UNISOURCE ENERGY CORP
S-4/A, 1998-08-14
ELECTRIC SERVICES
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          As filed with the Securities and Exchange
          Commission on August 14, 1998
                                                 Registration No. 333-60809
          =================================================================


                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549

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

                                   AMENDMENT NO. 1 TO
                                       FORM S-4
    
               REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

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

                             UNISOURCE ENERGY CORPORATION
                (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                       ARIZONA                        86-0786732

                      (State or                    (I.R.S. Employer
                 other jurisdiction              Identification No.)
                  of incorporation
                  or organization)


                                220 WEST SIXTH STREET
                               TUCSON, ARIZONA,  85701
                                    (520) 571-4000

                 (Address, including zip code, and telephone number,
                                 including area code,
                     of registrant's principal executive offices)


            Dennis R. Nelson, Esq.                   John T. Hood, Esq.
               UniSource Energy                   J. Anthony Terrell, Esq.
                 Corporation                      Thelen Reid & Priest LLP
            220 West Sixth Street                    40 West 57th Street
           Tucson, Arizona,  85701                New York, New York 10019
                (520) 571-4000                         (212) 603-2000

                      (Names and addresses, including zip codes,
                     and telephone numbers, including area codes,
                                of agents for service)

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

                  Approximate date of commencement of proposed sale
                           of the securities to the public:

                          AS SOON AS PRACTICABLE AFTER THIS
                      REGISTRATION STATEMENT BECOMES EFFECTIVE.
   
    
                                  ----------------

               THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON
          SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE
          DATE UNTIL THE REGISTRANT SHALL FILE A FURTHER AMENDMENT WHICH
          SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL
          THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
          THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE REGISTRATION
          STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE SECURITIES
          AND EXCHANGE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
          MAY DETERMINE.

          =================================================================


          <PAGE>


   
                  Subject to completion, dated August 14, 1998
    
                             UNISOURCE ENERGY CORPORATION

                                  OFFER TO EXCHANGE


                                      ANY OR ALL
                    WARRANTS TO PURCHASE SHARES OF COMMON STOCK OF
                            TUCSON ELECTRIC POWER COMPANY
                                         FOR
           WARRANTS EXPIRING IN 1999 TO PURCHASE SHARES OF COMMON STOCK OF
                             UNISOURCE ENERGY CORPORATION
                                         AND
           WARRANTS EXPIRING IN 2000 TO PURCHASE SHARES OF COMMON STOCK OF
                             UNISOURCE ENERGY CORPORATION
                     THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M.
              NEW YORK CITY TIME,                , 1998 UNLESS EXTENDED
                                  ---------------  

               UniSource Energy Corporation, an Arizona corporation (the
          "Company"), hereby offers upon the terms and subject to the
          conditions set forth in this Prospectus and the accompanying
          Letter of Transmittal (the "Letter of Transmittal") to exchange
          (the "Exchange Offer") any and all outstanding warrants to
          purchase shares of common stock of Tucson Electric Power Company,
          an Arizona corporation and wholly-owned subsidiary of the Company
          ("TEP") (the "TEP Warrants") for Warrants expiring in 1999 to
          purchase shares of common stock of the Company (the "1999 UNS
          Warrants") and Warrants expiring in 2000 to purchase shares of
          common stock of the Company (the "2000 UNS Warrants" and,
          together with the 1999 UNS Warrants, the "UNS Warrants").  For
          each TEP Warrant surrendered to and accepted by the Company
          pursuant to the Exchange Offer, the Holder (as defined herein) of
          such TEP Warrant will receive 0.20 1999 UNS Warrant and      2000
                                                                 -----
          UNS Warrant.

               The UNS Warrants will be issued under and be entitled to all
          of the rights and benefits of, and subject to the limitations
          under, the Warrant Agreement, to be dated as of the Expiration
          Date (as hereinafter defined), between the Company and The Bank
          of New York, as Warrant Agent (the "Warrant Agent") (the "Warrant
          Agreement").  See "DESCRIPTION OF THE UNS WARRANTS." 

               The form and terms of the 1999 UNS Warrants and 2000 UNS
          Warrants are substantially the same as the form and terms of the
          TEP Warrants except that each 1999 UNS Warrant will entitle the
          Holder to purchase one share of Common Stock (the "Common Stock")
          of the Company at a purchase price of $16.00 through and
          including March 15, 1999 and each 2000 UNS Warrant will entitle
          the Holder to purchase one share of Company Common Stock at a
          purchase price of $16.00 through and including December 15, 2000. 
          See "DIFFERENCES BETWEEN THE TEP WARRANTS AND THE UNS WARRANTS."

               The Company will accept for exchange any and all TEP
          Warrants which are properly tendered to The Bank of New York, as
          Exchange Agent, in the Exchange Offer prior to 5:00 p.m., New
          York City time, on September    , 1998, unless the Exchange Offer
                                      ----
          is extended by the Company at its sole discretion (if and as
          extended, the "Expiration Date").  Tenders of TEP Warrants may be
          withdrawn at any time prior to 5:00 p.m., New York City time, on
          the Expiration Date.  See "THE EXCHANGE OFFER."

                THE EXCHANGE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE 
               AT 5:00 P.M., NEW YORK CITY TIME ON SEPTEMBER    , 1998,
                                                             ---
                        UNLESS THE EXCHANGE OFFER IS EXTENDED.

               Holders of TEP Warrants not tendered and accepted in the
          Exchange Offer will continue to hold such TEP Warrants and will
          be entitled to all the rights and benefits of, and be subject to
          the limitations under, the Warrant Agreement, dated December 15,
          1992 among certain institutional investors (the "Initial
          Registered Holders") and TEP (the "TEP Warrant Agreement").  The
          Company will pay all the expenses incurred by it incident to the
          Exchange Offer.  See "THE EXCHANGE OFFER."

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

                   SEE "RISK FACTORS" ON PAGE 8 FOR A DISCUSSION OF
               CERTAIN MATTERS THAT SHOULD BE CONSIDERED IN CONNECTION
            WITH THE EXCHANGE OFFER AND AN INVESTMENT IN THE UNS WARRANTS

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

                THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED
                 BY THE SECURITIES AND EXCHANGE COMMISSION OR BY ANY
                STATE SECURITIES COMMISSION NOR HAS THE SECURITIES AND
                EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
               PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
              ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                The date of this Prospectus is                , 1998.
                                               ---------------

          Information contained herein is subject to completion or
          amendment.  A registration statement relating to these securities
          has been filed with the Securities and Exchange Commission. 
          These securities may not be sold nor may offers to buy be
          accepted prior to the time the registration statement becomes
          effective.  This prospectus shall not constitute an offer to sell
          or the solicitation of an offer to buy nor shall there be any
          sale of these securities in any jurisdiction in which such offer,
          solicitation or sale would be unlawful prior to registration or
          qualification under the securities laws of any such jurisdiction.


          <PAGE>


                                  TABLE OF CONTENTS
                                                                       PAGE
                                                                       ----

          AVAILABLE INFORMATION . . . . . . . . . . . . . . . . . . . .  3

          INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE. . . . . . . . 3

          SUMMARY INFORMATION. . . . . . . . . . . . . . . . . . . . . . 4

          CERTAIN RISK FACTORS. . . . . . . . . . . . . . . . . . . . .  8

          THE COMPANY. . . . . . . . . . . . . . . . . . . . . . . . .  10

          THE EXCHANGE OFFER. . . . . . . . . . . . . . . . . . . . . . 13

          USE OF PROCEEDS. . . . . . . . . . . . . . . . . . . . . . .  17

          DIFFERENCES BETWEEN THE TEP WARRANTS 
          AND THE UNS WARRANTS. . . . . . . . . . . . . . . . . . . . . 17

          DESCRIPTION OF THE UNS WARRANTS. . . . . . . . . . . . . . .  17

          DESCRIPTION OF CAPITAL STOCK. . . . . . . . . . . . . . . . . 22


                                                                       PAGE
                                                                       ----

          CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES. . . .  23

          EXPERTS. . . . . . . . . . . . . . . . . . . . . . . . . . .  24


          APPENDIX A -   Form of Warrant Agreement relating
                         to the UNS Warrants

          APPENDIX B -   Form of Warrant Agreement relating
                         to the UNS Warrants marked to show
                         changes from Warrant Agreement
                         relating to the TEP Warrants

                                       2


          <PAGE>


               NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO
          MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
          PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR
          REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
          BY THE COMPANY.  NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY
          SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY
          IMPLICATION THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS
          OF ANY TIME SUBSEQUENT TO THE DATE OF SUCH INFORMATION.  THIS
          PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR THE
          SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE
          SECURITIES DESCRIBED IN THIS PROSPECTUS OR AN OFFER TO SELL OR
          THE SOLICITATION OF ANY OFFER TO BUY SUCH SECURITIES IN ANY
          CIRCUMSTANCES IN WHICH SUCH OFFER OR SOLICITATION IS UNLAWFUL.


                                AVAILABLE INFORMATION

               The Company and TEP are subject to the informational
          requirements of the Securities Exchange Act of 1934 (the
          "Exchange Act") and in accordance therewith the Company and TEP
          file reports, proxy statements and other information with the
          Securities and Exchange Commission (the "SEC").  Such reports,
          proxy statements and other information can be inspected and
          copied at the offices of the SEC at the public reference
          facilities maintained by the SEC at Room 1024, 450 Fifth Street,
          N.W., Washington, D.C. 20549, and the Regional Offices of the SEC
          located at 500 West Madison Street, 14th Floor, Chicago, Illinois
          60661-2511 and 7 World Trade Center, Suite 1300, New York, New
          York 10048.  Copies of such documents can be obtained from the
          Public Reference Section of the SEC at prescribed rates by
          writing to it at 450 Fifth Street, N.W., Washington,  D.C. 20549. 
          The SEC maintains a web site on the Internet that contains
          reports, proxy statements and other information regarding the
          Company and TEP; the address of such site is http:www.sec.gov. 
          Reports, proxy statements and other information concerning the
          Company and TEP are also available for inspection and copying at
          the offices of the New York Stock Exchange, Inc., 20 Broad
          Street, New York, New York 10005.

                   INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
   

               Each of the Company's and TEP's Annual Report on Form 10-K
          for the year ended December 31, 1997, as amended by Form 10-K/A,
          dated March 5, 1998, (the "1997 10-K"), Quarterly Reports on Form
          10-Q for the quarters ended March 31, 1998 and June 30, 1998 (the
          "Second Quarter 10-Q") and Current Reports on Form 8-K dated
          January 6, 1998, June 26, 1998, July 16, 1998 and July 22, 1998
          which have been filed by the Company and TEP with the SEC
          pursuant to the Exchange Act, are incorporated in this Prospectus
          by reference.  All documents subsequently filed by the Company or
          TEP pursuant to Section 13 or 14 of the Exchange Act, prior to
          the termination of the Exchange Offer made by this Prospectus,
          shall be deemed to be incorporated herein by reference and to be
          a part hereof from the respective dates of filing thereof.  All
          documents incorporated herein by reference, whether pursuant to
          this paragraph or the immediately preceding paragraph, are
          hereinafter referred to as the "Incorporated Documents".  Any
          statement contained in an Incorporated Document shall be deemed
          to be modified or superseded for all purposes to the extent that
          a statement contained in any subsequently filed Incorporated
          Document modifies or replaces such statement.
    
               THE COMPANY AND TEP WILL PROVIDE WITHOUT CHARGE TO EACH
          PERSON TO WHOM THE PROSPECTUS IS DELIVERED, UPON THE REQUEST OF
          ANY SUCH PERSON, A COPY OF ANY OR ALL OF THE DOCUMENTS
          INCORPORATED HEREIN BY REFERENCE, EXCLUDING THE EXHIBITS THERETO. 
          REQUESTS FOR SUCH DOCUMENTS SHOULD BE DIRECTED TO KEVIN P.
          LARSON, VICE PRESIDENT AND TREASURER OF TEP, BY MAIL AT 220 WEST
          SIXTH STREET, TUCSON, ARIZONA 85702, OR BY TELEPHONE AT (520)
          884-3660.

                                       3

          <PAGE>


                                 SUMMARY INFORMATION

               The following summary information is qualified in its
          entirety by the information contained elsewhere in this
          Prospectus and in the Incorporated Documents.

                                     THE COMPANY

               The Company was incorporated under the laws of the State of
          Arizona on March 8, 1995.  The Company is a holding company which
          owns all of the outstanding common stock of TEP and MEH
          Corporation ("MEH").  On January 1, 1998,  TEP and the Company
          completed a statutory share exchange, pursuant to which the
          outstanding common stock of TEP was exchanged, on a share-for-
          share basis, for shares of Company common stock, no par value. 
          Following the share exchange, TEP transferred the stock of its
          subsidiary, MEH, to the Company in exchange for a promissory note
          in the approximate amount of $95 million.  The Company's stock is
          traded on the New York and Pacific Stock Exchanges under the
          ticker symbol UNS.

               TEP is the principal subsidiary of the Company and accounts
          for substantially all of its assets, revenues and net income. 
          TEP is an operating public utility engaged in delivering energy
          services to retail customers primarily in the Tucson, Arizona
          metropolitan area and to wholesale customers throughout the
          Western United States.  As a public utility, TEP falls under the
          jurisdiction of the Arizona Corporation Commission which has the
          authority to approve rates and certain other corporate actions.  

               TEP provides electric power to approximately 317,000 retail
          customers.  In 1997, TEP generated and sold more than 7,400
          gigawatt hours of energy to retail customers and 3,400 gigawatt
          hours to other customers at wholesale.  Operating revenues from
          such sales exceeded $729 million.  TEP owns or leases 1,896 MW of
          generating capacity located in Arizona and New Mexico.  TEP also
          has transmission and distribution assets to transmit electricity
          from TEP's remote generating facilities to the Tucson area for
          use by TEP's retail customers and to provide interconnections to
          neighboring utilities.


                               THE EXCHANGE OFFER


          THE EXCHANGE
          OFFER. . . . . .  The Company  is offering  to exchange 0.20
                            1999  UNS  Warrant and           2000  UNS
                                                    -------
                            Warrant for each TEP Warrant that is properly
                            tendered and  accepted.  The Company  will
                            issue  the 1999 UNS  Warrants and 2000 UNS
                            Warrants   on   or  promptly   after   the
                            Expiration Date.   As of  the date hereof,
                            there   are   12,054,279   TEP    Warrants
                            outstanding.  See "THE EXCHANGE OFFER."

          NO FRACTIONAL
          WARRANTS. . . . . No   certificate  representing  fractional
                            UNS Warrants  shall be issued pursuant  to
                            the   Exchange  Offer.     Fractional  UNS
                            Warrants  that  otherwise would  be issued
                            in  connection  with  the  Exchange  Offer
                            will  be rounded  up to the  nearest whole
                            UNS  Warrant.  See "THE  EXCHANGE OFFER --
                            No Fractional Warrants." 
          RIGHT TO
          TERMINATE OR
          AMEND THE
          EXCHANGE 
          OFFER. . . . . .  The   Exchange   Offer   is   subject   to
                            termination  or  amendment by  the Company
                            in  its   sole  discretion.     See   "THE
                            EXCHANGE  OFFER -  Right to  Terminate  or
                            Amend."


          EXPIRATION 
          DATE. . . . . . . The  Exchange  Offer  will expire  at 5:00
                            p.m., New  York City time,  on September  
                            ___, 1998, unless extended by the Company at
                            its  sole  discretion,  in which  case the
                            its sole discretion, in which case the
                            term  "Expiration  Date"  shall  mean  the
                            latest  date   and  time   to  which   the
                            Exchange Offer is extended.

                                       4

<PAGE>


          PROCEDURES FOR
          TENDERING TEP
          WARRANTS. . . . . Each  Holder  of  TEP Warrants  wishing to
                            participate  in  the Exchange  Offer  must
                            complete,  sign  and date  the  Letter  of
                            Transmittal,  or  a facsimile  thereof, in
                            accordance     with    the    instructions
                            contained herein and therein, and mail  or
                            otherwise   deliver    such   Letter    of
                            Transmittal, or  such facsimile,  together
                            with  such  TEP  Warrants  and  any  other
                            required  documentation  to  the  Exchange
                            Agent.


          SPECIAL
          PROCEDURES FOR
          BENEFICIAL
          OWNERS. . . . . . Any  beneficial  owner whose  interests in
                            the  TEP Warrants  are  registered  in the
                            name   of  a  broker,  dealer,  commercial
                            bank,  trust  company, nominee,  or  other
                            securities  intermediary and who wishes to
                            tender such TEP Warrants  in the  Exchange
                            Offer  should   contact  such   securities
                            intermediary  promptly and  instruct  such
                            securities  intermediary to tender on such
                            beneficial   owner's   behalf.      If   a
                            beneficial owner  wishes to tender on such
                            owner's   own  behalf,  such  owner  must,
                            prior  to  completing  and  executing  the
                            Letter  of Transmittal and delivering such
                            owner's   TEP  Warrants  to  the  Exchange
                            Agent,     either     make     appropriate
                            arrangements  to register ownership of the
                            TEP  Warrants  in  such  owner's  name  or
                            obtain  a  properly  completed  assignment
                            from  the  registered  Holder  of the  TEP
                            Warrants.    The  transfer  of  registered
                            ownership  may take  considerable time and
                            might  not   be  completed  prior  to  the
                            Expiration Date.

          WITHDRAWAL
          RIGHTS. . . . . . Tenders of  TEP Warrants  may be withdrawn
                            at any time  prior to 5:00 p.m., New  York
                            City time, on the Expiration Date.
          ACCEPTANCE OF TEP
          WARRANTS AND
          DELIVERY OF UNS
          WARRANTS. . . . . The Company  will accept  for exchange any
                            and all  TEP Warrants  which are  properly
                            tendered to  the Exchange  Agent prior  to
                            5:00  p.m., New  York  City time,  on  the
                            Expiration Date.  The  UNS Warrants issued
                            pursuant  to the  Exchange Offer  will  be
                            delivered   on   or  promptly   after  the
                            Expiration Date.  See  "THE EXCHANGE OFFER
                            - Terms of the Exchange Offer."

          USE OF            The  Company  will  not  receive any  cash
          PROCEEDS. . . . . proceeds from  the  issuance  of  the  UNS
                            Warrants in the  Exchange Offer.  See "USE
                            OF  PROCEEDS."  To  the extent that shares
                            of  Common Stock  are  purchased  from the
                            Company pursuant  to the  exercise of  the
                            UNS Warrants,  the Company  intends to use
                            the  net  proceeds for  general  corporate
                            purposes.

          TAX               An  exchange  of  UNS   Warrants  for  TEP
          CONSEQUENCES. . . Warrants  should   constitute  a   taxable
                            event  for  federal income  tax  purposes.
                            As a result, a  U.S. Holder will recognize
                            gain  or  loss  equal  to  the  difference
                            between   the  amount  realized  upon  the
                            exchange,  and such U.S. Holder's adjusted
                            tax    basis    in   the    TEP   Warrants
                            surrendered.   See  "CERTAIN UNITED STATES
                            FEDERAL INCOME TAX CONSEQUENCES".

          EXCHANGE AGENT. . The  Bank  of New  York  is  the  Exchange
                            Agent. Its telephone number  is (212) 815-
                            2499.  The  address of the Exchange  Agent
                            is  set forth  in  "THE  EXCHANGE OFFER  -
                            Exchange Agent."

                                       5
<PAGE>

                                THE TEP WARRANTS


          TEP WARRANTS. . . TEP  issued  an  aggregate  of  12,054,279
                            Common   Stock   Purchase   Warrants    on
                            December  15, 1992,  for the  purchase  of
                            approximately  2,410,855  shares  of   TEP
                            common  stock (adjusted for TEP's one-for-
                            five   reverse   stock  split   in   1996)
                            pursuant  to  the TEP  Warrant  Agreement.
                            The exercise terms are  five TEP  Warrants
                            plus  an  exercise  price  of  $16.00  per
                            share  of  TEP  common  stock.    The  TEP
                            Warrants  are  currently  exercisable  and
                            expire December 15, 2002.  

                            On January 1, 1998, TEP and the Company
                            completed a statutory share exchange (the
                            "Share Exchange"), pursuant to which the
                            outstanding common stock of TEP was
                            exchanged, on a share-for-share basis,
                            for shares of the Company's Common Stock. 
                            The consummation of the Share Exchange
                            did not convert the TEP Warrants into
                            warrants to purchase shares of Company
                            Common Stock.  TEP common stock is no
                            longer listed on any stock exchange and
                            there is no established market for
                            trading shares of TEP common stock.   




                                THE UNS WARRANTS

          GENERAL. . . . .  The  form and  terms of  the UNS  Warrants
                            are  substantially the  same as  the  form
                            and terms of the TEP Warrants except  that
                            each  1999 UNS  Warrant  will  entitle the
                            Holder to  purchase one  share of  Company
                            Common  Stock   at  a  purchase  price  of
                            $16.00  through  and including  March  15,
                            1999  and  each  2000  UNS  Warrant   will
                            entitle the  Holder to  purchase one share
                            of Company  Common  Stock  at  a  purchase
                            price  of  $16.00  through  and  including
                            December 15,  2000.  The  UNS Warrants are
                            issued by  the  Company  pursuant  to  the
                            Warrant Agreement.

          1999 UNS
          WARRANTS. . . . . Up  to  2,411,000  1999  UNS  Warrants  to
                            purchase  an  equal number  of  shares  of
                            Company Common Stock
          2000 UNS
          WARRANTS. . . . . Up to                   2000 UNS Warrants
                                 ------------------
                            to purchase  an equal number  of shares of
                            Company Common Stock.

          EXPIRATION. . . . The  1999   UNS  Warrants   and  2000  UNS
                            Warrants  will expire  on  March  15, 1999
                            and  December   15,  2000,   respectively.
                            Each  1999   UNS  Warrant   and  2000  UNS
                            Warrant  not exercised  on  or  before the
                            Warrant  Expiration   Date  shall   become
                            void.

          EXERCISE PRICE. . The  exercise  price  of   the  1999   UNS
                            Warrants and  2000 UNS  Warrants shall  be
                            $16.00  per share,  subject to adjustments
                            in certain circumstances.
          REDEMPTION. . . . The  1999   UNS  Warrants  and  2000   UNS
                            Warrants will  not be subject to mandatory
                            redemption by the Company.

          ANTIDILUTION. . . The  number of  shares of  Company  Common
                            Stock  purchasable  upon the  exercise  of
                            the UNS  Warrants and  the Exercise  Price
                            shall be  subject to adjustment from  time
                            to  time  in  certain circumstances.   See
                            "DESCRIPTION   OF   THE  UNS   WARRANTS  -
                            Adjustment  of  Exercise Price  and Number
                            of Shares of Common Stock."

          FORM OF WARRANT
          CERTIFICATE. . .  Certificates representing an aggregate  of
                            up to  2,411,000 1999 UNS  Warrants and   

                                     2000   UNS  Warrants   shall   be
                            --------
                            issued substantially in the form annexed hereto
                            as Exhibits A and B to Appendix A.

                                       6
<PAGE>


          EFFECT OF NOT
          TENDERING. . . .  Any  TEP  Warrant  not  tendered  in   the
                            Exchange  Offer  will  remain  outstanding
                            and will  be entitled to  such rights  and
                            benefits such  Holders have under the  TEP
                            Warrant Agreement.

          WARRANT AGENT. .  The Bank of New York


                                       7

          <PAGE>


                                 CERTAIN RISK FACTORS

               The UNS Warrants described herein and being offered hereby
          are subject to a number of material risks, and, therefore,
          involve a high degree of risk of loss.  The following summary of
          the principal factors that make the securities being offered an
          investment of high risk is qualified in its entirety by reference
          to the detailed information contained in the Incorporated
          Documents.  Prior to deciding whether or not to make an
          investment in the UNS Warrants being offered, investors should
          consider carefully all the information contained herein and in
          the Incorporated Documents.

          OVERVIEW

               The financial condition and results of operations of TEP are
          currently the principal factors affecting the financial condition
          and results of operations of the Company on an annual basis since
          TEP currently accounts for substantially all of the Company's
          assets, revenues and net income.

               The Company's and TEP's financial prospects are subject to
          significant regulatory, economic, and other uncertainties, some
          of which are beyond the Company's and TEP's control.  These
          uncertainties include the extent to which TEP, in light of its
          continued high financial and operating leverage, can alter
          operations and reduce costs in response to industry changes or
          unanticipated economic downturns.  The Company's and TEP's
          success will depend, in part, on TEP's ability to contain and/or
          reduce the costs of serving retail customers and the level of
          sales to such customers.  In a deregulated environment, revenues
          from sales of energy may become less certain.

               The Company's financial prospects are also subject to
          uncertainties relating to the start-up and developmental
          activities of the unregulated energy-related affiliates. 
          Although the Company's investments in unregulated energy-related
          affiliates comprise less than 1% of total assets, start-up costs
          and other subsidiary developmental activities have contributed to
          losses from these activities in 1998.  These losses have
          contributed to the losses reported by the Company for the six-
          months ended June 30, 1998.

               Depending on the nature of future investment opportunities,
          the Company expects to make additional investments in these
          subsidiaries and in other energy-related ventures.  The Arizona
          Corporation Commission (the "ACC") Holding Company Order requires
          that the capitalization (debt and equity) of the Company's
          affiliates other than TEP not exceed 30% of TEP's capitalization
          unless otherwise approved by the ACC.

   
          RETAIL COMPETITION

               In December 1996, the ACC adopted rules that require a
          phase-in of retail electric competition in Arizona beginning
          January 1, 1999.  The rules were adopted as a framework to
          implement competition.  On August 5, 1998 the ACC adopted
          amendments to the rules which, in part, provide a two-year phase-
          in schedule in which all retail customers will have access to
          competitive generation by January 1, 2001.  Among other things,
          the rules state that "all competitive generation assets and
          services shall be separated from an Affected Utility prior to
          January 1, 2001.  Such separation shall either be to an
          unaffiliated party or to a separate corporate affiliate or
          affiliates.  If an Affected Utility chooses to transfer its
          competitive generation assets or competitive services to a
          competitive electric affiliate, such transfer shall be at a value
          determined by the ACC to be fair and reasonable."  It is
          difficult to predict the outcome of this process and the ultimate
          impact of increased retail competition on TEP's and the Company's
          future sales, revenues or profitability.  See Item 2. -- 
          Management's Discussion and Analysis of Financial Condition and
          Results of Operations -- "Competition, Retail" and "Accounting
          for the Effects of Regulation" in the Second Quarter 10-Q.

    
   
               As discussed in the Second Quarter 10-Q, the ACC has issued
          an order concerning stranded cost quantification and recovery. 
          The order provides TEP with two methods for quantifying and
          recovering stranded costs:  (1) Divestiture/Auction Methodology
          and (2) Transition Revenues Methodology.  The order encourages,
          but does not require, full divestiture of generating assets
          through an auction to unaffiliated third parties.  The order
          states that only those Affected Utilities choosing divestiture
          through the Divestiture/Auction Methodology shall have the
          opportunity to recover 100% of unmitigated stranded costs.  TEP
          must file its choice of options and preliminary plan with the ACC
          by August 21, 1998.  The amount of stranded costs and method of
          recovery that the ACC approves for TEP will determine whether
          write-offs will be incurred at that time.  The ACC is not
          expected to make a final determination of a stranded cost

                                       8

<PAGE>


          recovery plan for TEP until at least the fourth quarter of 1998. 
          The Company and TEP are unable to predict the amount of write-
          offs, if any, that may be incurred at that time.
    

          DEBT LEVERAGE
   

               The Company's and TEP's  capital structure is highly
          leveraged.  Although TEP was able to refinance and extend the
          maturities of certain debt obligations at favorable rates and
          terms in 1997 and 1998, there can be no assurance that continued
          access to the capital markets at such rates and terms will be
          available.  Despite a reduction in variable rate debt obligations
          in 1997 and 1998, the Company's and TEP's earnings and cash flow
          would still be affected by changes in interest rate levels on the
          remaining variable rate debt.  As of June 30, 1998, TEP had $329
          million aggregate principal amount of variable rate debt
          obligations.  See Item 8. -- Consolidated Financial Statements
          and Supplementary Data in the 1997 10-K, and Item 2. -
          Management's Discussion and Analysis of Financial Condition and
          Results of Operations -- "Overview" in the Second Quarter 10-Q.
    

          TAX EXEMPT LOCAL FURNISHING BONDS

               A substantial portion of TEP's utility plant assets qualify
          as "facilities for the local furnishing of electric energy"
          within the meaning of the Internal Revenue Code, and have been
          financed with the proceeds from the issuance of industrial
          development revenue bonds (approximately $580 million at the date
          of this Prospectus).  The interest on these bonds is, generally,
          excluded from gross income for federal income tax purposes. 
          Should TEP's local furnishing system become disqualified, in
          whole or in part, due to asset divestitures or unanticipated
          changes in tax laws, industry structure or system operations, it
          likely would be necessary for some or all of these bonds to be
          redeemed or defeased.  See Item 7. -- Management's Discussion and
          Analysis of Financial Condition and Results of Operations --
          "Liquidity and Capital Resources, Tax Exempt Local Furnishing
          Bonds," in the 1997 10-K.

   
          LOSSES FROM ENERGY-RELATED AFFILIATES

               The Company's investments in MEH and its subsidiaries
          (included in Investments and Other Property in the Company's
          consolidated balance sheet) comprise less than 1% of total
          assets.  However, the net loss related to these start-up
          operations totaled $5.6 million for the second quarter and $9.7
          million for the first six months of 1998.  This loss is included
          in the Other Income (Deductions) section on the Company's income
          statement.  Almost all of MEH's losses in both the second quarter
          and first six months of 1998 occurred at New Energy Ventures,
          L.L.C. ("NEV"), a buyer's agent providing electric load
          aggregation and advisory services to retail purchasers of
          electric energy.  The California electricity market was
          originally scheduled to open to competitors such as NEV on
          January 1, 1998.  However, technical matters related to the
          California Independent System Operator and the California Power
          Exchange delayed the opening of the electricity market until
          March 31, 1998.  Therefore, NEV could not make retail power sales
          in California in the first quarter.  Start-up costs associated
          with expansion into additional regions of the country also
          contributed to the losses in the first half of 1998.  NEV may
          continue to experience losses in future periods.  In addition,
          the Company's other energy-related ventures are in the
          developmental and start-up stages, have limited operating
          histories and, to date, have had limited profitability. 
          Consequently, there can be no assurance that the Company will not
          experience additional losses from the activities of its energy-
          related affiliates in future periods.  See Item 2. --
          Management's Discussion and Analysis of Financial Condition and
          Results of Operations -- "Investments in Energy Related
          Affiliates," in the Second Quarter 10-Q.
    

          DIVIDENDS ON COMMON STOCK

               UNISOURCE ENERGY

               The Company's ability to pay dividends is dependent upon
          cash flow from its subsidiaries, TEP and MEH.  TEP comprises
          substantially all of the Company's assets.  As described below,
          although TEP is currently unable to declare or pay dividends, it
          has called for redemption in the third quarter of 1998 those
          First Mortgage Bonds which have covenants restricting the payment
          of dividends.  No dividend on common stock has been declared or
          paid by TEP since 1989.  Until such time as TEP is able to pay
          dividends to the Company, it is unlikely that the Company would
          declare and pay dividends to holders of Common Stock.  


                                       9

<PAGE>

               TEP

               Five outstanding issues of  First Mortgage Bonds
          (aggregating $137 million in principal amount) prevent TEP from
          paying dividends until specific cash flow coverage and retained
          earnings tests are met.  As of June 30, 1998, TEP met the cash
          flow coverage test, but did not meet the retained earnings test,
          which requires positive retained earnings.  These covenants will
          apply until these First Mortgage Bonds have been paid or redeemed
          or the applicable mortgage indentures have been amended.  The
          latest maturity of these First Mortgage Bonds is in 2003.  To
          amend these bonds would require approval by 75% of all First
          Mortgage Bond holders.  During the  third quarter of 1998, TEP
          issued bonds to refinance all of the First Mortgage Bonds that
          prohibit the payment of dividends and has called such First
          Mortgage Bonds for redemption.

               TEP's Credit Agreement allows TEP to pay dividends if it
          maintains compliance with the agreement and meets certain
          financial covenants, including a covenant that requires TEP to
          maintain a minimum level of net worth.  As of June 30, 1998, the
          required minimum net worth was $169 million.  As of June 30,
          1998, TEP is in compliance with the terms of the Credit
          Agreement.

               Pursuant to the Arizona Corporation Commission Holding
          Company Order, until such time as TEP's equity ratio equals 37.5%
          of total capital (excluding capital lease obligations), TEP may
          not pay dividends to the Company in excess of 75% of TEP's
          earnings.  As of June 30, 1998, TEP's equity ratio, as so
          calculated, was 15.6%.

               In addition to these restrictive covenants, the Federal
          Power Act states that dividends shall not be paid out of funds
          properly included in the capital account.  Although the terms of
          the Federal Power Act are unclear, TEP believes that there is a
          reasonable basis to pay dividends from current year earnings.

               See the Incorporated Documents for more information on
          Common Stock dividends.

          ABSENCE OF A PUBLIC TRADING MARKET FOR THE UNS WARRANTS

               There can be no assurance that any significant trading
          market in the UNS Warrants will develop or, if such a market
          develops, that it will have any liquidity.  The Company does not
          currently intend to apply for listing of the UNS Warrants on any
          securities exchange.  Consequently, no assurance can be given
          that a holder will be able to sell any UNS Warrants in the future
          or as to the price at which any such sale may occur.


                                     THE COMPANY

               The Company was incorporated under the laws of the State of
          Arizona on March 8, 1995.  The Company is a holding company which
          owns all of the outstanding common stock of TEP and MEH.  On
          January 1, 1998,  TEP and the Company completed a statutory share
          exchange, pursuant to which the outstanding common stock of TEP
          was exchanged, on a share-for-share basis, for shares of Company
          common stock, no par value.  Following the share exchange, TEP
          transferred the stock of its subsidiary, MEH, to the Company in
          exchange for a promissory note in the approximate amount of $95
          million.  The Company's stock is traded on the New York and
          Pacific Stock Exchanges under the ticker symbol UNS.

               TEP is the principal subsidiary of the Company and accounts
          for substantially all of its assets, revenues and net income. 
          TEP is an operating public utility engaged in delivering energy
          services to retail customers primarily in the Tucson, Arizona
          metropolitan area and to wholesale customers throughout the
          Western United States.  As a public utility, TEP falls under the
          jurisdiction of the Arizona Corporation Commission which has the
          authority to approve rates and certain other corporate actions.  

               TEP provides electric power to approximately 317,000 retail
          customers.  In 1997, TEP generated and sold more than 7,400
          gigawatt hours of energy to retail customers and 3,400 gigawatt
          hours to other customers at wholesale.  Operating revenues from
          such sales exceeded $729 million.  TEP owns or leases 1,896 MW of
          generating capacity located in Arizona and New Mexico.  TEP also
          has transmission and distribution assets to transmit electricity
          from TEP's remote generating facilities to the Tucson area for
          use by TEP's retail customers and to provide interconnections to
          neighboring utilities.

                                       10

<PAGE>


   
              MEH owns all of the outstanding common stock of (i) Nations
          Energy Corporation, which is active in the development of
          independent power projects worldwide, (ii) Millennium Energy
          Holdings, Inc., which holds a 50% interest in NEV, a buyer's
          agent providing electric load aggregation and advisory services
          to retail purchasers of electric energy, (iii) Advanced Energy
          Technologies, Inc., which holds a 50% interest in Global Solar
          Energy, L.L.C., a manufacturer of thin-film photovoltaic cells,
          and (iv) Southwest Energy Solutions, Inc. ("SES"), a provider of
          ancillary energy services to electric consumers.  SES owns all of
          the outstanding common stock of SWPP Investment Company and SWPP
          International, Ltd., which hold ownership interests in businesses
          engaged in the manufacture and sale of concrete power poles.
    

               In 1997, earnings for the Company declined relative to 1996
          primarily due to the lower recognition of non-cash income tax
          benefits in 1997.  Net income was $83.6 million in 1997, compared
          with $120.9 million recorded in 1996 and $54.9 million recorded
          in 1995.  Income tax benefits related to prior period net
          operating losses totaled $43.4 million in 1997, $88.6 million in
          1996 and $23.3 million in 1995, accounting for the majority of
          the fluctuation in reported net income for the last three years.
          See Item 7. - Management's Discussion and Analysis of Financial
          Condition and Results of Operations - "Income Tax Position," in
          the 1997 10-K.  The Company's common stock equity was $216.9
          million at year-end, compared to $133.3 million as of December
          31, 1996, benefiting from a fourth consecutive year of
          profitability.

   
               In addition to the reduction in income tax benefits
          described above, items having a one-time effect on earnings
          resulted in net reductions to earnings of $2.4 million in 1997
          and $6.1 million in 1996.  Excluding each of these one-time items
          from the periods in which they were recorded, ongoing net income
          increased by 11% to $42.6 million in 1997 from $38.3 million in
          1996.  See Item 7. - Management's Discussion and Analysis of
          Financial Condition and Results of Operations - "Overview" and
          Item 8. - Consolidated Financial Statements and Supplementary
          Data - Notes 4, 7 and 9 of Notes to Consolidated Financial
          Statements in the 1997 10-K for information pertaining to certain
          of these items.
    

               The Company's net cash flows from operating activities were
          $124.4 million in 1997, $151.3 million in 1996 and $119.4 million
          in 1995.  After capital expenditures, scheduled debt maturities
          and payments to retire capital lease obligations, net cash flows
          available for other investing and financing activities were $38.1
          million in 1997, $36.9 million in 1996, and $25.9 million in
          1995.
   
               The Company recorded net income of $1.1 million for the
          second quarter and a net loss of $6.0 million for the first six
          months of 1998.  This compares with net income of $29.9 million
          in the second quarter and $41.4 million for the first six months
          of 1997.  The results in the second quarter of 1997 included the
          effect of non-recurring tax benefits and a reversal of a loss
          provision relating to the dissolution of one of TEP's former
          investment subsidiaries, which were partially offset by non-
          recurring expenses.  See Item 2. -- Management's Discussion and
          Analysis of Financial Condition and Results of Operations in the
          Second Quarter 10-Q.
    

               Excluding these one-time adjustments, the Company would have
          recorded net income of $10.4 million in the second quarter of
          1997.  Results in the second quarter of 1998 were affected
          primarily by lower tax benefit recognition, lower non-cash
          regulatory revenues, higher interest expense and lower retail
          sales due to mild weather conditions, as well as start-up costs
          of new unregulated energy-related subsidiaries.

               The results of the first six months of 1997 also included
          the effects of non-recurring tax benefits, reversal of loss
          provision and non-recurring expenses.  Excluding these one-time
          adjustments, the Company would have recorded net income of $10.0
          millon in the first six months of 1997.  Results in the first six
          months of 1998 were effected primarily by losses from unregulated
          energy-related subsidiaries, lower non-cash regulatory revenues,
          and higher interest expense. 

               The unregulated subsidiaries owned by MEH reported a net
          loss of $5.6 million for the second quarter and $9.7 million for
          the first half of 1998, compared with net income of $0.5 million
          in the second quarter and a net loss of $0.4 million for the
          first half of 1997.  The delayed implementation of California's
          competitive electricity market until March 31, 1998, expansion
          into additional regions of the country, and other subsidiary
          development activities affected the financial results for these
          businesses.

               Net cash flows from operating activities increased in
          aggregate by $27.5 million in the first six months of 1998
          compared with the same period in 1997.  This increase was due
          mainly to the payment of $30 million in contract termination fees
          to the coal supplier at the Company's Springerville Generating
          Station in the first half of 1997 compared to only $10.0 million

                                       11

<PAGE>

          paid in the first half of 1998 and the receipt of $11.3 million
          in June 1998 from the sale of emission allowances.  During the
          remainder of 1998 TEP expects to be able to fund operating
          activities and construction expenditures with internal cash
          flows, existing cash balances, and, if necessary, borrowings
          under a revolving credit facility.

               The principal executive offices of the Company and TEP are
          located at 220 West Sixth Street, Tucson, Arizona 85702, where
          the telephone number is (520) 571-4000.


                                       12

          <PAGE>


                                  THE EXCHANGE OFFER


          PURPOSE AND EFFECT OF THE EXCHANGE OFFER

               The TEP Warrants were issued at an initial exercise price of
          $3.20 per share, pursuant to the TEP Warrant Agreement.  In May
          1996 TEP completed a one-for-five reverse split of its common
          stock.  Pursuant to the terms of the TEP Warrant Agreement, the
          TEP Warrants are currently exercisable and expire December 15,
          2002.  The exercise terms are, giving effect to the reverse stock
          split, five TEP Warrants plus an exercise price of $16.00 for
          each share of TEP common stock.

               On January 1, 1998, TEP and the Company completed the Share
          Exchange, pursuant to which the outstanding common stock of TEP
          was exchanged, on a share-for-share basis, for shares of the
          Company's Common Stock.  The consummation of the Share Exchange
          did not convert the TEP Warrants into warrants to purchase shares
          of Company Common Stock.  TEP common stock is no longer listed on
          any stock exchange and there is no established market for trading
          shares of TEP common stock.

               In order to provide TEP Warrant Holders with the opportunity
          to obtain warrants exercisable into UNS Common Stock, which is
          listed and has an established market, the Company is offering to
          exchange UNS Warrants for TEP Warrants pursuant to the terms
          presented herein.  For each TEP Warrant surrendered to and
          accepted by the Company pursuant to the Exchange Offer, the
          Holder of such TEP Warrant will receive 0.20 1999 UNS Warrant and
                  2000 UNS Warrant.  One 1999 UNS Warrant will entitle the
          -------
          Holder to purchase one share of Company Common Stock at a
          purchase price of $16.00 through and including March 15, 1999 and
          one 2000 UNS Warrant will entitle the Holder to purchase one
          share of Company Common Stock at a purchase price of $16.00
          through and including December 15, 2000.


          TERMS OF THE EXCHANGE OFFER

               As of the date of this Prospectus, there were outstanding
          12,054,279 aggregate number of TEP Warrants.  This Prospectus,
          together with the Letter of Transmittal, is being sent to all
          registered Holders of the TEP Warrants.

               The Company has fixed the close of business on        , 1998
                                                              -------
          as the record date for the Exchange Offer for purposes of
          determining the persons to whom this Prospectus and the Letter of
          Transmittal will be mailed initially.  Only a Holder of TEP
          Warrants may tender such TEP Warrants in the Exchange Offer.  The
          term "Holder" with respect to the Exchange Offer means (i) any
          person in whose name TEP Warrants are registered on the Company's
          books, or (ii) any other person who has obtained a properly
          completed assignment from a Holder.

               Upon satisfaction or waiver of all the conditions set forth
          in this Prospectus and in the Letter of Transmittal, the Company
          will accept any and all TEP Warrants validly tendered to the
          Exchange Agent and not withdrawn prior to 5:00 p.m., New York
          City time, on the Expiration Date.  The Company will issue 1999
          UNS Warrants and 2000 UNS Warrants on or promptly after the
          Expiration Date in numbers equal to 0.20 1999 UNS Warrant and
                   2000 UNS Warrant in exchange for each TEP Warrant
          --------
          surrendered pursuant to the Exchange Offer.  

               In all cases, issuance of UNS Warrants for TEP Warrants that
          are accepted for exchange pursuant to the Exchange Offer will be
          made only after timely receipt by the Exchange Agent of a
          properly completed and duly executed Letter of Transmittal and
          all other required documents; provided, however, that the Company
          reserves the absolute right to waive any defects or
          irregularities in the tender or conditions of the Exchange Offer. 
          If any tendered TEP Warrants are not accepted for any reason set
          forth in the terms and conditions of the Exchange Offer, or if
          TEP Warrants are submitted for a greater number than the Holder
          desires to exchange, then such unaccepted or non-exchanged TEP
          Warrants evidencing the unaccepted portion, as appropriate, will
          be returned without expense to the tendering registered Holder
          thereof as promptly as practicable after the expiration or
          termination of the Exchange Offer.  For purposes of the Exchange
          Offer, the Company shall be deemed to have accepted properly
          tendered TEP Warrants for exchange if, as and when the Company
          shall have given oral or written notice thereof to the Exchange
          Agent.  The Exchange Agent will act as agent for the tendering
          Holders for the purposes of receiving the UNS Warrants from the
          Company.

               Holders who tender TEP Warrants in the Exchange Offer will
          not be required to pay brokerage commissions or fees or, subject

                                       13

<PAGE>

          to the instructions in the Letter of Transmittal, transfer taxes
          with respect to the exchange pursuant to the Exchange Offer.  The
          Company will pay all charges and expenses, other than certain
          applicable taxes described below, in connection with the Exchange
          Offer.  See "Fees and Expenses."

   
               The Company intends to conduct the Exchange Offer in
          accordance with the applicable requirements of the Exchange Act
          and the rules and regulations of the SEC thereunder. Any and all
          TEP Warrants acquired by the Company will be delivered to TEP for
          cancellation.  TEP Warrants that are not tendered for exchange in
          the Exchange Offer will remain outstanding and will be entitled to
          such rights and benefits such Holders have under the TEP Warrant
          Agreement. Holders of TEP Warrants do not have any appraisal or
          dissenters' rights under Arizona law or the TEP Warrant Agreement
          in connection with the Exchange Offer.  No TEP Warrants are to be
          acquired from any officer, director or affiliate of TEP.
    

          NO FRACTIONAL WARRANTS

               No certificate representing fractional UNS Warrants will be
          issued in connection with the Exchange Offer.  Fractional UNS
          Warrants that otherwise would be issued in exchange for TEP
          Warrants pursuant to the Exchange Offer will be rounded up to the
          nearest whole UNS Warrant.

          EXPIRATION DATE

               The term "Expiration Date," shall mean 5:00 p.m., New York
          City time, on September   , 1998, unless the Company, in its sole
                                 ---
          discretion, extends the Exchange Offer, in which case the term
          "Expiration Date" shall mean the latest date and time to which
          the Exchange Offer is extended. In order to extend the Exchange
          Offer the Company will notify the Exchange Agent of any extension
          by oral or written notice and will mail to the registered Holders
          an announcement thereof prior to 9:00 a.m., New York City time,
          on the next business day after the then Expiration Date.

          RIGHT TO TERMINATE OR AMEND

               Notwithstanding any other term of the Exchange Offer, the
          Company expressly reserves the right at any time prior to the
          Expiration Date, in its sole discretion, (i) to delay accepting
          any TEP Warrants and to extend the Exchange Offer, (ii) terminate
          the Exchange Offer, or (iii) to amend the terms of the Exchange
          Offer in any manner.  Any such delay in acceptances, extension,
          termination or amendment will be followed as promptly as
          practicable by oral or written notice thereof to the registered
          Holders.

               If the Company determines in its sole discretion to extend,
          terminate or amend the Exchange Offer, the Company may (i) refuse
          to accept any TEP Warrants and return all tendered TEP Warrants
          to the tendering Holders, (ii) extend the Exchange Offer and
          retain all TEP Warrants tendered prior to the expiration of the
          Exchange Offer, subject, however, to the rights of Holders who
          tendered such TEP Warrants to withdraw their tendered TEP
          Warrants, or (iii) waive any unsatisfied conditions of tender and
          accept all properly tendered TEP Warrants which have not been
          withdrawn.  If any such amendment or waiver constitutes a
          material change to the Exchange Offer, the Company will promptly
          disclose such amendment or waiver by means of a prospectus
          supplement that will be distributed to the Holders, and the
          Company will extend the Exchange Offer for a period of five to
          ten business days, depending upon the significance of the
          amendment or waiver and the manner of disclosure to the Holders,
          if the Exchange Offer would otherwise expire during such five to
          ten business day period.

          PROCEDURES FOR TENDERING

               To tender TEP Warrants in the Exchange Offer, a Holder must
          complete, sign and date the Letter of Transmittal, or facsimile
          thereof, have the signatures thereon guaranteed if required by
          the Letter of Transmittal, and mail or otherwise deliver such
          Letter of Transmittal or such facsimile along with the
          certificates for such TEP Warrants to the Exchange Agent prior to
          the Expiration Date.  To be tendered effectively, the Letter of
          Transmittal and other required documents must be received by the
          Exchange Agent at the address set forth below under "Exchange
          Agent" prior to the Expiration Date.

               A tender by a Holder which is not withdrawn prior to the
          Expiration Date will constitute an agreement between such Holder
          and the Company in accordance with the terms and subject to the
          conditions set forth herein and in the Letter of Transmittal.  

                                       14

<PAGE>

               THE METHOD OF DELIVERY OF TEP WARRANTS AND THE LETTER OF
          TRANSMITTAL AND ALL OTHER REQUIRED DOCUMENTS TO THE EXCHANGE
          AGENT IS AT THE ELECTION AND RISK OF THE HOLDER.  INSTEAD OF
          DELIVERY BY MAIL, IT IS RECOMMENDED THAT HOLDERS USE AN OVERNIGHT
          OR HAND DELIVERY SERVICE AND THE DELIVERY WILL BE DEEMED MADE
          ONLY WHEN ACTUALLY RECEIVED OR CONFIRMED BY THE EXCHANGE AGENT. 
          IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ASSURE
          DELIVERY TO THE EXCHANGE AGENT BEFORE THE EXPIRATION DATE.  NO
          LETTER OF TRANSMITTAL OR TEP WARRANTS SHOULD BE SENT TO THE
          COMPANY.  HOLDERS MAY REQUEST THEIR RESPECTIVE BROKERS, DEALERS,
          COMMERCIAL BANKS, TRUST COMPANIES OR NOMINEES TO EFFECT THE ABOVE
          TRANSACTIONS FOR SUCH HOLDERS.

               Any beneficial owner whose interests in the TEP Warrants are
          registered in the name of a broker, dealer, commercial bank,
          trust company, nominee or other securities intermediary and who
          wishes to tender such TEP Warrants in the Exchange Offer should
          contact such securities intermediary promptly and instruct such
          securities intermediary to tender on such beneficial owner's
          behalf.  If any such beneficial owner wishes to tender on such
          owner's own behalf, such owner must, prior to completing and
          executing the Letter of Transmittal and delivering such owner's
          TEP Warrants, either make appropriate arrangements to register
          ownership of the TEP Warrants in such owner's name or obtain a
          properly completed assignment from the registered Holders of the
          TEP Warrants.  The transfer of ownership may take considerable
          time and might not be completed prior to the Expiration Date.

               Signatures on a Letter of Transmittal or a notice of
          withdrawal, as the case may be, must be guaranteed by an Eligible
          Institution (as defined below) unless the TEP Warrants tendered
          pursuant thereto are tendered (i) by a Holder who has not
          completed the box entitled "Special Issuance Instructions" or
          "Special Delivery Instructions" on the Letter of Transmittal or
          (ii) for the account of an Eligible Institution (as defined
          below).  In the event that signatures on a Letter of Transmittal
          or a notice of withdrawal, as the case may be, are required to be
          guaranteed, such guarantor must be a member firm of a registered
          national securities exchange or of the National Association of
          Securities Dealers, Inc., a commercial bank or trust company
          having an office or correspondent in the United States or an
          "eligible guarantor institution" within the meaning of Rule 17Ad-
          15 under the Exchange Act (an "Eligible Institution").

               If the Letter of Transmittal is signed by a person other
          than the registered Holder(s), such TEP Warrants must be endorsed
          or accompanied by a properly completed assignment signed by such
          Holder as such Holder's name appears on such TEP Warrants.

               If the Letter of Transmittal or any TEP Warrants or
          assignments are signed by trustees, executors, administrators,
          guardians, attorneys-in-fact, officers of corporations or others
          acting in a fiduciary or representative capacity, such persons
          should so indicate when signing and, unless waived by the
          Company, evidence satisfactory to the Company of their authority
          to so act must be submitted with the Letter of Transmittal.

               All questions as to the validity, form, eligibility
          (including time of receipt), acceptance of tendered TEP Warrants
          and withdrawal of tendered TEP Warrants will be determined by the
          Company in its sole discretion, which determination will be final
          and binding.  The Company reserves the absolute right to reject
          any and all TEP Warrants not properly tendered or any TEP
          Warrants the Company's acceptance of which would, in the opinion
          of counsel for the Company, be unlawful.  The Company also
          reserves the right to waive any defects, irregularities or
          conditions of tender as to particular TEP Warrants.  The
          Company's interpretation of the terms and conditions of the
          Exchange Offer (including the instructions in the Letter of
          Transmittal) will be final and binding on all parties.  Unless
          waived, any defects or irregularities in connection with tenders
          of TEP Warrants must be cured within such time as the Company
          shall determine.  Although the Company intends to notify
          registered Holders of defects or irregularities with respect to
          tenders of TEP Warrants, none of the Company, the Exchange Agent
          or any other person shall be under any duty to give notification
          of defects or irregularities with respect to tenders of TEP
          Warrants, nor shall any of them incur any liability for failure
          to give such notification.  Tenders of TEP Warrants will not be
          deemed to have been made until such defects or irregularities
          have been cured or waived.  Any TEP Warrants received by the
          Exchange Agent that are not properly tendered and as to which the
          defects or irregularities have not been cured or waived will be
          returned by the Exchange Agent to the tendering registered
          Holders, unless otherwise provided in the Letter of Transmittal,
          as soon as practicable following the Expiration Date.

                                       15
<PAGE>


          WITHDRAWAL OF TENDERS

               Except as otherwise provided herein, tenders of TEP Warrants
          may be withdrawn at any time prior to 5:00 p.m., New York City
          time, on the Expiration Date.  

               To withdraw a tender of TEP Warrants in the Exchange Offer,
          a Holder must send to the Exchange Agent a telegram, facsimile
          transmission or letter at its address set forth herein, prior to
          5:00 p.m., New York City time, on the Expiration Date.  Any such
          withdrawal notice must (i) specify the name of such Holder,
          (ii) identify the number of TEP Warrants delivered for exchange,
          (iii) contain a statement that such Holder is withdrawing such
          TEP Warrants for exchange and (iv) specifying the TEP Warrants to
          be withdrawn (including the certificate number).  Any such notice
          of withdrawal must be signed by the Holder in the same manner as
          the original signature on the Letter of Transmittal by which such
          TEP Warrants were tendered (including any required signature
          guarantees).

               All questions as to the validity, form and eligibility
          (including time of receipt) of such notices will be determined by
          the Company in its sole discretion, which determination shall be
          final and binding on all parties.  Any TEP Warrants so withdrawn
          will be deemed not to have been validly tendered for purposes of
          the Exchange Offer and no UNS Warrants will be issued with
          respect thereto unless the TEP Warrants so withdrawn are validly
          re-tendered.  Any TEP Warrants which have been tendered but which
          are not accepted for exchange will be returned to the registered
          Holder thereof without cost to such Holder as soon as practicable
          after withdrawal.  Properly withdrawn TEP Warrants may be re-
          tendered by following one of the procedures described above under
          "Procedures for Tendering" at any time prior to the Expiration
          Date.

          EXCHANGE AGENT

               The Bank of New York has been appointed as Exchange Agent of
          the Exchange Offer.  Questions and requests for assistance,
          requests for additional copies of this Prospectus or of the
          Letter of Transmittal should be directed to the Exchange Agent,
          addressed as follows:

          By Registered Mail or             By Overnight Courier:
          Certified Mail:

          The Bank of New York              Tender and Exchange Department
          Tender and Exchange Department    The Bank of New York
          P.O. Box 11248                    101 Barclay Street
          Church Street Station             Receive and Deliver Window
          New York, New York 10286-1248     New York, New York 10286


          By Telephone:                     By Facsimile:

          (212) 815-2499                    (212) 815-6213

               Originals of all documents submitted by facsimile should be
          sent promptly by registered mail, overnight courier or hand. 
          Delivery to an address other than as set forth above will not
          constitute a valid delivery.

          FEES AND EXPENSES

               The expenses of soliciting tenders will be paid by the
          Company.  The principal solicitation is being made by mail;
          however, additional solicitation may be made by telecopier,
          telephone or in person by officers and regular employees of the
          Company and its affiliates.

   
              The Company has not retained any dealer-manager in
          connection with the Exchange Offer and will not make any payments
          to brokers-dealers or others soliciting acceptances of the
          Exchange Offer.  Beacon Hill Partners, Inc. has been engaged to
          transmit copies of this Prospectus to beneficial owners of TEP
          Warrants at a cost to the Company of approximately $1,000 plus
          reasonable out-of-pocket expenses.  The Company will pay the
          Exchange Agent reasonable and customary fees for its services and
          will reimburse the Exchange Agent for its reasonable out-of-
          pocket expenses in connection therewith.
    
                                       16

<PAGE>


               The cash expenses to be incurred in connection with the
          Exchange Offer will be paid by the Company.  Such expenses
          include fees and expenses of the Exchange Agent, accounting and
          legal fees and printing costs, among others.

               The Company will pay all transfer taxes, if any, applicable
          to the exchange of the TEP Warrants pursuant to the Exchange
          Offer.  If, however, certificates representing UNS Warrants for
          warrants not tendered or accepted for exchange are to be
          delivered to, or are to be issued in the name of, any person
          other than the Holder of TEP Warrants tendered, or if tendered
          TEP Warrants are registered in the name of any person other than
          the person signing the Letter of Transmittal, or if a transfer
          tax is imposed for any reason other than the exchange of the TEP
          Warrants pursuant to the Exchange Offer, then the amount of any
          such transfer taxes (whether imposed on the registered Holder or
          any other persons) will be payable by the tendering Holder.  If
          satisfactory evidence of payment of such taxes or exemption
          therefrom is not submitted with the Letter of Transmittal, the
          amount of such transfer taxes will be billed directly to such
          tendering Holder.

               The Company will not receive any proceeds from the Exchange
          Offer.  In consideration of issuing the UNS Warrants in the
          Exchange Offer, the Company will receive the TEP Warrants.  TEP
          Warrants that are properly tendered in the Exchange Offer and not
          validly withdrawn will be accepted, and canceled and cannot be
          reissued.


                                   USE OF PROCEEDS

               The Company will not receive any proceeds from the issuance
          of the UNS Warrants or from the Exchange Offer. TEP Warrants that
          are properly tendered in the Exchange Offer and not validly
          withdrawn will be accepted and canceled and cannot be reissued. 
          To the extent that shares of Common Stock are purchased from the
          Company pursuant to the exercise of the UNS Warrants, the Company
          will receive all of the proceeds from such sales and intends to
          use the proceeds for general corporate purposes.


                        DIFFERENCES BETWEEN THE TEP WARRANTS 
                                 AND THE UNS WARRANTS

               The form and terms of the UNS Warrants are substantially the
          same as the form and terms of the TEP Warrants except that one
          1999 UNS Warrant will entitle the Holder to purchase one share of
          Company Common Stock at a purchase price of $16.00 through and
          including March 15, 1999 and one 2000 UNS Warrant will entitle
          the Holder to purchase one share of Company Common Stock at a
          purchase price of $16.00 through and including December 15, 2000. 

               The TEP Warrants were originally issued at an exercise price
          of $3.20 per share, expiring in 2002, pursuant to the terms of
          the TEP Warrant Agreement.  The one share of TEP Common Stock
          currently issuable upon exercise of five TEP Warrants and the
          current exercise price of $16.00 per share give effect to the
          one-for-five reverse stock split completed by TEP in May 1996.

               The Bank of New York acts as initial Warrant Agent under the
          Warrant Agreement.  There is no warrant agent under the TEP
          Warrant Agreement.

               The statements contained herein concerning the TEP Warrants,
          the UNS Warrants, the TEP Warrant Agreement and the Warrant
          Agreement do not purport to be complete and are qualified in
          their entirety by reference to the TEP Warrant Agreement and the
          Warrant Agreement.


                           DESCRIPTION OF THE UNS WARRANTS

          GENERAL

               The 1999 UNS Warrants and 2000 UNS Warrants will be issued
          in substantially the form annexed hereto as Exhibits A and B to
          Appendix A, respectively.  The UNS Warrants will be issued under

                                       17

<PAGE>

          and be entitled to all the rights and benefits of, and subject to
          the limitations under, the Warrant Agreement.

          TERMS OF THE UNS WARRANTS

               Exercise and Expiration.  Subject to adjustments in certain
          circumstances, each 1999 UNS Warrant gives the registered holder
          of such Warrant (the "Registered Warrant Holder") the right to
          purchase one share of Company Common Stock at an initial price of
          $16.00 per share (the "Exercise Price") at any time prior to 5:00
          p.m. on March 15, 1999 and each 2000 UNS Warrant gives such
          Registered Warrant Holder the right to purchase one share of
          Company Common Stock at the Exercise Price at any time prior to
          5:00 p.m. on December 15, 2000.

               Registration and Transfer of the Warrants.  UNS Warrant
          certificates may be exchanged for other UNS Warrant certificates
          representing an equal aggregate number of UNS Warrants of like
          tenor and the transfer of UNS Warrant certificates may be
          registered, in whole or in part, at the offices of the Warrant
          Agent.

               Redemption.  The UNS Warrants are not subject to mandatory
          redemption by the Company, except that the Registered Warrant
          Holders have the option to require the Company to redeem the UNS
          Warrants in the case of a merger, consolidation or sale, transfer
          or lease of all or substantially all the assets of the Company,
          as described below.

               Method of Exercise.  The UNS Warrants are exercisable by
          surrendering to the Warrant Agent at its principal office a UNS
          Warrant certificate signed by the Registered Warrant Holder or
          his duly authorized agent indicating such Registered Warrant
          Holder's election to exercise all or a portion of the UNS
          Warrants evidenced by that certificate.  Surrendered UNS Warrant
          certificates have to be accompanied by the amount of the
          aggregate Exercise Price.  Payment of such amount has to be made
          in lawful money of the United States in cash or by certified or
          official bank check.  The Company has reserved for issuance a
          number of shares of Common Stock sufficient to provide for
          exercise of the rights of purchase represented by the UNS
          Warrants.  When delivered, those shares of Common Stock will be 
          duly and validly authorized and issued, fully paid and
          nonassessable, and will be free and clear of all liens,
          encumbrances, equities and claims, and no preemptive rights or
          rights of first refusal will exist with respect to the shares.

               Adjustment of Exercise Price and Number of Shares of Common
          Stock.  The number and kind of shares purchasable upon the
          exercise of UNS Warrants and the Exercise Price are subject to
          adjustment from time to time as follows:

                    (a)  Changes in Common Stock.  In the event the company
          shall (i) issue any shares of Common Stock as a stock dividend to
          the holders of Common Stock, (ii) subdivide or combine the
          outstanding shares Common Stock into a greater or lesser number
          of shares or (iii) issue any shares of its capital stock in a
          reclassification or reorganization of the Common Stock (any such
          issuance, subdivision, combination, reclassification or
          reorganization being herein called a "Change of Shares"), then
          (A) in the case of (i) or (ii) above the number of shares of
          Common Stock that may be purchased upon the exercise of each UNS
          Warrant shall be adjusted to the number of shares of Common Stock
          of the Company that the Registered Warrant Holder would have
          owned or have been entitled to receive after the happening of
          such event had such UNS Warrant been exercised immediately prior
          to the record date (or, if there is no record date, the effective
          date) for such event, and the Exercise Price shall be adjusted to
          the price (calculated to the nearest 1,000th of one cent)
          determined by multiplying the Exercise Price immediately prior to
          such event by a fraction the numerator of which shall be the
          number of shares of Common Stock purchasable with one UNS Warrant
          immediately prior to such event and the denominator of which
          shall be the number of shares of Common Stock purchasable with
          one UNS Warrant after the adjustment referred to above and (B) in
          the case of (iii) above, paragraph (h) below shall apply.

                    (b)  Common Stock Distribution.  In the event the
          Company shall issue, sell or otherwise distribute any shares of
          Common Stock (other than (x) pursuant to Change of Shares or (y)
          upon the exercise of any Option, Convertible Security (each as
          defined in paragraph (c) below) or UNS Warrant) (any such event,
          including any event described in paragraphs (c) and (d) below,
          being herein called a "Common Stock Distribution"), for a
          consideration per share less than the current market price per
          share of Common Stock (as defined in paragraph (f) below) on the
          date of such Common Stock Distribution, then, effective upon such
          Common Stock Distribution, the Exercise Price shall be reduced to
          the price determined by multiplying the Exercise Price in effect
          immediately prior to such Common Stock Distribution by a
          fraction, the numerator of which shall be the sum of (i) the
          number of shares of Common Stock outstanding (exclusive of any
          treasury shares) immediately prior to such Common Stock
          Distribution multiplied by the current market price per share of
          Common Stock on the date of such Common Stock Distribution, plus
          (ii) the consideration, if any, received by the Company upon such
          Common Stock Distribution, and the denominator of which shall be

                                       18

<PAGE>


          the product of (A) the total number of shares of Common Stock
          outstanding (exclusive of any treasury shares) immediately after
          such Common Stock Distribution multiplied by (B) the current
          market price per share of Common Stock on the date of such Common
          Stock Distribution.

                    If any Common Stock Distribution shall require an
          adjustment to the Exercise Price, then, effective at the time
          such adjustment is made, the number of shares of Common Stock
          purchasable upon the exercise of each UNS Warrant shall be
          increased to a number determined by multiplying the number of
          such shares so purchasable immediately prior to such Common Stock
          Distribution by a fraction, the numerator of which shall be the
          Exercise Price in effect immediately prior to such adjustment and
          the denominator of which shall be the Exercise Price in effect
          immediately after such adjustment.

                    The provisions described in this paragraph (b),
          including by operation of the provisions described in paragraph
          (c) or (d) below, shall not operate to increase the Exercise
          Price or reduce the number of shares of Common Stock purchasable
          upon the exercise of any UNS Warrant.

                    (c)  Issuance of Options.  In the event the Company
          shall issue, sell, distribute or otherwise grant in any manner
          (including by assumption) any rights to subscribe for or to
          purchase, or any warrants or options for the purchase of, Common
          Stock or any stock or securities convertible into or exchangeable
          for Common Stock (any such rights, warrants or options being
          herein called "Options" and any such convertible or exchangeable
          stock or securities being herein called "Convertible
          Securities"), and the price per share at which Common Stock is
          issuable upon the exercise of such Options or upon the conversion
          or exchange of such Convertible Securities shall be less than the
          current market price per share of Common Stock on the date of the
          issuance, sale, distribution or granting of such Options then,
          for purposes of the provisions described in paragraph (b) above,
          the total maximum number of shares of Common Stock issuable upon
          the exercise of all such Options or upon the conversion or
          exchange of the total maximum amount of the Convertible
          Securities issuable upon the exercise of all such Options shall
          be deemed to have been issued as of the date of the issuance,
          sale, distribution or granting of such Options and thereafter
          shall be deemed to be outstanding and the Company shall be deemed
          to have received as consideration the price per share therefor. 
          Except in certain limited circumstances, no additional adjustment
          of the Exercise Price shall be made upon the actual exercise of
          such Options or conversion or exchange of the Convertible
          Securities issuable upon the exercise of such Options.

                    (d)  Issuance of Convertible Securities.  In the event
          the Company shall issue, sell or otherwise distribute (including
          by assumption) any Convertible Securities (other than upon the
          exercise of any Option), and the price per share at which Common
          Stock is issuable upon the conversion or exchange of such
          Convertible Securities shall be less than the current market
          price per share of Common Stock on the date of such issuance,
          sale or distribution, then, for purposes of the provisions
          described in paragraph (b) above, the total maximum number of
          shares of Common Stock issuable upon the conversion or exchange
          of all such Convertible Securities shall be deemed to have been
          issued as of the date of the issuance, sale or distribution of
          such Convertible Securities and thereafter shall be deemed to be
          outstanding and the Company shall be deemed to have received as
          consideration the price per share therefor.  Except in certain
          limited circumstances, no additional adjustment of the Exercise
          Price shall be made upon the actual conversion or exchange of
          such Convertible Securities.

                    (e)  Dividends and Distributions.  In the event the
          Company shall distribute to the holders of Common Stock any
          dividend or other distribution of cash, evidences of its
          indebtedness, other securities or other properties or assets (in
          each case other than (i) dividends payable in Common Stock,
          Options or Convertible Securities and (ii) any cash dividend
          that, when added to all other cash dividends paid in the one year
          prior to the declaration date of such dividend (excluding any
          such other dividend included in a previous adjustment of the
          Exercise Price pursuant to the provisions described in this
          paragraph (e)), does not exceed 10% of the current market price
          per share of Common Stock on such declaration date), or any
          options, warrants or other rights to subscribe for or purchase
          any of the foregoing, then (A) the Exercise Price shall be
          decreased to a price determined by multiplying the Exercise Price
          then in effect by a fraction, the numerator of which shall be the
          current market price per share of Common Stock on the record date
          for such distribution less the sum of (X) the cash portion, if
          any, of such distribution per share of Common Stock outstanding
          (exclusive of any treasury shares) on the record date for such
          distribution plus (Y) the then fair market value (as determined
          in good faith by the Board of Directors of the Company) per share
          of Common Stock outstanding (exclusive of any treasury shares) on
          the record date for such distribution of that portion, if any, of
          such distribution consisting of evidences of indebtedness, other
          securities, properties, assets, options, warrants or subscription
          or purchase rights, and the denominator of which shall be such
          current market price per share of Common Stock and (B) the number
          of shares of Common Stock purchasable upon the exercise of each

                                       19

<PAGE>

          UNS Warrant shall be increased to a number determined by
          multiplying the number of shares of Common Stock so purchasable
          immediately prior to the record date for such distribution by a
          fraction, the numerator of which shall be the Exercise Price in
          effect immediately prior to the adjustment required by the
          provisions described in clause (A) of this sentence and the
          denominator of which shall be the Exercise Price in effect
          immediately after such adjustment. 

                    (f)  Current Market Price.  For the purpose of any
          computation described in paragraphs (b), (c), (d) and (e) above,
          the current market price per share of Common Stock at any date
          shall be the average of the daily closing prices for the shorter
          of (i) the 20 consecutive trading days ending on the last full
          trading day on the exchange or market specified in the second
          succeeding sentence prior to the Time of Determination and (ii)
          the period commencing on the date next succeeding the first
          public announcement of the issuance, sale, distribution or
          granting in question through such last full trading day prior to
          the Time of Determination.  The term "Time of Determination"
          shall mean the time and date of the earlier to occur of (A) the
          date as of which the current market price is to be computed and
          (B) the last full trading day on such exchange or market before
          the commencement of "ex-dividend" trading in the Common Stock
          relating to the event giving rise to the adjustment required by
          the provisions described in paragraph (b), (c), (d) or (e).  The
          closing price for any day shall be the last reported sale price
          regular way or, in case no such reported sale takes place on such
          day, the average of the closing bid and asked prices regular way
          for such day, in each case (1) on the principal national
          securities exchange on which the shares of Common Stock are
          listed or to which such shares are admitted to trading or (2) if
          the Common Stock is not listed or admitted to trading on a
          national securities exchange, in the over-the-counter market as
          reported by NASDAQ or any comparable system or (3) if the Common
          Stock is not listed on NASDAQ or a comparable system, as
          furnished by two members of the NASD selected from time to time
          in good faith by the Board of Directors of the Company for that
          purpose.  In the absence of all of the foregoing, or if for any
          other reason the current market price per share cannot be
          determined pursuant to the foregoing provisions described in this
          paragraph (f), the current market price per share shall be the
          fair market value thereof as determined in good faith by the
          Board of Directors of the Company.

                    (g)  Deferral of Certain Adjustments.  No adjustment to
          the Exercise Price (including the related adjustment to the
          number of shares of Common Stock purchasable upon the exercise of
          each UNS Warrant) shall be required unless such adjustment,
          together with other adjustments carried forward as provided
          below, would result in an increase or decrease of at least one
          percent of the purchase price; provided, however, that any
          adjustments which by reason of the provisions described in this
          paragraph are not required to be made shall be carried forward
          and taken into account in any subsequent adjustment.  No
          adjustment need be made for a change in the par value of the
          Common Stock.

                    (h)  Other Adjustments.  In the event that at any time,
          as a result of an adjustment made pursuant to the anti-dilution
          provisions of the Warrant Agreement, the Registered Warrant
          Holders shall become entitled to receive any securities of the
          Company other than shares of Common Stock, thereafter the number
          of such other securities so receivable upon exercise of the UNS
          Warrants and the Exercise Price applicable to such exercise shall
          be subject to adjustment from time to time in a manner and on
          terms as nearly equivalent as practicable to the provisions with
          respect to the shares of Common Stock contained in the Warrant
          Agreement.

                    (i)  Excluded Transactions.  Notwithstanding any
          provision in this section to the contrary, no adjustment shall be
          made as described above in respect of (A) the granting of any
          Options or the issuance of any shares of Common Stock that may be
          registered on Form S-8 or any successor form under the Securities
          Act of 1933, as amended, to any officers, directors or employees
          of, or any consultants or advisors to, the Company or any of its
          affiliates, or (ii) the issuance of Common Stock pursuant to any
          dividend reinvestment or direct stock purchase plan which
          provides that the price of the Common Stock purchased for plan
          participants from the Company will be the average of the high and
          low sales prices of the Common Stock on the consolidated tape on
          the investment date or, if no trading in the Common Stock occurs
          on such date, the next preceding date on which trading occurred;
          provided, however, that clause (A) of this paragraph (i) shall
          --------  -------
          not apply to any such grant or issuance, if, after giving effect
          thereto, the aggregate amount of Common Stock issued in all
          transactions covered by clause (A) of this paragraph (i)
          (assuming the exercise of all then outstanding Options granted in
          such transactions) would exceed 5% of the number of shares of
          Common Stock then outstanding (after giving effect to the
          exercise of all then outstanding Options so granted but before
          giving effect to any other exercise of Options or Convertible
          Securities).

               Preservation of Purchase Rights upon Merger, Consolidation,
          etc.; Mandatory Redemption of UNS Warrants. (a) In case of any
          consolidation or merger of the Company with or into another
          person or in case of any sale, transfer or lease to another

                                       20

<PAGE>

          person of all or substantially all the property of the Company,
          the Company and such successor or purchasing person, as the case
          may be, shall agree in writing (and such consolidation, merger,
          sale, transfer or lease shall not be consummated without such
          agreement) that each Registered Warrant Holder shall have the
          right thereafter upon payment of the Exercise Price in effect
          immediately prior to such action to purchase upon exercise of a
          UNS Warrant the kind and amount of securities, cash and other
          property that it would have owned or have been entitled to
          receive after the happening of such consolidation, merger, sale,
          transfer or lease had such UNS Warrant been exercised immediately
          prior to such action (provided that if the kind and amount of
          securities, cash and other property receivable upon such
          consolidation, merger, sale, transfer or lease is not the same
          for each share of Common Stock, then for the purposes of the
          provisions described in this paragraph (a) the kind and amount of
          securities, cash and other property receivable upon exercise of
          the UNS Warrants immediately after such consolidation, merger,
          sale, transfer or lease shall be the kind and amount so
          receivable per share by the holders of a majority of the
          outstanding shares of Common Stock).

                    (b)  Each Registered Warrant Holder shall have the
          option to require the Company (or its successor) to redeem all or
          any part of such Registered Warrant Holder's UNS Warrants upon
          the consummation of any consolidation or merger of the Company
          with or into another person or any sale, transfer or lease to
          another person of all or substantially all the property of the
          Company.  A Registered Warrant Holder may exercise such option by
          giving to the Warrant Agent, within 10 business days after such
          Registered Warrant Holder's receipt of the notice given by the
          Company in respect of the consolidation, merger, sale, transfer
          or lease in question (or, if such notice is not timely given by
          the Company, at any time prior to such consummation), a written
          notice (a "Notice of Exercise") specifying (i) that such option
          is being exercised by such Registered Warrant Holder and (ii) the
          number of UNS Warrants as to which such option is being
          exercised.

               From and after the giving of any Notice of Exercise, each
          UNS Warrant covered thereby shall represent the right of the
          Registered Warrant Holder thereof to receive from the Company (or
          its successor), in immediately available funds on the date on
          which the consolidation, merger, sale, transfer or lease in
          question is consummated, an amount equal to the current market
          price of such UNS Warrant.  For purposes of this paragraph (b),
          the current market price of each UNS Warrant shall equal the
          average of the daily closing prices of the UNS Warrants for the
          20 consecutive trading days ending on the last full trading day
          on the exchange or market identified pursuant to the next
          succeeding sentence prior to the first public announcement of the
          consolidation, merger, sale, lease or transfer in question.  The
          closing price of the UNS Warrants for any day shall be determined
          in the same manner as the closing price of the Common Stock is
          determined under the anti-dilution provisions of the Warrant
          Agreement (described above).  If for any reason the daily closing
          price of the UNS Warrants during such 20-trading day period
          cannot be determined as provided in such sentence, current market
          price of each UNS Warrant shall equal the average fair market
          value for the 20 consecutive business days preceding such first
          public announcement, as determined by two members of the NASD
          selected in good faith by the Board of Directors of the Company.

                    The nonexercise of the foregoing option with respect to
          any UNS Warrant in connection with any consolidation, merger,
          sale, lease or transfer shall not preclude the exercise of such
          option with respect to such UNS Warrant in connection with any
          subsequent consolidation, merger, sale, lease or transfer.  In
          the case of any consolidation or merger in which the Company is
          not the surviving entity or in the case of any sale, lease or
          transfer, the Company shall cause its successor to agree in
          writing (and such consolidation, merger, sale, lease or transfer
          shall not be consummated without such agreement) that it shall be
          responsible for the performance of the Company's obligations
          described above.

               Miscellaneous.  Registered Warrant Holders will not be
          entitled, by virtue of being holders, to receive dividends or to
          consent or to receive notice as shareholders in respect of any
          meeting of shareholders for the election of directors of the
          Company or any other matter, or to vote at any such meeting, or
          to exercise any rights whatsoever as shareholders.

               The statements contained herein concerning the TEP Warrants,
          the UNS Warrants, the TEP Warrant Agreement and the Warrant
          Agreement do not purport to be complete and are qualified in
          their entirety by reference to the TEP Warrant Agreement and the
          Warrant Agreement. 


                                    WARRANT AGENT

               The Bank of New York serves as the Warrant Agent under the
          Warrant Agreement.

                                       21

<PAGE>


                             DESCRIPTION OF CAPITAL STOCK

               GENERAL

               The authorized capital stock of the Company presently
          consists of 76,000,000 shares, consisting of 75,000,000 shares of
          Common Stock without par value, and 1,000,000 shares of preferred
          stock without par value ("Preferred Stock").  As of August 7,
          1998 there were 32,147,080 shares of Common Stock outstanding and
          no shares of Preferred Stock outstanding.

               The following is a summary of certain rights and privileges
          of the holders of the Company's stock.  This summary does not
          purport to be complete.  Reference is made to the Company's
          Restated Articles of Incorporation and to the laws of the State
          of Arizona, the following information being qualified in its
          entirety by such reference.

               COMMON STOCK

               Dividend Rights.  Subject to certain limitations, if any,
          specified with respect to the Preferred Stock, or any series
          thereof, dividends may be paid on shares of Common Stock, out of
          any funds legally available therefor, when and as declared by the
          Company's Board of Directors.

               Liquidation Rights.  Subject to the limitations, if any,
          specified with respect to the Preferred Stock, or any series
          thereof, in the event of any dissolution or other winding up of
          the Company, whether voluntary or involuntary, the assets of the
          Company available for payment and distribution to shareholders
          shall be distributed ratably in accordance with their holdings to
          the holders of shares of the Common Stock.

               Voting Rights.  All voting power is vested in the holders of
          the Common Stock, except as and to the extent otherwise specified
          with respect to the Preferred Stock, or any series thereof.  Each
          holder of the Common Stock shall, in the election of directors
          and upon each other matter coming before any meeting of
          shareholders, be entitled to one (1) vote for each share of such
          stock outstanding in the name of such holder on the books of the
          Company.

               Miscellaneous.  The Common Stock has no preemptive or
          conversion rights or redemption or sinking fund provisions and
          the outstanding Common Stock is fully paid and non-assessable.

               PREFERRED STOCK

               The Board of Directors of the Company has authority to
          divide the Preferred Stock into series and to determine the
          designation, preferences, and voting powers of the shares of each
          series so established and the restrictions and qualifications
          thereof, all to the extent and in the manner provided by law.

                                       22


          <PAGE>


                CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES

               The following summary describes certain United States
          federal income tax consequences of the purchase, ownership and
          disposition of the 1999 UNS Warrants and 2000 UNS Warrants as of
          the date hereof.  Except where noted, it deals only with 1999 UNS
          Warrants and 2000 UNS Warrants held as capital assets and does
          not deal with special situations, such as those of dealers in
          securities or currencies, financial institutions, life insurance
          companies, persons holding 1999 UNS Warrants and 2000 UNS
          Warrants as a part of a hedging or conversion transaction or a
          straddle, or persons who are not United States Holders (as
          defined herein).  In addition, this discussion does not address
          the tax consequences to persons who acquire 1999 UNS Warrants and
          2000 UNS Warrants other than pursuant to their initial issuance
          and distribution.  Furthermore, the discussion below is based
          upon the provisions of the Internal Revenue Code of 1986, as
          amended, and regulations, rulings and judicial decisions
          thereunder as of the date hereof, and such authorities may be
          repealed, revoked or modified at any time, with either forward-
          looking or retroactive effect, so as to result in United States
          federal income tax consequences different from those discussed
          below.

               PROSPECTIVE HOLDERS OF 1999 UNS WARRANTS AND 2000 UNS
          WARRANTS, INCLUDING PERSONS WHO ARE NOT UNITED STATES HOLDERS AND
          PERSONS WHO PURCHASE 1999 UNS WARRANTS AND 2000 UNS WARRANTS IN
          THE SECONDARY MARKET, ARE ADVISED TO CONSULT WITH THEIR TAX
          ADVISORS AS TO THE UNITED STATES FEDERAL INCOME TAX CONSEQUENCES
          OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF 1999 UNS WARRANTS
          AND 2000 UNS WARRANTS IN LIGHT OF THEIR PARTICULAR CIRCUMSTANCES,
          AS WELL AS THE EFFECT OF ANY STATE, LOCAL OR OTHER TAX LAWS.

          UNITED STATES HOLDERS

               As used herein, a "United States Holder" means a Holder of a
          TEP Warrant that is (i) a citizen or resident of the United
          States, (ii) a corporation, partnership or other entity created
          or organized in or under the laws of the United States or any
          political subdivision thereof, (iii) an estate, the income of
          which is subject to United States federal income taxation
          regardless of its source, or (iv) a trust, the administration of
          which is subject to the primary supervision of a court within the
          United States and for which one or more United States persons
          have the authority to control all substantial decisions.

          EXCHANGE OF UNS WARRANTS FOR TEP WARRANTS

               An exchange of UNS Warrants for TEP Warrants should
          constitute a taxable event for federal income tax purposes.  As a
          result, a U.S. Holder will recognize gain or loss equal to the
          difference between the amount realized upon the exchange, and
          such U.S. Holder's adjusted tax basis in the TEP Warrants
          surrendered.  The amount realized upon the exchange will
          generally equal the fair market value of the UNS Warrants
          received.  A U.S. Holder's adjusted tax basis in the TEP Warrants
          exchanged will be, in general, such Holder's cost of the TEP
          Warrants.  Any such gain or loss recognized upon the exchange of
          UNS Warrants for TEP Warrants will be capital gain or loss.

               The Taxpayer Relief Act of 1997 includes substantial changes
          to the federal taxation of capital gains recognized by certain
          noncorporate taxpayers, such as individuals, including a 20%
          maximum rate for certain gains from the sale of capital assets
          held for more than 18 months.  The deductibility of capital
          losses is subject to limitations.

          SALE OR EXCHANGE OF THE UNS WARRANTS

               Upon the sale or exchange of UNS Warrants, a United States
          Holder will recognize gain or loss equal to the difference
          between such Holder's adjusted tax basis in the UNS Warrants and
          the amount realized upon the sale or exchange.  A United States
          Holder's adjusted tax basis in the UNS Warrants will be, in
          general, the fair market value of such warrants at the time they
          were received by such Holder.

                                       23

<PAGE>


          INFORMATION REPORTING AND BACKUP WITHHOLDING

               In general, information reporting will apply to payments to
          U.S. Holders other than certain exempt recipients (such as
          corporations) of the proceeds upon the sale of the UNS Warrants. 
          A 31% backup withholding tax will apply to such payments if the
          U.S. Holder (i) fails to provide a taxpayer identification
          number, (ii) furnishes an incorrect TIN, (iii) is notified by the
          Internal Revenue Service ("IRS") that it has failed to properly
          report payments of interest and dividends, or (iv) under certain
          circumstances, fails to certify, under penalty of perjury, that
          it has furnished a correct TIN and has not been notified by the
          IRS that it is subject to backup withholding.

               Any amounts withheld under the backup withholding rules will
          be allowed as a refund or a credit against such U.S. Holder's
          U.S. federal income tax liability provided the required
          information is furnished to the IRS.

                                       EXPERTS

               The consolidated financial statements incorporated in this
          Prospectus by reference from the 1997 10-K have been audited by
          Deloitte & Touche LLP, independent auditors, as stated in their
          report included in the 1997 10-K which is incorporated herein by
          reference, and have been so incorporated in reliance upon the
          report of such firm given upon their authority as experts in
          accounting and auditing.  

               With respect to the unaudited consolidated financial
          information of the Company and TEP for the three-month period
          ended March 31, 1998 and the six-month period ended 
          June 30, 1998, incorporated by reference
          in this Prospectus, PricewaterhouseCoopers LLP ("PwC") reported
          that they have applied limited procedures in accordance with
          professional standards for a review of such information. 
          However, their separate reports dated May 5, 1998 and August 4,
          1998, incorporated by reference herein, state that they did not
          audit and they do not express an opinion on that unaudited
          consolidated financial information.  PwC has not carried out any
          significant or additional audit tests beyond those which would
          have been necessary if their reports had not been included. 
          Accordingly, the degree of reliance on their reports on such
          information should be restricted in light of the limited nature
          of the review procedures applied.  PwC is not subject to the
          liability provisions of section 11 of the Securities Act of 1933
          for their reports on the unaudited consolidated financial
          information because neither such is a "report" or a "part" of the
          registration statement prepared or certified by PwC within the
          meaning of sections 7 and 11 of the Act.

                                       24


     <PAGE>


                                                           APPENDIX A


                                   WARRANT AGREEMENT dated as of        ,
                                                                 -------
                         1998, by and between UNISOURCE ENERGY CORPORATION,
                         an  Arizona corporation  (the "Company"),  and THE
                         BANK  OF  NEW  YORK,  as warrant  agent  (in  such
                         capacity, the "Warrant Agent").


                                     WITNESSETH:

                    WHEREAS,  the  Company  plans  to make  an  offer  (the
          "Exchange  Offer")  to the  holders of  any  and all  warrants to
          purchase shares of  common stock of Tucson Electric Power Company
          ("TEP"), an  Arizona corporation  and wholly owned  subsidiary of
          the Company (the "TEP  Warrants"), to exchange each of  their TEP
          Warrants for  warrants expiring  in  1999 to  purchase shares  of
          common  stock of  the  Company  (the  "1999  UNS  Warrants")  and
          warrants expiring in 2000  to purchase shares of common  stock of
          the  Company (the "2000 UNS Warrants" and, together with the 1999
          UNS Warrants, the "Warrants"); and

                    WHEREAS, the  Company desires the Warrant  Agent to act
          on behalf of the Company, and  the Warrant Agent is willing to so
          act,  in connection  with the  issuance,  registration, transfer,
          exchange  and  redemption  of   the  Warrants,  the  issuance  of
          certificates  representing  the  Warrants, the  exercise  of  the
          Warrants, and the rights of the holders thereof.

                    NOW,  THEREFORE, in consideration of the foregoing, the
          parties hereto hereby agree as follows:

                    SECTION 1.  Definitions.  As used herein, the following
                                -----------
          terms shall have the following meanings:

                    (a)  "Common Stock" shall mean  stock of the Company of
          any class,  whether now or  hereafter authorized,  which has  the
          right to participate  in the distribution of earnings  and assets
          of the Company without limit as to amount or percentage, which at
          the date  hereof consists of  75,000,000 shares of  Common Stock,
          without par value.

                    (b)  "Corporate Office" shall  mean, at  any time,  the
          office of  the Warrant  Agent at  which its  principal [corporate
          trust] business shall be administered, which office is located at
          the date hereof at                          , New York, New York 
                             -------------------------
          10286].

                    (c)  "Exercise Date" shall  mean, as  to each  Warrant,
          the date on which the Warrant Agent shall have received both  (i)
          the Warrant Certificate representing such Warrant, with a written
          notice, in substantially the form of the Election to Purchase set
          forth in Exhibits A and B hereto, which notice shall be completed
          and  duly  executed  by  the  Registered  Holder  thereof or  his
          attorney duly authorized in writing, and (ii) payment in cash, or


    <PAGE>


          by  official bank or certified check made payable to the Company,
          or by wire  transfer, of an amount in lawful  money of the United
          States of America equal to the applicable Purchase Price.

                    (d)  "Initial  Warrant Exercise Date" shall mean, as to
          each Warrant, the date of issuance of such Warrant.

                    (e)  "NASD"  shall  mean  The National  Association  of
          Securities Dealers, Inc.

                    (f)  "NASDAQ"  shall mean  The National  Association of
          Securities Dealers, Inc. Automated Quotation System.

                    (g)  "Purchase Price" shall mean the purchase price per
          share of Common Stock to be paid upon exercise of each Warrant in
          accordance with the terms hereof, which  price shall initially be
          $16.00  per  share,  subject  to  adjustment  from  time to  time
          pursuant to the provisions of Sections 8 and 10 hereof.

                    (h)  "Registered  Holder"  shall  mean each  person  in
          whose  name   any  certificate  representing  Warrants  shall  be
          registered  from  time to  time on  the  books maintained  by the
          Warrant Agent pursuant to Section 6 hereof.  

                    (i)  "Transfer Agent" shall mean  The Bank of New York,
          as the Company's transfer agent, or its authorized  successor, as
          such.

                    (j)  "Warrant  Certificates" shall  mean, collectively,
          warrant  certificates for the  1999 UNS  Warrants (the  "1999 UNS
          Warrant Certificates") and warrant  certificates for the 2000 UNS
          Warrants (the "2000 UNS Warrant Certificates").

                    (k)  "Warrant  Expiration Date"  shall  mean  (i)  with
          respect  to the  1999  UNS Warrants,  4:00 p.m.  (Tucson, Arizona
          time) on  March 15, 1999, and  (ii) with respect to  the 2000 UNS
          Warrants, 4:00 p.m.  (Tucson, Arizona time) on December 15, 2000;
          provided  that if either such date  shall in the State of Arizona
          or the State of New York be a holiday or a day on which banks are
          required or  authorized to  be  closed, then  4:00 p.m.  (Tucson,
          Arizona time) on  the next  following day which  in the State  of
          Arizona  and the State of  New York is not a  holiday or a day on
          which banks are required or authorized to be closed.

                    SECTION 2.  Warrants and Issuance of Warrant
                                --------------------------------
          Certificates. (a) Each Warrant shall initially represent the right
          ------------
          to purchase from the Company, subject to the conditions contained
          herein  and in  the  related Warrant  Certificate,  one share  of
          Common  Stock upon  the exercise  thereof, subject  to adjustment
          from time to time pursuant to the provisions of Sections 8 and 10
          hereof.


                                      2
     <PAGE>

                    (b)  Upon   execution   of   this  Agreement,   Warrant
          Certificates representing an aggregate of       1999 UNS Warrants
                                                    -----
          and        2000 UNS Warrants shall be (i) executed on behalf of the
              -----
          Company  in  accordance  with  Section  3  and  (ii)  issued  and
          delivered  to the  Warrant  Agent.   Upon  written order  of  the
          Company signed by its President or  any Vice President and by its
          Secretary  or an  Assistant  Secretary, the  Warrant Certificates
          shall  be  countersigned, issued  and  delivered  by the  Warrant
          Agent.

                    (c)  From time  to time,  up to the  Warrant Expiration
          Date,  the Transfer  Agent  shall countersign  and deliver  stock
          certificates  in required whole number denominations representing
          one  share of Common Stock for each Warrant exercised, subject to
          adjustment  as described herein, upon the exercise of Warrants in
          accordance with this Agreement.

                    (d)  From time to time  through the Warrant  Expiration
          Date,  the Warrant  Agent shall  countersign and  deliver Warrant
          Certificates to  the persons entitled thereto  in connection with
          any  registration of  transfer or  exchange permitted  under this
          Agreement; provided that no  Warrant Certificates shall be issued
          except  (i) those  issued  pursuant to  Section 2(b),  (ii) those
          issued  on or after the  Initial Warrant Exercise  Date, upon the
          exercise of fewer  than all Warrants  represented by any  Warrant
          Certificate,  to evidence  any unexercised  Warrants held  by the
          exercising  Registered  Holder,  (iii)   those  issued  upon  any
          registration of transfer or exchange pursuant to Section 6,  (iv)
          those  issued  in  replacement  of  lost,  stolen,  destroyed  or
          mutilated Warrant Certificates  pursuant to Section 7  and (v) at
          the option of the Company, in such form as may be approved by its
          Board of  Directors, to reflect  any adjustment made  pursuant to
          Section 8 or 10 hereof.

                    SECTION 3.  Form and Execution of Warrant Certificates.
                                ------------------------------------------
          The 1999  UNS Warrant Certificates shall be  substantially in the
          form  annexed  hereto  as Exhibit  A  and  the  2000 UNS  Warrant
          Certificates shall be substantially in the form annexed hereto as
          Exhibit B, and such  Warrant Certificates may have  such letters,
          numbers or other marks of identification or designation  and such
          legends,  summaries  or  endorsements  printed,  lithographed  or
          engraved thereon as the  Company may deem appropriate and  as are
          not inconsistent with the provisions of this Agreement, or as may
          be required to comply with any law or with any rule or regulation
          made pursuant thereto or with any rule or regulation of any stock
          exchange on  which the Warrants may  be listed, or  to conform to
          usage.    Each Warrant  Certificate shall  be  dated the  date of
          issuance  thereof (whether upon initial issuance, registration of
          transfer, exchange or replacement) and issued in registered form.
          Warrant Certificates shall be numbered serially with the letter W
          on Warrant Certificates of all denominations.

                    Warrant Certificates shall be executed on behalf of the
          Company  by  its Chairman  of the  Board,  President or  any Vice
          President and by its  Treasurer or an Assistant Treasurer  or its
          Secretary or an  Assistant Secretary, by manual  signatures or by
          facsimile signatures  printed thereon,  and shall have  imprinted
          thereon a facsimile of the Company's seal.   Warrant Certificates
          shall  be manually countersigned  by the Warrant  Agent and shall

                                      3
     <PAGE>

          not  be valid for  any purpose unless so  countersigned.  In case
          any officer  of the  Company  who shall  have signed  any of  the
          Warrant  Certificates  shall  cease  to be  such  officer  of the
          Company before the date of issuance or before countersignature by
          the  Warrant   Agent  and  issue  and  delivery  thereof  to  the
          applicable  Registered  Holders,  such  Warrant  Certificates may
          nevertheless be  countersigned by  the Warrant Agent,  issued and
          delivered with the same force and effect as though the person who
          signed  such  Warrant Certificates  had  not  ceased  to be  such
          officer of the  Company.  After  countersignature by the  Warrant
          Agent,  Warrant Certificates  shall be  delivered by  the Warrant
          Agent to  the  Registered Holder  without further  action by  the
          Company,  except as otherwise provided  by Section 4  hereof.  In
          case   the  Company  shall  change  its  name  or  its  state  of
          incorporation,   Warrant   Certificates  bearing   the  Company's
          previous  name  or state  of incorporation  shall continue  to be
          valid for all purposes.

                    SECTION 4.  Exercise, Each Warrant may be exercised by 
                                --------
          the Registered Holder thereof at any time on or after the Initial
          Warrant Exercise Date, but not after the Warrant Expiration Date,
          upon the terms and subject to the conditions set forth herein and
          in the related Warrant Certificate.  As soon as practicable on or
          after  the  Exercise Date  the  Warrant Agent  shall  deposit the
          proceeds received from the exercise of a Warrant and shall notify
          the Company in writing of the exercise of the Warrants.  Promptly
          following, and in any  event within seven days after the  date of
          such  notice from the Warrant Agent, the Warrant Agent, on behalf
          of  the Company, shall  cause to be  issued and delivered  by the
          Transfer  Agent, to the person or persons entitled to receive the
          same,   a   certificate  or   certificates  for   the  securities
          deliverable  upon such  exercise,  unless prior  to  the date  of
          issuance  of such  certificates  the Company  shall instruct  the
          Warrant  Agent   to  refrain   from  causing  such   issuance  of
          certificates pending  clearance of checks received  in payment of
          the  Purchase  Price  pursuant  to  such  Warrants.    The  stock
          certificate  or  certificates  so  delivered  shall  be  in  such
          denominations  as may  be specified  in such  notice or,  if such
          notice  shall not  specify  denominations,  a single  certificate
          representing all  the shares of  Common Stock issuable  upon such
          exercise shall be delivered, and  in either case such certificate
          or certificates shall  be issued  in the name  of the  exercising
          Registered  Holder  or  such other  name  or  names  as shall  be
          designated  in such  notice.   Such  certificate or  certificates
          shall be deemed to  have been issued, and such  Registered Holder
          or any other  person so designated to  be named therein  shall be
          deemed for all purposes to have become a holder of record of such
          shares, as of the related Exercise Date.  If a Warrant shall have
          been exercised  only in part,  the Company shall, at  the time of
          delivery  of  the applicable  stock certificate  or certificates,
          deliver  to  the  applicable  Registered  Holder  a  new  Warrant
          Certificate  to evidence  any unexercised  Warrants held  by such
          Registered  Holder, which  new Warrant  Certificate shall  in all
          other  respects   be  identical  with   the  Warrant  Certificate
          surrendered.  Upon the  exercise of any Warrant and  clearance of
          the  funds received, the  Warrant Agent shall  promptly remit the
          payment received for the Warrant to the Company or as the Company
          may direct in  writing, subject  to the provisions  of Section  4
          hereof.

                    SECTION 5.  Reservation of Shares; Listing; Payment of
                                ------------------------------------------
          Taxes, etc. (a) The Company covenants that it will at all times
          -----------
          reserve  and keep available  out of its  authorized Common Stock,


                                      4
     <PAGE>


          solely for the purpose  of issue upon exercise of  Warrants, such
          number of shares of  Common Stock as shall then  be issuable upon
          the exercise of all outstanding  Warrants.  The Company covenants
          that all shares of Common Stock issued from time to time upon the
          exercise  of Warrants  shall  be duly  and validly  issued, fully
          paid,  nonassessable and  free from  all  taxes, liens  and other
          charges,  and that upon issuance  such shares shall  be listed on
          each national securities exchange  (including NASDAQ), if any, on
          which any other shares of outstanding Common Stock of the Company
          are then listed.

                    (b)  The  Company  shall pay  all  expenses, taxes  and
          other  charges  payable  in  connection   with  the  preparation,
          issuance  and   delivery  of   stock  certificates  and   Warrant
          Certificates; provided, however, that (i) if stock certificates or
                        --------  -------      
          new  Warrant Certificates are to be delivered in a name other
          than the name of the related Registered Holder, all transfer taxes
          payable as a result of such transfer  shall  be  paid  by such
          Registered  Holder  and  (ii) delivery  by  the Company  of stock
          certificates or  new Warrant Certificates  in  connection  with
          such transfer  shall  not  be  required hereunder unless such
          transfer taxes, if any, shall have been paid.

                    (c)  The Warrant Agent is hereby irrevocably authorized
          to requisition the Company's Transfer Agent from time to time for
          certificates representing  shares of Common  Stock issuable  upon
          exercise  of the  Warrants, and  the Company  will authorize  the
          Transfer  Agent to comply with all such proper requisitions.  The
          Company  will file  with  the Warrant  Agent a  statement setting
          forth the  name and address of the  Transfer Agent of the Company
          for shares of Common Stock issuable upon exercise of the Warrants
          if the Transfer Agent is other than that named in Section 1(i).

                    SECTION 6.  Exchange and Registration of Transfer.  
                                -------------------------------------
          (a)  Warrant Certificates for 1999  UNS Warrants may be exchanged
          for  other 1999  UNS Warrant  Certificates representing  an equal
          aggregate number  of 1999  UNS Warrants and  Warrant Certificates
          for 2000 UNS Warrants may be exchanged for other 2000 UNS Warrant
          Certificates representing  an equal aggregate number  of 2000 UNS
          Warrants.     The  transfer   of  Warrant  Certificates   may  be
          registered,  in whole  or in  part.   Warrant Certificates  to be
          exchanged shall be surrendered to the Warrant Agent at its Corpo-
          rate Office,  and upon satisfaction  of the terms  and provisions
          hereof, the  Company shall execute,  and the Warrant  agent shall
          countersign, issue  and deliver in exchange  therefor the Warrant
          Certificate or  Certificates requested by  the Registered  Holder
          making the exchange.

                    (b)  The  Warrant  Agent shall  keep  at  its Corporate
          Office books in which, subject to such  reasonable regulations as
          it may prescribe, it shall register Warrant Certificates and  the
          transfer  thereof.   Upon  due  presentment  for registration  of
          transfer of any Warrant Certificate at such office or agency, the
          Company shall  execute, and the Warrant  Agent shall countersign,
          issue and deliver to the transferee or transferees a new 1999 UNS
          Warrant Certificate  or Certificates  or a new  2000 UNS  Warrant
          Certificate or Certificates,  as the case may be, representing an
          equal aggregate number of 1999 UNS Warrants or 2000 UNS Warrants,


                                      5
     <PAGE>


          as the case may be.  Notwithstanding the foregoing, a Warrant may
          be exercised by  a new  Registered Holder without  a new  Warrant
          Certificate having been issued.

                    (c)  With respect to all Warrant Certificates presented
          for registration of transfer,  (i) an assignment in substantially
          the form of the Assignment  set forth in Exhibits A and  B hereto
          shall  be duly executed, or  (ii) such Warrant Certificates shall
          be accompanied by a written instrument or instruments of transfer
          in form satisfactory  to the  Company and the  Warrant Agent  and
          duly executed  by the  Registered Holder or  its attorney-in-fact
          duly authorized in writing.

                    (d)  All    Warrant    Certificates    presented    for
          registration  of transfer  or surrendered  for exchange  shall be
          promptly canceled by the Warrant Agent and thereafter retained by
          the  Warrant  Agent  until  termination  of  this  Agreement,  or
          resignation  of the  Warrant Agent,  or until  destroyed, at  the
          discretion of the Company.

                    (e)  Prior  to  due  presentment  for  registration  of
          transfer  thereof, the Company and the Warrant Agent may deem and
          treat the  Registered Holder  of any  Warrant Certificate  as the
          absolute owner and holder thereof and of each Warrant represented
          thereby (notwithstanding any  notations of  ownership or  writing
          thereon made by any  person other than a duly  authorized officer
          of the Company or  Warrant Agent) for all purposes  and shall not
          be affected by any notice to the contrary.

                    SECTION 7.  Loss or Mutilation.  Upon receipt by the 
                                ------------------
          Company and the Warrant Agent of evidence satisfactory to them of
          the ownership of  and loss, theft,  destruction or mutilation  of
          any   Warrant  Certificate  and  (in  case   of  loss,  theft  or
          destruction) of indemnity satisfactory to them or (in the case of
          mutilation) upon surrender and cancellation thereof, the  Company
          shall  execute and  the Warrant  Agent shall  (in the  absence of
          notice to  the  Company and/or  Warrant  Agent that  the  Warrant
          Certificate  has   been  acquired  by  a   bona  fide  purchaser)
          countersign and  deliver to  the applicable Registered  Holder in
          lieu thereof a new 1999 UNS Warrant Certificate or a new 2000 UNS
          Warrant  Certificate, as the case  may be, of  like tenor, repre-
          senting  an equal aggregate number of Warrants.  Applicants for a
          substitute Warrant Certificate under  this Section 7 shall comply
          with such  other reasonable  regulations and pay  such reasonable
          charges as the Company and the Warrant Agreement may prescribe.

                    SECTION 8.  Adjustment of Exercise Price and Number of
                                ------------------------------------------
          Shares of Common Stock.  The number and kind of shares purchasable 
          ----------------------
          upon the exercise  of Warrants  and the Purchase  Price shall  be
          subject to adjustment from time to time as follows:

                    (a)  Changes in Common Stock, In the event the Company
                         -----------------------
          shall, at  any time or from  time to time after  the date hereof,
          (i)  issue any shares of Common Stock  as a stock dividend to the
          holders  of   Common  Stock,   (ii)  subdivide  or   combine  the
          outstanding shares  of  Common Stock  into  a greater  or  lesser
          number of shares or  (iii) issue any shares of its  capital stock
          in a reclassification or reorganization  of the Common Stock (any


                                      6

     <PAGE>


          such  issuance,  subdivision,  combination,  reclassification  or
          reorganization being  herein called  a "Change of  Shares"), then
          (A) in  the case of  (i) or (ii)  above, the number  of shares of
          Common  Stock that  may be  purchased upon  the exercise  of each
          Warrant  shall be adjusted   to  the number  of shares  of Common
          Stock that the Registered Holder of such Warrant would have owned
          or  have been  entitled to  receive after  the happening  of such
          event had such  Warrant been exercised  immediately prior to  the
          record date (or, if there is  no record date, the effective date)
          for such event, and  the Purchase Price shall be adjusted  to the
          price (calculated to the nearest 1,000th of one cent)  determined
          by multiplying the Purchase Price immediately prior to such event
          by  a fraction  the numerator  of which  shall be  the  number of
          shares of  Common Stock purchasable with  one Warrant immediately
          prior  to such event  and the denominator  of which  shall be the
          number of  shares of  Common Stock purchasable  with one  Warrant
          after the  adjustment referred to  above and (B)  in the case  of
          (iii) above, paragraph (l) below shall apply.  An adjustment made
          pursuant  to  clause  (A)  of  this  paragraph (a)  shall  become
          effective retroactively immediately after  the record date in the
          case of a dividend  and shall become effective immediately  after
          the effective date in  other cases.   Any shares of Common  Stock
          purchasable  solely as a result  of such adjustment  shall not be
          issued prior to the effective date of such event.

                    (b)  Common Stock Distribution.  In the event the Company
                         -------------------------
          shall, at  any time or from  time to time after  the date hereof,
          issue, sell or  otherwise distribute any  shares of Common  Stock
          (other than pursuant to a Change of Shares or the exercise of any
          Option, Convertible  Security (each  as defined in  paragraph (c)
          below) or Warrant (any such event,  including any event described
          in  paragraphs (c) and (d)  below, being herein  called a "Common
          Stock Distribution"), for a consideration per share less than the
          current market price  per share  of Common Stock  (as defined  in
          paragraph  (f)   below)  on  the   date  of  such   Common  Stock
          Distribution,   then,   effective   upon   such    Common   Stock
          Distribution, the Purchase  Price shall be  reduced to the  price
          (calculated  to the  nearest 1,000th  of one cent)  determined by
          multiplying  the Purchase  Price in  effect immediately  prior to
          such Common Stock  Distribution by a  fraction, the numerator  of
          which shall  be the  sum of  (i) the number  of shares  of Common
          Stock outstanding (exclusive of any  treasury shares) immediately
          prior to such Common Stock Distribution multiplied by the current
          market price per share of Common Stock on the date of such Common
          Stock Distribution, plus (ii) the consideration, if any, received
          by  the Company  upon  such  Common  Stock Distribution  and  the
          denominator of which shall be the product of (A) the total number
          of shares of Common Stock  outstanding (exclusive of any treasury
          shares)   immediately  after   such  Common   Stock  Distribution
          multiplied  by (B) the current  market price per  share of Common
          Stock on the date of such Common Stock Distribution.

                    If  any  Common  Stock  Distribution  shall  require an
          adjustment  to  the  Purchase  Price pursuant  to  the  foregoing
          provisions  of  this  paragraph  (b) including  by  operation  of
          paragraph  (c) or  (d) below,  then, effective  at the  time such
          adjustment  is  made,  the  number  of  shares  of  Common  Stock
          purchasable upon the exercise of each  Warrant shall be increased
          to a number determined  by multiplying the number of  such shares
          so   purchasable  immediately   prior   to  such   Common   Stock
          Distribution by a fraction,  the numerator of which shall  be the


                                      7
     <PAGE>


          Purchase Price in effect immediately prior to such adjustment and
          the  denominator of which shall  be the Purchase  Price in effect
          immediately  after such  adjustment.    In computing  adjustments
          under this paragraph, fractional  interests in Common Stock shall
          be taken into account to the nearest 1,000th of a share.

                    The  provisions  of this  paragraph  (b),  including by
          operation of paragraph  (c) or  (d) below, shall  not operate  to
          increase the Purchase  Price or  reduce the number  of shares  of
          Common Stock purchasable upon the exercise of any Warrant.

                    (c)  Issuance of Options.  In the event the Company 
                         -------------------
          shall,  at any time  or from time  to time after  the date hereof
          issue,  sell,  distribute  or   otherwise  grant  in  any  manner
          (including  by assumption)  any  rights to  subscribe  for or  to
          purchase,  or any warrants or options for the purchase of, Common
          Stock or any stock or securities convertible into or exchangeable
          for  Common Stock  (any such  rights, warrants  or options  being
          herein called "Options" and  any such convertible or exchangeable
          stock    or   securities   being   herein   called   "Convertible
          Securities"),  whether  or  not such  Options  or  the  rights to
          convert  or exchange such  Convertible Securities are immediately
          exercisable, and the  price per  share at which  Common Stock  is
          issuable upon the exercise of such Options or upon the conversion
          or  exchange  of  such   Convertible  Securities  (determined  by
          dividing (i) the aggregate amount, if any, received or receivable
          by the Company as consideration for the issuance, sale, distribu-
          tion or  granting  of such  Options, plus  the minimum  aggregate
          amount  of  additional  consideration,  if any,  payable  to  the
          Company  upon the exercise of all such Options, plus, in the case
          of  Options  to  acquire  Convertible  Securities,  the   minimum
          aggregate  amount of  additional consideration,  if any,  payable
          upon  the   conversion  or  exchange  of   all  such  Convertible
          Securities,  by (ii) the total maximum number of shares of Common
          Stock issuable upon the exercise of all such Options or upon  the
          conversion or  exchange  of all  Convertible Securities  issuable
          upon the exercise  of all  such Options) shall  be less than  the
          current market price per share of Common Stock on the date of the
          issuance, sale,  distribution or  granting of such  Options then,
          for  purposes of paragraph (b) above, the total maximum number of
          shares of Common  Stock issuable  upon the exercise  of all  such
          Options or upon the  conversion or exchange of the  total maximum
          amount of  the Convertible Securities issuable  upon the exercise
          of all such Options shall be deemed to have been issued as of the
          date  of the  issuance, sale,  distribution or  granting of  such
          Options  and thereafter shall be deemed to be outstanding and the
          Company shall be  deemed to have  received as consideration  such
          price per  share, determined as provided above, therefor.  Except
          as  otherwise  provided  in  paragraphs (j)  and  (k)  below,  no
          additional adjustment of  the Purchase Price  shall be made  upon
          the  actual  exercise  of  such  Options  or  upon conversion  or
          exchange of the Convertible Securities issuable upon the exercise
          of such Options.

                    (d)  Issuance of Convertible Securities.  In the event 
                         ----------------------------------
          the Company  shall, at any  time or from  time to time  after the
          date hereof,  issue, sell  or otherwise distribute  (including by
          assumption) any  Convertible  Securities  (other  than  upon  the
          exercise of any Option), whether or not the  rights to convert or
          exchange such Convertible Securities are immediately exercisable,
          and  the price per share  at which Common  Stock is issuable upon


                                      8
     <PAGE>


          the  conversion  or  exchange   of  such  Convertible  Securities
          (determined  by  dividing  (i)  the  aggregate  amount,  if  any,
          received or receivable  by the Company  as consideration for  the
          issuance,  sale or  distribution of such  Convertible Securities,
          plus the minimum aggregate amount of additional consideration, if
          any,  payable to the Company  upon the conversion  or exchange of
          all such Convertible Securities, by (ii) the total maximum number
          of shares  of  Common  Stock  issuable  upon  the  conversion  or
          exchange  of all such Convertible  Securities) shall be less than
          the current market price per share of Common Stock on the date of
          such  issuance,  sale  or  distribution, then,  for  purposes  of
          paragraph (b) above, the total maximum number of shares of Common
          Stock  issuable  upon  the conversion  or  exchange  of  all such
          Convertible  Securities shall be deemed to have been issued as of
          the  date  of  the   issuance,  sale  or  distribution   of  such
          Convertible  Securities  and thereafter  shall  be  deemed to  be
          outstanding and the Company  shall be deemed to have  received as
          consideration such price per share, determined as provided above,
          therefor.  Except as otherwise provided in paragraphs (j) and (k)
          below,  no additional adjustment  of the Purchase  Price shall be
          made upon  the actual conversion or exchange  of such Convertible
          Securities.

                    (e)  Dividends and Distributions.  In the event the 
                         ---------------------------
          Company shall,  at any time or  from time to time  after the date
          hereof, distribute to the holders of Common Stock any dividend or
          other distribution of cash,  evidences of its indebtedness, other
          securities  or other properties or assets in each case other than
          (i)  dividends payable  in  Common Stock  Options or  Convertible
          Securities and (ii)  any cash  dividend that, when  added to  all
          other   cash  dividends  paid  in  the  one  year  prior  to  the
          declaration  date  of such  dividend  (excluding  any such  other
          dividend included in a previous adjustment of the  Purchase Price
          pursuant  to this  paragraph  (e), does  not  exceed 10%  of  the
          current   market  price  per  share   of  Common  Stock  on  such
          declaration date),  or any options,  warrants or other  rights to
          subscribe  for or  purchase any  of the  foregoing, then  (A) the
          Purchase  Price shall  be  decreased  to  a price  determined  by
          multiplying  the Purchase Price then in effect by a fraction, the
          numerator of which shall be the current market price per share of
          Common  Stock on the record  date for such  distribution less the
          sum of (X)  the cash portion,  if any, of  such distribution  per
          share  of Common  Stock  outstanding (exclusive  of any  treasury
          shares) on the  record date  for such distribution  plus (Y)  the
          then fair market value (as determined  in good faith by the Board
          of  Directors  of  the  Company)   per  share  of  Common   Stock
          outstanding (exclusive of any treasury shares) on the record date
          for  such  distribution  of   that  portion,  if  any,  of   such
          distribution  consisting  of  evidences  of  indebtedness,  other
          securities, properties, assets, options, warrants or subscription
          or  purchase rights, and the  denominator of which  shall be such
          current market price per share of Common Stock and (B) the number
          of shares of Common  Stock purchasable upon the exercise  of each
          Warrant shall be increased to  a number determined by multiplying
          the number of shares of  Common Stock so purchasable  immediately
          prior to the record date for such distribution by a fraction, the
          numerator  of  which  shall  be  the  Purchase  Price  in  effect
          immediately prior  to the  adjustment required  by clause  (A) of
          this  sentence and the denominator of which shall be the Purchase
          Price  in   effect  immediately  after  such   adjustment.    The
          adjustments required by this paragraph (e) shall be made whenever
          any  such distribution is made  and shall become  effective as of


                                      9
     <PAGE>


          the  date of such distribution retroactive to the record date for
          the  determination  of  stockholders  entitled  to  receive  such
          distribution.

                    (f)  Current Market Price.  For the purpose of any 
                         --------------------
          computation under  paragraphs  (b),  (c),  (d) and  (e)  of  this
          Section,  the current market price  per share of  Common Stock at
          any date shall be the average of the daily closing prices for the
          shorter of (i) the 20 consecutive trading days ending on the last
          full  trading  day on  the exchange  or  market specified  in the
          second succeeding sentence prior to the Time of Determination and
          (ii)  the period commencing on the date next succeeding the first
          public  announcement  of  the  issuance,  sale,  distribution  or
          granting  in question through such last full trading day prior to
          the Time of Determination.   The term "Time of  Determination" as
          used herein shall be the time and date of the earlier to occur of
          (A) the  date as  of  which the  current market  price  is to  be
          computed and  (B) the last full  trading day on  such exchange or
          market before  the commencement  of "ex-dividend" trading  in the
          Common  Stock relating to the event giving rise to the adjustment
          required  by paragraph (b),  (c), (d) or (e).   The closing price
          for any day shall be the last reported sale price regular way or,
          in  case no  such  reported sale  takes  place on  such  day, the
          average of the  closing bid and asked prices regular way for such
          day,  in  each case  (1)  on  the  principal national  securities
          exchange on which  the shares of  Common Stock  are listed or  to
          which such  shares are admitted  to trading or (2)  if the Common
          Stock  is not  listed  or  admitted  to  trading  on  a  national
          securities exchange, in  the over-the-counter market  as reported
          by NASDAQ or any comparable system  or (3) if the Common Stock is
          not listed on NASDAQ or a  comparable system, as furnished by two
          members  of the NASD selected from time  to time in good faith by
          the Board of  Directors of the Company for that  purpose.  In the
          absence of all of the  foregoing, or if for any other  reason the
          current  market price per share  cannot be determined pursuant to
          the  foregoing  provisions of  this  paragraph  (f), the  current
          market price per share shall be the  fair market value thereof as
          determined  in  good  faith by  the  Board  of  Directors of  the
          Company.

                    (g)  Certain Distributions.  If the Company shall pay a
                         ---------------------
          dividend or  make any  other distribution  payable in Options  or
          Convertible Securities, then, for purposes of paragraph (b) above
          (by operation of paragraph (c) or (d) above, as the case may be),
          such Options or  Convertible Securities shall  be deemed to  have
          been issued or sold without consideration.

                    (h)  Consideration Received.  If any shares of Common 
                         ----------------------
          Stock, Options or Convertible Securities shall be issued, sold or
          distributed  for  cash,  the  consideration  received  in respect
          thereof shall be deemed to be the amount received by  the Company
          therefor, after deduction from such amount of any expenses incurred
          and any underwriting commissions or concessions paid or allowed by
          the Company in connection therewith; provided, however, that the
                                               --------  -------
          expenses, commissions and concessions relating to any  particular
          issuance,  sale or distribution for cash shall not be so deducted
          if,  on or prior to the date  thereof, the Company furnishes each
          Registered Holder with an officer's certificate representing that
          such  expenses,  commissions  and  concessions   are  recoverable
          through customer rates.   If any shares of Common  Stock, Options
          or Convertible  Securities shall  be issued, sold  or distributed


                                      10
     <PAGE>


          for  a  consideration   other  than  cash,  the   amount  of  the
          consideration other than cash received by  the Company in respect
          thereof shall be deemed to be  the then fair market value of such
          consideration  (as  determined in  good  faith  by  the Board  of
          Directors  of  the  Company),  after deduction  of  any  expenses
          incurred and any underwriting  commissions or concessions paid or
          allowed by the Company  in connection therewith.  If  any Options
          shall be issued in connection with the issuance and sale of other
          securities  of  the Company    together  comprising one  integral
          transaction in  which no  specific consideration is  allocated to
          such Options by the parties thereto, such Options shall be deemed
          to have been issued without consideration.

                    (i)  Deferral of Certain Adjustments.  No adjustment to
                         -------------------------------
          the  Purchase  Price (including  the  related  adjustment to  the
          number of shares of Common Stock purchasable upon the exercise of
          each Warrant) shall be required hereunder unless such adjustment,
          together with other adjustments carried forward as provided below,
          would result in an increase or decrease of at least one percent of
          the Purchase Price; provided, however, that any  adjustments which 
                              --------  -------
          by reason of this paragraph (i) are not required to be made shall
          be  carried  forward and  taken  into account  in  any subsequent
          adjustment.  No  adjustment need be made for a  change in the par
          value of the Common Stock.

                    (j)  Changes in Options and Convertible Securities.  If
                         ---------------------------------------------
          the exercise price  provided for  in any Options  referred to  in
          paragraph  (c)  above,  the  additional  consideration,  if  any,
          payable  upon  the  conversion  or exchange  of  any  Convertible
          Securities referred to in paragraph (c) or (d) above, or the rate
          at which  any Convertible Securities referred to in paragraph (c)
          or  (d) above  are convertible  into or  exchangeable for  Common
          Stock shall change at any time (other than under or  by reason of
          provisions  designed to  protect against  dilution upon  an event
          which  results in a  related adjustment pursuant  to this Section
          8), the Purchase Price then in effect and the number of shares of
          Common Stock purchasable upon  the exercise of,each Warrant shall
          forthwith  be  readjusted (effective  only  with  respect to  any
          exercise of any Warrant after such readjustment) to the  Purchase
          Price  and number of shares  of Common Stock  so purchasable that
          would  then be  in  effect  had  the  adjustment  made  upon  the
          issuance,  sale,  distribution or  granting  of  such Options  or
          Convertible Securities been made based upon such changed purchase
          price, additional  consideration or conversion rate,  as the case
          may be, but  only with  respect to such  Options and  Convertible
          Securities as then remain outstanding.

                    (k)  Expiration of Options and Convertible Securities. 
                         ------------------------------------------------
          If, at any time after  any adjustment to the number of  shares of
          Common Stock purchasable upon the exercise  of each Warrant shall
          have been made  pursuant to paragraph  (c), (d)  or (j) above  or
          this paragraph  (k), any Options or  Convertible Securities shall
          have  expired   unexercised,  the   number  of  such   shares  so
          purchasable shall, upon such  expiration, be readjusted and shall
          thereafter  be such  as  they  would  have  been  had  they  been
          originally  adjusted (or  had  the original  adjustment not  been
          required, as the case may be) as if (i) the only shares of Common
          Stock  deemed to have been issued in connection with such Options
          or Convertible Securities  were the  shares of  Common Stock,  if


                                      11
     <PAGE>


          any, actually issued or sold upon the exercise of such Options or
          Convertible Securities and  (ii) such shares of Common  Stock, if
          any, were issued  or sold for the consideration actually received
          by the Company upon such exercise plus the aggregate consideration,
          if any, actually received by the Company for the issuance, sale,
          distribution or granting of all such Options or Convertible
          Securities, whether or not exercised; provided, however, that no
                                                --------  -------
          such readjustment shall have  the effect  of  decreasing the number
          of such  shares  so purchasable by  an amount (calculated by
          adjusting such decrease to account  for  all  other adjustments
          made  pursuant  to  this Section  8  and Section  10 following  the
          date of  the original adjustment  referred to  above) in  excess of
          the amount  of the adjustment  initially  made in  respect  of  the
          issuance,  sale, distribution orgranting of such Optionsor
          Convertible Securities.

                    (l)  Other Adjustments.  In the event that at any time,
                         -----------------
          as a result of an  adjustment made pursuant to this Section  8 or
          Section  10,  the Registered  Holders  shall  become entitled  to
          receive any securities of the Company other than shares of Common
          Stock,  thereafter  the  number   of  such  other  securities  so
          receivable upon  exercise of the Warrants and  the Purchase Price
          applicable to such exercise  shall be subject to adjustment  from
          time  to time in  a manner and  on terms as  nearly equivalent as
          practicable  to  the provisions  with  respect to  the  shares of
          Common Stock contained in this Section 8 and Section 10.

                    (m)  Excluded Transactions.  Notwithstanding any 
                         ---------------------
          provision  in this Section 8 to the contrary, no adjustment shall
          be made pursuant to this Section 8 in respect of (i) the granting
          of any Options or the issuance of any shares of Common Stock that
          may be registered  on Form S-8  or any  successor form under  the
          Securities Act of 1933, as amended, to any officers, directors or
          employees of, or any  consultants or advisors to, the  Company or
          any  of  its affiliates,  or (ii)  the  issuance of  Common Stock
          pursuant to  any dividend  reinvestment or direct  stock purchase
          plan  which provides that the price of the Common Stock purchased
          for plan participants from the Company will be the average of the
          high and low sales prices of the Common Stock as  reported on the
          consolidated  transaction reporting  system  on  the   day  the
          investment is made or, if no  trading in the Common Stock  occurs
          on  such date, the next preceding date on which trading occurred;
          provided, however, that clause (i) of this paragraph (m) shall not
          --------  -------
          apply to any such grant or  issuance if, after giving effect
          thereto, the aggregate  amount  of Common  Stock  issued  in all
          transactions  covered  by  clause  (i)  of this  paragraph  (m)
          (assuming  the exercise  of  all  then   outstanding  Options
          granted  in  such transactions) would exceed 5%  of the number of
          shares  of Common Stock  then outstanding (after  giving effect
          to  the exercise of all then outstanding  Options so granted but
          before giving effect to any other exercise of Options or Convertible
          Securities).

                    SECTION 9.  Notice of Adjustment.  Whenever the Purchase
                                --------------------
          Price or the number of  shares of Common Stock or other  property
          purchasable  upon the exercise of  any Warrant is  required to be
          adjusted as  herein provided, the Company  promptly shall deliver
          to the  Warrant  Agent,  and the  Warrant  Agent  shall  promptly
          forward to each Registered Holder,  notice of such adjustment and
          a  certificate  of  a  firm  of  independent  public  accountants
          selected by the Board of Directors of the Company (who may be the


                                      12
     <PAGE>


          regular  accountants employed  by the  Company) setting  forth in
          reasonable detail (a) the Purchase Price and the number of shares
          of Common Stock or  other property purchasable upon  the exercise
          of each Warrant after  such adjustment, (b) a brief  statement of
          the  facts requiring such  adjustment and (c)  the computation by
          which such  adjustment was  made and  the methods and  underlying
          assumptions utilized.

                    SECTION 10.  Preservation of Purchase Rights upon Merger,
                                 --------------------------------------------
          Consolidation, etc.; Mandatory Redemption of Warrants. (a) In case
          -----------------------------------------------------
          of  any consolidation  or  merger of  the  Company with  or  into
          another person  or in  case  of any  sale, transfer  or lease  to
          another  person of all or  substantially all the  property of the
          Company, the Company and such successor or purchasing person,  as
          the  case may be, shall agree in writing (and such consolidation,
          merger, sale, transfer or lease  shall not be consummated without
          such agreement) that each Registered Holder  shall have the right
          thereafter  upon   payment  of  the  Purchase   Price  in  effect
          immediately prior to such  action to purchase upon exercise  of a
          Warrant  the  kind and  amount  of  securities,  cash  and  other
          property  that it  would  have owned  or  have been  entitled  to
          receive after the happening  of such consolidation, merger, sale,
          transfer or lease   had such  Warrant been exercised  immediately
          prior to  such action (provided  that if the  kind and amount  of
          securities,  cash   and  other  property   receivable  upon  such
          consolidation, merger, sale,  transfer or lease  is not the  same
          for  each  share of  Common Stock  of the  Company, then  for the
          purposes of this paragraph (a) the kind and amount of securities,
          cash and other  property receivable upon exercise of the Warrants
          immediately  after such consolidation,  merger, sale, transfer or
          lease shall be the kind and amount so receivable per share by the
          holders of a majority of the outstanding shares of Common Stock).
          Such written agreement shall  provide for adjustments which shall
          be  as  nearly  equivalent  as  practicable  to  the  adjustments
          provided  for in  Section  8 and  this  paragraph (a)  and  shall
          provide that such adjustments shall similarly apply to successive
          consolidations, mergers, sales, transfers and leases.

                    (b)  Each Registered  Holder shall have  the option  to
          require the Company (or its successor) to redeem all or any  part
          of such Registered Holder's Warrants upon the consummation of any
          consolidation  or merger  of  the Company  with  or into  another
          person or any sale, transfer or lease to another person of all or
          substantially  all  the property  of the  Company.   A Registered
          Holder  may exercise such option by giving to the Company, within
          10  Business Days after  such Registered Holder's  receipt of the
          notice  given by  the Company  pursuant to  Section 18  hereof in
          respect of the consolidation, merger,  sale, transfer or lease in
          question (or, if such notice is not  timely given by the Company,
          at  any time  prior to  such consummation),  a written  notice (a
          "Notice of Exercise") substantially  in the form attached to  the
          Warrant Certificates.

                    From and  after the giving  of any Notice  of Exercise,
          each Warrant  covered thereby  shall represent the  right of  the
          Registered Holder  thereof to  receive from  the Company (or  its
          successor), on the date on which the consolidation, merger, sale,
          transfer  or lease in question is consummated, an amount equal to
          the current market price of such Warrant; provided, however, that 
                                                    -----------------
          the Registered Holder shall have the right to revoke such Notice of


                                      13
     <PAGE>


          Exercise  and instead exercise such Warrant prior to such date in
          lieu  of receiving such amount.   For purposes  of this paragraph
          (b), the current  market price  of each Warrant  shall equal  the
          average of the  daily closing prices  of the Warrants for  the 20
          consecutive trading days ending  on the last full trading  day on
          the exchange or market identified pursuant to the next succeeding
          sentence  prior   to  the   first  public  announcement   of  the
          consolidation, merger, sale, lease or  transfer in question.  The
          closing price of the Warrants for any day shall  be determined in
          the  same manner  as the  closing  price of  the Common  Stock is
          determined under the third  sentence of Section 8(f). If  for any
          reason the daily closing  prices of the Warrants during  such 20-
          trading  day period  cannot  be determined  as  provided in  such
          sentence,  the current market  price of each  Warrant shall equal
          the  average fair  market value for  the 20  consecutive Business
          Days preceding  such first public announcement,  as determined by
          two members  of the NASD selected  in good faith by  the Board of
          Directors of the Company.

                    The nonexercise of the foregoing option with respect to
          any Warrant  in connection with any  consolidation, merger, sale,
          lease  or transfer shall not preclude the exercise of such option
          with  respect to such  Warrant in connection  with any subsequent
          consolidation, merger, sale, lease  or transfer.  In the  case of
          any  consolidation  or merger  in which  the  Company is  not the
          surviving entity  or in the case of  any sale, lease or transfer,
          the  Company shall cause its  successor to agree  in writing (and
          such consolidation, merger, sale, lease or transfer shall  not be
          consummated without such agreement)  that it shall be responsible
          for  the  performance of  the  Company's  obligations under  this
          paragraph (b).

                    SECTION 11.  Statement Concerning Warrant Certificates.
                                 -----------------------------------------
          The Company may, but shall not be obligated to, issue replacement
          Warrant Certificates upon any adjustment to the Purchase Price or
          the number or  kind of  shares purchasable upon  exercise of  the
          Warrants.    Irrespective of  any  such  adjustment, the  Warrant
          Certificates theretofore and thereafter  issued shall, unless the
          Company  shall   exercise  its   option  to  issue   new  Warrant
          Certificates pursuant to this Section 11, continue to express the
          same  Purchase Price  per share,  and the  same number  of shares
          purchasable  thereunder,   as  were  expressed   in  the  Warrant
          Certificates when the same were originally issued.

                    SECTION 12.  Common Stock.  As used in Sections 8, 9, 10 
                                 ------------
          and  11, the  term  "Common Stock"  shall  mean and  include  the
          Company's Common Stock authorized on the Initial Warrant Exercise
          Date and shall also include any capital stock of any class of the
          Company  thereafter authorized  which shall  not be limited  to a
          fixed sum or  percentage in respect of the  rights of the holders
          thereof to participate in dividends and in the distribution of
          assets upon the voluntary liquidation, dissolution or winding up of
          the Company; provided, however, that subject to Sections 8 and 10, 
                       --------  -------
          the shares issuable upon exercise of the Warrants shall include only
          shares of  such class designated in the  Company's  Certificate of
          Incorporation  as Common  Stock on  the Initial  Warrant Exercise
          Date  or  (a) in  the case  of  any consolidation,  merger, sale,
          transfer or lease described in Section  10, the stock, securities
          or property  provided for in such  Section or (b) in  the case of
          any  reclassification  or change  in  the  outstanding shares  of
          Common Stock issuable upon  exercise of the Warrants as  a result


                                      14
     <PAGE>


          of a subdivision or combination or  consisting of a change in par
          value, or from par value to no par value, or from no par value to
          par  value, such  shares of  Common Stock  as so  reclassified or
          changed.   Notwithstanding any other provision  of this Agreement
          to the contrary,  before taking  any action that  would cause  an
          adjustment reducing the Purchase Price below  the then par value,
          if any, of the  shares of Common Stock issuable upon  exercise of
          the  Warrants,  the  Company  shall  take  all  corporate  action
          necessary,  in  the opinion  of its  counsel,  in order  that the
          Company   may  validly   and   legally  issue   fully  paid   and
          nonassessable  shares of  Common Stock  at the  adjusted Purchase
          Price.

                    SECTION 13.  Warrant Expiration Date.  Each Warrant not
                                 -----------------------
          exercised  on or before the Warrant  Expiration Date shall become
          void and all  rights of the Registered Holder  thereof thereunder
          and under this Agreement in respect of such Warrant shall cease.

                    SECTION 14.  Fractional Warrants and Fractional Shares.
                                 -----------------------------------------
          If the number of Warrants or the number of shares of Common Stock
          purchasable  upon  the  exercise  of  each  Warrant  is  adjusted
          pursuant to Section 8  or 10, the Company shall  nevertheless not
          be required to issue fractions of Warrants or fractions of shares
          of Common Stock, upon  exercise of the Warrants or  otherwise, or
          to distribute  certificates that evidence fractional  Warrants or
          fractional  shares of Common Stock.  With respect to any fraction
          of a Warrant called for in the  aggregate Warrant position of any
          Registered Holder upon any adjustment pursuant to Section 8 or 10
          or any fraction  of a share of Common Stock  called for given the
          aggregate  number  of shares  issuable  upon  any exercise  by  a
          Registered Holder of Warrants, such fraction  shall be rounded to
          the nearest whole number (.50 being rounded upward).

                    SECTION 15.  Registered Holders Not Deemed Share-holders.
                                 -------------------------------------------
          No Registered Holder of  Warrants shall, as such, be  entitled to
          vote or  to receive dividends  or be deemed the  holder of Common
          Stock that  may at  any time be  issuable upon  exercise of  such
          Warrants for any purpose whatsoever, nor shall anything contained
          herein  be construed to confer upon the Registered Holders of the
          Warrants, as  such, any  of the  rights of  a shareholder  of the
          Company  or any right  to vote for  the election  of directors or
          upon any matter submitted to shareholders at any meeting thereof,
          or to give or  withhold consent to any corporate  action (whether
          upon any recapitalization,  issue or  reclassification of  stock,
          change  of  par value,  consolidation,  merger  or conveyance  or
          otherwise),  or to  receive  notice of  meetings,  or to  receive
          dividends  or subscription  rights until  such Registered  Holder
          shall have  exercised Warrants in accordance  with the provisions
          hereof. 

                    SECTION 16.  Cancellation of Warrant Certificates.  If 
                                 ------------------------------------
          the Company shall  purchase or acquire  any Warrant or  Warrants,
          the Warrant  Certificate or  Warrant Certificates  evidencing the
          same shall thereupon  be canceled by it and retired.  The Company
          shall also cancel Warrant  Certificates following exercise of any
          or all of the Warrants represented thereby or delivered to it for
          registration of transfer or exchange.

                    SECTION 17.  Rights of Action.  All rights of action with
                                 ----------------
          respect to this Agreement are vested in the respective Registered


                                      15
     <PAGE>


          Holders  of the Warrants, and any Registered Holder of a Warrant,
          without  consent of  the Warrant Agent  or of  the holder  of any
          other Warrant,  may, in his, her  or its own behalf  and for his,
          her  or  its  own  benefit,  enforce  against  the  Company  such
          Registered  Holder's right to  exercise his, her  or its Warrants
          for the purchase of shares of Common Stock in the manner provided
          in the Warrant Certificate and this Agreement.

                    SECTION 18.  Agreement of Warrantholders.  Every holder
                                 ---------------------------
          of a Warrant,  by such holder's acceptance  thereof, consents and
          agrees with the Company, the Warrant Agent and every other holder
          of a Warrant that:

                    (a)  The Warrants are transferable only on the registry
          books  of the Warrant Agent  by the Registered  Holder thereof in
          person or by his, her or its  attorney duly authorized in writing
          and only  if the Warrant Certificates  representing such Warrants
          are surrendered at the office of the Warrant Agent, duly endorsed
          or accompanied by a proper instrument of transfer satisfactory to
          the  Warrant  Agent and  the  Company in  their  sole discretion,
          together with payment of any applicable transfer taxes; and

                    (b)  The  Company and  the Warrant  Agent may  deem and
          treat  the  person  in  whose name  the  Warrant  Certificate  is
          registered as the Registered Holder and as the absolute, true and
          lawful  owner  of  the   Warrants  represented  thereby  for  all
          purposes,  and neither the Company nor the Warrant Agent shall be
          affected  by any notice or  knowledge to the  contrary, except as
          otherwise expressly provided in Section 6 hereof.

                    SECTION 19.  Cancellation of Warrant Certificates.  If 
                                 ------------------------------------
          the Company  shall purchase or  acquire any Warrant  or Warrants,
          the Warrant Certificate or Certificates evidencing the same shall
          thereupon  be delivered to the  Warrant Agent and  canceled by it
          and retired.   The Warrant  Agent shall also  cancel the  Warrant
          Certificates following  exercise of  any or  all of  the Warrants
          represented thereby  or delivered  to it for  transfer, split-up,
          combination or exchange.

                    SECTION 20.  Warrant Agent. (a) Duties and Liabilities.
                                 -------------      ----------------------
          The Warrant  Agent hereby accepts the agency  established by this
          Agreement  and  agrees to  perform the  same  upon the  terms and
          conditions herein set  forth, by all of which the Company and the
          Registered Holders of the  Warrants, by their acceptance thereof,
          shall be bound.   The Warrant Agent shall not,  by countersigning
          Warrant  Certificates or by any other act hereunder, be deemed to
          make  any representations as to  the validity or authorization of
          the  Warrants  or the  Warrant  Certificates  (except as  to  its
          countersignature thereon) or of  any securities or other property
          delivered  upon exercise or repurchase  of any Warrant,  or as to
          the accuracy of the computation of the Purchase Price or exercise
          or  repurchase  of  any  Warrant,   or  the  correctness  of  the
          representations of the Company made in  the certificates that the
          Warrant  Agent  receives.    The  Warrant  Agent  shall   not  be
          accountable  for the  use or  application by  the Company  of the
          proceeds of the exercise of any Warrant.  The Warrant Agent shall
          not  have any duty to calculate or determine any adjustments with
          respect to either the  Purchase Price or  the kind and amount  of
          shares  or  other  securities   or  any  property  receivable  by


                                      16
     <PAGE>


          Registered Holders  upon the  exercise or repurchase  of Warrants
          required from  time to time and  the Warrant Agent shall  have no
          duty or responsibility in determining the accuracy or correctness
          of such  calculation.  The Warrant Agent  shall not be (a) liable
          for any recital or  statement of fact contained herein  or in the
          Warrant Certificates or for any action taken, suffered or omitted
          by it in good faith in the belief that any Warrant Certificate or
          any  other documents or  any signatures  are genuine  or properly
          authorized,  (b) responsible for any  failure on the  part of the
          Company  to comply  with  any of  its  covenants and  obligations
          contained in this Agreement or in the Warrant Certificates or (c)
          liable  for any act or omission in connection with this Agreement
          except for its own  gross negligence or willful misconduct.   The
          Warrant Agent  is hereby  authorized to accept  instructions with
          respect  to  the performance  of  its duties  hereunder  from the
          President, any Vice President or the Secretary or Treasurer or an
          Assistant  Treasurer  of the  Company and  to  apply to  any such
          officer  for instructions  (which instructions  will be  promptly
          given  in writing when requested) and the Warrant Agent shall not
          be liable for any  action taken or suffered to be  taken by it in
          good  faith  in  accordance with  the  instructions  of any  such
          officer; however,  in its discretion,  the Warrant  Agent may  in
          lieu  thereof accept other evidence  of such or  may require such
          further  or additional evidence as  it may deem  reasonable.  The
          Warrant  Agent  shall not  be liable  for  any action  taken with
          respect  to any matter in the event it requests instructions from
          the  Company  as  to  that  matter  and  does  not  receive  such
          instructions within a reasonable period of time after the request
          therefor.

                    The  Warrant Agent may execute and  exercise any of the
          rights  and  powers  hereby vested  in  it  or  perform any  duty
          hereunder either itself or by or through its attorneys, agents or
          employees,  and the  Warrant  Agent shall  not  be answerable  or
          accountable  for any act,  default, neglect or  misconduct of any
          such attorneys, agents or employees, provided reasonable care has
                                               --------
          been exercised in the  selection and in the continued employment
          of any such attorney, agent or employee.  The Warrant Agent shall
          not be under any obligation or duty to institute, appear in or
          defend any action, suit  or legal proceeding  in respect hereof,
          unless first indemnified  to its satisfaction, but  this provision
          shall not affect the power of the Warrant Agent to take such action
          as the Warrant Agent  may consider proper,  whether with or without
          such indemnity.   The  Warrant Agent  shall  promptly notify  the
          Company  in  writing  of  any  claim  made  or  action,  suit  or
          proceeding instituted against it arising out  of or in connection
          with this Agreement.

                    The  Company will  perform,  execute,  acknowledge  and
          deliver  or  cause   to  be  delivered  all   such  further  acts
          instruments and assurances as  are consistent with this Agreement
          and as may reasonably be  required by the Warrant Agent  in order
          to  enable  it to  carry out  or  perform its  duties  under this
          Agreement.

                    The  Warrant Agent  shall  act solely  as agent  of the
          Company  hereunder.  The Warrant Agent shall not be liable except
          for  the failure to perform  such duties as  are specifically set
          forth herein,  and no implied  covenants or obligations  shall be
          read into this Agreement against the Warrant  Agent, whose duties
          and  obligations  shall  be  determined  solely  by  the  express
          provisions hereof.


                                      17
     <PAGE>

                    (b)  Right to Consult Counsel.  The Warrant Agent may at
                         ------------------------
          any time  consult with  legal counsel  acceptable to the  Company
          (who may be  legal counsel for the  Company), and the  opinion or
          advice of such counsel shall  be full and complete  authorization
          and protection to the  Warrant Agent and the Warrant  Agent shall
          incur no liability  or responsibility  to the Company  or to  any
          Registered Holder for any action taken, suffered or omitted by it
          in good  faith in accordance with  the opinion or  advice of such
          counsel.

                    (c)  Compensation; Indemnification.  The Company agrees
                         -----------------------------
          promptly to pay the Warrant Agent from time to time, on demand of
          the Warrant Agent, compensation for its services hereunder as the
          Company and the Warrant Agent may agree from time to time, and to
          reimburse it for reasonable expenses and counsel fees incurred in
          connection  with   the  execution  and   administration  of  this
          Agreement,  and further agrees to indemnify the Warrant Agent and
          save  it harmless  against  any losses,  liabilities or  expenses
          arising  out  of  or  in   connection  with  the  acceptance  and
          administration  of   this  Agreement,  including  the  costs  and
          expenses  of  investigating  or   defending  any  claim  of  such
          liability,  except  that  the  Company shall  have  no  liability
          hereunder  to the extent that any such loss, liability or expense
          results from the Warrant Agent's own  gross negligence or willful
          misconduct.   The obligations of  the Company under  this Section
          shall survive the exercise and the expiration of the Warrants and
          the resignation or removal of the Warrant Agent.

                    (d)  No Restrictions on Actions.  The Warrant Agent and
                         --------------------------
          any  stockholder, director,  officer or  employee of  the Warrant
          Agent  may buy,  sell or  deal in  any of  the Warrants  or other
          securities  of the  Company or  become pecuniarily  interested in
          transactions  in which the Company may be interested, or contract
          with  or lend money to the Company  or otherwise act as fully and
          freely  as  though  it were  not  the  Warrant  Agent under  this
          Agreement.  Nothing herein shall preclude the  Warrant Agent from
          acting  in any  other capacity for  the Company or  for any other
          legal entity.

                    (e)  Discharge or Removal; Replacement Warrant Agent.  
                         -----------------------------------------------
          The Warrant  Agent may resign  from its position  as such and  be
          discharged  from all  further  duties  and liabilities  hereunder
          (except  liability arising as a result of the Warrant Agent's own
          gross negligence or willful misconduct), after giving one month's
          prior written notice to the Company.  The Company may remove  the
          Warrant Agent upon one month's written notice specifying the date
          when  such  discharge from  all  further  duties and  liabilities
          hereunder, except as aforesaid.  The Warrant Agent or the Company
          shall cause to be mailed to each Registered Holder of a Warrant a
          copy of  said notice of resignation or  notice of removal, as the
          case  may be.  Upon such resignation or removal the Company shall
          appoint in  writing a  new warrant agent.   If the  Company shall
          fail to make such appointment within a period of 30 calendar days
          after it has been notified in writing  of such resignation by the
          resigning Warrant Agent or after such removal, then the resigning
          Warrant Agent or the  Registered Holder of any Warrant  may apply
          to any court of  competent jurisdiction for the appointment  of a
          new warrant agent.   Pending  appointment of a  successor to  the
          original Warrant Agent, either by the Company or by such a court,
          the duties  of  the Warrant  Agent shall  be carried  out by  the
          Company.  Any new warrant agent, whether appointed by the Company


                                      18
     <PAGE>


          or  by  such a  court, shall  be a  bank  or trust  company doing
          business  under  the  laws of  the  United  States  or any  state
          thereof,  in good  standing  and having  a  combined capital  and
          surplus of not less  than $25,000,000.  The combined  capital and
          surplus  of any such new warrant agent  shall be deemed to be the
          combined  capital and  surplus as  set froth  in the  most recent
          annual  report of its  condition published by  such warrant agent
          prior to its appointment, provided that such reports are published
                                    --------
          at  least  annually   pursuant  to  law  or   the  requirements of
          a federal  or  state  supervising or  examining authority.   After
          acceptance in  writing of such  appointment by the new warrant
          agent, it shall  be vested with the same  powers, rights, duties
          and responsibilities as if  it had been originally named herein
          as the Warrant Agent, without any further assurance, conveyance,
          act or  deed;  however, the  original Warrant  Agent shall in all
          events deliver and transfer to the successor Warrant Agent  all
          property,  if any, at  the time held  hereunder by the original
          Warrant Agent  and  if  for  any  reason  it  shall  be necessary
          or  expedient  to  execute  and  deliver  any  further assurance,
          conveyance, act or deed, the same shall be done at the expense  of
          the Company and shall be legally and validly executed and delivered
          by  the resigning  or removed Warrant  Agent.   Not later than the
          effective  date  of any  such  appointment,  the Company shall file
          notice thereof with the resigning  or removed Warrant Agent and
          shall forthwith cause a  copy of such notice to be mailed  to
          each Registered  Holder of a  Warrant.   Failure to give any
          notice provided  for in this paragraph (e),  however, or any
          defect therein, shall not affect the legality or validity of
          the resignation of the  Warrant Agent or the appointment of a
          new  warrant agent, as the case may be.

                    (f)  Successor Warrant Agent.  Any corporation into which
                         -----------------------
          the Warrant Agent or any new warrant agent may be  merged, or any
          corporation resulting from any consolidation to which the Warrant
          Agent  or any  new warrant  agent shall  be a  party, shall  be a
          successor Warrant Agent under  this Agreement without any further
          act, provided that such corporation would be eligible for 
               --------
          appointment  as   successor  to  the  Warrant   Agent  under  the
          provisions of  paragraph (e) above.   Any such  successor Warrant
          Agent shall  promptly cause  notice of it  succession as  Warrant
          Agent to be mailed to each Registered Holder of a Warrant.

                    SECTION 21.  Waivers; Amendments.  No failure or delay of
                                 -------------------
          the Registered Holders or any of them in exercising  any right or
          power under this  Agreement or  the Warrants shall  operate as  a
          waiver thereof, nor shall  any single or partial exercise  of any
          such  right or  power,  or any  abandonment or  discontinuance of
          steps to  enforce such  a right  or power  preclude any  other or
          further  exercise thereof or the  exercise of any  other right or
          power.  The  rights and  remedies of the  Registered Holders  are
          cumulative  and not exclusive of any rights or remedies that they
          would otherwise have.  The Warrant  Agent and the Company may  by
          supplemental agreement  make any  changes or corrections  in this
          Agreement  (a)  that they  shall  deem  appropriate to  cure  any
          ambiguity or to correct  any defective or inconsistent provisions
          or manifest mistake or  error herein contained; or (b)  that they
          may deem  necessary or  desirable and which  shall not  adversely
          affect the interests  of the holders of UNS Warrant Certificates;
          provided, however, that this Agreement shall not otherwise be
          --------  -------
          amended,  modified  or waived  except with the consent  in writing
          of the Company and the Registered Holders of Warrant  Certificates


                                      19
     <PAGE>


          representing more than 50% of the Warrants then  outstanding; and
          provided, further, that no change in the number or kind of the
          -----------------
          securities purchasable upon  the exercise of any  Warrant, or the
          Purchase Price, or the Warrant Expiration Date, and no amendment,
          waiver or modification of the provisions of this Section 18 or of
          Section 8 or 10, shall be made without the written consent of the
          Registered Holders  of all Warrants then  outstanding, other than
          such  adjustments  as  are  contemplated  by  the  provisions  of
          Sections 8 and 10.

                    In  the event  of any  such amendment,  modification or
          waiver, the Warrant Agent shall give prompt notice thereof to all
          Registered Holders and, if appropriate, notation thereof shall be
          made on  all  Warrant  Certificates  thereafter  surrendered  for
          registration of transfer or exchange.

                    No  notice or demand on  the Company in  any case shall
          entitle the Company  to any other  or future notice or  demand in
          similar or other circumstances.

                    SECTION 22. Notice of Certain Events. In case at any time:
                                ------------------------
          
                    (a)  the Company  shall pay any dividend upon,  or make
               any distribution in respect of, its  Common Stock that would
               give rise to an adjustment pursuant to Section 8(e);

                    (b)  the   Company  shall  offer  for  subscription  to
               holders of its  Common Stock any additional  shares of stock
               of any class or other rights;

                    (c)  there  shall  be  any capital  reorganization,  or
               reclassification  of the  capital stock  of the  Company, or
               consolidation  or  merger of  the Company  with or  into, or
               sale, transfer or lease  of all or substantially all  of its
               property to, another entity; or

                    (d)  there   shall  be   a  voluntary   or  involuntary
               dissolution, liquidation or winding up of the Company;

          then, in  any one or more  of said cases, the  Company shall give
          notice to the  Warrant Agent,  and the Warrant  Agent shall  give
          notice to  the Registered Holders,  of the date on  which (i) the
          books of the  Company shall close or a record  shall be taken for
          such dividend,  distribution or subscription rights  or (ii) such
          reorganization,  reclassification,  consolidation, merger,  sale,
          transfer,  lease,  dissolution, liquidation  or winding  up shall
          take place,  as  the case  may  be.   Such notice  to  Registered
          Holders shall be given not less than 10 days prior  to the record
          date  or the date  on which  the books of  the Company  are to be
          closed in respect thereto in the  case of an action specified  in
          clause  (i) and at least 20 days  prior to the action in question
          (or as  soon as the Company  has knowledge of the  action) in the
          case of an action specified in clause (ii).


                                      20
     <PAGE>

                    SECTION 23.  Notices.  All notices, requests, consents 
                                 -------
          and other communications hereunder shall be in writing and  shall
          be deemed to have been made when delivered or mailed first class,
          registered  or certified  mail, postage  prepaid to  a Registered
          Holder at  the address of  such holder as  shown on the  registry
          books maintained by the Company and to the Company or the Warrant
          Agent, as follows:

               To the Company:

                         Tucson Electric Power Company
                         220 West Sixth Street
                         Tucson, Arizona 85702
                         Attention: Treasurer

               To the Warrant Agent:

                         The Bank of New York
                         P.O. Box 11002
                         Church Street Station
                         New York, New York 10286-1281


          or at such other address as  may have been furnished to the party
          giving or making such notice in writing.

                    SECTION 24.  Governing Law.  This Agreement shall be 
                                 -------------
          governed  by and  construed in  accordance with  the laws  of the
          State of  Arizona, without reference to principles of conflict of
          laws.

                    SECTION 25.  Binding Effect.  This Agreement shall be 
                                 --------------
          binding  upon and inure  to the  benefit of  the Company  and its
          successors and assigns,  and the Registered Holders  from time to
          time  of Warrant Certificates.   Each  Registered Holder,  by its
          acceptance  of a Warrant Certificate,  agrees to be  bound by the
          provisions  of this  Agreement  as if  it  were a  party  hereto.
          Nothing  in this Agreement is  intended or shall  be construed to
          confer  upon  any other  person any  right,  remedy or  claim, in
          equity or  at law or  to impose upon  any other person  any duty,
          liability or obligation.

                    SECTION 26.  Severability.  In case any one or more of 
                                 ------------
          the  provisions  contained  in  this  Agreement  or  the  Warrant
          Certificates  issued  hereunder  shall  be  invalid,  illegal  or
          unenforceable  in   any  respect,  the   validity,  legality  and
          enforceability of  the remaining provisions contained  herein and
          therein shall not  in any  way be affected  or impaired  thereby.
          The  parties shall endeavor in good faith negotiations to replace
          the  invalid, illegal  or  unenforceable  provisions  with  valid
          provisions  the  economic  effect  of which  comes  as  close  as
          possible  to  that  of  the  invalid,  illegal  or  unenforceable
          provisions.


                                      21
      <PAGE>

                    SECTION 27.  Counterparts.  This Agreement may be 
                                 ------------
          executed  in  several  counterparts, which  taken  together shall
          constitute a single document.


                                      22
     <PAGE>


                    IN WITNESS WHEREOF, the parties hereto have caused this
          Agreement to be duly executed as of the date first above written.

                                        UNISOURCE ENERGY CORPORATION,


                                        by  
                                            ------------------------------
                                             Name:
                                             Title:


                                        THE BANK OF NEW YORK, 
                                         as Warrant Agent


                                        by  
                                            ------------------------------
                                             Name:
                                             Title:


                                      23
     <PAGE>

                                                                  EXHIBIT A


                        [Form of 1999 UNS Warrant Certificate]
                        --------------------------------------

          No. W      - 1999                                        Warrants
               ------                                     --------

                                 Warrant Certificate
                                 -------------------


                             UNISOURCE ENERGY CORPORATION

                    THIS CERTIFIES THAT                                , or
          its registered assigns, is  the registered owner (the "Registered
          Holder") of the number of Warrants set forth above, each of which
          entitles  the owner  thereof  to purchase  from UniSource  Energy
          Corporation  (the  "Company')  at any  time  prior  to  4:00 p.m.
          (Tucson, Arizona time) on March 15, 1999, at the principal office
          of  the Company, at 220 West Sixth Street, Tucson, Arizona 85702,
          one  fully paid  and  nonassessable share  of  the Common  Stock,
          without  par value ("Common Stock"), of the Company at a purchase
          price   of  $16.00   per  share   (the  "Purchase   Price")  upon
          presentation and  surrender of this Warrant  Certificate with the
          Form of Election to Purchase duly executed, together with payment
          in cash, or  by official bank or certified check  made payable to
          the Company, or by wire transfer, of an amount in lawful money of
          the United  States of  America equal  to the  applicable Purchase
          Price.    The  number  of  Warrants  evidenced  by  this  Warrant
          Certificate (and the number of shares of Common Stock that may be
          purchased  upon  exercise  thereof)  set  forth  above,  and  the
          Purchase  Price per  share set  forth above,  are the  number and
          Purchase Price as of          , 1999, based on the shares of 
                               ---------
          Common  Stock as  constituted at such  date.  As  provided in the
          Warrant  Agreement  referred  to  below, upon  the  happening  of
          certain events, (a) the  Purchase Price and the number  of shares
          of  Common Stock that  may be purchased upon  the exercise of the
          Warrants  evidenced by  this Warrant  Certificate are  subject to
          modification  and adjustment and (b) the registered holder of the
          Warrants evidenced  by this  Warrant Certificate may  require the
          redemption thereof.

                    This Warrant Certificate is subject to all of the terms
          and conditions of a Warrant Agreement dated as of        , 1998 
                                                            -------
          (the "Warrant Agreement"), between the Company and the Warrant
          Agent.  The Warrant Agreement is hereby incorporated herein by
          reference and made a part hereof.  Reference is hereby made to
          the Warrant Agreement for a full description of the rights,
          limitations of rights, obligations, duties and immunities
          thereunder of the Company and the registered holders of the
          Warrant Certificates.  Copies of the Warrant Agreement are on
          file at the office of the Company referred to above.

                    This Warrant Certificate, with or without other Warrant
          Certificates, upon surrender at the office of the Warrant Agent,
          may be exchanged for another Warrant Certificate or Warrant
          Certificates evidencing Warrants entitling the Registered Holder


                                      A-1
     <PAGE>


          to purchase a like aggregate number of shares of Common Stock as
          the Warrants evidenced by the Warrant Certificate or Warrant
          Certificates surrendered shall have entitled the Registered
          Holder to purchase.  If this Warrant Certificate shall be
          exercised or redeemed in part, the Registered Holder shall be
          entitled to receive upon surrender hereof another Warrant
          Certificate or Warrant Certificates for the number of whole
          Warrants not exercised.

                    If the Warrants evidenced by this Warrant Certificate
          remain unexercised or unredeemed at the expiration of the period
          during which Warrants are exercisable, as set forth in the first
          paragraph hereof, such Warrants shall thereupon become void and
          all rights of the Registered Holder hereunder and under the
          Warrant Agreement in respect of such Warrants shall cease.

                    No fractional Warrants will be issued upon any
          adjustment pursuant to Section 8 or 10 of the Warrant Agreement
          and no fractional shares of Common Stock will be issued upon the
          exercise of any Warrant or Warrants evidenced hereby.  With
          respect to any fraction of a Warrant called for in the aggregate
          Warrant position of the Registered Holder upon any adjustment
          pursuant to Section 8 or 10 of the Warrant Agreement or any
          fraction of a share of Common Stock called for given the
          aggregate number of shares issuable upon any exercise by the
          Registered Holder of Warrants, such fraction shall be rounded to
          the nearest whole number (.50 being rounded upward).

                    Until the Warrant or Warrants evidenced by this Warrant
          Certificate are exercised as provided in the Warrant Agreement,
          no Registered Holder of this Warrant Certificate, as such, shall
          be entitled to vote or receive dividends or be deemed for any
          purpose the holder of Common Stock or of any other securities of
          the Company that may at any time be issuable on the exercise
          hereof, nor shall anything contained in the Warrant Agreement or
          herein be construed to confer upon the Registered Holder hereof,
          as such, any of the rights of a shareholder of the Company or any
          right to vote upon any matter submitted to shareholders at any
          meeting thereof, or to give or withhold consent to any corporate
          action (whether upon any recapitalization, issue of stock,
          reclassification of stock, change of par value, consolidation,
          merger, conveyance, or otherwise) or, except as provided in the
          Warrant Agreement, to receive notice of meetings, or to receive
          dividends or subscription rights or otherwise.


                                      A-2
     <PAGE>

                    This Warrant Certificate shall not be valid for any
          purpose until it shall have been countersigned by the Warrant
          Agent.


          Dated as of


                                        UNISOURCE ENERGY CORPORATION 


                                        by 
                                           --------------------------
                                             Name:
                                             Title: 

          Countersigned:


          THE BANK OF NEW YORK
            as Warrant Agent



          by:
               -------------------
          Name:
          Title:


                                      A-3
     <PAGE>


                                      ASSIGNMENT


                    (To be executed by the Registered Holder if such
                    Registered Holder desires to register the transfer of
                    the Warrant Certificate.)


          FOR VALUE RECEIVED,                           hereby sells, 
                              -------------------------
          assigns and transfers unto                           this Warrant
                                     -------------------------
          Certificate, together with all right, title and interest therein,
          and does hereby irrevocably constitute and appoint 
                                                             -----------
          Attorney to transfer this Warrant Certificate on the books of the
          Warrant Agent with full power of substitution.

          Dated:                     .
                 --------------------

          Signature:
                                        ----------------------------

          Signature Guaranteed:
                                        ----------------------------


                                        NOTICE

                    The signature on the foregoing Assignment must conform
          in all respects to the name of the Registered Holder as specified
          on the face of this Warrant Certificate.


                                      A-4
     <PAGE>

                                 ELECTION TO PURCHASE


                    (To be executed if the Registered Holder desires to
                    exercise any 1999 UNS Warrant represented by this
                    Warrant Certificate.)


          TO:  UNISOURCE ENERGY CORPORATION

                    The undersigned hereby irrevocably elects to exercise
                                     1999 UNS Warrants represented by this
          --------------------------
          Warrant Certificate to purchase the shares of Common Stock
          issuable upon the exercise of such number of Warrants and
          requests that certificates for such shares be issued in the name
          of:



          ----------------------------------------------------------------
                      (Print name, address and social security 
                             or other identifying number)

          and in the following denominations:



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


          Dated:              .
                  ------------


          Signature:
                                        ------------------------------
                                        (Signature must conform in all
                                        respects to the name of the
                                        Registered Holder as specified on
                                        the face of this Warrant
                                        Certificate)




          Signature Guaranteed:
                                        ------------------------------


                                      A-5
     <PAGE>

                                  NOTICE OF EXERCISE


                    (To be executed if the Registered Holder desires to
                    have redeemed any 1999 UNS Warrant represented by this
                    Warrant Certificate.)


          TO:  UNISOURCE ENERGY CORPORATION

                    The undersigned hereby elects to have redeemed 
                                                                   ------
          Warrants represented by this Warrant Certificate and requests
          that the redemption price for such Warrants be paid to:




          ----------------------------------------------------------------
                      (Print name, address and social security 
                             or other identifying number)

                    The undersigned has the right to revoke this Notice of
          Exercise as provided in Section 10(b) of the Warrant Agreement.




          Dated:              .
                  ------------



          Signature:


                                        ------------------------------
                                        (Signature must conform in all
                                        respects to the name of the
                                        Registered Holder as specified on
                                        the face of this Warrant
                                        Certificate)




          Signature Guaranteed:
                                        ------------------------------


                                      A-6
     <PAGE>

                                                                  EXHIBIT B


                        [Form of 2000 UNS Warrant Certificate]
                        --------------------------------------

          No. W      - 2000                                        Warrants
               ------                                     --------

                                 Warrant Certificate
                                 -------------------


                             UNISOURCE ENERGY CORPORATION

                    THIS CERTIFIES THAT                             , or
          its registered assigns, is the registered owner (the "Registered
          Holder") of the number of Warrants set forth above, each of which
          entitles the owner thereof to purchase from UniSource Energy
          Corporation (the "Company') at any time prior to 4:00 p.m.
          (Tucson, Arizona time) on December 15, 2000, at the principal
          office of the Company, at 220 West Sixth Street, Tucson, Arizona
          85702, one fully paid and nonassessable share of the Common
          Stock, without par value ("Common Stock"), of the Company at a
          purchase price of $16.00 per share (the "Purchase Price") upon
          presentation and surrender of this Warrant Certificate with the
          Form of Election to Purchase duly executed, together with payment
          in cash, or by official bank or certified check made payable to
          the Company, or by wire transfer, of an amount in lawful money of
          the United States of America equal to the applicable Purchase
          Price.  The number of Warrants evidenced by this Warrant
          Certificate (and the number of shares of Common Stock that may be
          purchased upon exercise thereof) set forth above, and the
          Purchase Price per share set forth above, are the number and
          Purchase Price as of          , 2000, based on the shares of 
                               ---------
          Common Stock as constituted at such date.  As provided in the
          Warrant Agreement referred to below, upon the happening of
          certain events, (a) the Purchase Price and the number of shares
          of Common Stock that may be purchased upon the exercise of the
          Warrants evidenced by this Warrant Certificate are subject to
          modification and adjustment and (b) the registered holder of the
          Warrants evidenced by this Warrant Certificate may require the
          redemption thereof.

                    This Warrant Certificate is subject to all of the terms
          and conditions of a Warrant Agreement dated as of          , 1998
                                                            ---------
          (the "Warrant Agreement"), between the Company and the Warrant
          Agent.  The Warrant Agreement is hereby incorporated herein by
          reference and made a part hereof.  Reference is hereby made to
          the Warrant Agreement for a full description of the rights,
          limitations of rights, obligations, duties and immunities
          thereunder of the Company and the registered holders of the
          Warrant Certificates.  Copies of the Warrant Agreement are on
          file at the office of the Company referred to above.

                    This Warrant Certificate, with or without other Warrant
          Certificates, upon surrender at the office of the Warrant Agent,
          may be exchanged for another Warrant Certificate or Warrant
          Certificates evidencing Warrants entitling the Registered Holder


                                      B-1
     <PAGE>


          to purchase a like aggregate number of shares of Common Stock as
          the Warrants evidenced by the Warrant Certificate or Warrant
          Certificates surrendered shall have entitled the Registered
          Holder to purchase.  If this Warrant Certificate shall be
          exercised or redeemed in part, the Registered Holder shall be
          entitled to receive upon surrender hereof another Warrant
          Certificate or Warrant Certificates for the number of whole
          Warrants not exercised.

                    If the Warrants evidenced by this Warrant Certificate
          remain unexercised or unredeemed at the expiration of the period
          during which Warrants are exercisable, as set forth in the first
          paragraph hereof, such Warrants shall thereupon become void and
          all rights of the Registered Holder hereunder and under the
          Warrant Agreement in respect of such Warrants shall cease.

                    No fractional Warrants will be issued upon any
          adjustment pursuant to Section 8 or 10 of the Warrant Agreement
          and no fractional shares of Common Stock will be issued upon the
          exercise of any Warrant or Warrants evidenced hereby.  With
          respect to any fraction of a Warrant called for in the aggregate
          Warrant position of the Registered Holder upon any adjustment
          pursuant to Section 8 or 10 of the Warrant Agreement or any
          fraction of a share of Common Stock called for given the
          aggregate number of shares issuable upon any exercise by the
          Registered Holder of Warrants, such fraction shall be rounded to
          the nearest whole number (.50 being rounded upward).

                    Until the Warrant or Warrants evidenced by this Warrant
          Certificate are exercised as provided in the Warrant Agreement,
          no Registered Holder of this Warrant Certificate, as such, shall
          be entitled to vote or receive dividends or be deemed for any
          purpose the holder of Common Stock or of any other securities of
          the Company that may at any time be issuable on the exercise
          hereof, nor shall anything contained in the Warrant Agreement or
          herein be construed to confer upon the Registered Holder hereof,
          as such, any of the rights of a shareholder of the Company or any
          right to vote upon any matter submitted to shareholders at any
          meeting thereof, or to give or withhold consent to any corporate
          action (whether upon any recapitalization, issue of stock,
          reclassification of stock, change of par value, consolidation,
          merger, conveyance, or otherwise) or, except as provided in the
          Warrant Agreement, to receive notice of meetings, or to receive
          dividends or subscription rights or otherwise.


                                      B-2
     <PAGE>

                    This Warrant Certificate shall not be valid for any
          purpose until it shall have been countersigned by the Warrant
          Agent.


          Dated as of


                                        UNISOURCE ENERGY CORPORATION 


                                        by 
                                           --------------------------
                                             Name:
                                             Title: 

          Countersigned:


          THE BANK OF NEW YORK
            as Warrant Agent



          by:
               -------------------
          Name:
          Title:


                                      B-3
     <PAGE>

                                      ASSIGNMENT


                    (To be executed by the Registered Holder if such
                    Registered Holder desires to register the transfer of
                    the Warrant Certificate.)


          FOR VALUE RECEIVED,                           hereby sells, 
                              -------------------------
          assigns and transfers unto                           this Warrant
                                     -------------------------
          Certificate, together with all right, title and interest therein,
          and does hereby irrevocably constitute and appoint 
                                                             -----------
          Attorney to transfer this Warrant Certificate on the books of the
          Warrant Agent with full power of substitution.

          Dated:                     .
                 --------------------

          Signature:
                                        ----------------------------

          Signature Guaranteed:
                                        ----------------------------


                                        NOTICE

                    The signature on the foregoing Assignment must conform
          in all respects to the name of the Registered Holder as specified
          on the face of this Warrant Certificate.



                                      B-4
     <PAGE>

                                 ELECTION TO PURCHASE


                    (To be executed if the Registered Holder desires to
                    exercise any 2000 UNS Warrant represented by this
                    Warrant Certificate.)


          TO:  UNISOURCE ENERGY CORPORATION

                    The undersigned hereby irrevocably elects to exercise
                                      2000 UNS Warrants represented by this
          ---------------------------
          Warrant Certificate to purchase the shares of Common Stock
          issuable upon the exercise of such number of Warrants and
          requests that certificates for such shares be issued in the name
          of:



          ----------------------------------------------------------------
                      (Print name, address and social security 
                             or other identifying number)

          and in the following denominations:


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



          Dated:              .
                  ------------


          Signature:
                                        ------------------------------
                                        (Signature must conform in all
                                        respects to the name of the
                                        Registered Holder as specified on
                                        the face of this Warrant
                                        Certificate)




          Signature Guaranteed:
                                        ------------------------------



                                      B-5
     <PAGE>
                                  NOTICE OF EXERCISE


                    (To be executed if the Registered Holder desires to
                    have redeemed any 2000 UNS Warrant represented by this
                    Warrant Certificate.)


          TO:  UNISOURCE ENERGY CORPORATION

                    The undersigned hereby elects to have redeemed 
                                                                   ------
          Warrants represented by this Warrant Certificate and requests
          that the redemption price for such Warrants be paid to:




          ----------------------------------------------------------------
                      (Print name, address and social security 
                             or other identifying number)

                    The undersigned has the right to revoke this Notice of
          Exercise as provided in Section 10(b) of the Warrant Agreement.




          Dated:              .
                  ------------


          Signature:
                                        ------------------------------
                                        (Signature must conform in all
                                        respects to the name of the
                                        Registered Holder as specified on
                                        the face of this Warrant
                                        Certificate)




          Signature Guaranteed:
                                        ------------------------------


                                      B-6





     <PAGE>

                                                           APPENDIX B
          Deletions appear in bracketted text.
          Additions appear as double underlined text.


                                   WARRANT AGREEMENT dated as of [December
                         15, 1992]       , 1998, by and between [TUCSON 
                                  -------
                                  =============  
                         ELECTRIC POWER COMPANY] UNISOURCE ENERGY 
                                                 ================
                         CORPORATION, an Arizona corporation (the 
                         ===========
                         "Company"), and [the Registered Holders (as herein 
                          defined).]  THE BANK OF NEW YORK, as warrant 
                                      ================================
                         agent (in such capacity, the "Warrant Agent").
                         ==============================================


                                     WITNESSETH:

                    [Subject to the terms and conditions set forth below,
          the] WHEREAS, the Company [shall issue an aggregate of 12,054,278
               ============
          Common Stock Purchase Warrants (the "Warrants") to the Registered
          Holders. Each Warrant shall represent the right to ]plans to make
                                                              =============
          an offer (the "Exchange Offer") to the holders of any and all 
          ==============================================================
          warrants to purchase shares of common stock of Tucson Electric 
          ===============================================================
          Power Company ("TEP"), an Arizona corporation and wholly owned 
          ===============================================================
          subsidiary of the Company (the "TEP Warrants"), to exchange each
          =================================================================
          of their TEP Warrants for warrants expiring in 1999 to purchase 
          ======================================================
          [from] shares of common stock of the Company (the "1999 UNS 
                 =====================================================
          Warrants") and warrants expiring in 2000 to purchase shares of 
          ===============================================================
          common stock of the Company (the "2000 UNS Warrants" and, 
          ==========================================================
          together with the 1999 UNS Warrants, the "Warrants"); and
          =========================================================

                    WHEREAS, the Company desires the Warrant Agent to act 
                    ======================================================
          on behalf of the Company, [at an initial price of $3.20, one 
          =========
          share of the Company's Common Stock, no par value per share,
          subject to adjustment under certain circumstances.] and the 
                                                              ========
          Warrant Agent is willing to so act, in connection with the 
          ===========================================================
          issuance, registration, transfer, exchange and redemption of the
          =================================================================
          Warrants, the issuance of certificates representing the Warrants,
          =================================================================
          the exercise of the Warrants, and the rights of the holders 
          ============================================================
          thereof.
          ========

                    [The Company and the Registered Holders] NOW, 
                                                             =====
          THEREFORE, in consideration of the foregoing, the parties hereto
          =================================================================
          hereby agree as follows:
          ======

                    SECTION 1.  Definitions.  As used herein, the following
                                -----------
          terms shall have the following meanings:

                    (a)  "Common Stock" shall mean stock of the Company of
          any class, whether now or hereafter authorized, which has the
          right to participate in the distribution of earnings and assets
          of the Company without limit as to amount or percentage, which at
          the date hereof consists of [160,723,700] 75,000,000 shares of 
                                                    ==========
          Common Stock, without par value.

                    (b)  "Corporate Office" shall mean, at any time, the 
          office of the [Company ]Warrant Agent at which its principal  
                                  =============


     <PAGE>


          [corporate trust] business shall be administered, which office is
          =================
          located at the date hereof at [220 West Sixth Street, Tucson,
          Arizona 85701.]                         , New York, New York 
                         -------------------------
                         ==============================================
          10286].
          =======

                    (c)  "Exercise Date" shall mean, as to each Warrant,
          the date on which the [Company] Warrant Agent shall have received
                                          =============
          both (i) the Warrant Certificate representing such Warrant, with
          a written notice, in substantially the form of the Election to
          Purchase set forth in [Exhibit ]Exhibits A and B hereto, which 
                                          ==============
          notice shall be completed and duly executed by the Registered
          Holder thereof or his attorney duly authorized in writing, and
          (ii) payment in cash, or by official bank or certified check made
          payable to the Company, or by wire transfer, of an amount in
          lawful money of the United States of America equal to the
          applicable Purchase Price.

                    (d)  "Initial Warrant Exercise Date" shall mean, as to
          each Warrant, the date of issuance of such Warrant.

                    (e)  "NASD" shall mean The National Association of
          Securities Dealers, Inc.

                    (f)  "NASDAQ" shall mean The National Association of
          Securities Dealers, Inc. Automated Quotation System.

          [(g) "Participation Agreement" shall mean the Participation
          Agreement dated as of June 30, 1992, among the Company, the owner
          participants and loan participants listed in Schedule I thereto,
          Wilmington Trust Company, as owner trustee, and LaSalle National
          Bank, as indenture trustee, as the same may be amended modified
          or supplemented from time to time.]

                    [(h)](g)  "Purchase Price" shall mean the purchase 
                         ===
          price per share of Common Stock to be paid upon exercise of each
          Warrant in accordance with the terms hereof, which price shall
          initially be [$3.20] $16.00 per share, subject to adjustment from
                               ======
          time to time pursuant to the provisions of Sections 8 and 10
          hereof.

                    [(i)](h)  "Registered Holder" shall mean each person in
                         ===
          whose name any certificate representing Warrants shall be
          registered from time to time on the books maintained by the[ 
          Company] Warrant Agent pursuant to Section 6 hereof.
                   =============

                    [Initially, the Registered Holders shall be those
          parties appearing on the signature pages hereof (other than the
          Company).]

          [(j)](i)  "Transfer Agent" shall mean [the Company acting as its  
               ===
          own] The Bank of New York, as the Company's transfer agent, or
               ======================================
          [such other transfer agent hereafter appointed by the Company.]
          its authorized successor, as such.
          ==================================


                                      2
     <PAGE>

                    (j)  "Warrant Certificates" shall mean, collectively, 
                    ===  =================================================
          warrant certificates for the 1999 UNS Warrants (the "1999 UNS 
          ==============================================================
          Warrant Certificates") and warrant certificates for the 2000 UNS
          =================================================================
          Warrants (the "2000 UNS Warrant Certificates").
          ===============================================

                    (k)  "Warrant Expiration Date" shall mean (i) with 
                                                              =========
          respect to the 1999 UNS Warrants, 4:00 p.m. (Tucson, Arizona 
          =================================
          time) on [              , 2002] March 15, 1999, and (ii) with 
                    --------------        ==============================
          respect to the 2000 UNS Warrants, 4:00 p.m. (Tucson, Arizona 
          =============================================================
          time) on December 15, 2000; provided that if either such date 
          ==========================                   ======
          shall in the State of Arizona or the State of New York be a
          holiday or a day on which banks are required or authorized to be
          closed, then 4:00 p.m. (Tucson, Arizona time) on the next
          following day which in the State of Arizona and the State of New
          York is not a holiday or a day on which banks are required or
          authorized to be closed.

                    SECTION 2.  Warrants and Issuance of Warrant 
                                ---------------------------------
          Certificates. (a)  Each Warrant shall initially represent the 
          ------------
          right to purchase from the Company, subject to the conditions
          contained herein and in the related Warrant Certificate, one
          share of Common Stock upon the exercise thereof, subject to
          adjustment from time to time pursuant to the provisions of
          Sections 8 and 10 hereof.

                    (b)  Upon execution of this Agreement, Warrant
          Certificates representing an aggregate of [12,054,278]      1999
                                                                -----
                                                                ===========
          UNS Warrants and       2000 UNS Warrants shall be (i) executed on
                           -----
          ===============================
          behalf of the Company in accordance with Section 3 and (ii)
          issued and delivered to the [Registered Holders appearing on
          Exhibit A in the respective amounts indicated beside their
          names.] Warrant Agent.  Upon written order of the Company signed
                  =========================================================
          by its President or any Vice President and by its Secretary or an
          =================================================================
          Assistant Secretary, the Warrant Certificates shall be 
          =======================================================
          countersigned, issued and delivered by the Warrant Agent.
          =========================================================

                    (c)  From time to time, up to the Warrant Expiration 
                    ===  ================================================
          Date, the Transfer Agent shall countersign and deliver stock 
          =============================================================
          certificates in required whole number denominations representing
          =================================================================
          one share of Common Stock for each Warrant exercised, subject to
          =================================================================
          adjustment as described herein, upon the exercise of Warrants in
          =================================================================
          accordance with this Agreement.
          ===============================

                    [(c)](d)  From time to time through the Warrant 
                         ===
          Expiration Date, the [Company ]Warrant Agent shall [issue]  
                                         =============
          countersign and deliver Warrant Certificates to the persons 
          ===========
          entitled thereto in connection with any registration of transfer
          or exchange permitted under this Agreement; provided that no
          Warrant Certificates shall be issued except (i) those issued
          pursuant to Section 2(b), (ii) those issued on or after the
          Initial Warrant Exercise Date, upon the exercise of fewer than
          all Warrants represented by any Warrant Certificate, to evidence
          any unexercised Warrants held by the exercising Registered
          Holder, (iii) those issued upon any registration of transfer or
          exchange pursuant to Section 6, (iv) those issued in replacement
          of lost, stolen, destroyed or mutilated Warrant Certificates
          pursuant to Section 7 and (v) at the option of the Company, in
          such form as may be approved by its Board of Directors, to
          reflect any adjustment made pursuant to Section 8 or 10 hereof.


                                      3
     <PAGE>

                    SECTION 3.  Form and Execution of Warrant Certificates.
                                ------------------------------------------
           The 1999 UNS Warrant Certificates shall be substantially in the  
               ========
          form annexed hereto as Exhibit A and the 2000 UNS Warrant 
                                         ===========================
          Certificates shall be substantially in the form annexed hereto as
          =================================================================
          Exhibit B, and such Warrant Certificates may have such letters, 
          =======  =     =========================
          numbers or other marks of identification or designation and such
          legends, summaries or endorsements printed, lithographed or
          engraved thereon as the Company may deem appropriate and as are
          not inconsistent with the provisions of this Agreement [or the
          Participation Agreement], or as may be required to comply with
          any law or with any rule or regulation made pursuant thereto or
          with any rule or regulation of any stock exchange on which the
          Warrants may be listed, or to conform to usage.  Each Warrant
          Certificate shall be dated the date of issuance thereof (whether
          upon initial issuance, registration of transfer, exchange or
          replacement) and issued in registered form.  Warrant Certificates
          shall be numbered serially with the letter W on Warrant
          Certificates of all denominations.

                    Warrant Certificates shall be executed on behalf of the
          Company by its Chairman of the Board, President or any Vice
          President and by its Treasurer or an Assistant Treasurer or its
          Secretary or an Assistant Secretary, by manual signatures or by
          facsimile signatures printed thereon, and shall have imprinted
          thereon a facsimile of the Company's seal.  Warrant Certificates
                                                      =====================
          shall be manually countersigned by the Warrant Agent and shall 
          ===============================================================
          not be valid for any purpose unless so countersigned.  In case 
          =====================================================
          any officer of the Company who shall have signed any of the
          Warrant Certificates shall cease to be such officer of the
          Company before the date of issuance or before countersignature by
                             ==============================================
          the Warrant [Certificates so signed shall have been issued by the
          ===
          Company and delivered] Agent and issue and delivery thereof to 
                                 ====================================
          the applicable Registered Holders, such Warrant Certificates may
          nevertheless be countersigned by the Warrant Agent, issued and 
                          ===================================
          delivered with the same force and effect as though the person who
          signed such Warrant Certificates had not ceased to be such
          officer of the Company.  After countersignature by the Warrant 
                                   ======================================
          Agent, Warrant Certificates shall be delivered by the Warrant 
          ==============================================================
          Agent to the Registered Holder without further action by the 
          =============================================================
          Company, except as otherwise provided by Section 4 hereof.  In 
          ==========================================================
          case the Company shall change its name or its state of
          incorporation, Warrant Certificates bearing the Company's
          previous name or state of incorporation shall continue to be
          valid for all purposes.

                    SECTION 4.  Exercise, Each Warrant may be exercised by
                                --------
          the Registered Holder thereof at any time on or after the Initial
          Warrant Exercise Date, but not after the Warrant Expiration Date,
          upon the terms and subject to the conditions set forth herein and
          in the related Warrant Certificate.  [Upon each such exercise of
          Warrants, the Company shall, as promptly as practicable] As soon
                                                                   ========
          as practicable on or after the Exercise Date the Warrant Agent 
          ===============================================================
          shall deposit the proceeds received from the exercise of a 
          ===========================================================
          Warrant and shall notify the Company in writing of the exercise 
          ================================================================
          of the Warrants.  Promptly following, and in any event within 
          =====================================
          seven days [thereafter, execute and cause ]after the date of such
                                                     ======================
          notice from the Warrant Agent, the Warrant Agent, on behalf of 
          ===============================================================
          the Company, shall cause to be issued and delivered by the 
          ======================================================
          Transfer Agent [to countersign and deliver, in accordance with
          the related notice of election to purchase], to the person or 
                                                     ===================
          persons entitled to receive the same, a certificate or 
          ====================================
          certificates [ representing the aggregate number of shares of


                                      4
     <PAGE>


          Common Stock issuable] for the securities deliverable upon such 
                                 ==============================
          exercise, [as such number shall be adjusted from time to time
          pursuant to the provisions of Sections 8 and 10 hereof] unless 
                                                                  =======
          prior to the date of issuance of such certificates the Company 
          ================================================================
          shall instruct the Warrant Agent to refrain from causing such 
          ==============================================================
          issuance of certificates pending clearance of checks received in
          =================================================================
          payment of the Purchase Price pursuant to such Warrants.  The 
          ========================================================
          stock certificate or certificates so delivered shall be in such
          denominations as may be specified in such notice or, if such
          notice shall not specify denominations, a single certificate
          representing all the shares of Common Stock issuable upon such
          exercise shall be delivered, and in either case such certificate
          or certificates shall be issued in the name of the exercising
          Registered Holder or such other name or names as shall be
          designated in such notice.  Such certificate or certificates
          shall be deemed to have been issued, and such Registered Holder
          or any other person so designated to be named therein shall be
          deemed for all purposes to have become a holder of record of such
          shares, as of the related Exercise Date.  If a Warrant shall have
          been exercised only in part, the Company shall, at the time of
          delivery of the applicable stock certificate or certificates,
          deliver to the applicable Registered Holder a new Warrant
          Certificate to evidence any unexercised Warrants held by such
          Registered Holder, which new Warrant Certificate shall in all
          other respects be identical with the Warrant Certificate
          surrendered.  Upon the exercise of any Warrant and clearance of 
                      ====================================================
          the funds received, the Warrant Agent shall promptly remit the 
          ================================================================
          payment received for the Warrant to the Company or as the Company
          =================================================================
          may direct in writing, subject to the provisions of Section 4 
          ==============================================================
          hereof.
          =======

                    SECTION 5.  Reservation of Shares; Listing; Payment of
                                -------------------------------------------
          Taxes, etc. (a) The Company covenants that it will at all times 
          -----------
          reserve and keep available out of its authorized Common Stock,
          solely for the purpose of issue upon exercise of Warrants, such
          number of shares of Common Stock as shall then be issuable upon
          the exercise of all outstanding Warrants.  The Company covenants
          that all shares of Common Stock issued from time to time upon the
          exercise of Warrants shall be duly and validly issued, fully
          paid, nonassessable and free from all taxes, liens and other
          charges, and that upon issuance such shares shall be listed on
          each national securities exchange (including NASDAQ), if any, on
          which any other shares of outstanding Common Stock of the Company
          are then listed.

                    (b)  The Company shall pay all expenses, taxes and
          other charges payable in connection with the preparation,
          issuance and delivery of stock certificates and Warrant
          Certificates; provided, however, that (i) if stock certificates 
                        --------  -------
          or new Warrant Certificates are to be delivered in a name other
          than the name of the related Registered Holder, all transfer
          taxes payable as a result of such transfer shall be paid by such
          Registered Holder and (ii) delivery by the Company of stock
          certificates or new Warrant Certificates in connection with such
          transfer shall not be required hereunder unless such transfer
          taxes, if any, shall have been paid.

                    (c)  The Warrant Agent is hereby irrevocably authorized
                    ===  ==================================================
          to requisition the Company's Transfer Agent from time to time for
          =================================================================
          certificates representing shares of Common Stock issuable upon 
          ===============================================================
          exercise of the Warrants, and the Company will authorize the 
          =============================================================
          Transfer Agent to comply with all such proper requisitions.  The
          ================================================================
          Company will file with the Warrant Agent a statement setting 
          =============================================================


                                      5
     <PAGE>


          forth the name and address of the Transfer Agent of the Company 
          ================================================================
          for shares of Common Stock issuable upon exercise of the Warrants
          =================================================================
          if the Transfer Agent is other than that named in Section 1(i).
          ===============================================================

                    SECTION 6.  Exchange and Registration of Transfer.  
                                -------------------------------------
          (a)  Warrant Certificates for 1999 UNS Warrants may be exchanged
                                    =====================
          for other 1999 UNS Warrant Certificates representing an equal 
                    ========
          aggregate number of 1999 UNS Warrants and [the] Warrant 
                              ========                    ========
          Certificates for 2000 UNS Warrants may be exchanged for other 
          ==============================================================
          2000 UNS Warrant Certificates representing an equal aggregate 
          ==============================================================
          number of 2000 UNS Warrants.  The transfer of Warrant 
          =================================
          Certificates may be registered, in whole or in part.  Warrant
          Certificates to be exchanged shall be surrendered to the
          [Company]  Warrant Agent at its Corporate Office, and upon 
                    ==============
          satisfaction of the terms and provisions hereof, the Company
          shall execute, and the Warrant agent shall countersign, issue and
                        =========================================
          deliver in exchange therefor the Warrant Certificate or
          Certificates requested by the Registered Holder making the
          exchange.

                    (b)  The [Company] Warrant Agent shall keep at its 
                                       =============
          Corporate Office books in which, subject to such reasonable
          regulations as it may prescribe, it shall register Warrant
          Certificates and the transfer thereof.  Upon due presentment for
          registration of transfer of any Warrant Certificate at such
          office or agency, the Company shall execute, and the Warrant 
                                                       ================
          Agent shall countersign, issue and deliver to the transferee or 
          ========================
          transferees a new 1999 UNS Warrant Certificate or Certificates or
                            ========                                     ==
          a new 2000 UNS Warrant Certificate or Certificates, as the case 
          ================================================================
          may be, representing an equal aggregate number of 1999 UNS 
          =======                                           ========
          Warrants or 2000 UNS Warrants, as the case may be.  
                   ========================================
          Notwithstanding the foregoing, a Warrant may be exercised by a
          new Registered Holder without a new Warrant Certificate having
          been issued.

                    (c)  With respect to all Warrant Certificates presented
          for registration of transfer, (i) an assignment in substantially
          the form of the Assignment set forth in [Exhibit] Exhibits A and
                                                            ===============
          B hereto shall be duly executed, or (ii) such Warrant
          Certificates shall be accompanied by a written instrument or
          instruments of transfer in form satisfactory to the Company and 
                                                                      ====
          the Warrant Agent and duly executed by the Registered Holder or 
          =================
          its attorney-in-fact duly authorized in writing.

                    (d)  All Warrant Certificates presented for
          registration of transfer or surrendered for exchange shall be
          promptly canceled by the [Company] Warrant Agent and thereafter 
                                             =============
          retained by the [Company] Warrant Agent until termination of this
                                    =============
          Agreement, or resignation of the Warrant Agent, or until 
                     ====================================
          destroyed, at the discretion of the Company.

                    (e)  Prior to due presentment for registration of
          transfer thereof, the Company and the Warrant Agent may deem and
                                        =====================
          treat the Registered Holder of any Warrant Certificate as the
          absolute owner and holder thereof and of each Warrant represented
          thereby (notwithstanding any notations of ownership or writing
          thereon made by any person other than a duly authorized officer
          of the Company [)] or Warrant Agent) for all purposes and shall 
                             =================
          not be affected by any notice to the contrary.


                                      6
     <PAGE>

                    SECTION 7.  Loss or Mutilation.  Upon receipt by the 
                                ------------------
          Company and the Warrant Agent of evidence satisfactory to [it] 
                  =====================
          them of the ownership of and loss, theft, destruction or 
          ====
          mutilation of any Warrant Certificate and (in case of loss, theft
          or destruction) of indemnity satisfactory to [it] them or (in the
                                                            ====
          case of mutilation) upon surrender and cancellation thereof, the
          Company shall execute and the Warrant Agent shall (in the absence
                                    =======================================
          of notice to the Company and/or Warrant Agent that the Warrant 
          ===============================================================
          Certificate has been acquired by a bona fide purchaser) 
          ========================================================
          countersign and deliver to the applicable Registered Holder in 
          ===============
          lieu thereof a new 1999 UNS Warrant Certificate or a new 2000 UNS
                             ========                     =================
          Warrant Certificate, as the case may be, of like tenor, 
          ========================================
          representing an equal aggregate number of Warrants.  Applicants
          for a substitute Warrant Certificate under this Section 7 shall
          comply with such other reasonable regulations and pay such
          reasonable charges as the Company and the Warrant Agreement may 
                                            =========================
          prescribe.

                    SECTION 8.  Adjustment of Exercise Price and Number of
                                -------------------------------------------
          Shares of Common Stock.  The number and kind of shares 
          ----------------------
          purchasable upon the exercise of Warrants and the Purchase Price
          shall be subject to adjustment from time to time as follows:

                    (a)  Changes in Common Stock, In the event the Company
                         -----------------------
          shall, at any time or from time to time after the date hereof,
          (i) issue any shares of Common Stock as a stock dividend to the
          holders of Common Stock, (ii) subdivide or combine the
          outstanding shares of Common Stock into a greater or lesser
          number of shares or (iii) issue any shares of its capital stock
          in a reclassification or reorganization of the Common Stock (any
          such issuance, subdivision, combination, reclassification or
          reorganization being herein called a "Change of Shares"), then
          (A) in the case of (i) or (ii) above, the number of shares of
          Common Stock that may be purchased upon the exercise of each
          Warrant shall be adjusted  to the number of shares of Common
          Stock that the Registered Holder of such Warrant would have owned
          or have been entitled to receive after the happening of such
          event had such Warrant been exercised immediately prior to the
          record date (or, if there is no record date, the effective date)
          for such event, and the Purchase Price shall be adjusted to the
          price (calculated to the nearest 1,000th of one cent) determined
          by multiplying the Purchase Price immediately prior to such event
          by a fraction the numerator of which shall be the number of
          shares of Common Stock purchasable with one Warrant immediately
          prior to such event and the denominator of which shall be the
          number of shares of Common Stock purchasable with one Warrant
          after the adjustment referred to above and (B) in the case of
          (iii) above, paragraph (l) below shall apply.  An adjustment made
          pursuant to clause (A) of this paragraph (a) shall become
          effective retroactively immediately after the record date in the
          case of a dividend and shall become effective immediately after
          the effective date in other cases.  Any shares of Common Stock
          purchasable solely as a result of such adjustment shall not be
          issued prior to the effective date of such event.

                    (b)  Common Stock Distribution.  In the event the 
                         -------------------------
          Company shall, at any time or from time to time after the date
          hereof, issue, sell or otherwise distribute any shares of Common
          Stock (other than pursuant to a Change of Shares or the exercise
          of any [option] Option, Convertible Security (each as defined in
                          ======
          paragraph (c) below) or Warrant (any such event, including any


                                      7
     <PAGE>


          event described in paragraphs (c) and (d) below, being herein
          called a "Common Stock Distribution"), for a consideration per
          share less than the current market price per share of Common
          Stock (as defined in paragraph (f) below) on the date of such
          Common Stock Distribution, then, effective upon such Common Stock
          Distribution, the Purchase Price shall be reduced to the price
          (calculated to the nearest 1,000th of one cent) determined by
          multiplying the Purchase Price in effect immediately prior to
          such Common Stock Distribution by a fraction, the numerator of
          which shall be the sum of (i) the number of shares of Common
          Stock outstanding (exclusive of any treasury shares) immediately
          prior to such Common Stock Distribution multiplied by the current
          market price per share of Common Stock on the date of such Common
          Stock Distribution, plus (ii) the consideration, if any, received
          by the Company upon such Common Stock Distribution and the
          denominator of which shall be the product of (A) the total number
          of shares of Common Stock outstanding (exclusive of any treasury
          shares) immediately after such Common Stock Distribution
          multiplied by (B) the current market price per share of Common
          Stock on the date of such Common Stock Distribution.

                    If any Common Stock Distribution shall require an
          adjustment to the Purchase Price pursuant to the foregoing
          provisions of this paragraph (b) including by operation of
          paragraph (c) or (d) below, then, effective at the time such
          adjustment is made, the number of shares of Common Stock
          purchasable upon the exercise of each Warrant shall be increased
          to a number determined by multiplying the number of such shares
          so purchasable immediately prior to such Common Stock
          Distribution by a fraction, the numerator of which shall be the
          Purchase Price in effect immediately prior to such adjustment and
          the denominator of which shall be the Purchase Price in effect
          immediately after such adjustment.  In computing adjustments
          under this paragraph, fractional interests in Common Stock shall
          be taken into account to the nearest 1,000th of a share.

                    The provisions of this paragraph (b), including by
          operation of paragraph (c) or (d) below, shall not operate to
          increase the Purchase Price or reduce the number of shares of
          Common Stock purchasable upon the exercise of any Warrant.

                    (c)  Issuance of Options.  In the event the Company 
                         -------------------
          shall, at any time or from time to time after the date hereof
          issue, sell, distribute or otherwise grant in any manner
          (including by assumption) any rights to subscribe for or to
          purchase, or any warrants or options for the purchase of, Common
          Stock or any stock or securities convertible into or exchangeable
          for Common Stock (any such rights, warrants or options being
          herein called "Options" and any such convertible or exchangeable
          stock or securities being herein called "Convertible
          Securities"), whether or not such Options or the rights to
          convert or exchange such Convertible Securities are immediately
          exercisable, and the price per share at which Common Stock is
          issuable upon the exercise of such Options or upon the conversion
          or exchange of such Convertible Securities (determined by
          dividing (i) the aggregate amount, if any, received or receivable
          by the Company as consideration for the issuance, sale,
          distribution or granting of such Options, plus the minimum
          aggregate amount of additional consideration, if any, payable to
          the Company upon the exercise of all such Options, plus, in the


                                      8
     <PAGE>


          case of Options to acquire Convertible Securities, the minimum
          aggregate amount of additional consideration, if any, payable
          upon the conversion or exchange of all such Convertible
          Securities, by (ii) the total maximum number of shares of Common
          Stock issuable upon the exercise of all such Options or upon the
          conversion or exchange of all Convertible Securities issuable
          upon the exercise of all such Options) shall be less than the
          current market price per share of Common Stock on the date of the
          issuance, sale, distribution or granting of such Options then,
          for purposes of paragraph (b) above, the total maximum number of
          shares of Common Stock issuable upon the exercise of all such
          Options or upon the conversion or exchange of the total maximum
          amount of the Convertible Securities issuable upon the exercise
          of all such Options shall be deemed to have been issued as of the
          date of the issuance, sale, distribution or granting of such
          Options and thereafter shall be deemed to be outstanding and the
          Company shall be deemed to have received as consideration such
          price per share, determined as provided above, therefor.  Except
          as otherwise provided in paragraphs (j) and (k) below, no
          additional adjustment of the Purchase Price shall be made upon
          the actual exercise of such Options or upon conversion or
          exchange of the Convertible Securities issuable upon the exercise
          of such Options.

                    (d)  Issuance of Convertible Securities.  In the event
                         ----------------------------------
          the Company shall, at any time or from time to time after the
          date hereof, issue, sell or otherwise distribute (including by
          assumption) any Convertible Securities (other than upon the
          exercise of any Option), whether or not the rights to convert or
          exchange such Convertible Securities are immediately exercisable,
          and the price per share at which Common Stock is issuable upon
          the conversion or exchange of such Convertible Securities
          (determined by dividing (i) the aggregate amount, if any,
          received or receivable by the Company as consideration for the
          issuance, sale or distribution of such Convertible Securities,
          plus the minimum aggregate amount of additional consideration, if
          any, payable to the Company upon the conversion or exchange of
          all such Convertible Securities, by (ii) the total maximum number
          of shares of Common Stock issuable upon the conversion or
          exchange of all such Convertible Securities) shall be less than
          the current market price per share of Common Stock on the date of
          such issuance, sale or distribution, then, for purposes of
          paragraph (b) above, the total maximum number of shares of Common
          Stock issuable upon the conversion or exchange of all such
          Convertible Securities shall be deemed to have been issued as of
          the date of the issuance, sale or distribution of such
          Convertible Securities and thereafter shall be deemed to be
          outstanding and the Company shall be deemed to have received as
          consideration such price per share, determined as provided above,
          therefor.  Except as otherwise provided in paragraphs (j) and (k)
          below, no additional adjustment of the Purchase Price shall be
          made upon the actual conversion or exchange of such Convertible
          Securities.

                    (e)  Dividends and Distributions.  In the event the 
                         ---------------------------
          Company shall, at any time or from time to time after the date
          hereof, distribute to the holders of Common Stock any dividend or
          other distribution of cash, evidences of its indebtedness, other
          securities or other properties or assets in each case other than
          (i) dividends payable in Common Stock[,] Options or Convertible
          Securities and (ii) any cash dividend that, when added to all
          other cash dividends paid in the one year prior to the
          declaration date of such dividend (excluding any such other


                                      9
     <PAGE>


          dividend included in a previous adjustment of the Purchase Price
          pursuant to this paragraph (e), does not exceed 10% of the
          current market price per share of Common Stock on such
          declaration date), or any options, warrants or other rights to
          subscribe for or purchase any of the foregoing, then (A) the
          Purchase Price shall be decreased to a price determined by
          multiplying the Purchase Price then in effect by a fraction, the
          numerator of which shall be the current market price per share of
          Common Stock on the record date for such distribution less the
          sum of (X) the cash portion, if any, of such distribution per
          share of Common Stock outstanding (exclusive of any treasury
          shares) on the record date for such distribution plus (Y) the
          then fair market value (as determined in good faith by the Board
          of Directors of the Company) per share of Common Stock
          outstanding (exclusive of any treasury shares) on the record date
          for such distribution of that portion, if any, of such
          distribution consisting of evidences of indebtedness, other
          securities, properties, assets, options, warrants or subscription
          or purchase rights, and the denominator of which shall be such
          current market price per share of Common Stock and (B) the number
          of shares of Common Stock purchasable upon the exercise of each
          Warrant shall be increased to a number determined by multiplying
          the number of shares of Common Stock so purchasable immediately
          prior to the record date for such distribution by a fraction, the
          numerator of which shall be the Purchase Price in effect
          immediately prior to the adjustment required by clause (A) of
          this sentence and the denominator of which shall be the Purchase
          Price in effect immediately after such adjustment.  The
          adjustments required by this paragraph (e) shall be made whenever
          any such distribution is made and shall become effective as of
          the date of such distribution retroactive to the record date for
          the determination of stockholders entitled to receive such
          distribution.

                    (f)  Current Market Price.  For the purpose of any 
                         --------------------
          computation under paragraphs (b), (c), (d) and (e) of this
          Section, the current market price per share of Common Stock at
          any date shall be the average of the daily closing prices for the
          shorter of (i) the 20 consecutive trading days ending on the last
          full trading day on the exchange or market specified in the
          second succeeding sentence prior to the Time of Determination and
          (ii) the period commencing on the date next succeeding the first
          public announcement of the issuance, sale, distribution or
          granting in question through such last full trading day prior to
          the Time of Determination.  The term "Time of Determination" as
          used herein shall be the time and date of the earlier to occur of
          (A) the date as of which the current market price is to be
          computed and (B) the last full trading day on such exchange or
          market before the commencement of "ex-dividend" trading in the
          Common Stock relating to the event giving rise to the adjustment
          required by paragraph (b), (c), (d) or (e).  The closing price
          for any day shall be the last reported sale price regular way or,
          in case no such reported sale takes place on such day, the
          average of the closing bid and asked prices regular way for such
          day, in each case (1) on the principal national securities
          exchange on which the shares of Common Stock are listed or to
          which such shares are admitted to trading or (2) if the Common
          Stock is not listed or admitted to trading on a national
          securities exchange, in the over-the-counter market as reported
          by NASDAQ or any comparable system or (3) if the Common Stock is
          not listed on NASDAQ or a comparable system, as furnished by two
          members of the NASD selected from time to time in good faith by


                                      10
     <PAGE>


          the Board of Directors of the Company for that purpose.  In the
          absence of all of the foregoing, or if for any other reason the
          current market price per share cannot be determined pursuant to
          the foregoing provisions of this paragraph (f), the current
          market price per share shall be the fair market value thereof as
          determined in good faith by the Board of Directors of the
          Company.

                    (g)  Certain Distributions.  If the Company shall pay a
                         ---------------------
          dividend or make any other distribution payable in Options or
          Convertible Securities, then, for purposes of paragraph (b) above
          (by operation of paragraph (c) or (d) above, as the case may be),
          such Options or Convertible Securities shall be deemed to have
          been issued or sold without consideration.

                    (h)  Consideration Received.  If any shares of Common 
                         ----------------------
          Stock, Options or Convertible Securities shall be issued, sold or
          distributed for cash, the consideration received in respect
          thereof shall be deemed to be the amount received by the Company
          therefor, after deduction from such amount of any expenses
          incurred and any underwriting commissions or concessions paid or
          allowed by the Company in connection therewith; provided, 
                                                          --------
          however, that the expenses, commissions and concessions relating
          -------
          to any particular issuance, sale or distribution for cash shall
          not be so deducted if, on or prior to the date thereof, the
          Company furnishes each Registered Holder with an officer's
          certificate representing that such expenses, commissions and
          concessions are recoverable through customer rates.  If any
          shares of Common Stock, Options or Convertible Securities shall
          be issued, sold or distributed for a consideration other than
          cash, the amount of the consideration other than cash received by
          the Company in respect thereof shall be deemed to be the then
          fair market value of such consideration (as determined in good
          faith by the Board of Directors of the Company), after deduction
          of any expenses incurred and any underwriting commissions or
          concessions paid or allowed by the Company in connection
          therewith.  If any Options shall be issued in connection with the
          issuance and sale of other securities of the Company[,] together
          comprising one integral transaction in which no specific
          consideration is allocated to such Options by the parties
          thereto, such Options shall be deemed to have been issued without
          consideration.

                    (i)  Deferral of Certain Adjustments.  No adjustment to
                         -------------------------------
          the Purchase Price (including the related adjustment to the
          number of shares of Common Stock purchasable upon the exercise of
          each Warrant) shall be required hereunder unless such adjustment,
          together with other adjustments carried forward as provided
          below, would result in an increase or decrease of at least one
          percent of the Purchase Price; provided, however, that any 
                                         --------  -------
          adjustments which by reason of this paragraph (i) are not
          required to be made shall be carried forward and taken into
          account in any subsequent adjustment.  No adjustment need be made
          for a change in the par value of the Common Stock.

                    (j)  Changes in Options and Convertible Securities.  If
                         ---------------------------------------------
          the exercise price provided for in any Options referred to in
          paragraph (c) above, the additional consideration, if any,
          payable upon the conversion or exchange of any Convertible
          Securities referred to in paragraph (c) or (d) above, or the rate


                                      11
     <PAGE>


          at which any Convertible Securities referred to in paragraph (c)
          or (d) above are convertible into or exchangeable for Common
          Stock shall change at any time (other than under or by reason of
          provisions designed to protect against dilution upon an event
          which results in a related adjustment pursuant to this Section
          8), the Purchase Price then in effect and the number of shares of
          Common Stock purchasable upon the exercise of,each Warrant shall
          forthwith be readjusted (effective only with respect to any
          exercise of any Warrant after such readjustment) to the Purchase
          Price and number of shares of Common Stock so purchasable that
          would then be in effect had the adjustment made upon the
          issuance, sale, distribution or granting of such Options or
          Convertible Securities been made based upon such changed purchase
          price, additional consideration or conversion rate, as the case
          may be, but only with respect to such Options and Convertible
          Securities as then remain outstanding.

                    (k)  Expiration of Options and Convertible Securities.
                         ------------------------------------------------
          If, at any time after any adjustment to the number of shares of
          Common Stock purchasable upon the exercise of each Warrant shall
          have been made pursuant to paragraph (c), (d) or (j) above or
          this paragraph (k), any Options or Convertible Securities shall
          have expired unexercised, the number of such shares so
          purchasable shall, upon such expiration, be readjusted and shall
          thereafter be such as they would have been had they been
          originally adjusted (or had the original adjustment not been
          required, as the case may be) as if (i) the only shares of Common
          Stock deemed to have been issued in connection with such Options
          or Convertible Securities were the shares of Common Stock, if
          any, actually issued or sold upon the exercise of such Options or
          Convertible Securities and (ii) such shares of Common Stock, if
          any, were issued or sold for the consideration actually received
          by the Company upon such exercise plus the aggregate
          consideration, if any, actually received by the Company for the
          issuance, sale, distribution or granting of all such Options or
          Convertible Securities, whether or not exercised; provided, 
                                                            --------
          however, that no such readjustment shall have the effect of 
          -------
          decreasing the number of such shares so purchasable by an amount
          (calculated by adjusting such decrease to account for all other
          adjustments made pursuant to this Section 8 and Section 10
          following the date of the original adjustment referred to above)
          in excess of the amount of the adjustment initially made in
          respect of the issuance, sale, distribution or granting of such
          Options or Convertible Securities.

                    (l)  Other Adjustments.  In the event that at any time,
                         -----------------
          as a result of an adjustment made pursuant to this Section 8 or
          Section 10, the Registered Holders shall become entitled to
          receive any securities of the Company other than shares of Common
          Stock, thereafter the number of such other securities so
          receivable upon exercise of the Warrants and the Purchase Price
          applicable to such exercise shall be subject to adjustment from
          time to time in a manner and on terms as nearly equivalent as
          practicable to the provisions with respect to the shares of
          Common Stock contained in this Section 8 and Section 10.

                    (m)  Excluded Transactions.  Notwithstanding any 
                         ---------------------
          provision in this Section 8 to the contrary, no adjustment shall
          be made pursuant to this Section 8 in respect of (i) the granting
          of any Options or the issuance of any shares of Common Stock that


                                      12
     <PAGE>


          may be registered on Form S-8 or any successor form under the
          Securities Act of 1933, as amended, to any officers, directors or
          employees of, or any consultants or advisors to, the Company or 
                                                                       ===
          any of its affiliates, or (ii) the issuance of Common Stock 
          =====================
          pursuant to any dividend reinvestment or direct stock purchase 
                                                =========================
          plan which provides that the price of the Common Stock purchased
          for plan participants from the Company will be the average of the
          high and low sales prices of the Common Stock as reported on the
                                                        ===========
          consolidated [tape] transaction reporting system on the day the 
                              ============================        ========
          investment [date] is made or, if no trading in the Common Stock 
                            =======
          occurs on such date, the next preceding date on which trading
          occurred; provided, however, that clause (i) of this paragraph 
                    -----------------
          (m) shall not apply to any such grant or issuance if, after
          giving effect thereto, the aggregate amount of Common Stock
          issued in all transactions covered by clause (i) of this
          paragraph (m) (assuming the exercise of all then outstanding
          Options granted in such transactions) would exceed 5% of the
          number of shares of Common Stock then outstanding (after giving
          effect to the exercise of all then outstanding Options so granted
          but before giving effect to any other exercise of Options or
          Convertible Securities).

                    SECTION 9.  Notice of Adjustment.  Whenever the 
                                --------------------
          Purchase Price or the number of shares of Common Stock or other
          property purchasable upon the exercise of any Warrant is required
          to be adjusted as herein provided, the Company promptly shall
          deliver to the Warrant Agent, and the Warrant Agent shall 
                     ===============================================
          promptly forward to each Registered Holder, notice of such 
          ===================                       =
          adjustment and a certificate of a firm of independent public
          accountants selected by the Board of Directors of the Company
          (who may be the regular accountants employed by the Company)
          setting forth in reasonable detail (a) the Purchase Price and the
          number of shares of Common Stock or other property purchasable
          upon the exercise of each Warrant after such adjustment, (b) a
          brief statement of the facts requiring such adjustment and (c)
          the computation by which such adjustment was made and the methods
          and underlying assumptions utilized.

                    SECTION 10.  Preservation of Purchase Rights upon 
                                 -------------------------------------
          Merger, Consolidation, etc.; Mandatory Redemption of Warrants. 
          -------------------------------------------------------------
          (a)  In case of any consolidation or merger of the Company with
          or into another person or in case of any sale, transfer or lease
          to another person of all or substantially all the property of the
          Company, the Company and such successor or purchasing person, as
          the case may be, shall agree in writing (and such consolidation,
          merger, sale, transfer or lease shall not be consummated without
          such agreement) that each Registered Holder shall have the right
          thereafter upon payment of the Purchase Price in effect
          immediately prior to such action to purchase upon exercise of a
          Warrant the kind and amount of securities, cash and other
          property that it would have owned or have been entitled to
          receive after the happening of such consolidation, merger, sale,
          transfer or lease  had such Warrant been exercised immediately
          prior to such action (provided that if the kind and amount of
          securities, cash and other property receivable upon such
          consolidation, merger, sale, transfer or lease is not the same
          for each share of Common Stock of the Company, then for the
          purposes of this paragraph (a) the kind and amount of securities,
          cash and other property receivable upon exercise of the Warrants
          immediately after such consolidation, merger, sale, transfer or


                                      13
     <PAGE>


          lease shall be the kind and amount so receivable per share by the
          holders of a majority of the outstanding shares of Common Stock). 
          Such written agreement shall provide for adjustments which shall
          be as nearly equivalent as practicable to the adjustments
          provided for in Section 8 and this paragraph (a) and shall
          provide that such adjustments shall similarly apply to successive
          consolidations, mergers, sales, transfers and leases.

                    (b)  Each Registered Holder shall have the option to
          require the Company (or its successor) to redeem all or any part
          of such Registered Holder's Warrants upon the consummation of any
          consolidation or merger of the Company with or into another
          person or any sale, transfer or lease to another person of all or
          substantially all the property of the Company.  A Registered
          Holder may exercise such option by giving to the Company, within
          10 Business Days after such Registered Holder's receipt of the
          notice given by the Company pursuant to Section 18 hereof in
          respect of the consolidation, merger, sale, transfer or lease in
          question (or, if such notice is not timely given by the Company,
          at any time prior to such consummation), a written notice (a
          "Notice of Exercise") substantially in the form attached to the
          Warrant Certificates.

                    From and after the giving of any Notice of Exercise,
          each Warrant covered thereby shall represent the right of the
          Registered Holder thereof to receive from the Company (or its
          successor), on the date on which the consolidation, merger, sale,
          transfer or lease in question is consummated, an amount equal to
          the current market price of such Warrant; provided, however, that
                                                    -----------------
          the Registered Holder shall have the  right to revoke such Notice
          of Exercise and instead exercise such Warrant prior to such date
          in lieu of receiving such amount.  For purposes of this paragraph
          (b), the current market price of each Warrant shall equal the
          average of the daily closing prices of the Warrants for the 20
          consecutive trading days ending on the last full trading day on
          the exchange or market identified pursuant to the next succeeding
          sentence prior to the first public announcement of the
          consolidation, merger, sale, lease or transfer in question.  The
          closing price of the Warrants for any day shall be determined in
          the same manner as the closing price of the Common Stock is
          determined under the third sentence of Section 8(f). If for any
          reason the daily closing prices of the Warrants during such 20-
          trading day period cannot be determined as provided in such
          sentence, the current market price of each Warrant shall equal
          the average fair market value for the 20 consecutive Business
          Days preceding such first public announcement, as determined by
          two members of the NASD selected in good faith by the Board of
          Directors of the Company.

                    The nonexercise of the foregoing option with respect to
          any Warrant in connection with any consolidation, merger, sale,
          lease or transfer shall not preclude the exercise of such option
          with respect to such Warrant in connection with any subsequent
          consolidation, merger, sale, lease or transfer.  In the case of
          any consolidation or merger in which the Company is not the
          surviving entity or in the case of any sale, lease or transfer,
          the Company shall cause its successor to agree in writing (and
          such consolidation, merger, sale, lease or transfer shall not be
          consummated without such agreement) that it shall be responsible
          for the performance of the Company's obligations under this
          paragraph (b).


                                      14
     <PAGE>

                    SECTION 11.  Statement Concerning Warrant Certificates. 
                                 -----------------------------------------
          The Company may, but shall not be obligated to, issue replacement
          Warrant Certificates upon any adjustment to the Purchase Price or
          the number or kind of shares purchasable upon exercise of the
          Warrants.  Irrespective of any such adjustment, the Warrant
          Certificates theretofore and thereafter issued shall, unless the
          Company shall exercise its option to issue new Warrant
          Certificates pursuant to this Section 11, continue to express the
          same Purchase Price per share, and the same number of shares
          purchasable thereunder, as were expressed in the Warrant
          Certificates when the same were originally issued.

                    SECTION 12.  Common Stock.  As used in Sections 8, 9, 
                                 ------------
          10 and 11, the term "Common Stock" shall mean and include the
          Company's Common Stock authorized on the Initial Warrant Exercise
          Date and shall also include any capital stock of any class of the
          Company thereafter authorized which shall not be limited to a
          fixed sum or percentage in respect of the rights of the holders
          thereof to participate in dividends and in the distribution of
          assets upon the voluntary liquidation, dissolution or winding up
          of the Company; provided, however, that subject to Sections 8 and
                          --------  -------
          10, the shares issuable upon exercise of the Warrants shall
          include only shares of such class designated in the Company's
          Certificate of Incorporation as Common Stock on the Initial
          Warrant Exercise Date or (a) in the case of any consolidation,
          merger, sale, transfer or lease described in Section 10, the
          stock, securities or property provided for in such Section or (b)
          in the case of any reclassification or change in the outstanding
          shares of Common Stock issuable upon exercise of the Warrants as
          a result of a subdivision or combination or consisting of a
          change in par value, or from par value to no par value, or from
          no par value to par value, such shares of Common Stock as so
          reclassified or changed.  Notwithstanding any other provision of
          this Agreement to the contrary, before taking any action that
          would cause an adjustment reducing the Purchase Price below the
          then par value, if any, of the shares of Common Stock issuable
          upon exercise of the Warrants, the Company shall take all
          corporate action necessary, in the opinion of its counsel, in
          order that the Company may validly and legally issue fully paid
          and nonassessable shares of Common Stock at the adjusted Purchase
          Price.

                    SECTION 13.  Warrant Expiration Date.  Each Warrant not
                                 -----------------------
          exercised on or before the Warrant Expiration Date shall become
          void and all rights of the Registered Holder thereof thereunder
          and under this Agreement in respect of such Warrant shall cease.

                    SECTION 14.  Fractional Warrants and Fractional Shares. 
                                 -----------------------------------------
          If the number of Warrants or the number of shares of Common Stock
          purchasable upon the exercise of each Warrant is adjusted
          pursuant to Section 8 or 10, the Company shall nevertheless not
          be required to issue fractions of Warrants or fractions of shares
          of Common Stock, upon exercise of the Warrants or otherwise, or
          to distribute certificates that evidence fractional Warrants or
          fractional shares of Common Stock.  With respect to any fraction
          of a Warrant called for in the aggregate Warrant position of any
          Registered Holder upon any adjustment pursuant to Section 8 or 10
          or any fraction of a share of Common Stock called for given the
          aggregate number of shares issuable upon any exercise by a
          Registered Holder of Warrants, such fraction shall be rounded to
          the nearest whole number (.50 being rounded upward).


                                      15
     <PAGE>

                    SECTION 15.  Registered Holders Not Deemed 
                                 ------------------------------
          Shareholders.  No Registered Holder of Warrants shall, as such, 
          ------------
          be entitled to vote or to receive dividends or be deemed the
          holder of Common Stock that may at any time be issuable upon
          exercise of such Warrants for any purpose whatsoever, nor shall
          anything contained herein be construed to confer upon the
          Registered Holders of the Warrants, as such, any of the rights of
          a shareholder of the Company or any right to vote for the
          election of directors or upon any matter submitted to
          shareholders at any meeting thereof, or to give or withhold
          consent to any corporate action (whether upon any
          recapitalization, issue or reclassification of stock, change of
          par value, consolidation, merger or conveyance or otherwise), or
                                                                      =
          to receive notice of meetings, or to receive dividends or
          subscription rights until such Registered Holder shall have
          exercised Warrants in accordance with the provisions hereof.

                    SECTION 16.  Cancellation of Warrant Certificates.  If
                                 ------------------------------------
          the Company shall purchase or acquire any Warrant or Warrants,
          the Warrant Certificate or Warrant Certificates evidencing the
          same shall thereupon be canceled by it and retired.  The Company
          shall also cancel Warrant Certificates following exercise of any
          or all of the Warrants represented thereby or delivered to it for
          registration of transfer or exchange.

                    SECTION 17.  Rights of Action.  All rights of action 
                                 ----------------
                               ==========================================
          with respect to this Agreement are vested in the respective 
          ============================================================
          Registered Holders of the Warrants, and any Registered Holder of
          =================================================================
          a Warrant, without consent of the Warrant Agent or of the holder
          =================================================================
          of any other Warrant, may, in his, her or its own behalf and for
          ================================================================
          his, her or its own benefit, enforce against the Company such 
          ==============================================================
          Registered Holder's right to exercise his, her or its Warrants 
          ===============================================================
          for the purchase of shares of Common Stock in the manner provided
          =================================================================
          in the Warrant Certificate and this Agreement.
          ==============================================

                    SECTION 18.  Agreement of Warrantholders.  Every holder
                                 ---------------------------
                    =======================================================
          of a Warrant, by such holder's acceptance thereof, consents and 
          ================================================================
          agrees with the Company, the Warrant Agent and every other holder
          =================================================================
          of a Warrant that:
          ==================

                    (a)  The Warrants are transferable only on the registry
                    ===  ==================================================
          books of the Warrant Agent by the Registered Holder thereof in 
          ===============================================================
          person or by his, her or its attorney duly authorized in writing
          ================================================================
          and only if the Warrant Certificates representing such Warrants 
          =================================================================
          are surrendered at the office of the Warrant Agent, duly endorsed
          =================================================================
          or accompanied by a proper instrument of transfer satisfactory to
          =================================================================
          the Warrant Agent and the Company in their sole discretion, 
          ============================================================
          together with payment of any applicable transfer taxes; and
          ===========================================================

                    (b)  The Company and the Warrant Agent may deem and 
                    ===  ===============================================
          treat the person in whose name the Warrant Certificate is 
          ==========================================================
          registered as the Registered Holder and as the absolute, true and
          =================================================================
          lawful owner of the Warrants represented thereby for all 
          =========================================================
          purposes, and neither the Company nor the Warrant Agent shall be
          =================================================================
          affected by any notice or knowledge to the contrary, except as 
          ===============================================================
          otherwise expressly provided in Section 6 hereof.
          =================================================


                                      16
     <PAGE>

                    SECTION 19.  Cancellation of Warrant Certificates.  If
                                 ------------------------------------
                    =======================================================
          the Company shall purchase or acquire any Warrant or Warrants, 
          ================================================================
          the Warrant Certificate or Certificates evidencing the same shall
          =================================================================
          thereupon be delivered to the Warrant Agent and canceled by it 
          ===============================================================
          and retired.  The Warrant Agent shall also cancel the Warrant 
          ==============================================================
          Certificates following exercise of any or all of the Warrants 
          ==============================================================
          represented thereby or delivered to it for transfer, split-up, 
          ===============================================================
          combination or exchange.
          ========================

                    SECTION 20.  Warrant Agent.  (a)  Duties and 
                                 -------------        -----------
                    =============================================
          Liabilities.  The Warrant Agent hereby accepts the agency 
          -----------
          ==========================================================
          established by this Agreement and agrees to perform the same upon
          =================================================================
          the terms and conditions herein set forth, by all of which the 
          ===============================================================
          Company and the Registered Holders of the Warrants, by their 
          =============================================================
          acceptance thereof, shall be bound.  The Warrant Agent shall not,
          ================================================================
          by countersigning Warrant Certificates or by any other act 
          ===========================================================
          hereunder, be deemed to make any representations as to the 
          ===========================================================
          validity or authorization of the Warrants or the Warrant 
          =========================================================
          Certificates (except as to its countersignature thereon) or of 
          ===============================================================
          any securities or other property delivered upon exercise or 
          ============================================================
          repurchase of any Warrant, or as to the accuracy of the 
          ========================================================
          computation of the Purchase Price or exercise or repurchase of 
          ===============================================================
          any Warrant, or the correctness of the representations of the 
          ==============================================================
          Company made in the certificates that the Warrant Agent receives. 
          =================================================================
          The Warrant Agent shall not be accountable for the use or 
          ==========================================================
          application by the Company of the proceeds of the exercise of any
          =================================================================
          Warrant.  The Warrant Agent shall not have any duty to calculate
          =================================================================
          or determine any adjustments with respect to either the Purchase
          =================================================================
          Price or the kind and amount of shares or other securities or any
          =================================================================
          property receivable by Registered Holders upon the exercise or 
          ===============================================================
          repurchase of Warrants required from time to time and the Warrant
          =================================================================
          Agent shall have no duty or responsibility in determining the 
          ==============================================================
          accuracy or correctness of such calculation.  The Warrant Agent 
          ================================================================
          shall not be (a) liable for any recital or statement of fact 
          =============================================================
          contained herein or in the Warrant Certificates or for any action
          =================================================================
          taken, suffered or omitted by it in good faith in the belief that
          =================================================================
          any Warrant Certificate or any other documents or any signatures
          =================================================================
          are genuine or properly authorized, (b) responsible for any 
          ============================================================
          failure on the part of the Company to comply with any of its 
          =============================================================
          covenants and obligations contained in this Agreement or in the 
          ================================================================
          Warrant Certificates or (c) liable for any act or omission in 
          ==============================================================
          connection with this Agreement except for its own gross 
          ========================================================
          negligence or willful misconduct.  The Warrant Agent is hereby 
          ===============================================================
          authorized to accept instructions with respect to the performance
          =================================================================
          of its duties hereunder from the President, any Vice President or
          =================================================================
          the Secretary or Treasurer or an Assistant Treasurer of the 
          ============================================================
          Company and to apply to any such officer for instructions (which
          =================================================================
          instructions will be promptly given in writing when requested) 
          ===============================================================
          and the Warrant Agent shall not be liable for any action taken or
          ================================================================
          suffered to be taken by it in good faith in accordance with the 
          ================================================================
          instructions of any such officer; however, in its discretion, the
          =================================================================
          Warrant Agent may in lieu thereof accept other evidence of such 
          ================================================================
          or may require such further or additional evidence as it may deem
          =================================================================
          reasonable.  The Warrant Agent shall not be liable for any action
          =================================================================
          taken with respect to any matter in the event it requests 
          ==========================================================
          instructions from the Company as to that matter and does not 
          =============================================================
          receive such instructions within a reasonable period of time 
          =============================================================
          after the request therefor.
          ===========================

                    The Warrant Agent may execute and exercise any of the 
                    ======================================================
          rights and powers hereby vested in it or perform any duty 
          ==========================================================
          hereunder either itself or by or through its attorneys, agents or
          =================================================================


                                       17
     <PAGE>


          employees, and the Warrant Agent shall not be answerable or 
          ============================================================
          accountable for any act, default, neglect or misconduct of any 
          ===============================================================
          such attorneys, agents or employees, provided reasonable care has
                                               --------
          =================================================================
          been exercised in the selection and in the continued employment 
          =================================================================
          of any such attorney, agent or employee.  The Warrant Agent shall
          =================================================================
          not be under any obligation or duty to institute, appear in or 
          ===============================================================
          defend any action, suit or legal proceeding in respect hereof, 
          ===============================================================
          unless first indemnified to its satisfaction, but this provision
          =================================================================
          shall not affect the power of the Warrant Agent to take such 
          =============================================================
          action as the Warrant Agent may consider proper, whether with or
          =================================================================
          without such indemnity.  The Warrant Agent shall promptly notify
          =================================================================
          the Company in writing of any claim made or action, suit or 
          ============================================================
          proceeding instituted against it arising out of or in connection
          =================================================================
          with this Agreement.
          ====================

                    The Company will perform, execute, acknowledge and 
                    ===================================================
          deliver or cause to be delivered all such further acts 
          ========================================================
          instruments and assurances as are consistent with this Agreement
          ================================================================
          and as may reasonably be required by the Warrant Agent in order 
          ================================================================
          to enable it to carry out or perform its duties under this 
          ===========================================================
          Agreement.
          ==========

                    The Warrant Agent shall act solely as agent of the 
                    ===================================================
          Company hereunder.  The Warrant Agent shall not be liable except
          =================================================================
          for the failure to perform such duties as are specifically set 
          ===============================================================
          forth herein, and no implied covenants or obligations shall be 
          ===============================================================
          read into this Agreement against the Warrant Agent, whose duties
          =================================================================
          and obligations shall be determined solely by the express 
          ==========================================================
          provisions hereof.
          ==================

                    (b)  Right to Consult Counsel.  The Warrant Agent may 
                         ------------------------
                    ===  =================================================
          at any time consult with legal counsel acceptable to the Company
          =================================================================
          (who may be legal counsel for the Company), and the opinion or 
          ===============================================================
          advice of such counsel shall be full and complete authorization 
          ================================================================
          and protection to the Warrant Agent and the Warrant Agent shall 
          ================================================================
          incur no liability or responsibility to the Company or to any 
          ==============================================================
          Registered Holder for any action taken, suffered or omitted by it
          =================================================================
          in good faith in accordance with the opinion or advice of such 
          ===============================================================
          counsel.
          ========

                    (c)  Compensation; Indemnification.  The Company agrees
                         -----------------------------
                    ===  ==================================================
          promptly to pay the Warrant Agent from time to time, on demand of
          =================================================================
          the Warrant Agent, compensation for its services hereunder as the
          =================================================================
          Company and the Warrant Agent may agree from time to time, and to
          =================================================================
          reimburse it for reasonable expenses and counsel fees incurred in
          =================================================================
          connection with the execution and administration of this 
          ==========================================================
          Agreement, and further agrees to indemnify the Warrant Agent and
          ================================================================
          save it harmless against any losses, liabilities or expenses 
          =============================================================
          arising out of or in connection with the acceptance and 
          ========================================================
          administration of this Agreement, including the costs and 
          ==========================================================
          expenses of investigating or defending any claim of such 
          =========================================================
          liability, except that the Company shall have no liability 
          ===========================================================
          hereunder to the extent that any such loss, liability or expense
          =================================================================
          results from the Warrant Agent's own gross negligence or willful
          =================================================================
          misconduct.  The obligations of the Company under this Section 
          ===============================================================
          shall survive the exercise and the expiration of the Warrants and
          =================================================================
          the resignation or removal of the Warrant Agent.
          ================================================

                    (d)  No Restrictions on Actions.  The Warrant Agent and
                         --------------------------
                    ===  ==================================================
          any stockholder, director, officer or employee of the Warrant 
          ==============================================================
          Agent may buy, sell or deal in any of the Warrants or other 
          ============================================================


                                      18
     <PAGE>


          securities of the Company or become pecuniarily interested in 
          ==============================================================
          transactions in which the Company may be interested, or contract
          ================================================================
          with or lend money to the Company or otherwise act as fully and 
          ================================================================
          freely as though it were not the Warrant Agent under this 
          ==========================================================
          Agreement.  Nothing herein shall preclude the Warrant Agent from
          =================================================================
          acting in any other capacity for the Company or for any other 
          ==============================================================
          legal entity.
          =============

                    (e)  Discharge or Removal; Replacement Warrant Agent. 
                         -----------------------------------------------
                    ===  ==================================================
          The Warrant Agent may resign from its position as such and be 
          ==============================================================
          discharged from all further duties and liabilities hereunder 
          ==============================================================
          (except liability arising as a result of the Warrant Agent's own
          =================================================================
          gross negligence or willful misconduct), after giving one month's
          =================================================================
          prior written notice to the Company.  The Company may remove the
          =================================================================
          Warrant Agent upon one month's written notice specifying the date
          =================================================================
          when such discharge from all further duties and liabilities 
          =============================================================
          hereunder, except as aforesaid.  The Warrant Agent or the Company
          =================================================================
          shall cause to be mailed to each Registered Holder of a Warrant a
          =================================================================
          copy of said notice of resignation or notice of removal, as the 
          ================================================================
          case may be.  Upon such resignation or removal the Company shall
          =================================================================
          appoint in writing a new warrant agent.  If the Company shall 
          ==============================================================
          fail to make such appointment within a period of 30 calendar days
          =================================================================
          after it has been notified in writing of such resignation by the
          =================================================================
          resigning Warrant Agent or after such removal, then the resigning
          =================================================================
          Warrant Agent or the Registered Holder of any Warrant may apply 
          ================================================================
          to any court of competent jurisdiction for the appointment of a 
          ================================================================
          new warrant agent.  Pending appointment of a successor to the 
          ==============================================================
          original Warrant Agent, either by the Company or by such a court,
          =================================================================
          the duties of the Warrant Agent shall be carried out by the 
          ============================================================
          Company.  Any new warrant agent, whether appointed by the Company
          =================================================================
          or by such a court, shall be a bank or trust company doing 
          ===========================================================
          business under the laws of the United States or any state 
          ==========================================================
          thereof, in good standing and having a combined capital and 
          ============================================================
          surplus of not less than $25,000,000.  The combined capital and 
          ================================================================
          surplus of any such new warrant agent shall be deemed to be the 
          ================================================================
          combined capital and surplus as set froth in the most recent 
          =============================================================
          annual report of its condition published by such warrant agent 
          ===============================================================
          prior to its appointment, provided that such reports are 
                                    --------
          =========================================================
          published at least annually pursuant to law or the requirements 
          ================================================================
          of a federal or state supervising or examining authority.  After
          =================================================================
          acceptance in writing of such appointment by the new warrant 
          =============================================================
          agent, it shall be vested with the same powers, rights, duties 
          ===============================================================
          and responsibilities as if it had been originally named herein as
          =================================================================
          the Warrant Agent, without any further assurance, conveyance, act
          =================================================================
          or deed; however, the original Warrant Agent shall in all events
          ================================================================
          deliver and transfer to the successor Warrant Agent all property,
          =================================================================
          if any, at the time held hereunder by the original Warrant Agent
          ================================================================
          and if for any reason it shall be necessary or expedient to 
          ============================================================
          execute and deliver any further assurance, conveyance, act or 
          ==============================================================
          deed, the same shall be done at the expense of the Company and 
          ===============================================================
          shall be legally and validly executed and delivered by the 
          ===========================================================
          resigning or removed Warrant Agent.  Not later than the effective
          =================================================================
          date of any such appointment, the Company shall file notice 
          ============================================================
          thereof with the resigning or removed Warrant Agent and shall 
          ==============================================================
          forthwith cause a copy of such notice to be mailed to each 
          ===========================================================
          Registered Holder of a Warrant.  Failure to give any notice 
          ============================================================
          provided for in this paragraph (e), however, or any defect 
          ===========================================================
          therein, shall not affect the legality or validity of the 
          ==========================================================
          resignation of the Warrant Agent or the appointment of a new 
          =============================================================
          warrant agent, as the case may be.
          ==================================


                                      19
     <PAGE>

                    (f)  Successor Warrant Agent.  Any corporation into 
                         -----------------------
                    ===  ===============================================
          which the Warrant Agent or any new warrant agent may be merged, 
          ================================================================
          or any corporation resulting from any consolidation to which the
          =================================================================
          Warrant Agent or any new warrant agent shall be a party, shall be
          =================================================================
          a successor Warrant Agent under this Agreement without any 
          ===========================================================
          further act, provided that such corporation would be eligible for
                       --------
          =================================================================
          appointment as successor to the Warrant Agent under the 
          ========================================================
          provisions of paragraph (e) above.  Any such successor Warrant 
          ===============================================================
          Agent shall promptly cause notice of it succession as Warrant 
          ==============================================================
          Agent to be mailed to each Registered Holder of a Warrant.
          ==========================================================

                    SECTION 21.  Waivers; Amendments.  No failure or delay
                                 -------------------
                    ===========
          of the Registered Holders or any of them in exercising any right
          or power under this Agreement or the Warrants shall operate as a
          waiver thereof, nor shall any single or partial exercise of any
          such right or power, or any abandonment or discontinuance of
          steps to enforce such a right or power preclude any other or
          further exercise thereof or the exercise of any other right or
          power.  The rights and remedies of the Registered Holders are
          cumulative and not exclusive of any rights or remedies that they
          would otherwise have.  The [provisions of this Agreement ]Warrant
                                                                    =======
          Agent and the [Warrants may be amended, modified or waived with 
          =====
          (and only with) the written consent of ]the Company and the
          Registered Holders of Company may by supplemental agreement make
                                ===========================================
          any changes or corrections in this Agreement (a) that they shall
          =================================================================
          deem appropriate to cure any ambiguity or to correct any 
          =========================================================
          defective or inconsistent provisions or manifest mistake or error
          =================================================================
          herein contained; or (b) that they may deem necessary or 
          =========================================================
          desirable and which shall not adversely affect the interests of 
          ================================================================
          the holders of UNS Warrant Certificates [representing more than 
          =================
          50% of the Warrants then outstanding;] provided, however, that 
                                                 --------  -------
                                                                    =====
          this Agreement shall not otherwise be amended, modified or waived
          =================================================================
          except with the consent in writing of the Company and the 
          ===========================================================
          Registered Holders of Warrant Certificates representing more than
          =================================================================
          50% of the Warrants then outstanding; and  provided, further, 
                                                     -----------------
          =============================================================
          that no change in the number or kind of the securities
          purchasable upon the exercise of any Warrant, or the Purchase
          Price, or the Warrant Expiration Date, and no amendment, waiver
          or modification of the provisions of this Section 18 or of
          Section 8 or 10, shall be made without the written consent of the
          Registered Holders of all Warrants then outstanding, other than
          such adjustments as are contemplated by the provisions of
          Sections 8 and 10.

                    In the event of any such amendment, modification or
          waiver, the [Company ]Warrant Agent shall give prompt notice 
                                =============
          thereof to all Registered Holders and, if appropriate, notation
          thereof shall be made on all Warrant Certificates thereafter
          surrendered for registration of transfer or exchange.

                    No notice or demand on the Company in any case shall
          entitle the Company to any other or future notice or demand in
          similar or other circumstances.

                    SECTION [18] 22.  Notice of Certain Events.  In case at
                                 ==   ------------------------
          any time:


                                      20
      <PAGE>

                    (a)  the Company shall pay any dividend upon, or make
               any distribution in respect of, its Common Stock that would
               give rise to an adjustment pursuant to Section 8(e);

                    (b)  the Company shall offer for subscription to
               holders of its Common Stock any additional shares of stock
               of any class or other rights;

                    (c)  there shall be any capital reorganization, or
               reclassification of the capital stock of the Company, or
               consolidation or merger of the Company with or into, or
               sale, transfer or lease of all or substantially all of its
               property to, another entity; or

                    (d)  there shall be a voluntary or involuntary
               dissolution, liquidation or winding up of the Company;

          then, in any one or more of said cases, the Company shall give
          notice to the Warrant Agent, and the Warrant Agent shall give 
                        ================================================
          notice to the Registered Holders, of the date on which (i) the  
          =============                   =
          books of the Company shall close or a record shall be taken for
          such dividend, distribution or subscription rights or (ii) such
          reorganization, reclassification, consolidation, merger, sale,
          transfer, lease, dissolution, liquidation or winding up shall
          take place, as the case may be.  Such notice to Registered 
                                                       ==============
          Holders shall be given not less than 10 days prior to the record
          =======
          date or the date on which the books of the Company are to be
          closed in respect thereto in the case of an action specified in
          clause (i) and at least 20 days prior to the action in question
          (or as soon as the Company has knowledge of the action) in the
          case of an action specified in clause (ii).

                    SECTION [19.] 23.  Notices.  All notices, requests, 
                                  ===  -------
          consents and other communications hereunder shall be in writing
          and shall be deemed to have been made when delivered or mailed
          first class, registered or certified mail, postage prepaid [as
          follows: if] to a Registered Holder[,] at the address of such
          holder as shown on the registry books maintained by the Company
          [; if] and to the Company[, at] or the Warrant Agent, as follows:
                 ===                      =================================

               To the Company:
               ===============

                         Tucson Electric Power Company
                         [,] 220 West Sixth Street
                         [,] Tucson, Arizona 85702
                         [,] Attention: Treasurer

               [,] To the Warrant Agent:
                   =====================

                         The Bank of New York
                         ====================
                         P.O. Box 11002
                         ==============
                         Church Street Station
                         =====================


                                      21
     <PAGE>

                         New York, New York 10286-1281
                         =============================


          or at such other address as may have been furnished to the 
          [Registered Holders ]party giving or making such notice in 
                               ==================================
          writing [by the Company].

                    SECTION [20] 24.  Governing Law.  This Agreement shall
                                 ==   -------------
          be governed by and construed in accordance with the laws of the
          State of Arizona, without reference to principles of conflict of
          laws.

                    SECTION [21] 25.  Binding Effect.  This Agreement shall
                                 ==   --------------
          be binding upon and inure to the benefit of the Company and its
          successors and assigns, and the Registered Holders from time to
          time of Warrant Certificates.  Each Registered Holder, by its
          acceptance of a Warrant Certificate, agrees to be bound by the
          provisions of this Agreement as if it were a party hereto. 
          Nothing in this Agreement is intended or shall be construed to
          confer upon any other person any right, remedy or claim, in
          equity or at law or to impose upon any other person any duty,
          liability or obligation.

                    SECTION [22.] 26.  Severability.  In case any one or 
                                  ===  ------------
          more of the provisions contained in this Agreement or the Warrant
          Certificates issued hereunder shall be invalid, illegal or
          unenforceable in any respect, the validity, legality and
          enforceability of the remaining provisions contained herein and
          therein shall not in any way be affected or impaired thereby. 
          The parties shall endeavor in good faith negotiations to replace
          the invalid, illegal or unenforceable provisions with valid
          provisions the economic effect of which comes as close as
          possible to that of the invalid, illegal or unenforceable
          provisions.

                    SECTION [23.] 27.  Counterparts.  This Agreement may be
                                  ===  ------------
          executed in several counterparts, which taken together shall
          constitute a single document.


                                      22
     <PAGE>


                    IN WITNESS WHEREOF, the parties hereto have caused this
          Agreement to be duly executed as of the date first above written.

                                        [TUCSON ELECTRIC POWER COMPANY,


          by
             ------------------------------
          Susan R. Wallach
          Vice President and Treasurer

          CHRYSLER CAPITAL] UNISOURCE ENERGY CORPORATION,
                            ================


                                        by
                                            ------------------------------
                                             Name:
                                             Title:

                                        THE BANK OF NEW YORK,
                                        =====================
                                         as Warrant Agent [CILCORP LEASE 
                                        =================
          MANAGEMENT INC.]


                                        by
                                            ------------------------------
                                             Name:
                                             Title:


                                      23
      <PAGE>


                                                         [MWR CAPITAL INC.,


          by
             ------------------------------
          Name:
          Title:

          NORTHERN LEASING COMPANY, INC.


          by 
             ------------------------------
          Name:
          Title:


          U S WEST FINANCIAL SERVICES, INC.


          by 
             ------------------------------
          Name:
          Title:

          PHILIP MORRIS CAPITAL CORPORATION


          by 
             ------------------------------
          Name:
          Title:]
          EXHIBIT A

          [INITIAL REGISTERED HOLDERS


          Name and Address Number of Warrants

          Chrysler Capital Corporation 2,131,244
          225 High Ridge Road
          Stamford, Connecticut 06905

          CILCORP Lease Management, Inc. 895,115
          300 Hamilton Boulevard (Suite 300)
          Peoria, Illinois 61602



                                      A-1
     <PAGE>


          MWR Capital Inc. 852,491
          666 Grand Avenue
          Des Moines, Iowa 50309

          Northern Leasing Company, Inc. 1,278,742
          c/o PacifiCorp Financial
          Services,, Inc.
          825 NE - Multnomah Street (Suite 775)
          Portland, Oregon 97232

          Philip Morris Capital Corporation 5,191,693
          800 Westchester Avenue
          Rye Brook, New York 10573-1301

          U S WEST Financial Services, Inc. 1,704,993
          One Canterbury Green (4th Floor)
          Stamford, Connecticut 06901


          EXHIBIT B]


                        [Form of 1999 UNS Warrant Certificate]
                        --------------------------------------
                                 ========

          No. W      - 1999                                        Warrants
               ------------                               --------
                     ======

                                 Warrant Certificate
                                 -------------------


             [TUCSON ELECTRIC POWER COMPANY] UNISOURCE ENERGY CORPORATION
                                            ============================

                    THIS CERTIFIES THAT                             , or
          its registered assigns, is the registered owner (the "Registered
          Holder") of the number of Warrants set forth above, each of which
          entitles the owner thereof to purchase from [Tucson Electric
          Power Company] UniSource Energy Corporation (the "Company') at 
                         ============================
          any time prior to 4:00 p.m. (Tucson, Arizona time) on[, 2002]
          March 15, 1999 , at the principal office of the Company, at 220 
          ==============
          West Sixth Street, Tucson, Arizona 85702, one fully paid and
          nonassessable share of the Common Stock, without par value
          ("Common Stock"), of the Company at a purchase price of [$3.20]
          $16.00 per share (the "Purchase Price") upon presentation and 
          ======
          surrender of this Warrant Certificate with the Form of Election
          to Purchase duly executed, together with payment in cash, or by
          official bank or certified check made payable to the Company, or
          by wire transfer, of an amount in lawful money of the United
          States of America equal to the applicable Purchase Price.  The
          number of Warrants evidenced by this Warrant Certificate (and the
          number of shares of Common Stock that may be purchased upon
          exercise thereof) set forth above, and the Purchase Price per


                                      A-2
     <PAGE>


          share set forth above, are the number and Purchase Price as of
          [1992]         , 1999, based on the shares of Common Stock as 
                ---------
                ===============
          constituted at such date.  As provided in the Warrant Agreement
          referred to below, upon the happening of certain events, (a) the
          Purchase Price and the number of shares of Common Stock that may
          be purchased upon the exercise of the Warrants evidenced by this
          Warrant Certificate are subject to modification and adjustment
          and (b) the registered holder of the Warrants evidenced by this
          Warrant Certificate may require the redemption thereof.

                    This Warrant Certificate is subject to all of the terms
          and conditions of a Warrant Agreement dated as of 
          [              , 1992]       , 1998 (the "Warrant Agreement"), 
           --------------       =============
          between the Company and the [initial registered holders] Warrant
                                                                   ======
          Agent.  The Warrant Agreement is hereby incorporated herein by 
          =====
          reference and made a part hereof.  Reference is hereby made to
          the Warrant Agreement for a full description of the rights,
          limitations of rights, obligations, duties and immunities
          thereunder of the Company and the registered holders of the
          Warrant Certificates.  Copies of the Warrant Agreement are on
          file at the office of the Company referred to above.

                    This Warrant Certificate, with or without other Warrant
          Certificates, upon surrender at the [principal] office of the 
          [Company] Warrant Agent, may be exchanged for another Warrant 
                    =============
          Certificate or Warrant Certificates evidencing Warrants entitling
          the Registered Holder to purchase a like aggregate number of
          shares of Common Stock as the Warrants evidenced by the Warrant
          Certificate or Warrant Certificates surrendered shall have
          entitled the Registered Holder to purchase.  If this Warrant
          Certificate shall be exercised or redeemed in part, the
          Registered Holder shall be entitled to receive upon surrender
          hereof another Warrant Certificate or Warrant Certificates for
          the number of whole Warrants not exercised.

                    If the Warrants evidenced by this Warrant Certificate
          remain unexercised or unredeemed at the expiration of the period
          during which Warrants are exercisable, as set forth in the first
          paragraph hereof, such Warrants shall thereupon become void and
          all rights of the Registered Holder hereunder and under the
          Warrant Agreement in respect of such Warrants shall cease.

                    No fractional Warrants will be issued upon any
          adjustment pursuant to Section 8 or 10 of the Warrant Agreement
          and no fractional shares of Common Stock will be issued upon the
          exercise of any Warrant or Warrants evidenced hereby.  With
          respect to any fraction of a Warrant called for in the aggregate
          Warrant position of the Registered Holder upon any adjustment
          pursuant to Section 8 or 10 of the Warrant Agreement or any
          fraction of a share of Common Stock called for given the
          aggregate number of shares issuable upon any exercise by the
          Registered Holder of Warrants, such fraction shall be rounded to
          the nearest whole number (.50 being rounded upward).

                    Until the Warrant or Warrants evidenced by this Warrant
          Certificate are exercised as provided in the Warrant Agreement,
          no Registered Holder of this Warrant Certificate, as such, shall
          be entitled to vote or receive dividends or be deemed for any


                                      A-3
     <PAGE>


          purpose the holder of Common Stock or of any other securities of
          the Company that may at any time be issuable on the exercise
          hereof, nor shall anything contained in the Warrant Agreement or
          herein be construed to confer upon the Registered Holder hereof,
          as such, any of the rights of a shareholder of the Company or any
          right to vote upon any matter submitted to shareholders at any
          meeting thereof, or to give or withhold consent to any corporate
          action (whether upon any recapitalization, issue of stock,
          reclassification of stock, change of par value, consolidation,
          merger, conveyance, or otherwise) or, except as provided in the
          Warrant Agreement, to receive notice of meetings, or to receive
          dividends or subscription rights or otherwise.



                                      A-4
          <PAGE>



                    [WITNESS, the signature of the proper officers of the
          Company and its corporate seal.] This Warrant Certificate shall 
                                           ===============================
          not be valid for any purpose until it shall have been 
          ======================================================
          countersigned by the Warrant Agent.
          ===================================


          Dated as of


                                        [TUCSON ELECTRIC POWER COMPANY,] 
          UNISOURCE ENERGY CORPORATION
          ============================

                                        by
                                           --------------------------
                                             [Susan R. Wallach] Name:
                                                                =====
                                             [Vice President and ]Title:
                                                                  ======

          [Treasurer] Countersigned:
                      ==============


          [Attest:] THE BANK OF NEW YORK
                    ====================
            as Warrant Agent
          ==================



          by:
          ===  -------------------
          Name:
          Title:


                                      A-5

      <PAGE>


                                      ASSIGNMENT


                    (To be executed by the Registered Holder if such
                    Registered Holder desires to register the transfer of
                    the Warrant Certificate.)


          FOR VALUE RECEIVED,                           hereby sells, 
                              -------------------------
          assigns and transfers unto                           this Warrant
                                     -------------------------
          Certificate, together with all right, title and interest therein,
          and does hereby irrevocably constitute and appoint             
                                                               ----------- 
          Attorney to transfer this Warrant Certificate on the books of 
          [Tucson Electric Power Company] the Warrant Agent with full power
                                          =================
          of substitution.

          Dated:                     .
                 --------------------

          Signature:
                                        ----------------------------
          Signature Guaranteed:
                                        ----------------------------


                                        NOTICE

                    The signature on the foregoing Assignment must conform
          in all respects to the name of the Registered Holder as specified
          on the face of this Warrant Certificate.


                                      A-6
          <PAGE>


                                 ELECTION TO PURCHASE


                    (To be executed if the Registered Holder desires to
                    exercise any 1999 UNS Warrant represented by this 
                                 ========
                    Warrant Certificate.)


          TO:  [TUCSON ELECTRIC POWER COMPANY] UNISOURCE ENERGY CORPORATION
                                               ============================

                    The undersigned hereby irrevocably elects to exercise  
                                      1999 UNS Warrants represented by this
          ---------------------------
          ====================================
          Warrant Certificate to purchase the shares of Common Stock
          issuable upon the exercise of such number of Warrants and
          requests that certificates for such shares be issued in the name
          of:



          ----------------------------------------------------------------
                      (Print name, address and social security 
                             or other identifying number)

          and in the following denominations:



          ----------------------------------------------------------------
          ================================================================


          Dated:              .
                  ------------


          Signature:
                                        ------------------------------
                                             (Signature must conform in all
                                             respects to the name of the
                                             Registered Holder as specified
                                             on the face of this Warrant
                                             Certificate)




          Signature Guaranteed:
                                        ------------------------------


                                      A-7   
          <PAGE>


                                  NOTICE OF EXERCISE


                    (To be executed if the Registered Holder desires to
                    have redeemed any 1999 UNS Warrant represented by this
                                      ========
                    Warrant Certificate.)


          TO:  [TUCSON ELECTRIC POWER COMPANY] UNISOURCE ENERGY CORPORATION
                                               ============================

                    The undersigned hereby elects to have redeemed 
                                                                   -------
          Warrants represented by this Warrant Certificate and requests
          that the redemption price for such Warrants be paid to:




          ----------------------------------------------------------------
                      (Print name, address and social security 
                             or other identifying number)

                    The undersigned has the right to revoke this Notice of
          Exercise as provided in Section 10(b) of the Warrant Agreement.




          Dated:              .
                  ------------



          Signature:
                                        ------------------------------
                                             (Signature must conform in all
                                             respects to the name of the
                                             Registered Holder as specified
                                             on the face of this Warrant
                                             Certificate)




          Signature Guaranteed:
                                        ------------------------------


                                      A-8
          <PAGE>


                                                                  EXHIBIT B
                                                                  =========


                        [Form of 2000 UNS Warrant Certificate]
                        --------------------------------------
                        ======================================

          No. W      - 2000                                        Warrants
               ------                                     --------
          =================                               =================

                                 Warrant Certificate
                                 -------------------
                                 ===================


                             UNISOURCE ENERGY CORPORATION
                             ============================

                    THIS CERTIFIES THAT                             , or 
                    =====================================================
          its registered assigns, is the registered owner (the "Registered
          =================================================================
          Holder") of the number of Warrants set forth above, each of which
          =================================================================
          entitles the owner thereof to purchase from UniSource Energy 
          =============================================================
          Corporation (the "Company') at any time prior to 4:00 p.m. 
          ===========================================================
          (Tucson, Arizona time) on December 15, 2000, at the principal 
          ==============================================================
          office of the Company, at 220 West Sixth Street, Tucson, Arizona
          ================================================================
          85702, one fully paid and nonassessable share of the Common 
          ============================================================
          Stock, without par value ("Common Stock"), of the Company at a 
          ===============================================================
          purchase price of $16.00 per share (the "Purchase Price") upon 
          ===============================================================
          presentation and surrender of this Warrant Certificate with the 
          ================================================================
          Form of Election to Purchase duly executed, together with payment
          =================================================================
          in cash, or by official bank or certified check made payable to 
          ================================================================
          the Company, or by wire transfer, of an amount in lawful money of
          ================================================================
          the United States of America equal to the applicable Purchase 
          ==============================================================
          Price.  The number of Warrants evidenced by this Warrant 
          =========================================================
          Certificate (and the number of shares of Common Stock that may be
          =================================================================
          purchased upon exercise thereof) set forth above, and the 
          ==========================================================
          Purchase Price per share set forth above, are the number and 
          =============================================================
          Purchase Price as of          , 2000, based on the shares of 
                               ---------
          =============================================================
          Common Stock as constituted at such date.  As provided in the 
          ==============================================================
          Warrant Agreement referred to below, upon the happening of 
          ===========================================================
          certain events, (a) the Purchase Price and the number of shares 
          ================================================================
          of Common Stock that may be purchased upon the exercise of the 
          ===============================================================
          Warrants evidenced by this Warrant Certificate are subject to 
          ==============================================================
          modification and adjustment and (b) the registered holder of the
          ================================================================
          Warrants evidenced by this Warrant Certificate may require the 
          ===============================================================
          redemption thereof.
          ===================

                    This Warrant Certificate is subject to all of the terms
                    =======================================================
          and conditions of a Warrant Agreement dated as of          , 1998
                                                            ---------
          =================================================================
          (the "Warrant Agreement"), between the Company and the Warrant 
          ===============================================================
          Agent.  The Warrant Agreement is hereby incorporated herein by 
          ===============================================================
          reference and made a part hereof.  Reference is hereby made to 
          ===============================================================
          the Warrant Agreement for a full description of the rights, 
          ============================================================
          limitations of rights, obligations, duties and immunities 
          ==========================================================
          thereunder of the Company and the registered holders of the 
          ============================================================
          Warrant Certificates.  Copies of the Warrant Agreement are on 
          ==============================================================
          file at the office of the Company referred to above.
          ====================================================

                    This Warrant Certificate, with or without other Warrant
                    =======================================================
          Certificates, upon surrender at the office of the Warrant Agent,
          =================================================================
          may be exchanged for another Warrant Certificate or Warrant 
          ============================================================
          Certificates evidencing Warrants entitling the Registered Holder
          =================================================================


                                      B-1
     <PAGE>


          to purchase a like aggregate number of shares of Common Stock as
          =================================================================
          the Warrants evidenced by the Warrant Certificate or Warrant 
          =============================================================
          Certificates surrendered shall have entitled the Registered 
          ============================================================
          Holder to purchase.  If this Warrant Certificate shall be 
          ==========================================================
          exercised or redeemed in part, the Registered Holder shall be 
          ==============================================================
          entitled to receive upon surrender hereof another Warrant 
          ==========================================================
          Certificate or Warrant Certificates for the number of whole 
          =============================================================
          Warrants not exercised.
          =======================

                    If the Warrants evidenced by this Warrant Certificate 
                    ======================================================
          remain unexercised or unredeemed at the expiration of the period
          =================================================================
          during which Warrants are exercisable, as set forth in the first
          =================================================================
          paragraph hereof, such Warrants shall thereupon become void and 
          ================================================================
          all rights of the Registered Holder hereunder and under the 
          ============================================================
          Warrant Agreement in respect of such Warrants shall cease.
          ==========================================================

                    No fractional Warrants will be issued upon any 
                    ===============================================
          adjustment pursuant to Section 8 or 10 of the Warrant Agreement 
          ================================================================
          and no fractional shares of Common Stock will be issued upon the
          ================================================================
          exercise of any Warrant or Warrants evidenced hereby.  With 
          =============================================================
          respect to any fraction of a Warrant called for in the aggregate
          ================================================================
          Warrant position of the Registered Holder upon any adjustment 
          ==============================================================
          pursuant to Section 8 or 10 of the Warrant Agreement or any 
          ============================================================
          fraction of a share of Common Stock called for given the 
          =========================================================
          aggregate number of shares issuable upon any exercise by the 
          =============================================================
          Registered Holder of Warrants, such fraction shall be rounded to
          ================================================================
          the nearest whole number (.50 being rounded upward).
          ====================================================

                    Until the Warrant or Warrants evidenced by this Warrant
                    =======================================================
          Certificate are exercised as provided in the Warrant Agreement, 
          ================================================================
          no Registered Holder of this Warrant Certificate, as such, shall
          =================================================================
          be entitled to vote or receive dividends or be deemed for any 
          ==============================================================
          purpose the holder of Common Stock or of any other securities of
          =================================================================
          the Company that may at any time be issuable on the exercise 
          =============================================================
          hereof, nor shall anything contained in the Warrant Agreement or
          ================================================================
          herein be construed to confer upon the Registered Holder hereof,
          =================================================================
          as such, any of the rights of a shareholder of the Company or any
          =================================================================
          right to vote upon any matter submitted to shareholders at any 
          ===============================================================
          meeting thereof, or to give or withhold consent to any corporate
          =================================================================
          action (whether upon any recapitalization, issue of stock, 
          ===========================================================
          reclassification of stock, change of par value, consolidation, 
          ===============================================================
          merger, conveyance, or otherwise) or, except as provided in the 
          ================================================================
          Warrant Agreement, to receive notice of meetings, or to receive 
          ================================================================
          dividends or subscription rights or otherwise.
          ==============================================


                                      B-2
     <PAGE>

                    This Warrant Certificate shall not be valid for any 
                    ====================================================
          purpose until it shall have been countersigned by the Warrant 
          ==============================================================
          Agent.
          ======


          Dated as of
          ===========


                                        UNISOURCE ENERGY CORPORATION
                                        ============================


                                        by
                                           --------------------------
                                        =============================
                                             Name:
                                             =====
                                             Title:
                                             ======

          Countersigned:
          ==============


          THE BANK OF NEW YORK
          ====================
            as Warrant Agent
          ==================



          by:
               -------------------
          ===  ===================
          Name:
          =====
          Title:
          ======


                                      B-3
          <PAGE>


                                      ASSIGNMENT
                                      ==========


                    (To be executed by the Registered Holder if such 
                    =================================================
                    Registered Holder desires to register the transfer of 
                    ======================================================
                    the Warrant Certificate.)
                    =========================


          FOR VALUE RECEIVED,                           hereby sells, 
                              -------------------------
          =============================================================
          assigns and transfers unto                           this Warrant
                                     -------------------------
          =================================================================
          Certificate, together with all right, title and interest therein,
          =================================================================
          and does hereby irrevocably constitute and appoint
                                                             -----------   
          ===============================================================
          Attorney to transfer this Warrant Certificate on the books of the
          =================================================================
          Warrant Agent with full power of substitution.
          ==============================================

          Dated:                     .
                 --------------------
          ============================

          Signature:
          ==========                    ----------------------------
                                        ============================

          Signature Guaranteed:
          =====================         ----------------------------
                                        ============================


                                        NOTICE
                                        ======

                    The signature on the foregoing Assignment must conform
                    =======================================================
          in all respects to the name of the Registered Holder as specified
          =================================================================
          on the face of this Warrant Certificate.
          ========================================


                                      B-4

          <PAGE>


                                 ELECTION TO PURCHASE
                                 ====================


                    (To be executed if the Registered Holder desires to 
                    ====================================================
                    exercise any 2000 UNS Warrant represented by this 
                    ==================================================
                    Warrant Certificate.)
                    =====================


          TO:  UNISOURCE ENERGY CORPORATION
          ===  ============================

                    The undersigned hereby irrevocably elects to exercise   
                    =======================================================
                                    2000 UNS Warrants represented by this 
          -------------------------
          ================================================================
          Warrant Certificate to purchase the shares of Common Stock 
          ===========================================================
          issuable upon the exercise of such number of Warrants and 
          ==========================================================
          requests that certificates for such shares be issued in the name
          =================================================================
          of:
          ===



          ----------------------------------------------------------------
          ================================================================
                      (Print name, address and social security 
                      =========================================
                             or other identifying number)
                             ============================

          and in the following denominations:
          ===================================



          ----------------------------------------------------------------
          ================================================================


          Dated:              .
                  ------------
          =====================


          Signature:
          =========                     ------------------------------
                                        ==============================
                                             (Signature must conform in all
                                             ==============================
                                             respects to the name of the 
                                             ============================
                                             Registered Holder as specified
                                             ==============================
                                             on the face of this Warrant 
                                             ============================
                                             Certificate)
                                             =============


          Signature Guaranteed:
          =====================         ------------------------------
                                        ==============================


                                      B-5

          <PAGE>


                                  NOTICE OF EXERCISE
                                  ==================


                    (To be executed if the Registered Holder desires to 
                    ====================================================
                    have redeemed any 2000 UNS Warrant represented by this
                    ======================================================
                    Warrant Certificate.)
                    =====================


          TO:  UNISOURCE ENERGY CORPORATION
          ===  ============================

                    The undersigned hereby elects to have redeemed        
                                                                   ------
                    =======================================================
          Warrants represented by this Warrant Certificate and requests 
          ==============================================================
          that the redemption price for such Warrants be paid to:
          =======================================================




          ----------------------------------------------------------------
          ================================================================
                      (Print name, address and social security 
                      =========================================
                             or other identifying number)
                             ============================

                    The undersigned has the right to revoke this Notice of
                    =======================================================
          Exercise as provided in Section 10(b) of the Warrant Agreement.
          ===============================================================




          Dated:              .
                  ------------
          =====================



          Signature:
          ==========                    ------------------------------
                                        ==============================
                                             (Signature must conform in all
                                             ==============================
                                             respects to the name of the 
                                             ============================
                                             Registered Holder as specified
                                             ==============================
                                             on the face of this Warrant 
                                             ============================
                                             Certificate)
                                             ============



          Signature Guaranteed:
          =====================         ------------------------------
                                        ==============================



                                      B-6



          <PAGE>


                                       PART II.

                        INFORMATION NOT REQUIRED IN PROSPECTUS

   
    
        
          ITEM 21. EXHIBITS.

    
               Reference is made to the Exhibit Index on page II-4 hereof.

    
                                     II-1

          <PAGE>


   
                                      SIGNATURES

                    Pursuant to the requirements of the Securities Act of
          1933, the Registrant has duly caused this Amendment No. 1 to the
          Registration Statement to be signed on its behalf by the
          undersigned, thereunto duly authorized, in the City of Tucson,
          State of Arizona on August 14, 1998.
    
                              UNISOURCE ENERGY CORPORATION


                              By:   /s/ Ira R. Adler
                                 ------------------------------------------
                                 IRA R. ADLER
                                 Executive Vice President 
                                 Principal Financial Officer

   
               Pursuant to the requirements of the Securities Act of 1933,
          this Amendment No. 1 to the Registration Statement has been
          signed by the following persons in the capacities and on the
          dates indicated.
    

   
          Date:     August 14, 1998      *James S. Pignatelli
                                        -----------------------------------
                                        James S. Pignatelli
                                        Chairman of the Board,
                                        President and
                                        Principal Executive Officer

          Date:     August 14, 1998     /s/Ira R. Adler
                                        -----------------------------------
                                        Ira R. Adler
                                        Executive Vice President, 
                                        Principal Financial 
                                        Officer and Director


          Date:     August 14, 1998     *Karen G. Kissinger
                                        -----------------------------------
                                        Karen G. Kissinger
                                        Principal Accounting Officer


          Date:             , 1998      -----------------------------------
                    --------            Elizabeth T. Bilby
                                        Director


          Date:     August 14, 1998     *Larry W. Bickle
                                        -----------------------------------
                                        Larry W. Bickle
                                        Director


          Date:     August 14, 1998     *Harold W. Burlingame
                                        -----------------------------------
                                        Harold W. Burlingame
                                        Director


          Date:     August 14, 1998     *Jose L. Canchola
                                        -----------------------------------
                                        Jose L. Canchola
                                        Director


          Date:     August 14, 1998     *John L. Carter
                                        -----------------------------------
                                        John L. Carter
                                        Director


          Date:             , 1998      -----------------------------------
                    --------            Daniel W.L. Fessler
                                        Director

                                    II-2

<PAGE>

          Date:     August 14, 1998     *John A. Jeter
                                        -----------------------------------
                                        John A. Jeter
                                        Director

          Date:     August 14, 1998     *R. B. O'Rielly
                                        -----------------------------------
                                        R. B. O'Rielly
                                        Director


          Date:     August 14, 1998     *Martha R. Seger
                                        -----------------------------------
                                        Martha R. Seger
                                        Director


          Date:     August 14, 1998     *H. Wilson Sundt
                                        -----------------------------------
                                        H. Wilson Sundt
                                        Director


                              By:  /s/ Ira R. Adler
                                   -----------------------------------
                                   IRA R. ADLER, as 
                                   Attorney-in-fact for each 
                                   of the persons indicated by an asterisk

    
                                    II-3

          <PAGE>


                                    EXHIBIT INDEX



          Exhibit No.         Description of Exhibit
          -----------         ----------------------
   
          *3(a)               --   Amended and Restated Articles of
                                   Incorporation (filed with the Commission
                                   on January 30, 1998 as Exhibit 2(a) to
                                   Registrant's Amendment No. 1 to Form 8-A
                                   and incorporated herein by reference
                                   thereto).

          *3(b)               --   Bylaws (filed with the Commission on
                                   December 23, 1997 as Exhibit 2(b) to
                                   Registrant's Form 8-A and incorporated
                                   herein by reference thereto).
    

          *4(a)               --   Form of Warrant Agreement relating to
                                   the UNS Warrants is contained in
                                   Appendix A to the Prospectus included in
                                   this Registration Statement.

          *4(b)               --   Form of Letter of Transmittal.

   
          *5(a)               --   Opinion of Dennis R. Nelson, Esq. (filed
                                   with the Commission on August 6, 1998
                                   as Exhibit 5(a) to the Registration
                                   Statement).

          *5(b) and 8         --   Opinion of Thelen Reid & Priest LLP
                                   (filed with the Commission on August 6,
                                   1998 as Exhibit 5(b) and 8 to the 
                                   Registration Statement).

          15(a)               --   Letter of Deloitte & Touche LLP
                                   regarding unaudited interim financial
                                   information

          15(b)               --   Letter of PricewaterhouseCoopers
                                   regarding unaudited interim financial
                                   information
    
          *23(a)              --   The Consents of Dennis R. Nelson and
                                   Thelen Reid & Priest LLP were contained
                                   in their opinions as Exhibit 5(a) and
                                   5(b), respectively.

   
           23(b)              --   The Consent of Deloitte & Touche LLP.

          *24                 --   Power of Attorney is contained at page
                                   II-4 of the previously filed
                                   Registration Statement.


          * Previously filed.
    

                                     II-4





                                                           Exhibit 15(a)




   UniSource Energy Corporation
   220 West Sixth Street
   Tucson, Arizona 85701



   Ladies and Gentlemen:

   We have made a review, in accordance with standards established by the
   American Institute of Certified Public Accountants, of the unaudited
   interim financial information of UniSource Energy Corporation and
   subsidiaries (the Company) for the periods ended March 31, 1997 and 
   June 30, 1997 as indicated in our reports dated February 23, 1998; because
   we did not perform an audit, we express no opinion on that information.

   We are aware that our reports referred to above, which were included in your
   Quarterly Reports on Form 10-Q for the quarters ended March 31, and 
   June 30, 1998, respectively are incorporated by reference in this 
   Pre-Effective Amendment No. 1 to Registration Statement No. 333-60809 
   of the Company on Form S-4.

   We also are aware that the aforementioned reports, pursuant to Rule 436(c)
   under the Securities Act of 1933, are not considered a part of the
   Registration Statement prepared or certified by an accountant or reports
   prepared or certified by an accountant within the meaning of Sections 7 and
   11 of that Act.


   /s/ Deloitte & Touche LLP

   Deloitte & Touche LLP

   Tucson, Arizona
   August 14, 1998




                                                           Exhibit 15(b)







          August 14, 1998



          Securities and Exchange Commission
          450 Fifth Street, N.W.
          Washington, D.C.  20549


          Ladies and Gentlemen:

          We are aware that UniSource Energy Corporation has included our
          reports dated May 5, 1998 and August 4, 1998 (issued pursuant to 
          the provisions of Statement on Auditing Standards No. 71) in the 
          Prospectus constituting part of its Pre-Effective Amendment No. 1 
          to the Registration Statement on Form S-4 (No. 333-60809) to be
          filed on or about August 14, 1998.  We are also aware of our
          responsibilities under the Securities Act of 1933.

          Yours very truly,

          /s/ PricewaterhouseCoopers LLP

          PricewaterhouseCoopers LLP

 



                                                           Exhibit 23(b)



          INDEPENDENT AUDITORS' CONSENT

          UNISOURCE ENERGY CORPORATION:


          We consent to the incorporation by reference in this Pre-Effective 
          Amendment No. 1 to Registration Statement No. 333-60809 of Unisource
          Energy Corporation on Form S-4 of our report dated February 23, 1998,
          appearing in the Annual Report on Form 10-K of Unisource Energy 
          Corporation, as amended by Form 10K/A, dated March 5, 1998, for the
          year ended December 31, 1997 and to the reference
          to us under the heading "Experts" in the Prospectus, which is a part
          of this Registration Statement.


          /s/ Deloitte & Touche LLP

          DELOITTE & TOUCHE LLP
          Tucson, Arizona
          August 4, 1998





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