executive's incapacity is total and permanent.  A
   termination of the Executive's employment by the Company for Disability
   shall be communicated to the Executive by written notice, and shall be
   effective on the 30th day after receipt of such notice by the Executive
   (the "Disability Effective Date"), unless the Executive returns to full-
   time performance of the Executive's duties before the Disability Effective
   Date.

               (b)   By the Company.  

                     (i)  The Company may terminate the Executive's
   employment during the Employment Period for Cause or without Cause. 
   "Cause" means:

                     A.         the willful and continued failure of the
   Executive substantially to perform the Executive's duties under this
   Agreement (other than as a result of physical or mental illness or
   injury), after the Board of the Company delivers to the Executive a

                                        3
<PAGE>

   written demand for substantial performance that specifically identifies
   the manner in which the Board believes that the Executive has not
   substantially performed the Executive's duties; or

                     B.         illegal conduct or gross misconduct by the
   Executive, in either case that is willful and results in material and
   demonstrable damage to the business or reputation of the Company.

         No act or failure to act on the part of the Executive shall be
   considered "willful" unless it is done, or omitted to be done, by the
   Executive in bad faith or without reasonable belief that the Executive's
   action or omission was in the best interests of the Company.  Any act or
   failure to act that is based upon authority given pursuant to a resolution
   duly adopted by the Board, or the advice of counsel for the Company, shall
   be conclusively presumed to be done, or omitted to be done, by the
   Executive in good faith and in the best interests of the Company.

                     (ii)  A termination of the Executive's employment for
   Cause shall be effected in accordance with the following procedures.  The
   Company shall give the Executive written notice ("Notice of Termination
   for Cause") of its intention to terminate the Executive's employment for
   Cause, setting forth in reasonable detail the specific conduct of the
   Executive that it considers to constitute Cause and the specific
   provision(s) of this Agreement on which it relies, and stating the date,
   time and place of the Special Board Meeting for Cause.  The "Special Board
   Meeting for Cause" means a meeting of the Board called and held
   specifically for the purpose of considering the Executive's termination
   for Cause, that takes place not less than ten and not more than twenty
   business days after the Executive receives the Notice of Termination for
   Cause.  The Executive shall be given an opportunity, together with
   counsel, to be heard at the Special Board Meeting for Cause.  The
   Executive's termination for Cause shall be effective when and if a
   resolution is duly adopted at the Special Board Meeting for Cause by
   affirmative vote of at least the greater of (A) two-thirds (2/3) of the
   entire membership of the Board (excluding the Executive who shall not vote
   on this matter) or (B) ten (10) members of the Board, stating that in the
   good faith opinion of the Board, the Executive is guilty of the conduct
   described in the Notice of Termination for Cause, and that conduct
   constitutes Cause under this Agreement.

                     (iii)      A termination of the Executive's employment
   without Cause shall be effective in accordance with the following
   procedures.  The Company shall give the Executive written notice ("Notice
   of Termination without Cause") of its intention to terminate the
   Executive's employment without Cause, stating the date, time and place of
   the Special Board Meeting without Cause.  The "Special Board Meeting
   without Cause" means a meeting of the Board called and held specifically
   for the purpose of considering the Executive's termination without Cause,
   that takes place not less than ten and not more than twenty business days
   after the Executive receives the Notice of Termination without Cause.  The
   Executive shall be given an opportunity, together with counsel, to be
   heard at the Special Board Meeting without Cause.  The Executive's
   termination without Cause shall be effective when and if a resolution is
   duly adopted at the Special Board Meeting without Cause by affirmative
   vote of at least the greater of (A) two-thirds (2/3) of the entire
   membership of the Board (excluding the Executive who shall not vote on
   this matter) or (B) ten (10) members of the Board, stating that the
   Executive is terminated without Cause.

               (c)   Good Reason. 


                                        4
<PAGE>

                     (i)        The Executive may terminate employment for
   Good Reason or without Good Reason.  "Good Reason" means:

                     A.         the assignment to the Executive of any duties
   inconsistent in any respect with paragraph (a) of Section 2 of his
   Agreement, or any other action by the Company that results in a diminution
   in the Executive's position, authority, duties or responsibilities, other
   than an isolated, insubstantial and inadvertent action that is not taken
   in bad faith and is remedied by the Company promptly after receipt of
   notice thereof from the Executive;

                     B.         any failure by the Company to comply with any
   provision of Section 3 of this Agreement, other than an isolated,
   insubstantial and inadvertent failure that is not taken in bad faith and
   is remedied by the Company promptly after receipt of notice thereof from
   the Executive;

                     C.         the assignment or reassignment by the Company
   of the Executive without the Executive's consent to another place of
   employment more than 50 miles from the Company's headquarters indicated in
   Section 2(d);

                     D.         any purported termination of the Executive's
   employment by the Company for a reason or in a manner not expressly
   permitted by this Agreement;

                     E.         any failure by the Company to comply with
   paragraph (c) of Section 11 of this Agreement; or

                     F.         any other substantial breach of this Agreement
   by the Company that either is not taken in good faith or is not remedied
   by the Company promptly after receipt of notice thereof from the
   Executive.

   The Company and the Executive, upon mutual written agreement, may waive
   any of the foregoing provisions which would otherwise constitute Good
   Reason.

                     (ii)        A termination of employment by the Executive
   for Good Reason shall be effectuated by giving the Company written notice
   ("Notice of Termination for Good Reason") of the termination, setting
   forth in reasonable detail the specific conduct of the Company that
   constitutes Good Reason and the specific provision(s) of this Agreement on
   which the Executive relies.  A termination of employment by the Executive
   for Good Reason shall be effective on the fifth business day following the
   date when the Notice of Termination for Good Reason is given, unless the
   notice sets forth a later date (which date shall in no event be later than
   30 days after the notice is given).  For purposes of this Section 4(c),
   any good faith determination of "Good Reason" made by the Executive shall
   be conclusive.

                     (iii)  A termination of the Executive's employment by
   the Executive without Good Reason shall be effected by giving the Company
   written notice of the termination.

               (d)   No Waiver.  The failure to set forth any fact or
   circumstance in a Notice of Termination for Cause, a Notice of Termination
   without Cause or a Notice of Termination for Good Reason shall not
   constitute a waiver of the right to assert, and shall not preclude the
   party giving notice from asserting, such fact or circumstance in an
   attempt to enforce any right under or provision of this Agreement.

                                        5
<PAGE>

               (e)   Date of Termination.  The "Date of Termination" means
   the date of the Executive's death, the Disability Effective Date, the date
   on which the termination of the Executive's employment by the Company for
   Cause or without Cause or by the Executive for Good Reason is effective,
   or the date on which the Executive gives the Company notice of a
   termination of employment without Good Reason, as the case may be.

         5.    Obligations of the Company upon Termination.  

               (a)   By the Company other than for cause or disability; by
   the Executive for Good Reason.  If, during the Employment Period, the
   Company terminates the Executive's employment, other than for Cause or
   Disability, or the Executive terminates employment for Good Reason, the
   Company shall continue to provide the Executive with the compensation and
   benefits set forth in paragraphs (a), (b) and (c) of Section 3 as if he
   had remained employed by the Company pursuant to this Agreement through
   the end of the Employment Period and then retired (at which time he will
   be treated as eligible for all retiree welfare benefits and other benefits
   provided to retired senior executives, as set forth in Section 3(c)(ii)
   and (iii)); PROVIDED, that the Incentive Compensation for such period
   shall be based upon the target Incentive Compensation for the year in
   which the Date of Termination occurs; PROVIDED, further, that in lieu of
   stock options, restricted stock and other stock-based awards, the
   Executive shall be paid cash equal to the fair market value as of the Date
   of Termination (without regard to any restrictions and based upon a
   valuation model generally utilized for purposes of valuing comparable
   stock based compensation awards) of the stock options, restricted stock
   and other stock-based awards that would otherwise have been granted with
   such cash being paid within 90 days after the Date of Termination;
   PROVIDED, further, that to the extent any benefits described in paragraph
   (c) of Section 3 cannot be provided pursuant to the plan or program
   maintained by the Company for its executives, the Company shall provide
   such benefits outside such plan or program at no additional cost
   (including without limitation tax cost) to the Executive and his family;
   and PROVIDED, finally, that during any period when the Executive is
   eligible to receive benefits of the type described in clause (B) of
   paragraph (c)(iii) of Section 3 under another employer-provided plan, the
   benefits provided by the Company under paragraph (a) of Section 5 may be
   made secondary to those provided under another plan.  In addition to the
   foregoing, any restricted stock outstanding on the Date of Termination
   shall be fully vested as of the Date of Termination and all options
   outstanding on the Date of Termination shall be fully vested and
   exercisable and shall remain in effect and exercisable through the  end of
   their respective terms, without regard to the termination of the
   Executive's employment.  The payments and benefits provided pursuant to
   this paragraph (a) of Section 5 are intended as liquidated damages for a
   termination of the Executive's employment by the Company other than for
   Cause or Disability or for the actions of the Company leading to a
   termination of the Executive's employment by the Executive for Good
   Reason, and shall be the sole and exclusive remedy therefor.

               (b)   Death or Disability.  If the Executive's employment is
   terminated by reason of the Executive's death or Disability during the
   Employment Period, the Company shall pay to the Executive or, in the case
   of the Executive's death, to the Executive's designated beneficiaries (or,
   if there is no such beneficiary, to the Executive's estate or legal
   representative) in a lump sum in cash within 30 days after the Date of
   Termination, the sum of the following amounts (the "Accrued Obligations"): 
   (1) any portion of the Executive's Annual Base Salary through the Date of
   Termination that has not yet been paid; (2) an amount representing the
   target Incentive Compensation for the year that includes the Date of

                                        6
<PAGE>

   Termination, computed by assuming that the amount of all such target
   Incentive Compensation would be equal to the amount of such target
   Incentive Compensation that the Executive would have been eligible to earn
   for such period, and multiplying that amount by a fraction, the numerator
   of which is the number of days in such period through the Date of
   Termination, and the denominator of which is the total number of days in
   the relevant period (3) any compensation previously deferred by the
   Executive (together with any accrued interest or earnings thereon) that
   has not yet been paid; and (4) any accrued but unpaid Incentive
   Compensation and vacation pay; and the Company shall have no further
   obligations under this Agreement, except as specified in Section 6 below. 
   If the Executive's employment is terminated by reason of Disability, he
   shall be entitled to receive the maximum disability payments which can be
   provided under the disability plans described in Section 3(c)(ii),
   reduced, however, by actual disability benefits received under such plans.

               (c) By the Company for Cause; by the Executive other than for
   Good Reason.  If the Executive's employment is terminated by the Company
   for Cause during the Employment Period, the Company shall pay the
   Executive the Annual Base Salary through the Date of Termination and the
   amount of any compensation previously deferred by the Executive (together
   with any accrued interest or earnings thereon), in each case to the extent
   not yet paid, and the Company shall have no further obligations under this
   Agreement, except as specified in Section 6 below. If the Executive
   voluntarily terminates employment during the Employment Period, other than
   for Good Reason, the Company shall pay the Accrued Obligations to the
   Executive in a lump sum in cash within 30 days of the Date of Termination,
   and the Company shall have no further obligations under this Agreement,
   except as specified in Section 6 below. 

         6.    Non-Exclusivity of Rights. Nothing in this Agreement shall
   prevent or limit the Executive's continuing or future participation in any
   plan, program, policy or practice provided by the Company or any of its
   affiliated companies for which the Executive may qualify, nor, subject to
   paragraph (f) of Section 12, shall anything in this Agreement limit or
   otherwise affect such rights as the Executive may have under any contract
   or agreement with the Company or any of its affiliated companies. Vested
   benefits and other amounts that the Executive is otherwise entitled to
   receive under the SERP or any other plan, policy, practice or program of,
   or any contract or agreement with, the Company or any of its affiliated
   companies on or after the Date of Termination shall be payable in
   accordance with the terms of each such plan, policy, practice, program,
   contract or agreement, as the case may be, except as explicitly modified
   by this Agreement. 

         7.    Full Settlement.  The Company's obligation to make the
   payments provided for in, and otherwise to perform its obligations under,
   this Agreement shall not be affected by any set-off, counterclaim,
   recoupment, defense or other claim, right or action that the Company may
   have against the Executive or others. In no event shall the Executive be
   obligated to seek other employment or take any other action by way of
   mitigation of the amounts payable to the Executive under any of the
   provisions of this Agreement and, except as specifically provided in
   paragraph (a) of Section 5 with respect to benefits described in clause
   (B) of paragraph (c)(iii) of Section 3, such amounts shall not be reduced,
   regardless of whether the Executive obtains other employment. 

         8.    Non-Competition Provision and Confidential Information.  
               (a)  Without prior written consent of the Company, for the
   greater of (i) the twenty-four (24) month period following the Date of
   Termination, or (ii) the remaining term of this Agreement, the Executive

                                        7
<PAGE>

   shall not, as a shareholder, officer, director, partner, consultant, or
   otherwise, engage directly or indirectly in any business or enterprise
   which is "in competition" with the Company or its successors or assigns;
   provided, however, that the Executive's ownership of less than five
   percent of the issued and outstanding voting securities of a publicly-
   traded company shall not be deemed to constitute such competition.  A
   business or enterprise is deemed to be "in competition" if it is engaged
   in the business of generation, purchase, transmission, distribution, or
   sale of  electricity, or in the purchase, transmission, distribution, sale
   or transportation of natural gas within the States of Colorado, New
   Mexico, Texas, Wyoming, Kansas or Oklahoma.  

               (b)  The Executive shall hold in a fiduciary capacity for the
   benefit of the Company all secret or confidential information, knowledge
   or data relating to the Company or any of its affiliated companies and
   their respective businesses that the Executive obtains during the
   Executive's employment by the Company or any of its affiliated companies
   and that is not public knowledge (other than as a result of the
   Executive's violation of this Section 8) ("Confidential Information"). The
   Executive shall not communicate, divulge or disseminate Confidential
   Information at any time during or after the Executive's employment with
   the Company, except with the prior written consent of the Company or as
   otherwise required by law or legal process. In no event shall any asserted
   violation of the provisions of this Section 8 constitute a basis for
   deferring or withholding any amounts otherwise payable to the Executive
   under this Agreement. 

         9.    Certain Additional Payments by the Company.

               (a) Anything in this Agreement to the contrary
   notwithstanding, in the event it shall be determined that any payment or
   distribution by the Company to or for the benefit of the Executive
   (whether paid or payable or distributed or distributable pursuant to the
   terms of this Agreement or otherwise, but determined without regard to any
   additional payments required under this Section 9) (a "Payment") would be
   subject to the excise tax imposed by Section 4999 of the Internal Revenue
   Code of 1986, as amended (the "Code") or any interest or penalties are
   incurred by the Executive with respect to such excise tax (such excise
   tax, together with any such interest and penalties, are hereinafter
   collectively referred to as the "Excise Tax"), then the Executive shall be
   entitled to receive an additional payment (a "Gross-Up Payment") in an
   amount such that after payment by the Executive of all taxes (including
   any interest or penalties imposed with respect to such taxes), including,
   without limitation, any income taxes (and any interest and penalties
   imposed with respect thereto) and Excise Tax imposed upon the Gross-Up
   Payment, the Executive retains an amount of the Gross-Up Payment equal to
   the Excise Tax imposed upon the Payments. 

               (b)   Subject to the provisions of paragraph (c) of this
   Section 9, all determinations required to be made under this Section 9,
   including whether and when a Gross-Up Payment is required and the amount
   of such Gross-up Payment and the assumptions to be utilized in arriving at
   such determination, shall be made by a nationally recognized certified
   public accounting firm designated by the Executive (the "Accounting
   Firm"), which shall provide detailed supporting calculations both to the
   Company and the Executive within 15 business days of the receipt of notice
   from the Executive that there has been a Payment, or such earlier time as
   is requested by the Company.  All fees and expenses of the Accounting Firm
   shall be borne solely by the Company. Any Gross-Up Payment, as determined
   pursuant to this Section 9, shall be paid by the Company to the Executive
   within five days of the receipt of the Accounting Firm's determination.

                                        8
<PAGE>

   Any determination by the Accounting Firm shall be binding upon the Company
   and the Executive. As a result of the uncertainty in the application of
   Section 4999 of the Code at the time of the initial determination by the
   Accounting Firm hereunder, it is possible that Gross-Up Payments which
   will not have been made by the Company should have been made
   ("Underpayment") consistent with the calculations required to be made
   hereunder. In the event that the Company exhausts its remedies pursuant to
   paragraph (c) of this Section 9 and the Executive thereafter is required
   to make a payment of any Excise Tax, the Accounting Firm shall determine
   the amount of the Underpayment that has occurred and any such Underpayment
   shall be promptly paid by the Company to or for the benefit of the
   Executive. 

               (c)   The Executive shall notify the Company in writing of any
   claim by the Internal Revenue Service that, if successful, would require
   the payment by the Company of the Gross-Up Payment. Such notification
   shall be given as soon as practicable but no later than ten business days
   after the Executive is informed in writing of such claim and shall apprise
   the Company of the nature of such claim and the date on which such claim
   is requested to be paid. The Executive shall not pay such claim prior to
   the expiration of the 30-day period following the date on which it gives
   such notice to the Company (or such shorter period ending on the date that
   any payment of taxes with respect to such claim is due). If the Company
   notifies the Executive in writing prior to the expiration of such period
   that it desires to contest such claim, the Executive shall: 

                     (i)        give the Company any information reasonably
   requested by the Company relating to such claim, 

                     (ii)       take such action in connection with contesting
   such claim as the Company shall reasonably request in writing from time to
   time, including, without limitation, accepting legal representation with
   respect to such claim by an attorney reasonably selected by the Company, 

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

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

         PROVIDED, however, that the Company shall bear and pay directly all
   costs and expenses (including additional interest and penalties) incurred
   in connection with such contest and shall indemnify and hold the Executive
   harmless, on an after-tax basis, for any Excise Tax or income tax
   (including interest and penalties with respect thereto) imposed as a
   result of such representation and payment of costs and expenses. Without
   limitation on the foregoing provisions of this paragraph (c) of Section 9,
   the Company shall control all proceedings taken in connection with such
   contest and, at its sole option, may pursue or forego any and all
   administrative appeals, proceedings, hearings and conferences with the
   taxing authority in respect of such claim and may, at its sole option,
   either direct the Executive to pay the tax claimed and sue for a refund or
   contest the claim in any permissible manner, and the Executive agrees to
   prosecute such contest to a determination before any administrative
   tribunal, in a court of initial jurisdiction and in one or more appellate
   courts, as the Company shall determine; PROVIDED, however, that if the
   Company directs the Executive to pay such claim and sue for a refund, the
   Company shall advance the amount of such payment to the Executive, on an
   interest-free basis and shall indemnify and hold the Executive harmless,
   on an after-tax basis, from any Excise Tax or income tax (including
   interest or penalties with respect thereto) imposed with respect to such

                                        9
<PAGE>

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

               (d)   If, after the receipt by the Executive of an amount
   advanced by the Company pursuant to paragraph (c) of this Section 9, the
   Executive becomes entitled to receive any refund with respect to such
   claim, the Executive shall (subject to the Company's complying with the
   requirements of paragraph (c) of this Section 9) promptly pay to the
   Company the amount of such refund (together with any interest paid or
   credited thereon after taxes applicable thereto). If after the receipt by
   the Executive of an amount advanced by the Company pursuant to paragraph
   (c) of this Section 9, a determination is made that the Executive shall
   not be entitled to any refund with respect to such claim and the Company
   does not notify the Executive in writing of its intent to contest such
   denial of refund prior to the expiration of 30 days after such
   determination, then such advance shall be forgiven and shall not be
   required to be repaid and the amount of such advance shall offset, to the
   extent thereof, the amount of Gross-Up Payment required to be paid. 

         10.   Attorneys' Fees.  The Company agrees to pay, as incurred, to
   the fullest extent permitted by law, all legal fees and expenses that the
   Executive may reasonably incur as a result of any contest (regardless of
   the outcome) by the Company, the Executive or others of the validity or
   enforceability of or liability under, or otherwise involving, any
   provision of this Agreement, together with interest on any delayed payment
   at the applicable federal rate provided for in Section 7872(f)(2)(A) of
   the Code. 

         11.   Successors.

               (a)   This Agreement is personal to the Executive and, without
   the prior written consent of the Company, shall not be assignable by the
   Executive otherwise than by will or the laws of descent and distribution.
   This Agreement shall inure to the benefit of and be enforceable by the
   Executive's legal representatives. 

               (b)   This Agreement shall inure to the benefit of and be
   binding upon the Company and its successors and assigns. 

               (c)   The Company shall require any successor (whether direct
   or indirect, by purchase, merger, consolidation or otherwise) to all or
   substantially all of the business and/or assets of the Company expressly
   to assume and agree to perform this Agreement in the same manner and to
   the same extent that the Company would have been required to perform it if
   no such succession had taken place. As used in this Agreement, "Company"
   shall mean both the Company as defined above and any such successor that
   assumes and agrees to perform this Agreement, by operation of law or
   otherwise. 

         12.   Miscellaneous.

               (a)   This Agreement shall be governed by, and construed in
   accordance with, the laws of the State of Colorado, without reference to
   principles of conflict of laws. The captions of this Agreement are not

                                        10
<PAGE>

   part of the provisions hereof and shall have no force or effect. This
   Agreement may not be amended or modified except by a written agreement
   executed by the parties hereto or their respective successors and legal
   representatives. 

               (b) All notices and other communications under this Agreement
   shall be in writing and shall be given by hand delivery to the other party
   or by registered or certified mail, return receipt requested, postage
   prepaid, addressed as follows: 

   If to the Executive: 
                                Mr. Bill D. Helton
                                7801 Tarrytown Avenue
                                Amarillo, TX  79121

   If to the Company: 
                                M-P New Co.
                                1225 17th Street
                                Denver, CO  80202
                                Attention: General Counsel 

   or to such other address as either party furnishes to the other in writing
   in accordance with this paragraph (b) of Section 12. Notices and
   communications shall be effective when actually received by the addressee.


               (c)   The invalidity or unenforceability of any provision of
   this Agreement shall not affect the validity or enforceability of any
   other provision of this Agreement. If any provision of this Agreement
   shall be held invalid or unenforceable in part, the remaining portion of
   such provision, together with all other provisions of this Agreement,
   shall remain valid and enforceable and continue in full force and effect
   to the fullest extent consistent with law. 

               (d)   Notwithstanding any other provision of this Agreement,
   the Company may withhold from amounts payable under this Agreement all
   federal, state, local and foreign taxes that are required to be withheld
   by applicable laws or regulations. 

               (e)   The Executive's or the Company's failure to insist upon
   strict compliance with any provision of, or to assert any right under,
   this Agreement (including, without limitation, the right of the Executive
   to terminate employment for Good Reason pursuant to paragraph (c) of
   Section 4 of this Agreement) shall not be deemed to be a waiver of such
   provision or right or of any other provision of or right under this
   Agreement. 

               (f)   The Executive and the Company acknowledge that this
   Agreement supersedes and terminates any other severance and employment
   agreements between the Executive and the Company, SPS or the Company's
   affiliates. 

               (g)   The rights and benefits of the Executive under this
   Agreement may not be anticipated, assigned, alienated or subject to
   attachment, garnishment, levy, execution or other legal or equitable
   process except as required by law. Any attempt by the Executive to
   anticipate, alienate assign, sell, transfer, pledge, encumber or charge
   the same shall be void. Payments hereunder shall not be considered assets
   of the Executive in the event of insolvency or bankruptcy. 



                                        11
<PAGE>

               (h)   This Agreement may be executed in several counterparts,
   each of which shall be deemed an original, and said counterparts shall
   constitute but one and the same instrument. 

         IN WITNESS WHEREOF, the Executive has hereunto set the Executive's
   hand and, pursuant to the authorization of its Board of Directors, the
   Company has caused this Agreement to be executed in its name on its
   behalf, all as of the day and year first above written. 

                                       _______________________________ 
                                       Bill D. Helton


                                       COMPANY


                                       By:______________________________




                                        12
<PAGE>

                                                                    EXHIBIT E 









                               EMPLOYMENT AGREEMENT

                                WAYNE H. BRUNETTI
<PAGE>

                                TABLE OF CONTENTS

                                                                          PAGE

   Employment Period . . . . . . . . . . . . . . . . . . . . . . . . . .     1

   Position and Duties . . . . . . . . . . . . . . . . . . . . . . . . .     1

   Compensation  . . . . . . . . . . . . . . . . . . . . . . . . . . . .     2

   Termination of Employment . . . . . . . . . . . . . . . . . . . . . .     4

   Obligations of the Company upon Termination . . . . . . . . . . . . .     7

   Non-Exclusivity of Rights . . . . . . . . . . . . . . . . . . . . . .     9

   Full Settlement . . . . . . . . . . . . . . . . . . . . . . . . . . .     9

   Non-Competition Provision and Confidential Information  . . . . . . .     9

   Certain Additional Payments by the Company  . . . . . . . . . . . . .    10

   Attorneys' Fees . . . . . . . . . . . . . . . . . . . . . . . . . . .    12

   Successors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    13

   Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . .    13
<PAGE>


                               EMPLOYMENT AGREEMENT


         THIS AGREEMENT by and between M-P New Co., a Delaware corporation
   (the "Company"), and Wayne H. Brunetti (the "Executive"), dated as of the
   __ day of __________, 199__.


                                 WITNESSETH THAT

         WHEREAS, Public Service Company of Colorado, a Colorado corporation
   ("PSC") and Southwestern Public Service Company, a New Mexico corporation
   ("SPS") have entered into an Agreement and Plan of Reorganization dated as
   of August 22, 1995 (the "Reorganization Agreement"), whereby wholly owned
   subsidiaries of Company will merge into PSC and SPS; and

         WHEREAS, PSC and SPS wish to provide for the orderly succession of
   management of the Company following the Effective Time (as defined in the
   Reorganization Agreement); and

         WHEREAS, PSC and SPS further wish to provide for the employment by
   the Company of the Executive, and the Executive wishes to serve the
   Company, in the capacities and on the terms and conditions set forth in
   this Agreement;

         NOW, THEREFORE, it is hereby agreed as follows:

         1.    Employment Period.  The Company shall employ the Executive,
   and the Executive shall serve the Company, on the terms and conditions set
   forth in this Agreement, for an initial period (the "Initial Period") and
   a further period (the "Secondary Period") (the Initial Period and the
   Secondary Period are hereinafter referred to in the aggregate as the
   "Employment Period").  The Initial Period shall begin at the Effective
   Time (as defined in the Reorganization Agreement the "Effective Time") and
   end on the later of (i) June 30, 1999, or (ii) two and one-half (2 1/2)
   years from the Effective Time.  The Secondary Period shall begin on the
   first day after the end of the Initial Period and end on May 31, 2001.

         2.    Position and Duties.  

               (a)  During the Initial Period, the Executive shall serve as
   President and Chief Operating Officer of the Company, and as Vice-Chairman
   of the Board of the Company (the "Board").  During the Secondary Period,
   the Executive shall serve as President of the Company, Chief Executive
   Officer of the Company and Vice-Chairman of the Board.  The Executive
   shall serve in each case as an employee of the Company and with such
   duties and responsibilities as are customarily assigned to such positions,
   and such other duties and responsibilities not inconsistent therewith as
   may from time to time be assigned to him by the Board.  The Executive
   shall be a member of the Board on the first day of the Employment Period,
   and the Board shall propose the Executive for re-election to the Board
   throughout the Employment Period.  

               (b)   During the Initial Period as is customary, the Executive
   shall report to the Chief Executive Officer and during the Secondary
   Period, as is customary the Executive shall report to the Board.

               (c)   During the Employment Period, and excluding any periods
   of vacation and sick leave to which the Executive is entitled, the
   Executive shall devote reasonable attention and time during normal

                                        1
<PAGE>

   business hours to the business and affairs of the Company and, to the
   extent necessary to discharge the responsibilities assigned to the
   Executive under this Agreement, use the Executive's reasonable best
   efforts to carry out such responsibilities faithfully and efficiently.  It
   shall not be considered a violation of the foregoing for the Executive to
   serve on corporate, industry, civic or charitable boards or committees, so
   long as such activities do not significantly interfere with the
   performance of the Executive's responsibilities as an employee of the
   Company in accordance with this Agreement.

               (d)   The Executive's services shall be performed primarily at
   the Company's headquarters in Denver, Colorado.

         3.    Compensation.  

               (a)  Base Salary.  The Executive's compensation during the
   Employment Period shall be determined by the Board upon the recommendation
   of the Compensation Committee of the Board, subject to the next sentence
   and Section 3(b).  During the Employment Period, the Executive shall
   receive an annual base salary ("Annual Base Salary") of not less than his
   annual base salary from PSC as in effect immediately before the Effective
   Time.  During the Initial Period, Executive shall be compensated by the
   Company and its subsidiaries at a level that is higher than the
   compensation from the Company and its subsidiaries received by any other
   executive officer of the Company except the Chief Executive Officer and
   Chairman of the Board.  The Annual Base Salary shall be payable in
   accordance with the Company's regular payroll practice for its senior
   executives, as in effect from time to time.  During the Employment Period,
   the Annual Base Salary shall be reviewed at least annually.  Any increase
   in the Annual Base Salary shall not limit or reduce any other obligation
   of the Company under this Agreement.  

               (b)   Incentive Compensation.  During the Employment Period,
   the Executive shall participate in short-term incentive compensation plans
   and long-term incentive compensation plans (the latter to consist of plans
   offering stock options, restricted stock and other long-term incentive
   compensation) providing him with the opportunity to earn, on a year-by-
   year basis, short-term and long-term incentive compensation (the
   "Incentive Compensation") at least equal to the greater of (i) the amounts
   that he had the opportunity to earn under the comparable plans of PSC as
   in effect immediately before the Effective Time, or (ii) the amounts that
   the next highest executive officer of the Company has the opportunity to
   earn under plans of the Company and its subsidiaries for that year.

               (c)   Other Benefits.  

                     (i)  Supplemental Executive Retirement Plan.  During the
   Employment Period, the Executive shall participate in a supplemental
   executive retirement plan ("SERP") such that the aggregate value of the
   retirement benefits that he and his spouse will receive at the end of the
   Employment Period under all defined benefit plans of the Company and its
   affiliates (whether qualified or not) will be not less than the aggregate
   value of the benefits he and his spouse would have received (and with the
   same forms of benefit payments) had he continued, through the end of the
   Employment Period, to accrue the supplemental retirement benefits provided
   by the terms of his employment agreement with PSC as in effect immediately
   before the Effective Time.  The Company shall maintain and fund one or
   more grantor trusts (the "Trusts"), or such other funding mechanism as may
   be satisfactory to the Executive, which shall comply with the following
   sentence and which shall at all times be adequate to provide for the
   payment of all benefits under the SERP to the Executive, as well as any

                                        2
<PAGE>

   elective deferrals by the Executive under any non-qualified plan (with
   such adequacy being determined by an independent consulting firm
   acceptable to the Executive, whose fees shall be paid by the Company). 
   The assets of the Trusts (if any) shall be subject to the claims of the
   Company's creditors, and the Trusts (if any) shall in all other respects
   be designed to prevent the Executive and his spouse from being taxed on
   the assets or income thereof, except as and when such assets or income are
   paid to them.

                     (ii)       During the Employment Period, the Company
   shall provide the Executive with life insurance coverage providing a death
   benefit to such beneficiary or beneficiaries as the Executive may
   designate of not less than two times his Annual Base Salary.  

                     (iii)      In addition, and without limiting the
   generality of the foregoing, during the Employment Period and thereafter: 
   (A) the Executive shall be entitled to participate in all applicable
   incentive, savings and retirement plans, practices, policies and programs
   of the Company and its subsidiaries to the same extent as other senior
   executives of the Company; and (B) the Executive and/or the Executive's
   family, as the case may be, shall be eligible for participation in, and
   shall receive all benefits under, all applicable welfare benefit plans,
   practices, policies and programs provided by the Company and its
   subsidiaries, other than severance plans, practices, policies and programs
   but including, without limitation, medical, prescription, dental,
   disability, sick leave, employee life insurance, group life insurance,
   accidental death and travel accident insurance plans and programs, to the
   same extent as other senior executives of the Company.

               (d)   Fringe Benefits.  During the Employment Period, the
   Executive shall be entitled to receive fringe benefits on the same terms
   and conditions as the greater of (i) the fringe benefits received by, or
   available to, him from PSC immediately before the Effective Time, or (ii)
   the fringe benefits provided by the Company or its subsidiaries which are
   available to the next highest executive officer of the Company for the
   year.

         4.    Termination of Employment. 

               (a)   Death or Disability.  The Executive's employment shall
   terminate automatically upon the Executive's death during the Employment
   Period.  The Company shall be entitled to terminate the Executive's
   employment because of the Executive's Disability during the Employment
   Period.  "Disability" means that (i) the Executive has been unable, for a
   period of 180 consecutive business days, to perform the Executive's duties
   under this Agreement, as a result of physical or mental illness or injury,
   and (i) a physician selected by the Company or its insurers, and
   acceptable to the Executive or the Executive's legal representative, has
   determined that the Executive's incapacity is total and permanent.  A
   termination of the Executive's employment by the Company for Disability
   shall be communicated to the Executive by written notice, and shall be
   effective on the 30th day after receipt of such notice by the Executive
   (the "Disability Effective Date"), unless the Executive returns to full-
   time performance of the Executive's duties before the Disability Effective
   Date.

               (b)   By the Company.  

                     (i)  The Company may terminate the Executive's
   employment during the Employment Period for Cause or without Cause. 
   "Cause" means:

                                        3
<PAGE>

                     A.         the willful and continued failure of the
   Executive substantially to perform the Executive's duties under this
   Agreement (other than as a result of physical or mental illness or
   injury), after the Board of the Company delivers to the Executive a
   written demand for substantial performance that specifically identifies
   the manner in which the Board believes that the Executive has not
   substantially performed the Executive's duties; or

                     B.         illegal conduct or gross misconduct by the
   Executive, in either case that is willful and results in material and
   demonstrable damage to the business or reputation of the Company.

         No act or failure to act on the part of the Executive shall be
   considered "willful" unless it is done, or omitted to be done, by the
   Executive in bad faith or without reasonable belief that the Executive's
   action or omission was in the best interests of the Company.  Any act or
   failure to act that is based upon authority given pursuant to a resolution
   duly adopted by the Board, or the advice of counsel for the Company, shall
   be conclusively presumed to be done, or omitted to be done, by the
   Executive in good faith and in the best interests of the Company.

                     (ii)  A termination of the Executive's employment for
   Cause shall be effected in accordance with the following procedures.  The
   Company shall give the Executive written notice ("Notice of Termination
   for Cause") of its intention to terminate the Executive's employment for
   Cause, setting forth in reasonable detail the specific conduct of the
   Executive that it considers to constitute Cause and the specific
   provision(s) of this Agreement on which it relies, and stating the date,
   time and place of the Special Board Meeting for Cause.  The "Special Board
   Meeting for Cause" means a meeting of the Board called and held
   specifically for the purpose of considering the Executive's termination
   for Cause, that takes place not less than ten and not more than twenty
   business days after the Executive receives the Notice of Termination for
   Cause.  The Executive shall be given an opportunity, together with
   counsel, to be heard at the Special Board Meeting for Cause.  The
   Executive's termination for Cause shall be effective when and if a
   resolution is duly adopted at the Special Board Meeting for Cause by
   affirmative vote of at least the greater of (A) two-thirds (2/3) of the
   entire membership of the Board (excluding the Executive who shall not vote
   on this matter) or (B) ten (10) members of the Board, stating that in the
   good faith opinion of the Board, the Executive is guilty of the conduct
   described in the Notice of Termination for Cause, and that conduct
   constitutes Cause under this Agreement.

                     (iii)      A termination of the Executive's employment
   without Cause shall be effective in accordance with the following
   procedures.  The Company shall give the Executive written notice ("Notice
   of Termination without Cause") of its intention to terminate the
   Executive's employment without Cause, stating the date, time and place of
   the Special Board Meeting without Cause.  The "Special Board Meeting
   without Cause" means a meeting of the Board called and held specifically
   for the purpose of considering the Executive's termination without Cause,
   that takes place not less than ten and not more than twenty business days
   after the Executive receives the Notice of Termination without Cause.  The
   Executive shall be given an opportunity, together with counsel, to be
   heard at the Special Board Meeting without Cause.  The Executive's
   termination without Cause shall be effective when and if a resolution is
   duly adopted at the Special Board Meeting without Cause by affirmative
   vote of the greater of (A) at least two-thirds (2/3) of the entire
   membership of the Board (excluding the Executive who shall not vote on


                                        4
<PAGE>

   this matter) or (B) ten members of the Board stating that the Executive is
   terminated without Cause.


         (c)   Good Reason. 

                     (i)        The Executive may terminate employment for
   Good Reason or without Good Reason.  "Good Reason" means:

                     A.         the assignment to the Executive of any duties
   inconsistent in any respect with paragraph (a) of Section 2 of his
   Agreement, or any other action by the Company that results in a diminution
   in the Executive's position, authority, duties or responsibilities, other
   than an isolated, insubstantial and inadvertent action that is not taken
   in bad faith and is remedied by the Company promptly after receipt of
   notice thereof from the Executive;

                     B.         any failure by the Company to comply with any
   provision of Section 3 of this Agreement, other than an isolated,
   insubstantial and inadvertent failure that is not taken in bad faith and
   is remedied by the Company promptly after receipt of notice thereof from
   the Executive;

                     C.         the assignment or reassignment by the Company
   of the Executive without the Executive's consent to another place of
   employment more than 50 miles from the Company's headquarters indicated in
   Section 2(d);

                     D.         any purported termination of the Executive's
   employment by the Company for a reason or in a manner not expressly
   permitted by this Agreement;

                     E.         any failure by the Company to comply with
   paragraph (c) of Section 11 of this Agreement; or

                     F.         any other substantial breach of this Agreement
   by the Company that either is not taken in good faith or is not remedied
   by the Company promptly after receipt of notice thereof from the
   Executive.

   The Company and the Executive, upon mutual written agreement, may waive
   any of the foregoing provisions which would otherwise constitute Good
   Reason.

                     (ii)        A termination of employment by the Executive
   for Good Reason shall be effectuated by giving the Company written notice
   ("Notice of Termination for Good Reason") of the termination, setting
   forth in reasonable detail the specific conduct of the Company that
   constitutes Good Reason and the specific provision(s) of this Agreement on
   which the Executive relies.  A termination of employment by the Executive
   for Good Reason shall be effective on the fifth business day following the
   date when the Notice of Termination for Good Reason is given, unless the
   notice sets forth a later date (which date shall in no event be later than
   30 days after the notice is given).  For purposes of this Section 4(c),
   any good faith determination of "Good Reason" made by the Executive shall
   be conclusive.

                     (iii)  A termination of the Executive's employment by
   the Executive without Good Reason shall be effected by giving the Company
   written notice of the termination.


                                        5
<PAGE>

               (d)   No Waiver.  The failure to set forth any fact or
   circumstance in a Notice of Termination for Cause, a Notice of Termination
   without Cause or a Notice of Termination for Good Reason shall not
   constitute a waiver of the right to assert, and shall not preclude the
   party giving notice from asserting, such fact or circumstance in an
   attempt to enforce any right under or provision of this Agreement.

               (e)   Date of Termination.  The "Date of Termination" means
   the date of the Executive's death, the Disability Effective Date, the date
   on which the termination of the Executive's employment by the Company for
   Cause or without Cause or by the Executive for Good Reason is effective,
   or the date on which the Executive gives the Company notice of a
   termination of employment without Good Reason, as the case may be.

         5.    Obligations of the Company upon Termination.  

               (a)   By the Company other than for cause or disability; by
   the Executive for Good Reason.  If, during the Employment Period, the
   Company terminates the Executive's employment, other than for Cause or
   Disability, or the Executive terminates employment for Good Reason, the
   Company shall continue to provide the Executive with the compensation and
   benefits set forth in paragraphs (a), (b) and (c) of Section 3 as if he
   had remained employed by the Company pursuant to this Agreement through
   the end of the Employment Period and then retired (at which time he will
   be treated as eligible for all retiree welfare benefits and other benefits
   provided to retired senior executives, as set forth in Section 3(c)(ii)
   and (iii)); PROVIDED, that the Incentive Compensation for such period
   shall be based upon the target Incentive Compensation for the year in
   which the Date of Termination occurs; PROVIDED, further, that in lieu of
   stock options, restricted stock and other stock-based awards, the
   Executive shall be paid cash equal to the fair market value as of the Date
   of Termination (without regard to any restrictions and based upon a
   valuation model generally utilized for purposes of valuing comparable
   stock based compensation awards) of the stock options, restricted stock
   and other stock-based awards that would otherwise have been granted with
   such cash being paid within 90 days after the Date of Termination;
   PROVIDED, further, that to the extent any benefits described in paragraph
   (c) of Section 3 cannot be provided pursuant to the plan or program
   maintained by the Company for its executives, the Company shall provide
   such benefits outside such plan or program at no additional cost
   (including without limitation tax cost) to the Executive and his family;
   and PROVIDED, finally, that during any period when the Executive is
   eligible to receive benefits of the type described in clause (B) of
   paragraph (c)(iii) of Section 3 under another employer-provided plan, the
   benefits provided by the Company under paragraph (a) of Section 5 may be
   made secondary to those provided under another plan.  In addition to the
   foregoing, any restricted stock outstanding on the Date of Termination
   shall be fully vested as of the Date of Termination and all options
   outstanding on the Date of Termination shall be fully vested and
   exercisable and shall remain in effect and exercisable through the  end of
   their respective terms, without regard to the termination of the
   Executive's employment.  The payments and benefits provided pursuant to
   this paragraph (a) of Section 5 are intended as liquidated damages for a
   termination of the Executive's employment by the Company other than for
   Cause or Disability or for the actions of the Company leading to a
   termination of the Executive's employment by the Executive for Good
   Reason, and shall be the sole and exclusive remedy therefor.

               (b)   Death or Disability.  If the Executive's employment is
   terminated by reason of the Executive's death or Disability during the
   Employment Period, the Company shall pay to the Executive or, in the case

                                        6
<PAGE>

   of the Executive's death, to the Executive's designated beneficiaries (or,
   if there is no such beneficiary, to the Executive's estate or legal
   representative) in a lump sum in cash within 30 days after the Date of
   Termination, the sum of the following amounts (the "Accrued Obligations"): 
   (1) any portion of the Executive's Annual Base Salary through the Date of
   Termination that has not yet been paid; (2) an amount representing the
   target Incentive Compensation for the year that includes the Date of
   Termination, computed by assuming that the amount of all such target
   Incentive Compensation would be equal to the amount of such target
   Incentive Compensation that the Executive would have been eligible to earn
   for such period, and multiplying that amount by a fraction, the numerator
   of which is the number of days in such period through the Date of
   Termination, and the denominator of which is the total number of days in
   the relevant period (3) any compensation previously deferred by the
   Executive (together with any accrued interest or earnings thereon) that
   has not yet been paid; and (4) any accrued but unpaid Incentive
   Compensation and vacation pay; and the Company shall have no further
   obligations under this Agreement, except as specified in Section 6 below. 
   If the Executive's employment is terminated by reason of Disability, he
   shall be entitled to receive the maximum disability payments which can be
   provided under the disability plans described in Section 3(c)(ii),
   reduced, however, by actual disability benefits received under such plans.

               (c) By the Company for Cause; by the Executive other than for
   Good Reason.  If the Executive's employment is terminated by the Company
   for Cause during the Employment Period, the Company shall pay the
   Executive the Annual Base Salary through the Date of Termination and the
   amount of any compensation previously deferred by the Executive (together
   with any accrued interest or earnings thereon), in each case to the extent
   not yet paid, and the Company shall have no further obligations under this
   Agreement, except as specified in Section 6 below. If the Executive
   voluntarily terminates employment during the Employment Period, other than
   for Good Reason, the Company shall pay the Accrued Obligations to the
   Executive in a lump sum in cash within 30 days of the Date of Termination,
   and the Company shall have no further obligations under this Agreement,
   except as specified in Section 6 below. 

         6.    Non-Exclusivity of Rights. Nothing in this Agreement shall
   prevent or limit the Executive's continuing or future participation in any
   plan, program, policy or practice provided by the Company or any of its
   affiliated companies for which the Executive may qualify, nor, subject to
   paragraph (f) of Section 12, shall anything in this Agreement limit or
   otherwise affect such rights as the Executive may have under any contract
   or agreement with the Company or any of its affiliated companies. Vested
   benefits and other amounts that the Executive is otherwise entitled to
   receive under the SERP or any other plan, policy, practice or program of,
   or any contract or agreement with, the Company or any of its affiliated
   companies on or after the Date of Termination shall be payable in
   accordance with the terms of each such plan, policy, practice, program,
   contract or agreement, as the case may be, except as explicitly modified
   by this Agreement. 

         7.    Full Settlement.  The Company's obligation to make the
   payments provided for in, and otherwise to perform its obligations
   under, this Agreement shall not be affected by any set-off,
   counterclaim, recoupment, defense or other claim, right or action that the
   Company may have against the Executive or others. In no event shall the
   Executive be obligated to seek other employment or take any other action
   by way of mitigation of the amounts payable to the Executive under any of
   the provisions of this Agreement and, except as specifically provided in
   paragraph (a) of Section 5 with respect to benefits described in clause

                                        7
<PAGE>

   (B) of paragraph (c)(iii) of Section 3, such amounts shall not be reduced,
   regardless of whether the Executive obtains other employment. 

         8.    Non-Competition Provision and Confidential Information. 
          
               (a) Without prior written consent of the Company, for the
   greater of (i) the twenty-four (24) month period following the Date of
   Termination, or (ii) the remaining term of this Agreement, the Executive
   shall not, as a shareholder, officer, director, partner, consultant, or
   otherwise, engage directly or indirectly in any business or enterprise
   which is "in competition" with the Company or its successors or assigns;
   provided, however, that the Executive's ownership of less than five
   percent of the issued and outstanding voting securities of a publicly-
   traded company shall not be deemed to constitute such competition.  A
   business or enterprise is deemed to be "in competition" if it is engaged
   in the business of generation, purchase, transmission, distribution, or
   sale of  electricity, or in the purchase, transmission, distribution, sale
   or transportation of natural gas within the States of Colorado, New
   Mexico, Texas, Wyoming, Kansas or Oklahoma.  

               (b) The Executive shall hold in a fiduciary capacity for the
   benefit of the Company all secret or confidential information, knowledge
   or data relating to the Company or any of its affiliated companies and
   their respective businesses that the Executive obtains during the
   Executive's employment by the Company or any of its affiliated companies
   and that is not public knowledge (other than as a result of the
   Executive's violation of this Section 8) ("Confidential Information"). The
   Executive shall not communicate, divulge or disseminate Confidential
   Information at any time during or after the Executive's employment with
   the Company, except with the prior written consent of the Company or as
   otherwise required by law or legal process. In no event shall any asserted
   violation of the provisions of this Section 8 constitute a basis for
   deferring or withholding any amounts otherwise payable to the Executive
   under this Agreement. 

         9.    Certain Additional Payments by the Company.

               (a) Anything in this Agreement to the contrary
   notwithstanding, in the event it shall be determined that any payment or
   distribution by the Company to or for the benefit of the Executive
   (whether paid or payable or distributed or distributable pursuant to the
   terms of this Agreement or otherwise, but determined without regard to any
   additional payments required under this Section 9) (a "Payment") would be
   subject to the excise tax imposed by Section 4999 of the Internal Revenue
   Code of 1986, as amended (the "Code") or any interest or penalties are
   incurred by the Executive with respect to such excise tax (such excise
   tax, together with any such interest and penalties, are hereinafter
   collectively referred to as the "Excise Tax"), then the Executive shall be
   entitled to receive an additional payment (a "Gross-Up Payment") in an
   amount such that after payment by the Executive of all taxes (including
   any interest or penalties imposed with respect to such taxes), including,
   without limitation, any income taxes (and any interest and penalties
   imposed with respect thereto) and Excise Tax imposed upon the Gross-Up
   Payment, the Executive retains an amount of the Gross-Up Payment equal to
   the Excise Tax imposed upon the Payments. 

               (b)   Subject to the provisions of paragraph (c) of this
   Section 9, all determinations required to be made under this Section 9,
   including whether and when a Gross-Up Payment is required and the amount
   of such Gross-up Payment and the assumptions to be utilized in arriving at
   such determination, shall be made by a nationally recognized certified

                                        8
<PAGE>

   public accounting firm designated by the Executive (the "Accounting
   Firm"), which shall provide detailed supporting calculations both to the
   Company and the Executive within 15 business days of the receipt of notice
   from the Executive that there has been a Payment, or such earlier time as
   is requested by the Company.  All fees and expenses of the Accounting Firm
   shall be borne solely by the Company. Any Gross-Up Payment, as determined
   pursuant to this Section 9, shall be paid by the Company to the Executive
   within five days of the receipt of the Accounting Firm's determination.
   Any determination by the Accounting Firm shall be binding upon the Company
   and the Executive. As a result of the uncertainty in the application of
   Section 4999 of the Code at the time of the initial determination by the
   Accounting Firm hereunder, it is possible that Gross-Up Payments which
   will not have been made by the Company should have been made
   ("Underpayment") consistent with the calculations required to be made
   hereunder. In the event that the Company exhausts its remedies pursuant to
   paragraph (c) of this Section 9 and the Executive thereafter is required
   to make a payment of any Excise Tax, the Accounting Firm shall determine
   the amount of the Underpayment that has occurred and any such Underpayment
   shall be promptly paid by the Company to or for the benefit of the
   Executive. 

               (c)   The Executive shall notify the Company in writing of any
   claim by the Internal Revenue Service that, if successful, would require
   the payment by the Company of the Gross-Up Payment. Such notification
   shall be given as soon as practicable but no later than ten business days
   after the Executive is informed in writing of such claim and shall apprise
   the Company of the nature of such claim and the date on which such claim
   is requested to be paid. The Executive shall not pay such claim prior to
   the expiration of the 30-day period following the date on which it gives
   such notice to the Company (or such shorter period ending on the date that
   any payment of taxes with respect to such claim is due). If the Company
   notifies the Executive in writing prior to the expiration of such period
   that it desires to contest such claim, the Executive shall: 

                     (i)        give the Company any information reasonably
   requested by the Company relating to such claim, 

                     (ii)       take such action in connection with contesting
   such claim as the Company shall reasonably request in writing from time to
   time, including, without limitation, accepting legal representation with
   respect to such claim by an attorney reasonably selected by the Company, 

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

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

         PROVIDED, however, that the Company shall bear and pay directly all
   costs and expenses (including additional interest and penalties) incurred
   in connection with such contest and shall indemnify and hold the Executive
   harmless, on an after-tax basis, for any Excise Tax or income tax
   (including interest and penalties with respect thereto) imposed as a
   result of such representation and payment of costs and expenses. Without
   limitation on the foregoing provisions of this paragraph (c) of Section 9,
   the Company shall control all proceedings taken in connection with such
   contest and, at its sole option, may pursue or forego any and all
   administrative appeals, proceedings, hearings and conferences with the
   taxing authority in respect of such claim and may, at its sole option,
   either direct the Executive to pay the tax claimed and sue for a refund or
   contest the claim in any permissible manner, and the Executive agrees to

                                        9
<PAGE>

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

               (d)   If, after the receipt by the Executive of an amount
   advanced by the Company pursuant to paragraph (c) of this Section 9, the
   Executive becomes entitled to receive any refund with respect to such
   claim, the Executive shall (subject to the Company's complying with the
   requirements of paragraph (c) of this Section 9) promptly pay to the
   Company the amount of such refund (together with any interest paid or
   credited thereon after taxes applicable thereto). If after the receipt by
   the Executive of an amount advanced by the Company pursuant to paragraph
   (c) of this Section 9, a determination is made that the Executive shall
   not be entitled to any refund with respect to such claim and the Company
   does not notify the Executive in writing of its intent to contest such
   denial of refund prior to the expiration of 30 days after such
   determination, then such advance shall be forgiven and shall not be
   required to be repaid and the amount of such advance shall offset, to the
   extent thereof, the amount of Gross-Up Payment required to be paid. 

         10.   Attorneys' Fees.  The Company agrees to pay, as incurred, to
   the fullest extent permitted by law, all legal fees and expenses that the
   Executive may reasonably incur as a result of any contest (regardless of
   the outcome) by the Company, the Executive or others of the validity or
   enforceability of or liability under, or otherwise involving, any
   provision of this Agreement, together with interest on any delayed payment
   at the applicable federal rate provided for in Section 7872(f)(2)(A) of
   the Code. 

         11.   Successors.

               (a)   This Agreement is personal to the Executive and, without
   the prior written consent of the Company, shall not be assignable by the
   Executive otherwise than by will or the laws of descent and distribution.
   This Agreement shall inure to the benefit of and be enforceable by the
   Executive's legal representatives. 

               (b)   This Agreement shall inure to the benefit of and be
   binding upon the Company and its successors and assigns. 

               (c)   The Company shall require any successor (whether direct
   or indirect, by purchase, merger, consolidation or otherwise) to all or
   substantially all of the business and/or assets of the Company expressly
   to assume and agree to perform this Agreement in the same manner and to
   the same extent that the Company would have been required to perform it if
   no such succession had taken place. As used in this Agreement, "Company"
   shall mean both the Company as defined above and any such successor that

                                        10
<PAGE>

   assumes and agrees to perform this Agreement, by operation of law or
   otherwise. 

         12.   Miscellaneous.

               (a)   This Agreement shall be governed by, and construed in
   accordance with, the laws of the State of Colorado, without reference to
   principles of conflict of laws. The captions of this Agreement are not
   part of the provisions hereof and shall have no force or effect. This
   Agreement may not be amended or modified except by a written agreement
   executed by the parties hereto or their respective successors and legal
   representatives. 

               (b) All notices and other communications under this Agreement
   shall be in writing and shall be given by hand delivery to the other party
   or by registered or certified mail, return receipt requested, postage
   prepaid, addressed as follows: 

   If to the Executive: 
                                Wayne H. Brunetti
                                295 High Street
                                Denver, CO  80209

   If to the Company: 
                                M-P New Co.
                                1225 17th Street
                                Denver, CO  80202
                                Attention: General Counsel 

   or to such other address as either party furnishes to the other in writing
   in accordance with this paragraph (b) of Section 12. Notices and
   communications shall be effective when actually received by the addressee.


               (c)   The invalidity or unenforceability of any provision of
   this Agreement shall not affect the validity or enforceability of any
   other provision of this Agreement. If any provision of this Agreement
   shall be held invalid or unenforceable in part, the remaining portion of
   such provision, together with all other provisions of this Agreement,
   shall remain valid and enforceable and continue in full force and effect
   to the fullest extent consistent with law. 

               (d)   Notwithstanding any other provision of this Agreement,
   the Company may withhold from amounts payable under this Agreement all
   federal, state, local and foreign taxes that are required to be withheld
   by applicable laws or regulations. 

               (e)   The Executive's or the Company's failure to insist upon
   strict compliance with any provision of, or to assert any right under,
   this Agreement (including, without limitation, the right of the Executive
   to terminate employment for Good Reason pursuant to paragraph (c) of
   Section 4 of this Agreement) shall not be deemed to be a waiver of such
   provision or right or of any other provision of or right under this
   Agreement. 

               (f)   The Executive and the Company acknowledge that this
   Agreement supersedes and terminates any other severance and employment
   agreements between the Executive and the Company, PSC or the Company's
   affiliates. 

                                        11
<PAGE>

               (g)   The rights and benefits of the Executive under this
   Agreement may not be anticipated, assigned, alienated or subject to
   attachment, garnishment, levy, execution or other legal or equitable
   process except as required by law. Any attempt by the Executive to
   anticipate, alienate assign, sell, transfer, pledge, encumber or charge
   the same shall be void. Payments hereunder shall not be considered assets
   of the Executive in the event of insolvency or bankruptcy. 

               (h)   This Agreement may be executed in several counterparts,
   each of which shall be deemed an original, and said counterparts shall
   constitute but one and the same instrument. 

         IN WITNESS WHEREOF, the Executive has hereunto set the Executive's
   hand and, pursuant to the authorization of its Board of Directors, the
   Company has caused this Agreement to be executed in its name on its
   behalf, all as of the day and year first above written. 


                                       _______________________________ 
                                       Wayne H. Brunetti


                                       COMPANY



                                       By:______________________________



                                        12
<PAGE>


                         Joint News Release



   Public Service Co. of Colorado      Southwestern Public Service Company
   1225 17th St.                       P.O. Box 1261
   Denver, Colorado  80202             Amarillo, Texas 79710
   (303) 294-8900                      (806) 378-2121

   For Release 6:30 MDT; 7:30 CDT -- August 23, 1995

            PSCo and SPS to Combine in Merger of Equals
       Utilities Join to Compete in Evolving Energy Industry

        DENVER, COLO. AND AMARILLO, TEXAS --  Southwestern Public
   Service  Company (NYSE:SPS),  based  in  Amarillo, Texas,  and
   Denver-based  Public   Service  Co.  of   Colorado  (NYSE:PSR)
   announced Wednesday  that they have entered  into a definitive
   merger agreement to combine two low-cost utilities and form  a
   new energy services holding company that will cover one of the
   largest geographic areas in the country.
        This "merger of equals" - which is subject to approval by
   shareholders   of  both   companies  and   various  regulatory
   authorities  - was  unanimously  approved by  both  companies'
   boards of directors in separate meetings Tuesday.
        Bill D. Helton, SPS chairman and chief executive officer,
   and Del Hock, PSCo chairman and chief  executive officer, said
   the new company will build on the strengths of each partner.
        "We are extremely pleased with the natural synergies  and
   resulting savings of combining our  two companies, and we will
   be very well-positioned  to succeed in  our changing  electric
   utility industry," Hock said.
        Helton said  the  two companies  are  a natural  fit  and
   complement  each  other in  many  areas.   "As  both companies
   considered whether a merger was the right move, both wanted to
   ensure joining with  a company with low rates.   We found that
   in  each other.   The combination  will result  in one  of the
   premier low-cost energy providers of the future."
        Based  on fiscal  1994 results,  the new  holding company
   will have combined annual revenues of approximately $3 billion
   and  total assets of approximately $6  billion.  The companies
   expect  to save  approximately  $770 million  in the  first 10
   years after the merger is completed.
        Upon  completion of  the merger,  holders of  PSCo common
   stock  will receive one share of the new holding company stock
   for each share  of PSCo  stock.  Holders  of SPS common  stock
   will receive  0.95 shares of  the new holding  company's stock
   for each share of SPS  stock.  As of August 4, 1995,  PSCo has
   63.1  million  common shares  outstanding,  and  SPS has  40.9
   million common shares outstanding.
        Based on the  number of common  shares outstanding,  PSCo
   shareholders will own 61.9 percent of the common equity of the
   new holding  company, while  SPS  shareholders will  own  38.1
   percent.   The current combined market  capitalization of PSCo
   and SPS will result in a $3.2 billion market capitalization of
   the new holding company.
        It is anticipated that the holding company will adopt the
   SPS dividend  payment level, adjusted for  the exchange ratio.
   Based  on the exchange ratio,  the pro forma  dividend for the
   new  company will  be  $2.32 per  share  on an  annual  basis,
   following completion of the merger.
        Debt  holders and  preferred  stockholders will  continue
   with their present holdings under existing terms.
<PAGE>
        According  to  Hock  and  Helton,  the  anticipated  $770
   million  savings  during  a  10-year  period  will  allow  the
   operating companies to  provide "very competitive" electricity
   rates in both service areas for many years to come.  They said
   specific rate  plans would  be  filed with  appropriate  state
   public utilities commissions and the Federal Energy Regulatory
   Commission in the near future.
        According to Helton, PSCo adds a faster-growing  service-
   area economy,  natural gas utility  operations, and innovative
   approaches to information technology and energy services.  SPS
   brings strong generation  and engineering, diversity  of power
   plants and fuels, and success with wholesale markets  and non-
   regulated generation projects.
        Hock  noted that  customers also  would benefit  from the
   adoption of the "best practices"  of each company, the sharing
   of generating  capacity and increased  leverage in purchasing.
   "We  will have lower fuel  costs for generation;  we can defer
   additional  generating  capacity;  and  we  can  reduce  total
   inventories," Hock said.
        The  new  company will  be  a  registered public  utility
   holding company,  which will be  the parent  company for  both
   Public Service Co. of Colorado and Southwestern Public Service
   Company.  The corporate offices of the holding company will be
   in Denver,  with  significant  operating  functions  based  in
   Amarillo.   SPS   and  PSCo   will   maintain   their  company
   headquarters in Amarillo and Denver, respectively.  The  board
   of  the new  holding  company will  consist  of eight  current
   directors from PSCo and six current directors from SPS.
        Upon the expected completion of the merger in early 1997,
   PSCo Chairman  and  Chief  Executive  Officer  Del  Hock,  who
   currently  is 60  years old,  will retire.   SPS  Chairman and
   Chief Executive Officer  Bill D. Helton,  56, will become  the
   company's  chairman  and   chief  executive  officer.     PSCo
   President and  Chief Operating Officer Wayne  H. Brunetti, 52,
   will  become  vice  chairman, president  and  chief  operating
   officer of the new company.
        On  June  30, 1999  (or  two-and-a-half  years after  the
   merger is  completed,  whichever comes  later), Brunetti  will
   assume  the responsibilities  of CEO,  and Helton  will remain
   chairman.  On May  31, 2001, Helton will retire,  and Brunetti
   will add the responsibilities of chairman of the board.
        The merger is subject to  approval by the shareholders of
   both companies.   The merger  is also subject  to approval  or
   regulatory review by the Federal Energy Regulatory Commission,
   the  Securities  and Exchange  Commission,  the Federal  Trade
   Commission, the Department of Justice,  the Nuclear Regulatory
   Commission  and  state  regulators  in  Texas,  Colorado,  New
   Mexico, Wyoming,  Oklahoma and  Kansas.   The  companies  have
   received  fairness opinions  from Barr  Devlin  Associates for
   PSCo and Dillon, Read & Co. for SPS.
        Brunetti said the merger agreement has the key element to
   succeed.   "I  have  long believed  that  if you  can  satisfy
   customers,   you  will   be  successful.     This   merger  is
   unquestionably a  step that enhances  our ability to  give our
   customers what  they want and what they want most of all - low
   price," Brunetti said.  "Price is the entry point into today's
   energy market."
        Brunetti  said   a  transition   team   -  made   up   of
   representatives of  both companies - would  be responsible for
   making recommendations to cut costs  and take advantage of the
   natural synergies.   He said he  expected employee  reductions
<PAGE>
   would be  approximately 8  percent  of the  consolidated  work
   force  of both  companies.   That  figure  equals 550  to  600
   positions  out of  the combined  work forces  of approximately
   7,000 employees.
        "We pledge  to keep employees, customers and shareholders
   informed throughout this transition period," Brunetti said.
        After the merger, a new  transmission line will be  built
   that connects SPS  with PSCo through  a high voltage,  direct-
   current interconnection.
        Helton said the interconnection will  enhance competition
   in the  region's wholesale  power markets  and will  make  the
   generation and fuel savings possible.
        Upon completion of the merger, the new company will serve
   approximately  1.5 million  electric  customers  in  Colorado,
   Texas, New Mexico, Wyoming, Oklahoma  and Kansas.  The company
   also will provide natural gas service to  933,000 customers in
   Colorado and Wyoming.
        SPS, based in  Amarillo, is a  regional electric  utility
   that primarily provides  service to a population  of about one
   million people in a 52,000-square-mile area comprising eastern
   and southeastern New Mexico, the South Plains and Panhandle of
   Texas, the Oklahoma  Panhandle and southwestern  Kansas.   The
   company also  made wholesale  power  sales to  other  electric
   systems in 15 states last year.
        SPS's generating capacity  is 52 percent  coal-fueled and
   48  percent  from other  fuels,  primarily natural  gas.   The
   company has 12 power plants throughout its system.
        SPS subsidiary Utility  Engineering Corporation  provides
   engineering, design and construction management services to  a
   variety of industries.  Another subsidiary, Quixx Corporation,
   is involved  in  a  number  of  non-utility  power  generation
   projects, both nationally and internationally.
        Public Service Co.  of Colorado is  an electric,  natural
   gas  and thermal energy  utility, which  serves 32,000-square-
   mile area and a population of approximately 2.8 million people
   in  Colorado and in the Cheyenne, Wyo. area.  Headquartered in
   Denver, the company operates eight steam-electric plants, nine
   hydroelectric  facilities,  a downtown  Denver  thermal energy
   service and an extensive natural gas system.
        PSCo's fuel  for generation  is approximately 99  percent
   coal and 1 percent  natural gas.  Hydroelectric power  plays a
   role in this mix during the warmer months of the year.
        PSCo's subsidiary,  e prime, was started  in January 1995
   to provide value-added,  energy-related products and  services
   to energy-using  customers and  to  selected segments  of  the
   utility industry in  the United States.   Another  subsidiary,
   Natural Fuels Corp., is building an infrastructure for natural
   gas  vehicles,  and  it  sells  compressed  natural  gas  as a
   transportation fuel.
<PAGE>



                                   AMENDMENT


            AMENDMENT, dated as of August 22, 1995, to the Rights Agreement,
dated as of February 26, 1991 (the "Rights Agreement"), between Public Service
Company of Colorado (the "Company") and Mellon Bank, N.A., 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 thereof:

            ; provided, however, that M-P New Co. shall not be
            deemed an "Acquiring Person" as a result of the
            execution, delivery and performance of the Agreement
            and Plan of Reorganization (the "Reorganization
            Agreement") dated as of August 22, 1995, among Public
            Service Company of Colorado, Southwestern Public
            Service Company and M-P New Co. or the consummation of
            the transactions contemplated in the Reorganization
            Agreement.  

            2.    Clause (b) of Section 13 of the Rights Agreement is hereby
amended to read in its entirety as follows: 

            (b)  other than pursuant to the Reorganization
            Agreement, any Person shall consolidate with the
            Company, or merge with and into the Company and the
            Company shall be the continuing or surviving
            corporation of such merger and, in connection with
            such merger, all or part of the Common Shares shall be
            changed into or exchanged for stock or other
            securities of any Person (including the Company) or
            cash or any other property, or 

            3.    This Amendment shall be governed by and construed in
accordance with the laws of the State of Colorado applicable to contracts to
be made and performed entirely within such State.

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

            5.    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 shall together constitute but one and the
same instrument.

            IN WITNESS WHEREOF, Public Service Company of Colorado and the
Rights Agent have executed this Amendment as of the date first above written.
<PAGE>
                                    PUBLIC SERVICE COMPANY OF COLORADO

                                         /s/ R. C. Kelly
                                    By: ______________________________


ATTEST:


 /s/ Teresa S. Madden
_______________________



                                    MELLON BANK, N.A.


                                        /s/ Laura E. Kennedy
                                    By: _____________________


ATTEST:


/s/ Stacy Tenken
_______________________
<PAGE>



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