UNISOURCE ENERGY CORP
S-3/A, 1998-08-17
ELECTRIC SERVICES
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          As filed with the Securities and Exchange Commission on August
          14, 1998
    
                                              Registration No. 333-31043-99
          =================================================================

                          SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C. 20549


                                   ---------------
   
                            PRE-EFFECTIVE AMENDMENT NO. 2
                                         TO
                                       FORM S-3
                                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 Other Jurisdiction of         (I.R.S. Employer
               Incorporation or Organization)          Identification No.)

                                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 Corporation       J. Anthony Terrell, Esq.
               220 West Sixth Street              Thelen Reid & Priest LLP
               Tucson, Arizona  85701                40 West 57th Street
                    (520) 571-4000                     (212) 603-2000

           (Names, Addresses, Including Zip Codes, and Telephone Numbers, 
                     Including Area Codes, of Agents for Service)

                                   ---------------
               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 ON SUCH DATE AS THE COMMISSION,
          ACTING PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.



          <PAGE>


                                   EXPLANATORY NOTE

               On May 26, 1995, the shareholders of Tucson Electric Power
          Company ("TEP") voted to approve, and on January 1, 1998 there
          became effective, a statutory share exchange to change the
          corporate organization of TEP into a holding company structure
          whereby the outstanding shares of TEP common were exchanged, on a
          share-for-share basis, for shares of Common Stock (the "Common
          Stock") of UniSource Energy Corporation (the "Company"). This
          transaction resulted in TEP becoming a subsidiary of UniSource
          Energy Corporation which became the holder of all of the
          outstanding common stock of TEP, and the holders of outstanding
          TEP common stock became the holders of Common Stock.

               Pursuant to Rule 414(d) under the Securities Act, the
          Company hereby expressly adopts as its own, for all purposes of
          the Securities Act and the Exchange Act, this Registration
          Statement applicable to the Investment Plus Plan previously filed
          by TEP.


          <PAGE>


                       Subject to Completion August     , 1998
                                                    ----

          P R O S P E C T U S



                             UNISOURCE ENERGY CORPORATION

                                 INVESTMENT PLUS PLAN
                                   1,000,000 SHARES

                                     COMMON STOCK
                                  WITHOUT PAR VALUE

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


               The Investment Plus Plan (the "Plan") of UniSource Energy
          Corporation (the "Company") provides a simple and convenient
          method of investing in the Company's common stock, without par
          value (the "Common Stock"), without brokerage commissions or
          service charges.  Anyone, whether or not a current shareholder of
          the Company, is eligible to join the Plan (subject to certain
          legal restrictions).

               The Plan is designed to promote long-term ownership among
          investors who are committed to building their ownership of Common
          Stock over time.  Interested investors may enroll by making an
          Initial Investment of $250 or more.  Once enrolled, investors are
          eligible to make additional Optional Investments as frequently as
          twice per month of $50 or more to purchase additional shares of
          Common Stock.

               To enroll in the Plan, simply complete a Direct Stock
          Purchase Plan New Enrollment Form (an "Enrollment Form") and
          return it in the envelope provided.  Enrollment in the Plan is
          entirely voluntary and participants in the Plan may terminate
          their participation at any time.

          PARTICIPANTS IN THE PLAN MAY:

                .   Make optional investments by electronic funds transfer
                    (monthly)
                .   Make optional investments by check (twice monthly)
                .   Make gifts of shares from their Plan account
                .   Deposit share certificates for safekeeping
                .   Receive, upon written request, certificates of whole
                    shares credited to their Plan account
                .   Sell shares of stock credited to their Plan account,
                    paying a reduced commission

               Participants do not pay any fees for purchases of Common
          Stock under the Plan.  However, the Participant pays brokerage
          commissions and any applicable taxes for any sale of shares.  See
          "Costs."

               To the extent required by applicable law in certain
          jurisdictions, shares of Common Stock offered under the Plan to
          persons not presently shareholders of record are offered only
          through a registered broker/dealer in such jurisdictions.  The
          Company has selected The Bank of New York as the Plan
          Administrator.  The Bank of New York uses BNY ESI & Co., a
          wholly-owned subsidiary of The Bank of New York Company, Inc., as
          the registered broker/dealer through whom Common Stock will be
          offered in such instances and for all Plan trading activity.

               On May 26, 1995, the shareholders of Tucson Electric Power
          Company ("TEP") voted to change the corporate organization of TEP
          into a holding company structure.  On January 1, 1998, a
          statutory share exchange took place where the holders of TEP
          common stock automatically became owners of Common Stock.  Any
          outstanding shares of TEP common stock were automatically
          exchanged, on a share-for-share basis, for shares of Common
          Stock.  Shareholders were not required to take any action to
          effect this exchange, as TEP stock certificates automatically
          represent shares of the Company.

               TEP's Dividend Reinvestment and Common Stock Purchase Plan
          (the "Prior Plan"), which was suspended in 1990 with respect to
          optional cash payments, has been amended and restated and
          constitutes a part of this Plan.  EACH PARTICIPANT IN THE PRIOR
          PLAN IS, WITHOUT ANY FURTHER ACTION, ENROLLED IN THIS PLAN. 
          Prior Plan shares are automatically credited to a Participant's
          Plan account as shares of Common Stock.

               This Plan does not provide for automatic reinvestment of
          dividends, as the Company is not currently paying dividends.  See
          "Dividends on Common Stock."

               This Prospectus contains the provisions of the Plan.  It is
          suggested that this Prospectus be read and retained for future
          reference.


                   THESE SECURITIES INVOLVE A HIGH DEGREE OF RISK.
                             SEE "CERTAIN RISK FACTORS."

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

            THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
              SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
             COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR
              ANY STATE 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 August      , 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 . . . . . . . . . . . . . . . . . . . .   1

          INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE . . . . . . .   1

          CERTAIN RISK FACTORS  . . . . . . . . . . . . . . . . . . . .   2

          THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . . .   4

          THE PLAN  . . . . . . . . . . . . . . . . . . . . . . . . . .   7
               CERTAIN DEFINITIONS  . . . . . . . . . . . . . . . . . .   7
               PURPOSE OF THE PLAN  . . . . . . . . . . . . . . . . . .   8
               ADVANTAGES AND DISADVANTAGES OF THE PLAN . . . . . . . .   8
               PLAN ADMINISTRATION  . . . . . . . . . . . . . . . . . .   9
               PARTICIPATION IN THE PLAN  . . . . . . . . . . . . . . .  10
               INITIAL INVESTMENTS AND OPTIONAL INVESTMENTS . . . . . .  11
               PURCHASES  . . . . . . . . . . . . . . . . . . . . . . .  13
               CERTIFICATES . . . . . . . . . . . . . . . . . . . . . .  14
               SAFEKEEPING OF CERTIFICATES  . . . . . . . . . . . . . .  14
               GIVING PLAN SHARES TO OTHERS . . . . . . . . . . . . . .  15
               SALE OF SHARES . . . . . . . . . . . . . . . . . . . . .  15
               TERMINATION OF PLAN PARTICIPATION  . . . . . . . . . . .  16
               COSTS  . . . . . . . . . . . . . . . . . . . . . . . . .  17
               REPORTS TO PARTICIPANTS  . . . . . . . . . . . . . . . .  17
               OTHER INFORMATION  . . . . . . . . . . . . . . . . . . .  18
               FEDERAL INCOME TAX INFORMATION . . . . . . . . . . . . .  19

          USE OF PROCEEDS . . . . . . . . . . . . . . . . . . . . . . .  20

          DESCRIPTION OF CAPITAL STOCK  . . . . . . . . . . . . . . . .  20

          EXPERTS . . . . . . . . . . . . . . . . . . . . . . . . . . .  21

          PARTICIPANT INFORMATION . . . . . . . . . . . . . . . . . . .  22



          <PAGE>


                                AVAILABLE INFORMATION

               This Prospectus is a prospectus of the Company delivered in
          compliance with the Securities Act of 1933, as amended (the
          "Securities Act").  A Registration Statement (the "Registration
          Statement") has been filed by the Company with the Securities and
          Exchange Commission (the "SEC") under the Securities Act with
          respect to the shares of Common Stock offered hereby.  As
          permitted by the rules and regulations of the SEC, this
          Prospectus omits certain information contained in the
          Registration Statement on file with the SEC.  For further
          information pertaining to the securities offered hereby,
          reference is made to the Registration Statement, including
          exhibits filed as a part thereof.  The Company is subject to the
          informational requirements of the Securities Exchange Act of
          1934, as amended (the "Exchange Act"), and in accordance
          therewith, files periodic reports, proxy statements, and other
          information with the SEC.  The Registration Statement, as well as
          such reports, proxy statements, and other information, can be
          inspected and copied 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 also maintains a Web site that contains periodic
          reports, proxy statements and other information regarding the
          Company and other registrants that file electronically with the
          SEC at http:www.sec.gov.

               Finally, reports, proxy statements, and other information
          concerning the Company are available for inspection and copying
          at the offices of the New York Stock Exchange, Inc., 20 Broad
          Street, New York, New York 10005, and the offices of the Pacific
          Exchange, Inc., 301 Pine Street, San Francisco, California 94104.

                   INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

               The Company hereby incorporates by reference, and as of any
          time hereafter prior to the termination of the offering made by
          this Prospectus the Company shall be deemed to have incorporated
          herein by reference, (1) the latest Annual Report on Form 10-K
          (the "Latest Annual Report"), filed by the Company with the
          Commission pursuant to the Securities Exchange Act, and (2) all
          other reports and documents filed by the Company with the
          Commission pursuant to Section 13(a), 13(c), 14 or 15(d) of the
          Securities Exchange Act subsequent to the filing of the Latest
          Annual Report, and all of such documents shall be deemed to be a
          part hereof from the respective dates of filing thereof.  The
          documents incorporated herein by reference are sometimes called
          the "Incorporated Documents".  Any statement contained in an
          Incorporated Document shall be deemed to be modified or
          superseded to the extent that a statement contained in any
          subsequently filed Incorporated Document modifies or replaces
          such statement.
   

               The Incorporated Documents, incorporated herein by reference
          as of the date of this Prospectus, are the Company'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
          with the SEC.

    
               The Company will provide without charge upon the request of
          any person to whom this Prospectus is delivered, a copy of any or
          all of the Incorporated Documents, excluding the exhibits (unless
          any such exhibit is specifically incorporated by reference into
          an Incorporated Document).  Requests for such documents should be
          directed to the Company at the following address:  UniSource
          Energy Corporation, Records & Library Services DAB03, P. O. Box
          711, Tucson, Arizona  85702, or by calling (520) 884-3781.


          <PAGE>


                                 CERTAIN RISK FACTORS

               The shares of Common Stock 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 shares of Common Stock 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,

                                      -2-
<PAGE>


          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
          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 Corporation ("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.
    
                                      -3-

<PAGE>


          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.  

               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.


                                     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

                                      -4-

<PAGE>

          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.
   
               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

                                      -5-

<PAGE>


          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 startup 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
          million 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
          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.

                                      -6-


          <PAGE>


                                       THE PLAN

               The following is a complete statement of the Plan.

               Nothing contained herein or in any other Plan information
          represents a recommendation that any person buy, hold or sell
          Common Stock.  A decision to purchase shares of Common Stock
          through the Plan should only be made after an eligible investor
          has read this prospectus and independently made an investment
          decision.

          CERTAIN DEFINITIONS

               For convenience of reference, the definitions of certain
          terms are provided below.

           Acknowledgement Form --  A form  acknowledging the Participant's
                                    enrollment in the Plan.

           Business Day --          A day on which  the Plan  Administrator
                                    is open for business.


           Common Stock --          The common stock, without par value, of
                                    the Company.

           Company --               UniSource Energy Corporation.

           Enrollment Form --       A  "Direct  Stock   Purchase  Plan  New
                                    Enrollment  Form."   The form  that the
                                    investor  must complete  to be  able to
                                    participate in the  Plan and to express
                                    other directions  with respect  to  the
                                    Plan  account.    The completion  of an
                                    Enrollment Form  is not  necessary  for
                                    participants in the Prior Plan.


           Independent Agent --     BNY   ESI   &   Co.,   a   wholly-owned
                                    subsidiary  of  The Bank  of  New  York
                                    Company,  Inc., the  registered broker-
                                    dealer    selected    by    the    Plan
                                    Administrator  to purchase  and/or sell
                                    shares    of     Common    Stock    for
                                    Participants.

           Initial Investment --    A  payment made to the Company by those
                                    participants who  were not part of  the
                                    Prior Plan for  the initial purchase of
                                    shares  of Common Stock to  open a Plan
                                    account.       The    minimum   Initial
                                    Investment is $250.


           Investment Date --       Investments  from Participants  will be
                                    invested on  the 10th  and 25th day  of
                                    each month (or, if not  a Business Day,
                                    the     preceding     Business    Day).
                                    Investments made  automatically through
                                    Electronic Funds  Transfer are deducted
                                    on the 25th day  of each month and will
                                    be invested on such Investment Date. 


           Latest Annual Report --  The latest Annual Report  on Form  10-K
                                    that is filed by the Company.

           Optional Investment --   A  payment  made   subsequent  to   the
                                    Initial  Investment  and enrollment  in
                                    the  Plan.   An Optional  Investment is
                                    $50 or more.


           Participant --           A person who is enrolled in the Plan.

                                      -7-


<PAGE>

           Plan --                  UniSource Energy Corporation Investment
                                    Plus Plan.


           Plan Administrator --    The Bank of New York.

           Prior Plan --            Tucson Electric  Power Company Dividend
                                    Reinvestment and  Common Stock Purchase
                                    Plan.

           Safekeeping --           The Plan's  "safekeeping" service which
                                    Participants  may  use  to  deposit any
                                    Common  Stock   certificates  in  their
                                    possession with  the Plan Administrator
                                    and  have   credited  to   their   Plan
                                    account.


          Shareholder of Record--   An  investor  whose  shares  of  Common
                                    Stock  are registered  on the  books of
                                    the  Company  as   maintained  by   the
                                    Transfer Agent.

           Statement of Account --  A statement  providing detailed account
                                    information  such  as amount  invested,
                                    purchase   price,   number  of   shares
                                    accumulated   and    other   investment
                                    information.


           Transaction Request      A  form  completed  by the  investor in
           Form --                  order  to  make  Optional  Investments,
                                    address     changes,     deposit     of
                                    certificates,  withdrawal  of   shares,
                                    sale of shares, or account termination.

           Transfer Agent --        The Bank of New York.


          PURPOSE OF THE PLAN  

               1.   WHAT IS THE PURPOSE OF THE PLAN?

          The purpose of the Plan is to provide interested investors with a
          convenient method of purchasing Common Stock directly through the
          Plan Administrator without payment of any brokerage commission.

          ADVANTAGES AND DISADVANTAGES OF THE PLAN

               2.   WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF THE PLAN?

          ADVANTAGES:

               DIRECT PURCHASE OF STOCK--Participants may purchase Common
               Stock directly through the Plan Administrator, without the
               cost of brokerage or other fees.

               FULL INVESTMENT OF FUNDS--The full amount of Initial
               Investments and Optional Investments is invested because the
               Plan permits fractional shares to be credited to Plan
               accounts.

               CERTIFICATE SAFEKEEPING--Participants may deposit their
               Common Stock certificates with the Plan Administrator,
               whether or not the Common Stock represented by such
               certificates was purchased through the Plan.  This
               convenience is provided at no cost to the Participant and
               eliminates the possibility of loss, inadvertent destruction
               or theft of certificates.  Also, because shares deposited
               for Safekeeping are treated in the same manner as shares
               purchased through the Plan, they may be transferred or sold
               through the Plan.

                                      -8-
   
<PAGE>

               GIVING PLAN SHARES--An investor may give Plan shares by:

                .   making an Initial Investment to establish a Plan
                    account for the recipient;
                .   by making Optional Investments to the recipient's
                    existing Plan account; or 
                .   transferring shares from the investor's Plan account to
                    the recipient's Plan account.

               SELL STOCK--Participants may sell shares held in their Plan
               account, including odd-lot sales.

               BROKERAGE COMMISSIONS--No brokerage commissions are charged
               in connection with purchases under the Plan.

               SIMPLIFIED RECORDKEEPING--A Statement of Account will be
               mailed to Participants after any investment activity and a
               comprehensive statement will be mailed to Participants
               annually.

          DISADVANTAGES:

               NO INTEREST ON FUNDS PENDING INVESTMENT--No interest is paid
               on Initial Investments or Optional Investments held pending
               investment.

               DELAY IN DETERMINING PURCHASE PRICE--The number of shares
               purchased for a Participant's Plan account and the purchase
               price will not be determined until all shares for the
               relevant Investment Date have been purchased.  Therefore,
               Participants will not know the number of shares purchased or
               the purchase price until after the applicable Investment
               Date.

               RETURN OF OPTIONAL INVESTMENTS--Initial Investments or
               Optional Investments sent to the Plan Administrator will not
               be returned to a Participant unless a written request is
               received by the Plan Administrator two Business Days prior
               to the applicable Investment Date.  However, the Plan
               Administrator reserves the right to return an Optional
               Investment for any reason (an unsigned check, for example).

               BROKERAGE COMMISSIONS--Sales under the Plan are subject to
               brokerage commissions.

               PRICE OF SHARES--Participants cannot designate a specific
               price at which to sell or purchase Common Stock.  Therefore,
               Participants bear the risk of fluctuations in the market
               price of Common Stock.

               INSURANCE--Plan accounts are not insured by the Securities
               Investor Protection Corporation, the Federal Deposit
               Insurance Corporation or any other entity.


          PLAN ADMINISTRATION

               3.   WHO ADMINISTERS THE PLAN?

          The Company has retained The Bank of New York as plan
          administrator (the "Plan Administrator").  The Bank of New York
          is a recognized leader in the securities processing industry and
          is committed to providing shareholders of the Company with
          quality service.

          As Plan Administrator, The Bank of New York will purchase and
          hold shares of Common Stock acquired under the Plan, keep
          records, send reports of account activity to Participants, and
          perform other duties relating to the Plan.  Shares purchased
          under the Plan and held by the Plan Administrator for each
          Participant's account, will be registered in the Plan
          Administrator's name or the name of its nominee for the benefit
          of the Participants.  In the event that the Plan Administrator
          resigns or otherwise ceases to act as plan administrator, the
          Company will appoint a new plan administrator to administer the
          Plan.

                                      -9-

<PAGE>

          The Plan Administrator also acts as transfer agent and registrar
          for the Common Stock.  Questions can be answered by contacting
          The Bank of New York at the following locations:

                .   Participants may contact the Plan Administrator toll
                    free 1-888-269-8845.
                .   The Plan Administrator's website address is
                    http:stock.bankofny.com
                .   The Plan Administrator's e-mail address is Shareowner-
                    [email protected]  Messages sent through the Internet
                    will be responded to within one business day.
                .   The Plan Administrator's mailing address is as follows
                    (other address(es) may be published for the Plan
                    Administrator from time to time):

                    For Inquiries:           For Transaction Processing:
                    -------------            --------------------------

                    The Bank of New York     The Bank of New York
                    Shareholder Relations    Dividend Reinvestment 
                    Department 11E           Department
                    PO Box 11258             P.O. Box 1958
                    Church Street Station    Newark, NJ  07101-1958
                    New York, NY  10286

          THE BANK OF NEW YORK PROVIDES NO ADVICE AND MAKES NO
          RECOMMENDATIONS WITH RESPECT TO ANY SECURITY.  ANY DECISION TO
          PURCHASE OR SELL MUST BE MADE BY EACH INDIVIDUAL PLAN PARTICIPANT
          BASED ON HIS OR HER OWN RESEARCH AND JUDGMENT.

          PARTICIPATION IN THE PLAN

               4.   WHO IS ELIGIBLE TO PARTICIPATE IN THE PLAN?

          Any interested investor is eligible to participate in the Plan
          provided that (i) they meet the requirements for participation as
          described in the following paragraph outlined below and (ii) in
          the case of citizens or residents of a country other than the
          United States, its territories or possessions, participation
          would not violate local laws applicable to the Company or the
          Participant.

          In certain jurisdictions, applicable laws require that Common
          Stock offered under the Plan to persons not presently
          Shareholders of Record be offered only through a registered
          broker-dealer. No offers or sales will be effected in those
          jurisdictions unless the Company has satisfied the requirements
          of the state securities laws applicable to the operation of the
          Plan. To the extent required by applicable law in certain
          jurisdictions, shares of Common Stock offered under the Plan to
          persons not presently Shareholders of Record of Common Stock are
          offered only through a registered broker/dealer in such
          jurisdictions.  The Plan Administrator has selected BNY ESI & Co.
          as the registered broker/dealer through whom shares will be
          offered in such instances and for all plan trading activity.

               5.  HOW DOES AN ELIGIBLE INVESTOR ENROLL THE PLAN?

          PARTICIPANTS IN THE PRIOR PLAN are, without further action,
          enrolled in the Plan.  Prior Plan shares are automatically
          credited to their Plan account as shares of UniSource Energy
          Corporation common stock.  Prior Plan participants are not
          required to make any Initial Investment.  Prior Plan participants
          who wish to withdraw from the Plan may do so by following the
          procedure outlined in Question 25.

          After being furnished with a Plan Prospectus, OTHER ELIGIBLE
          INVESTORS may join the Plan by completing and signing an
          Enrollment Form and returning it to the Plan Administrator at the
          address shown in "Plan Administration."  See Question 3. 
          Shareholders of Record should sign their names on the Enrollment
          Form exactly as they appear on their certificates.

                                      -10-

<PAGE>

          The Enrollment Form serves both to initiate participation and to
          appoint the Independent Agent to act on behalf of the Participant
          in buying and selling shares of Common Stock under the Plan.  An
          eligible applicant's Initial Investment of $250 or more must be
          enclosed with the Enrollment Form.  See Questions 8 and 9.

          Requests for Enrollment Forms, as well as other Plan forms and
          this Prospectus, should be made by writing to the Plan
          Administrator or by calling the Plan Administrator.  See "Plan
          Administration," Question 3.

               6.   WHEN WILL PLAN ENROLLMENT COMMENCE?

          Enrollment Forms will be processed promptly by the Plan
          Administrator.  Once enrolled in the Plan, Participants will
          remain enrolled until (i) they withdraw from the Plan, (ii) the
          Company terminates their participation in the Plan, or (iii) the
          Company terminates the Plan.  See "Termination of Plan
          Participation,"  Questions 24-27.


               7.   MAY THE PLAN ADMINISTRATOR RESTRICT PARTICIPATION IN
          THE PLAN?

          Yes.  The Plan Administrator reserves the right to restrict or
          terminate participation in the Plan if such participation appears
          to be contrary to the general intent of the Plan or in violation
          of applicable law.  See "Termination of Plan Participation,"
          Questions 24-27.

          INITIAL INVESTMENTS AND OPTIONAL INVESTMENTS

               8.   How is an Initial Investment made?
          Any investor whose signed Enrollment Form has been accepted by
          the Plan Administrator is eligible to make Initial Investments. 
          A Participant may make the Initial Investment when enrolling.  An
          Initial Investment must be $250 or more and should be in the form
          of a check, money order, or wire transfer payable through a U.S.
          bank or other financial institution, to "The Bank of New York." 
          Third party checks will not be accepted.  DO NOT SEND CASH. 
          Investors making wire transfers should contact the Plan
          Administrator for wire instructions and may be charged fees by
          their institution.  Please use the pre-addressed envelope
          provided to send the signed Enrollment Form and any Initial
          Investment.

          NOTICE TO TEP CUSTOMERS:  Do NOT include Initial Investments and
          Enrollment Form with payment for utility service billings or
          other payments due TEP or affiliates.

               9.   WHAT ARE OPTIONAL INVESTMENTS?

          Once enrolled, Plan Participants are eligible to make periodic
          Optional Investments, as frequently as twice monthly to purchase
          additional shares of Common Stock.  The minimum Optional
          Investment is $50.

          Participants may make Optional Investments in the form of a
          check, money order or wire transfers through a U.S. bank or other
          financial institution, in U.S. dollars, payable to "The Bank of
          New York."  Third party checks will not be accepted.  DO NOT SEND
          CASH.  A Participant may also make Option Investments on a
          monthly basis automatically through Electronic Funds Transfer. 
          See Question 10.

          Participants are under no obligation to make Optional Investments
          and may cease making Optional Investments at any time without
          withdrawing from the Plan.

          Optional Investments will not be accepted by the Plan
          Administrator if a Participant imposes any restrictions with
          respect to the number of shares to be purchased, the price at
          which shares are to be purchased, the timing of a purchase, or
          what the Participant's balance will be following a purchase.  In
          addition, the Plan Administrator will not purchase shares for a

                                     -11-

<PAGE>

          Participant without advance payment, nor will it refund any part
          of a Participant's Optional Investment after shares are
          purchased. It is not possible for the Plan Administrator to
          inform a Participant in advance of how much money to send for the
          purchase of a full or fractional share because the per-share
          price will not be known until the shares are purchased.

               10.  HOW DOES A PARTICIPANT MAKE OPTIONAL INVESTMENTS?

          OPTIONAL INVESTMENTS BY MAIL 

          A Participant may make an Optional Investment by enclosing a
          check with the Transaction Request form attached to the Statement
          of Account, which will be sent to each Participant by the Plan
          Administrator.  A Participant may also send in a check without
          this form, however, your Plan account number must be included on
          your check.  Payments should be mailed to the following address:

                         The Bank of New York
                         Dividend Reinvestment Department
                         P.O. Box 1958
                         Newark, NJ  07101-1958

          OPTIONAL INVESTMENTS BY ELECTRONIC FUNDS TRANSFER

          A Participant may contact the Plan Administrator to arrange for
          Optional Investments to be made automatically through Electronic
          Fund Transfers (EFT).  EFT payments are deducted monthly from the
          Participant's designated account through any financial
          institution that participates in the Automated Clearing House. 
          Deductions are made on the 25th day of each month, or if such
          date is not a Business Day, the deduction will be made on the
          preceding Business Day.  Amounts received will be invested on
          such Investment Date after receipt of the funds.  Participants
          may be charged by their financial institution for this service.

               11.  WHEN WILL A PARTICIPANT'S INITIAL INVESTMENT OR
                    OPTIONAL INVESTMENT BE INVESTED?

          The Plan Administrator must receive Optional Investments and
          Initial Investments at least three Business Days prior to an
          Investment Date to be invested on that Investment Date. 
          Otherwise, the Optional Investment or Initial Investment will be
          held by the Plan Administrator for investment until the next
          Investment Date.  See Question 10 for information regarding when
          EFT funds will be invested.

          Initial Investments and Optional Investments received by the
          Company are deposited promptly into a segregated escrow account
          pending investment.  No Initial Investment or Optional Investment
          will remain uninvested more than 35 days following receipt by the
          Company.

               12.  WHAT HAPPENS IF A CHECK SUBMITTED FOR INVESTMENT IS
                    RETURNED UNPAID?

          In the event that a check submitted for investment is returned
          unpaid for any reason, the Plan Administrator will consider the
          request for investment of such funds null and void.  Any shares
          purchased with such funds will be immediately removed from the
          Participant's account.  The Plan Administrator will be entitled
          to sell those shares to satisfy any uncollected amounts,
          including the returned-check fee.  If the net proceeds of the
          sale of such shares are insufficient to satisfy the balance of
          such uncollected amounts, the Plan Administrator will be entitled
          to sell additional shares from the Participant's account to
          satisfy the uncollected balance.

                                     -12-

<PAGE>

               13.  MAY A PARTICIPANT REQUEST THAT AN INITIAL INVESTMENT OR
                    OPTIONAL INVESTMENT BE RETURNED?

          Yes.  A Participant may request, in writing, the return of an
          Initial Investment or Optional Investment that has not yet been
          invested.  The funds will be returned if the request is received
          at least two Business Days immediately preceding the applicable
          Investment Date.  However, no refund of a check or money order
          will be made until the funds have been actually deposited into
          escrow by the Plan Administrator.  Accordingly, such refund may
          be delayed for up to three weeks.

          PURCHASES

               14.  HOW IS COMMON STOCK PURCHASED FOR THE PLAN
          PARTICIPANTS?

          Common Stock purchased through the Plan will be purchased, either
          directly from the Company or on the open market, at the Company's
          sole discretion.  Shares purchased directly from the Company are
          issued from the Company's previously authorized but unissued
          shares.  Open market transactions are effected through the
          Independent Agent appointed by the Plan Administrator.  In either
          case, there are no commission charges to participants on the
          purchase of Common Stock.  The Independent Agent will have full
          discretion in all matters related to open market purchases,
          including the day and time of purchase, price paid, number of
          shares purchased, and the markets or persons through whom the
          purchases are made.  The purchase price to the Plan Participant
          is the same, however, the tax basis may differ.  See Question 38. 

               15.  WHEN ARE SHARES PURCHASED FOR THE PLAN?

          Shares will be purchased on each Investment Date.  See definition
          of Investment Date.

               16.  WHEN WILL SHARES BE CREDITED TO A PARTICIPANT'S
                    ACCOUNT?

          Shares purchased will be considered settled and credited to a
          Participant's Plan account on the Investment Date.

               17.  HOW IS THE PURCHASE PRICE OF THE COMMON STOCK
                    DETERMINED?

          The purchase price of Common Stock will be the average of the
          high and low sale prices of the Common Stock on the consolidated
          tape as reported by Dow Jones on the respective Investment Date.

          The purchase price of Common Stock purchased by the Independent
          Agent on the open market will be the weighted average purchase
          price per share of all shares purchased on the applicable
          Investment Date.

               18.  HOW MANY SHARES OF COMMON STOCK WILL BE PURCHASED FOR A
                    PARTICIPANT?

          The number of shares purchased for a Participant will be equal to
          the Participant's Initial Investment or Optional Investment for
          the applicable Investment Date divided by the purchase price of
          the shares.  The Participant's Plan account will be credited with
          the whole and fractional shares (to four decimal places).

               19.  CAN A PARTICIPANT REQUEST THE PURCHASE OF A SPECIFIC
                    NUMBER OF SHARES OR A SPECIFIC PRICE?

          No.  Since the purchase price of the Common Stock cannot be
          calculated until the Common Stock is purchased, a Participant may
          not request the purchase of a specific number of shares.

                                     -13-

<PAGE>


          CERTIFICATES

               20.  WILL CERTIFICATES BE ISSUED FOR SHARES PURCHASED
          THROUGH THE PLAN?

          No.  The certificates for shares purchased through the Plan are
          registered in the name of the Plan Administrator, or its nominee. 
          Participants requesting the issuance of a certificate for their
          Plan shares must submit a Transaction Request Form to the Plan
          Administrator, specifying the number of whole shares and
          certificates to be issued.  Certificates cannot be issued for
          fractional shares; fractional shares must be sold when
          terminating participation.  The certificate will be issued in the
          name(s) of the Participant(s) only.  After the issuance of a
          certificate, the shares represented thereby are deemed withdrawn
          from the Plan.  Certificates will be issued within five Business
          Days following the receipt of the request.  See Questions 22 and
          23 for information on giving or transferring plan shares to
          others.

          SAFEKEEPING OF CERTIFICATES

               21.  CAN CERTIFICATES BE DEPOSITED WITH THE PLAN
                    ADMINISTRATOR TO BE HELD IN THE PARTICIPANT'S PLAN
                    ACCOUNT?

          Yes.  Participant's may use the Plan's "safekeeping" service to
          deposit any Common Stock certificates in their possession with
          the Plan Administrator.  Some of the advantages of certificate
          safekeeping are:

                .   The risk associated with the loss of stock certificates
                    is eliminated.  If certificates are lost or stolen, the
                    owner cannot sell or transfer them without first
                    obtaining replacement certificates.  This process could
                    take several weeks and results in cost and paperwork
                    for the owner and the Transfer Agent.

                .   Certificates deposited in the Plan for safekeeping are
                    treated in the same manner as shares of Common Stock
                    purchased through the Plan and may be conveniently sold
                    or transferred through the Plan.

          Participants may submit certificates for Safekeeping at any time.

          The method used to submit certificates for Safekeeping is at the
          option and risk of the Participant.  The Company strongly
          recommends that Participants use registered mail with insurance
          when sending stock certificates.

          All shares represented by the certificates submitted for
          Safekeeping will be transferred into the name of the Plan
          Administrator or its nominee and credited to the Participant's
          Plan account.  The physical certificate submitted to the Plan
          Administrator for safekeeping will then be marked "canceled" and
          ultimately discarded.  A Statement of Account showing the number
          of shares credited to the Participant's Plan account will be
          mailed to the Participant.

          Shares of Common Stock held in a Participant's account may not be
          assigned or pledged.  (See Question 35)  Lost certificates must
          be replaced before they can be submitted for Safekeeping.

          It is the Participant's responsibility to establish and maintain
          a record of the cost of shares represented by certificates sent
          to the Plan Administrator for Safekeeping.  In addition, the Plan
          Administrator reserves the right to establish limits on the
          number of shares held for Safekeeping and minimum time periods
          for retention of these shares in the Plan.  This reservation is
          intended to minimize administrative expense and discourage use of
          the Plan for purposes other than as a continuing investment
          service.

                                     -14-

<PAGE>


          GIVING PLAN SHARES TO OTHERS

               22.  CAN PLAN SHARES BE GIVEN TO OTHERS?

          Yes.  Common Stock can be given to others in three ways:

                .   A donor may make an Initial Investment to establish an
                    account in the recipient's name.  Under this method,
                    the donor completes and submits to the Plan
                    Administrator an Enrollment Form in the recipient's
                    name together with an Initial Investment of $250 or
                    more.

                .   A donor may submit an Optional Investment in an amount
                    of $50 or more on behalf of an existing Participant; or
                                                   --------

                .   An existing Participant may transfer shares from his or
                    her account to a new or existing recipient's account. 
                    See Question 23.

          In order to establish a new account for a gift recipient a
          Participant must complete and submit to the Plan Administrator an
          Enrollment Form in the recipient's name.  See Question 23.

          Unless otherwise requested by the donor, the recipient will
          receive a Statement of Account showing the number of shares given
          to and held in the recipient's Plan account.

               23.  MAY PARTICIPANTS ASSIGN OR TRANSFER ALL OR PART OF
                    THEIR SHARES HELD UNDER THE PLAN TO ANOTHER PERSON?

          Yes.  Participants may transfer the ownership of all or part of
          the shares of Common Stock held in their Plan account through a
          gift, a private sale or otherwise by delivering written
          instructions and a properly executed stock assignment (stock
          power) to the Plan Administrator.  The completed assignment must
          specify the number of shares of Common Stock and the name,
          address, and federal identification number of the transferee. 
          Requests for transfer are subject to the same requirements as for
          the transfer of Common Stock certificates, including signatures
          of all account owners, guaranteed by a member of a Medallion
          program.  UPON SUCH A TRANSFER, THE RECIPIENT WILL BE DEEMED A
          PARTICIPANT IN THE PLAN.

          In order to establish a new account for the transferee the
          Participant must complete and submit to the Plan Administrator an
          Enrollment Form in the recipient's name.  The transferees will
          receive a statement showing the number of shares transferred and
          now held in their Plan accounts.

          Stock power forms are available at local banks, brokerage firms
          and from the Plan Administrator.  See Question 3.

          SALE OF SHARES

               24.  HOW MAY PARTICIPANTS SELL THEIR PLAN SHARES?

          Participants may sell their Plan shares by submitting a
          Transaction Request Form to the Plan Administrator.  The request
          should indicate the number of shares to be sold and must be
          signed by ALL account owners.  Shares acquired through and held
          in the Plan, as well as shares surrendered for Safekeeping, may
          be sold in this manner.  A request to sell shares is irrevocable
          after it is received by the Plan Administrator.

          If a Participant requests that shares be sold, the Plan
          Administrator will aggregate such shares from other Participants
          during that week, and will then place a market order with the
          Independent Agent to sell such shares during the following week. 
          A check will be issued for the proceeds of the sale less any
          brokerage commission, service fee and applicable taxes within

                                     -15-

<PAGE>

          four Business Days following the date of such sale.  The check
          will be made payable to the registered account owners only.  See
          Questions 28 and 38.

          The Independent Agent will have full discretion in all matters
          related to the sale, including the day and time of sale, sale
          price, and the markets or persons through whom the shares are
          sold.  Participants cannot specify a price at which to sell their
          shares.

          Shares held outside the Plan may not be sold through the Plan.

          PARTICIPANTS WHO SELL ALL OF THEIR SHARES THAT ARE HELD IN THE
          PLAN AUTOMATICALLY TERMINATE THEIR PARTICIPATION IN THE PLAN. A
          REQUEST TO SELL SHARES IS IRREVOCABLE AFTER IT IS RECEIVED BY THE
          PLAN ADMINISTRATOR. HOWEVER, PARTICIPANTS MAY ELECT TO RE-ENROLL
          AT ANY TIME PROVIDED THAT THEY REMAIN ELIGIBLE TO PARTICIPATE.
          SEE QUESTIONS 4 AND 5.

          TERMINATION OF PLAN PARTICIPATION

               25.  HOW MAY A PARTICIPANT TERMINATE PARTICIPATION IN THE
          PLAN?

          Participants may terminate participation in the Plan at any time
          by notifying the Plan Administrator of their intention to
          terminate participation in the Plan, having all account owners
          sign the request and indicating whether they wish to receive a
          stock certificate or to sell their Plan shares.  Proceeds from
          the sale of the shares will be reduced by brokerage commissions,
          a $5.00 service fee and applicable taxes.  Certificates cannot be
          issued for fractional shares; fractional shares must be sold when
          terminating participation.  See Questions 28 and 38.

          Optional Investments received prior to the request to terminate
          Plan participation will be invested on the next Investment Date
          unless the Participant timely requests the return of that
          Optional Investment.  See Question 13.

               26.  WHAT HAPPENS TO FRACTIONAL SHARES WHEN PARTICIPANTS
          TERMINATE THEIR PLAN ACCOUNTS?

          When Participants terminate their Plan accounts, cash payments
          representing any fractional share held will be mailed directly to
          them as soon as practicable after the settlement for the
          applicable sale less brokerage commissions, taxes and service
          fees. For Participants selling fractional shares, the proceeds,
          if any, of the sale of fractional shares will be the fraction
          multiplied by the whole-share price less applicable brokerage
          commissions.

               27.  MAY THE PLAN ADMINISTRATOR TERMINATE A PARTICIPANT'S
          PLAN PARTICIPATION?

          Yes.  The Plan Administrator may terminate a Plan account for any
          of the following reasons:

                .   The Plan account becomes subject to any unclaimed
                    property law;
                .   The Plan Administrator receives proper notification of
                    a Participant's death or incapacity;
                .   The Participant does not maintain at least one whole
                    share of Common Stock in the Plan account; or
                .   The Plan Administrator believes that a Participant's
                    participation in the Plan is contrary to the general
                    intent of the Plan or in violation of applicable law.

          The Plan Administrator will notify the Participant prior to such
          termination.  The Plan Administrator will issue a certificate for
          whole shares and a check for the net cash value of any fractional
          share in the Plan account less applicable brokerage commissions,
          taxes and service fees.

          In the event that the Plan account is terminated for any of the
          foregoing reasons, the account assets will be distributed to the
          appropriate state for unclaimed property purposes, the
          Participant, or his or her beneficiary, as the case may be.

                                     -16-

<PAGE>

          In addition, the Company retains the right, in its sole
          discretion, to terminate or suspend the Plan.  See Question 34
          below.


          COSTS

               28.  WHAT COSTS ARE ASSOCIATED WITH PARTICIPATION IN THE
          PLAN?

          No broker fees, commissions or other charges will be incurred by
          Participants for shares PURCHASED from the Company for their Plan
          accounts.  The cost to the Participant in administrative service
          fees and brokerage commission for each type of transaction are as
          follows and are considered part of the "Terms and Conditions" of
          the Plan:

               PURCHASES
               Initial Investments / Enrollment . . . . . . .  Company Paid
               Optional Investments . . . . . . . . . . . . .  Company Paid
               Brokerage commissions newly-issued stock . . . . . . .  None
               Brokerage commissions open market purchases  .  Company Paid
                    This may result in taxable income and an increase in
                    tax basis.  See Question 38.

               SALES
               Service fee  . . . . . . . . . . . .  $ 5.00 per transaction
               Plus brokerage commission  . . . . .  $ 0.10  per share sold
                    See Question 38.

               OTHER
               Deposit of Certificates for Safekeeping  . . .  Company Paid
               Transfer of shares to another Participant 
                    (Book to Book)  . . . . . . . . . . . . .  Company Paid
               Account Termination  . . . . . . . . . .  $ 5.00 per account
               Issuance of Certificates . . . . . . . . . . .  Company Paid

               FEES ARE SUBJECT TO CHANGE; WRITTEN NOTIFICATION WILL BE
               PROVIDED 90 DAYS PRIOR.

               MINIMUM INVESTMENTS
               Initial Investment . . . . . . . . . . . . . . . . . $250.00
               Optional Investments . . . . . . . . . . . . . . . .  $50.00
               Maximum Investments  . . . . . . . . . . . . . . . . .  None

          REPORTS TO PARTICIPANTS

               29.  WHAT REPORTS ARE SENT TO PARTICIPANTS?

          Participants will receive a confirmation following each
          transaction with respect to shares for their Plan accounts. 
          Participants will also receive a year-end Statement of Account
          showing the amount invested, purchase price, the number of shares
          purchased, deposited, sold, transferred, or withdrawn during the
          calendar year and the total number of shares accumulated.

          EACH PARTICIPANT SHOULD RETAIN ALL CONFIRMATIONS AND STATEMENTS
          OF ACCOUNT FOR THEIR RECORDS SO AS TO BE ABLE TO ESTABLISH THE
          COST BASIS OF SHARES PURCHASED UNDER THE PLAN FOR INCOME TAX AND
          OTHER PURPOSES.  

          A Statement of Account will be provided upon request to the Plan
          Administrator.  

          In addition, Participants will receive copies of any amendments
          to the Prospectus relating to the Plan and will receive copies of
          the same communications sent to all other shareholders, including
          the Company's quarterly reports and Annual Report to
          Shareholders, Notice of the Annual Meeting and accompanying proxy

                                     -17-

<PAGE>

          material.  All communication from the Plan Administrator to
          Participants will be addressed to the latest address of record;
          therefore, it is important that Participants promptly notify the
          Plan Administrator of any change of address.

          OTHER INFORMATION

               30.  WHAT HAPPENS IF THE COMPANY DECLARES A DIVIDEND PAYABLE
                    IN COMMON STOCK OR A STOCK SPLIT?

          Any dividends in the form of shares of Common Stock and any
          shares resulting from a Common Stock split on shares held in a
          Participant's Plan account will be credited to the Participant's
          Plan account.  Notification of a stock dividend or stock split
          will be mailed directly to the Participant in the same manner as
          to shareholders who are not participating in the Plan. 
          Transaction processing may be curtailed or suspended until the
          completion of any stock dividend or stock split.

               31.  IF THE COMPANY HAS A RIGHTS OFFERING, HOW WILL A
                    PARTICIPANT'S ENTITLEMENT BE COMPUTED?

          Participant's entitlement in a regular rights offering will be
          based upon his total holdings.  Rights certificates will be
          issued for the number of whole shares only, however, and rights
          based on a fraction of a share held in a Participant's account
          will be sold for his account and the net proceeds will be
          invested.  Transaction processing may be curtailed or suspended
          until the completion of any rights offering.

               32.  WILL A PARTICIPANT'S SHARES BE VOTED AT MEETINGS OF
                    SHAREHOLDERS?

          Participants in the Plan will receive a proxy statement and a
          proxy card representing whole Plan account shares as well as any
          Common Stock held of record.  Shares held in the Plan may be
          voted in person or by proxy, just like any other share.  

               33.  WHAT IS THE RESPONSIBILITY OF THE COMPANY AND ITS
                    AGENTS UNDER THE PLAN?

          Neither the Company, the Plan Administrator, nor the Independent
          Agent (nor any of their respective agents, representatives,
          employees, officers or directors) will be liable for any act done
          in good faith or for any good faith omission to act with respect
          to the Plan, including, without limitation, any claim of
          liability arising out of failure to terminate a Participant's
          account upon such Participant's death prior to receipt of notice
          in writing of such death or with respect to the prices or times
          at which, or sources from which, shares are purchased or sold for
          Participants, or with respect to any fluctuation in market value
          before or after any purchase or sale of shares.  This limitation
          of liability will not constitute a waiver by any Participant of
          their rights under the federal securities laws of the United
          States.

          THE COMPANY CANNOT AND WILL NOT GUARANTEE A PROFIT, OR PROTECT
          PARTICIPANTS AGAINST LOSS, ON SHARES PURCHASED OR SOLD PURSUANT
          TO THE PLAN.  THE MARKET PRICE OF COMMON STOCK CAN FLUCTUATE
          SUBSTANTIALLY.

               34.  MAY THE PLAN BE CHANGED OR DISCONTINUED?

          Yes.  The Company may suspend, modify or terminate the Plan at
          any time in whole or in part.  The Plan Administrator will notify
          all Participants of any suspension, modification or termination
          of the Plan.  The Company also reserves the right to interpret
          and regulate the Plan as it deems necessary or desirable in
          connection with its operation.  The Company may register
          additional shares for sale under the Plan from time to time.

                                     -18-

<PAGE>

               35.  MAY COMMON STOCK HELD IN A PLAN ACCOUNT BE PLEDGED AS
                    COLLATERAL?

          No.  Common Stock held in a Plan account may not be assigned or
          pledged as collateral.  Participants wishing to assign or pledge
          their Common Stock as collateral must have certificates issued
          for the shares.  The certificates can then be delivered for
          collateral.

               36.  HOW MAY INSTRUCTIONS BE GIVEN TO THE PLAN
                    ADMINISTRATOR?

          All instructions from a Participant to the Plan Administrator
          should be made by using the Transaction Request Form, however,
          the Plan Administrator may in the future allow certain
          instructions to be given by telephone or in any other manner
          agreed to by the Plan Administrator and the Participant.

               37.  UNDER WHAT STATE'S LAW WILL THE PLAN BE GOVERNED?

          Arizona law governs the terms and conditions of the Plan.

          FEDERAL INCOME TAX INFORMATION

               38.  WHAT ARE THE FEDERAL INCOME TAX CONSEQUENCES OF PLAN
                    PARTICIPATION?

          The Company believes the following is an accurate summary of the
          federal tax consequences of participation in the Plan.  PLEASE
          CONSULT YOUR TAX OR FINANCIAL ADVISOR WITH RESPECT TO FEDERAL,
          STATE, LOCAL AND OTHER TAX LAWS WHICH APPLY TO YOUR SPECIFIC
          SITUATION.


          PURCHASES
          ---------

          Participants who purchase Common Stock through voluntary payments
          to the Plan are not treated for federal income tax purposes as
          receiving income by virtue of the purchase of Common Stock with
          the voluntary payment.  Any brokerage commissions paid by the
          Company upon the purchase of shares in the open market will
          constitute TAXABLE INCOME to the Participant on whose behalf such
          commissions are paid and, accordingly, such Participant will be
          furnished with the appropriate tax form.  The TAX BASIS of shares
          purchased with Initial Investments and Optional Investments will
          be equal to the amount of such investment plus the amount of any
          brokerage commissions, if any, paid by the Company on behalf of
          the Participant and included in the taxable income of the
          Participant.

          Employees who purchase Common Stock through automatic payroll
          deductions, should this option become available, will recognize
          the same amount of compensation income (wages) for federal income
          tax purposes which they would have recognized had they not
          purchased Common Stock through automatic payroll deductions. 
          Compensation income exists even though the amount of automatic
          payroll deductions is not paid to the employee in cash but
          instead is applied to the purchase of Common Stock for the
          participant's Plan Account.

          SALES
          -----

          Upon the sale of either a portion or all of shares from the Plan,
          a Participant may recognize a capital gain or loss based on the
          difference between the sales proceeds, net of broker commissions,
          and the tax basis in the shares sold, including any fractional
          shares.  

          For Participants who are subject to U. S. withholding tax, backup
          withholding, or foreign taxes, the Plan Administrator will
          withhold the required taxes from proceeds from the sale of shares
          sold through the Plan.  The proceeds received by the Participant
          will be net of the required taxes.

          The sale of shares through the Plan will be reported to the
          Internal Revenue Service on the appropriate tax form.

                                     -19-

<PAGE>


                                   USE OF PROCEEDS

               To the extent that shares are purchased directly from the
          Company, the Company intends to use the net proceeds for general
          corporate purposes.  The Company has no basis for estimating
          either the number of shares of Common Stock that will ultimately
          be sold pursuant to the Plan or the prices at which such shares
          will be sold.  The Company will receive no net proceeds from the
          offering of shares which are purchased by the Independent Agent
          in open market transactions.


                             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.

               The Participant will vote the shares held in the Plan in the
          same manner as shares in certificated form.  Each Participant in
          the Plan will receive a Notice of the Annual Meeting, a Proxy
          Statement, a proxy voting card and the Company's Annual Report to
          Shareholders.  The proxy voting card will solicit proxies for the
          whole Plan shares held in a Participant's Plan account along with
          any certificated shares a Participant may hold in certificated
          form outside of the Plan.  

               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.

                                     -20-

<PAGE>

               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.

   
    
                                       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 for the three-month period ended
          March 31, 1998 and the six-month period ended June 30, 1998,
          incorporated by reference in this Prospectus, Pricewaterhouse
          Coopers LLP 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.  PricewaterhouseCoopers
          LLP 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. 
          PricewaterhouseCoopers LLP is not subject to the liability
          provisions of Section 11 of the Securities Act 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 PricewaterhouseCoopers LLP
          within the meaning of Sections 7 and 11 of the Securities Act.

    

                                     -21-


          <PAGE>


                               PARTICIPANT INFORMATION
                             UniSource Energy Corporation

           COMPANY HEADQUARTERS:        UniSource Energy
                                        Corporation
                                        220 West Sixth Street
                                        Tucson, AZ  85701
                                        (520) 571-4000

           ACCOUNT INFORMATION:
                --Stock Transfer        The Bank of New York
                Requirements, Plan and  Shareholder Relations Dept.
                Account Information:    11E
                                        P.O. Box 11258
                                        Church Street Station
                                        New York, NY 10286-1258


                --Telephone Number:     (888) 269-8845
                --Home page:            http:stock.bankofny.com
                --Email address:        shareowner-
                                        [email protected]

           Plan Transaction Processing  The Bank of New York
              Mailing Address:          Dividend Reinvestment
                                        Department
                                        P.O. Box 1958
                                        Newark, NJ  07101-1958


           OTHER COMPANY INFORMATION:   UniSource Energy
              --Mailing Address:        Corporation
                                        Investor Relations
                                        P.O. Box 711
                                        Tucson, AZ  85702

              --Telephone Number:       (520) 884-3661
              --Home Page:              [http:www.UniSourceEnergy.
                                        com]

              --Fax Number:             (520) 770-2015
              --Email address           [email protected]
              
           To Order Company Reports     UniSource Energy
                and Copies of           Corporation
                Incorporated            Records & Library Services-
                Documents:              DAB03
                                        P.O. Box 711
                                        Tucson, AZ  85702
                                        (520) 884-3781


           Stock Listing Information:
                --Ticker Symbol (NYSE   UNS
                & PEX):
                --Financial Listings    UniSrcEngy
                   (Wall Street Jrnl):

           CUSIP Number:                909205 10 6

                                     -22-


          <PAGE>



           =============================== ===============================
           NO PERSON HAS BEEN AUTHORIZED   UNISOURCE ENERGY CORPORATION
           TO GIVE ANY INFORMATION OR TO
           MAKE ANY REPRESENTATION OTHER
           THAN THOSE CONTAINED OR
           INCORPORATED BY REFERENCE IN
           THIS PROSPECTUS AND, IF GIVEN         INVESTMENT PLUS PLAN
           OR MADE, SUCH INFORMATION OR
           REPRESENTATION MUST NOT BE
           RELIED UPON AS HAVING BEEN
           AUTHORIZED BY UNISOURCE ENERGY            COMMON STOCK
           CORPORATION.  THIS PROSPECTUS          WITHOUT PAR VALUE
           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,              PROSPECTUS
           OR AN OFFER TO SELL, OR THE
           SOLICITATION OF AN OFFER TO
           BUY, SUCH SECURITIES IN ANY
           CIRCUMSTANCES IN WHICH SUCH
           OFFER OR SOLICITATION IS
           UNLAWFUL.  NEITHER THE DELIVERY         1,000,000 Shares
           OF THIS PROSPECTUS NOR ANY SALE
           MADE HEREUNDER SHALL, UNDER ANY
           CIRCUMSTANCES, CREATE ANY
           IMPLICATION THAT THE                   August      , 1998
           INFORMATION CONTAINED OR                     ------
           INCORPORATED BY REFERENCE
           HEREIN IS CORRECT AS OF ANY
           TIME SUBSEQUENT TO THE DATE OF
           SUCH INFORMATION.

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


          <PAGE>


                                       PART II
                        INFORMATION NOT REQUIRED IN PROSPECTUS

          ITEM 16. EXHIBITS

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

          <PAGE>


                                      SIGNATURES
   
               Pursuant to the requirements of the Securities Act of 1933,
          the Registrant certifies that it has reasonable grounds to
          believe that it meets all of the requirements for filing on Form
          S-3 and has duly caused this Pre-Effective Amendment No. 2 to its
          Registration Statement to be signed on its behalf by the
          undersigned, thereunto duly authorized to sign, in the City of
          Tucson, and the 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 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

                                    II-2

<PAGE>

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


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


          *    4(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).

          *    4(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).

          *    5(a)      --   Opinion of Dennis R. Nelson, Esq. (filed with
                              the Commission on August 6, 1998, as Exhibit
                              5(a) to Registrant's Pre-Effective Amendment
                              No. 1 to Form S-3 (File Number 333-31043-
                              99)).

          *    5(b)      --   Opinion of Thelen Reid & Priest LLP
               and 8          (filed with the Commission on August 6,
                              1998, as Exhibit 5(b) and 8 to
                              Registrant's Pre-Effective Amendment No.
                              1 to Form S-3 (File Number 333-31043-99)).

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

               15(b)     --   Letter of PricewaterhouseCoopers LLP
                              regarding unaudited interim financial
                              information.

          *    23(a)     --   The Consents of Dennis R. Nelson and
                              Thelen Reid & Priest LLP were contained
                              in their opinions as Exhibits 5(a) and
                              5(b) and 8, respectively.

               23(b)     --   Independent Auditors' Consent.    

          *    24        --   Power of Attorney is contained herein at
                              page II-4 of the previously filed
                              Amendment No. 1 to this Registration
                              Statement.




          --------------------------------------
          *  Previously filed.
    





                                                           Exhibit 15(a)



          UniSource Energy Corporation
          220 West Sixth Street
          Tucson, Arizona 85701

          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 and June 30, 1997 as indicated in our reports dated 
          February 23, 1998;  because we  did  not perform  an  audit, we  
          expressed  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. 2 to Registration 
          Statement No. 333-31043 of the Company on Form S-3.

          We are  also aware that  the aforementioned  report, pursuant  to
          Rule 436(c) under the Securities Act of 1933, is not considered a
          part  of the Registration Statements  prepared or certified by an
          accountant or  a report  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. 2
          to the Registration Statement on Form S-3 (No. 333-31043-99) 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







                                                              Exhibit 23(b)


          INDEPENDENT AUDITORS' CONSENT



          We  consent  to  the  incorporation  by reference  in  this  Pre-
          Effective Amendment No. 2 to Registration Statement No. 333-31043
          of UniSource Energy Corporation  on Form S-3 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 part of this Registration Statement.



          /s/ Deloitte & Touche LLP

          Deloitte & Touche LLP

          Tucson, Arizona
          August 14, 1998




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