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      Registration Statement
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>As
      filed with the Securities and Exchange Commission on January 31,
      2007</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Registration
      No. 333-<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>UNITED
      STATES</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>SECURITIES
      AND EXCHANGE COMMISSION</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>WASHINGTON,
      D.C. 20549</strong></font><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman"><strong>FORM
      S-8</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>REGISTRATION
      STATEMENT</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>UNDER
      THE SECURITIES ACT OF 1933</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>_________________</strong></font><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman"><strong>UniSource
      Energy Corporation</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Exact
      Name of Registrant as Specified in Its Charter)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td valign="top" width="39%" style="border-bottom: #ffffff thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Arizona
                </strong></font>
                <hr style="COLOR: black" align="center" noshade size="1" width="70%">
              </div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(State
                or other Jurisdiction of</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Incorporation
                or Organization)</font></div>
            </td>
            <td valign="top" width="39%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>86-0786732
                </strong></font>
                <hr style="COLOR: black" align="center" noshade size="1" width="70%">
              </div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(IRS
                Employer Identification No.)</font></div>
            </td>
          </tr>
          <tr>
            <td colspan="2" valign="top" width="79%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>One
                South Church Avenue, Suite 100</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Tucson,
                Arizona 85701 </strong></font>
                <hr style="COLOR: black" align="center" noshade size="1" width="85%">
              </div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Address
                of Principal Executive Offices)</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 15pt; FONT-FAMILY: Times New Roman"><strong>UniSource
      Energy Corporation </strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 15pt; FONT-FAMILY: Times New Roman"><strong>2006
      Omnibus Stock and Incentive Plan</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Full
      Title of the Plan)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Raymond
      S. Heyman, Esq.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Senior
      Vice President and General Counsel</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>c/o
      UniSource Energy Corporation</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>One
      South Church Avenue, Suite 100</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Tucson,
      Arizona 85701</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>(520)
      571-4000 </strong></font>
      <div>
        <hr style="COLOR: black" align="center" noshade size="1" width="100%">
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 27.35pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Name,
      Address and Telephone Number, Including Area Code, of Agent for
      Service)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>CALCULATION
      OF REGISTRATION FEE</strong></font></div>
    <div>
      <table border="1" bordercolor="black" cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td valign="bottom" width="13%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Title
                of</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>securities
                to be registered</strong></font></div>
            </td>
            <td valign="bottom" width="16%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Amount
                to be</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>registered</strong></font></div>
            </td>
            <td valign="bottom" width="18%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Proposed
                maximum</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>offering
                price</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>per
                share</strong></font></div>
            </td>
            <td valign="bottom" width="18%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Proposed
                maximum</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>aggregate</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>offering
                price</strong></font></div>
            </td>
            <td valign="bottom" width="13%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Amount
                of</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>registration
                fee</strong></font></div>
            </td>
          </tr>
          <tr bgcolor="#e2eef6">
            <td align="left" valign="top" width="13%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
                Common Stock,</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
                no par value</font></div>
            </td>
            <td valign="top" width="16%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">2,250,000
                shares (1)</font></div>
            </td>
            <td valign="top" width="18%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">$37.61
                (2)</font></div>
            </td>
            <td valign="top" width="18%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">$84,622,500</font></div>
            </td>
            <td valign="top" width="13%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">$9,054.61
                (2)</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 36pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(1)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font>&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
                to Rule 416(a) under the Securities Act of 1933, this Registration
                Statement also covers an indeterminate number of additional shares
                that
                may be offered and issued to prevent dilution resulting from stock
                splits,
                stock dividends or similar transactions as provided in the
                Plans.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 36pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(2)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font>&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Estimated
                solely for the purposes of calculating the registration fee, computed
                pursuant to Rules 457(c) and (h) under the Securities Act on the
                basis of
                the average of the high and low sale prices of a share of UniSource
                Energy
                Corporation Common Stock, as reported on the New York Stock Exchange
                on
                January 29, 2007.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
      <div>&#160;</div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>PART
      I</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>INFORMATION
      REQUIRED IN THE SECTION 10(a) PROSPECTUS</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      1.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Plan
      Information.*</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      2.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Registrant
      Information and Employee Plan Annual Information.*</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>*&#160;&#160;&#160;
      </strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">As
      permitted by Rule 428 under the Securities Act of 1933, this Registration
      Statement omits the information specified in Part I of Form S-8. The documents
      containing the information specified in Part I will be delivered to Plan
      participants as required by Rule 428(b). Such documents are not being filed
      with
      the Securities and Exchange Commission (the &#8220;Commission&#8221;) as part of this
      Registration Statement or as prospectuses or prospectus supplements pursuant
      to
      Rule 424(b) under the Securities Act.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>PART
      II</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>INFORMATION
      REQUIRED IN THE REGISTRATION STATEMENT</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      3.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Incorporation
      of Documents by Reference.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      following documents have been filed by UniSource Energy Corporation (&#8220;UEC,&#8221; the
&#8220;Registrant,&#8221; or the &#8220;Company&#8221;) and Tucson Electric Power. ( &#8220;TEP&#8221;) with the
      Commission pursuant to the Securities Exchange Act of 1934, as amended (the
      &#8220;Exchange Act&#8221;) and are hereby incorporated by reference in this Registration
      Statement:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
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          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 90pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(a)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;&#160;</font></td>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UEC
                and TEP&#8217;s Annual Report on combined Form 10-K (</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">File
                Nos. 1-13739 and 1-5924</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">)
                for the fiscal year ended December&#160;31, 2005, filed with the
                Commission on March 3, 2006;</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 90pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;&#160;</font></td>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UEC
                and TEP&#8217;s Quarterly Reports on combined Form 10-Q (File Nos. 1-13739 and
                1-5924) filed with the Commission on May&#160;5, 2006, August 9, 2006 and
                November 3, 2006;</font></div>
            </td>
          </tr>

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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 90pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(c)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UEC
                and TEP&#8217;s Current Reports on combined Form 8-K (File Nos. 1-13739 and
                1-5924) filed with the Commission on December 22, 2006, October 11,
                2006,
                August 18, 2006, August 15, 2006, July 5, 2006, June 27, 2006, June
                26,
                2006, June 12, 2006, June 6, 2006, May 25, 2006, April 12, 2006,
                February
                13, 2006, and January 31, 2006;</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 90pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(d)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UEC&#8217;s
                Current Reports on Form 8-K (File No. 1-13739) filed with the Commission
                on November 15, 2006, April 5, 2006, and March 28, 2006;
                </font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 90pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(e)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UEC&#8217;s
                Current Report on Form 8-K/A (File Nos. 1-13739) filed with the Commission
                on November 15, 2006; and</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 90pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(f)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;&#160;</font></td>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
                description of UEC&#8217;s Common Stock contained in Form 8-A, filed with the
                Commission on March 29, 1999, and any amendment or report filed for
                the
                purpose of updating such
                description.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
      addition, all documents subsequently filed by the Company or the Plan with
      the
      Commission pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act
      and prior to the filing of a post-effective amendment which indicates that
      all
      securities offered hereby have been sold or which deregisters all securities
      then remaining unsold, shall be deemed to be incorporated by reference in this
      Registration Statement and to be a part hereof from the date of filing of such
      documents. Any statement contained in a document, all or a portion of which
      is
      incorporated or deemed to be incorporated by reference herein, shall be deemed
      to be modified or superseded for purposes of this Registration Statement to
      the
      extent that a statement contained herein (or in any other subsequently filed
      document which also is or is deemed to be incorporated by reference herein)
      modifies or supersedes such statement. Any such statement so modified or
      superseded shall not be deemed, except as so modified or superseded, to
      constitute a part of this Registration Statement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">1</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Nothing
      in this Registration Statement shall be deemed to incorporate information
      furnished but not filed with the Commission pursuant to Item 2.02 or Item 7.01
      of Form 8-K.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      4.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Description
      of Securities.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company&#8217;s Common Stock, no par value, is registered pursuant to Section 12 of
      the Exchange Act, and, therefore, the description of securities is
      omitted.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      5.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Interests
      of Named Experts and Counsel.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      validity of the common stock offered hereby will be passed upon for us by
      Raymond S. Heyman, Esq., Senior Vice President and General Counsel of UniSource.
      As of December 31, 2006, Mr. Heyman beneficially owned approximately 953 shares
      of UniSource common stock and 69,910 options to acquire additional shares of
      UniSource common stock granted under option plans of UniSource.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      6.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Indemnification
      of Directors and Officers.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Arizona
      corporate law generally authorizes, on a non-exclusive basis, indemnification
      of
      officers and directors who have acted or failed to act, in good faith, in a
      manner believed to be in or not opposed to the best interest of the Company
      (with certain limitations in the case of actions by or in the right of the
      Company) and mandates such indemnification in the case of an officer or director
      who is successful on the merits or otherwise in defense of claims by reason
      of
      the fact or such status as an officer or director.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 45pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Article
      SIXTH of the Amended and Restated Articles of Incorporation of the Company
      provides, in part, that </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(B)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">No
      director of the Company shall be personally liable to the Company or its
      shareholders for money damages for any action taken or any failure to take
      any
      action as a Director; provided, however, that nothing herein shall be deemed
      to
      eliminate or limit any liability which may not be so eliminated or limited
      under
      the laws of the State of Arizona, as in effect at the effective date of this
      paragraph (B) of Article SIXTH or as thereafter amended. No amendment,
      modification or repeal of this paragraph (B) shall eliminate or limit the
      protection afforded by this paragraph (B) to a director with respect to any
      act
      or omission occurring before the effective date thereof.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(C)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(1)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company shall, to the maximum extent permitted by applicable law, as from time
      to time in effect, indemnify any individual who is or was a party to or
      otherwise involved in (or threatened to be made a party to or otherwise involved
      in) any Proceeding (as hereinafter defined) because such individual is or was
      a
      director or officer of the Company, or, while a director or officer of the
      Company, is or was serving at the request of the Company as a director, officer,
      partner, trustee, employee or agent of another foreign or domestic corporation,
      partnership, joint venture, trust, employee benefit plan or other enterprise,
      against all Liability (as hereinafter defined) incurred by such individual
      in
      connection with such Proceeding.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">As
      used
      in this paragraph (C) of Article SIXTH, (a) the term "Expenses" includes
      attorneys' fees and all other costs and expenses reasonably related to a
      Proceeding, (b) the term "Liability" means the obligation to pay a judgment,
      settlement, penalty or fine (including any excise tax assessed with respect
      to
      an employee benefit plan) and reasonable Expenses incurred with respect to
      a
      Proceeding, and includes without limitation obligations and Expenses that have
      not yet been paid but that have been or may be incurred, and (c) the term
      "Proceeding" means any threatened, pending or completed action, suit or
      proceeding, whether civil, criminal, administrative or investigative and whether
      formal or informal, including without limitation any action, suit or proceeding
      by or in the right of the Company and including, further, any appeal in
      connection with any such action, suit or proceeding.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(2)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company shall, to the maximum extent permitted by applicable law, pay any
      Expenses incurred by a director or officer of the Company in defending any
      such
      Proceeding in advance of the final disposition thereof upon receipt of any
      undertaking by or on behalf of such individual to repay such advances if it
      is
      ultimately determined that such individual did not meet</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div id="PGBRK" style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
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      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">2</font></div>
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    <div>&#160;</div>
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        standard of conduct prescribed by applicable law and upon the satisfaction
        of
        such other conditions as may be imposed by applicable law.</font></div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(3)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company by resolution of the Board of Directors, may extend the benefits of
      this
      paragraph (C) of Article SIXTH to employees and agents of the Company (each
      individual entitled to benefits under this paragraph (C) being hereinafter
      sometimes called an "Indemnified Person").</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(4)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">All
      rights to indemnification and to the advancement of expenses granted under
      or
      pursuant to this paragraph (C) shall be deemed to arise out of a contract
      between the Company and each person who is an Indemnified Person at any time
      while this paragraph (C) is in effect any may be evidenced by a separate
      contract between the Company and each Indemnified Person; and such rights shall
      be effective in respect of all Proceedings commenced after the effective date
      of
      this paragraph (C), whether arising from acts or omissions occurring before
      or
      after such date. No amendment, modification or repeal of this Article shall
      affect any rights or obligations theretofore existing.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(5)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company may purchase and maintain insurance on behalf of, or insure or cause
      to
      be insured, any individual who is an Indemnified Person against any Liability
      asserted against or incurred by him in any capacity in respect of which he
      is an
      Indemnified Person, or arising out of his status in such capacity, whether
      or
      not the Company would have the power to indemnify him against such liability
      under this Article. The Company's indemnity of any individual who is an
      Indemnified Person shall be reduced by any amounts such individual may collect
      with respect to such liability (a) under any policy of insurance purchased
      and
      maintained on his behalf by the Company or (b) from any other entity or
      enterprise served by such individual.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(6)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      rights to indemnification and to the advancement of Expenses and all other
      benefits provided by, or granted pursuant to, this Article shall continue as
      to
      a person who has ceased to serve in the capacity in respect of which such person
      was an Indemnified Person and shall inure to the benefit of the heirs, executors
      and administrators of such person.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(7)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Board
      of Directors shall have the power and authority to make, alter, amend and repeal
      such procedural rules and regulations relating to indemnification and the
      advancement of Expenses as it, in its discretion, may deem necessary or
      expedient in order to carry out the purposes of this Article, such rules and
      regulations, if any, to be set forth in the Bylaws of the Company or in a
      resolution of the Board of Directors.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      7.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Exemption
      From Registration Claimed.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Not
      applicable.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      8.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Exhibits.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      following is a complete list of exhibits filed as a part of this Registration
      Statement:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div align="left">
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td valign="top" width="10%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Exhibit
                No.</u></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="64%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Description</u></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="10%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">4.1</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="64%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UniSource
                Energy Corporation 2006 Omnibus Stock and Incentive Plan (incorporated
                herein by reference to Appendix A of UniSource&#8217;s Proxy Statement, filed
                with the Commission on April 3, 2006)</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="10%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">4.2</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="64%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a href="exhibit4-2.htm">Form
                of Non-Qualified Stock Option
                Agreement</a></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="10%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">4.3</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="64%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a href="exhibit4-3.htm">Form
                of Performance Share Agreement</a></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="10%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">5.1</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="64%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a href="exhibit5-1.htm">Opinion
                of Counsel</a></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>

      </table>
    </div>
    <div>&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">3</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div>&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td valign="top" width="10%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">15.1</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="64%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a href="exhibit15-1.htm">Letter
                re unaudited interim financial
                information</a></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="10%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">23.1</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="64%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a href="exhibit23-1.htm">Consent
                of PricewaterhouseCoopers
                LLP</a></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="10%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">23.2</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="64%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Consent
                of Counsel (filed as part of Exhibit 5.1)</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      9.<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Undertakings</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 54pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(a)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      undersigned Registrant hereby undertakes:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 54pt; TEXT-INDENT: 45pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(1)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">To
      file,
      during any period in which offers or sales are being made, a post-effective
      amendment to this Registration Statement:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 162pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(i)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font>&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">to
                include any prospectus required by Section 10(a)(3) of the Securities
                Act
                of 1933;</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 162pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(ii)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font>&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">to
                reflect in the prospectus any facts or events arising after the effective
                date of the Registration Statement (or the most recent post-effective
                amendment thereof) which, individually or in the aggregate, represent
                a
                fundamental change in the information set forth in the Registration
                Statement; and</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 162pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(iii)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font>&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">to
                include any material information with respect to the plan of distribution
                not previously disclosed in the registration statement or any material
                change to such information in the registration statement;
                </font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 54pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>provided,
      however</em></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">,
      that if
      the information required to be included in a post-effective amendment by
      paragraphs (1)(i) and (ii) above is contained in periodic reports filed with
      or
      furnished to the Commission by the registrant pursuant to Section 13 or Section
      15(d) of the Securities Exchange Act of 1934 that are incorporated by reference
      in this Registration Statement, paragraphs (1)(i) and (ii) shall not
      apply;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 54pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(2)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">That,
      for
      the purpose of determining any liability under the Securities Act of 1933,
      each
      such post-effective amendment shall be deemed to be a new registration statement
      relating to the securities offered therein, and the offering of such securities
      at that time shall be deemed to be the initial </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>bona
      fide</em></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      offering
      thereof; and</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 54pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(3)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">To
      remove
      from registration by means of a post-effective amendment any of the securities
      being registered which remain unsold at the termination of the
      offering.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 54pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      undersigned Registrant hereby undertakes that, for purposes of determining
      any
      liability under the Securities Act, each filing of the Registrant&#8217;s annual
      report pursuant to Section 13(a) or Section 15(d) of the Exchange Act that
      is
      incorporated by reference in this Registration Statement shall be deemed to
      be a
      new registration statement relating to the securities offered therein, and
      the
      offering of such securities at that time shall be deemed to be the initial
      </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>bona
      fide </em></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">offering
      thereof.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 54pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(c)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Insofar
      as indemnification for liabilities arising under the Securities Act may be
      permitted to directors, officers and controlling persons of the Registrant
      pursuant to the provisions described under Item 6 above, or otherwise, the
      Registrant has been advised that in the opinion of the Securities and Exchange
      Commission such indemnification is against public policy as expressed in the
      Securities Act and is, therefore, unenforceable. In the event that a claim
      for
      indemnification against such liabilities (other than the payment by the
      Registrant of expenses incurred or paid by a director, officer or controlling
      person of the Registrant in the successful defense of any action, suit or
      proceeding) is asserted by such director, officer or controlling person in
      connection with the securities being registered, the Registrant will, unless
      in
      the opinion of its counsel the matter has been settled by controlling precedent,
      submit to a court of appropriate jurisdiction the question whether such
      indemnification by it is against public policy as expressed in the Securities
      Act and will be governed by the final adjudication of such issue.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
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      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">4</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
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                Kevin P. Larson</font></div>
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          <tr>
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                Karen G. Kissinger</font></div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;<font size="2">January
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          <tr>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Lawrence
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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            <td valign="middle" width="27%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
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[{"type": "S-8", "sequence": "1", "filename": "forms-8.htm", "description": "REGISTRATION STATEMENT", "secsgml_size_bytes": 108267}]
{"company-data": {"conformed-name": "UNISOURCE ENERGY CORP", "cik": "0000941138", "assigned-sic": "4911", "irs-number": "860786732", "state-of-incorporation": "AZ", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-140353", "film-number": "07567974"}, "business-address": {"street1": "ONE SOUTH CHURCH AVENUE", "street2": "SUITE 100", "city": "TUCSON", "state": "AZ", "zip": "85701", "phone": "520-571-4000"}, "mail-address": {"street1": "ONE SOUTH CHURCH AVENUE, SUITE 100", "street2": "P.O. BOX 711", "city": "TUCSON", "state": "AZ", "zip": "85702"}}
Registration Statement
As
      filed with the Securities and Exchange Commission on January 31,
      2007
Registration
      No. 333-
UNITED
      STATES
SECURITIES
      AND EXCHANGE COMMISSION
WASHINGTON,
      D.C. 20549
FORM
      S-8
REGISTRATION
      STATEMENT
UNDER
      THE SECURITIES ACT OF 1933
_________________
UniSource
      Energy Corporation
(Exact
      Name of Registrant as Specified in Its Charter)
Arizona
(State
                or other Jurisdiction of
Incorporation
                or Organization)
86-0786732
(IRS
                Employer Identification No.)
One
                South Church Avenue, Suite 100
Tucson,
                Arizona 85701
(Address
                of Principal Executive Offices)
UniSource
      Energy Corporation
2006
      Omnibus Stock and Incentive Plan
(Full
      Title of the Plan)
Raymond
      S. Heyman, Esq.
Senior
      Vice President and General Counsel
c/o
      UniSource Energy Corporation
One
      South Church Avenue, Suite 100
Tucson,
      Arizona 85701
(520)
      571-4000
(Name,
      Address and Telephone Number, Including Area Code, of Agent for
      Service)
CALCULATION
      OF REGISTRATION FEE
Title
                of
securities
                to be registered
Amount
                to be
registered
Proposed
                maximum
offering
                price
per
                share
Proposed
                maximum
aggregate
offering
                price
Amount
                of
registration
                fee
Common Stock,
no par value
2,250,000
                shares (1)
$37.61
                (2)
$84,622,500
$9,054.61
                (2)
(1)
Pursuant
                to Rule 416(a) under the Securities Act of 1933, this Registration
                Statement also covers an indeterminate number of additional shares
                that
                may be offered and issued to prevent dilution resulting from stock
                splits,
                stock dividends or similar transactions as provided in the
                Plans.
(2)
Estimated
                solely for the purposes of calculating the registration fee, computed
                pursuant to Rules 457(c) and (h) under the Securities Act on the
                basis of
                the average of the high and low sale prices of a share of UniSource
                Energy
                Corporation Common Stock, as reported on the New York Stock Exchange
                on
                January 29, 2007.
PART
      I
INFORMATION
      REQUIRED IN THE SECTION 10(a) PROSPECTUS
Item
      1.
Plan
      Information.*
Item
      2.
Registrant
      Information and Employee Plan Annual Information.*
*
As
      permitted by Rule 428 under the Securities Act of 1933, this Registration
      Statement omits the information specified in Part I of Form S-8. The documents
      containing the information specified in Part I will be delivered to Plan
      participants as required by Rule 428(b). Such documents are not being filed
      with
      the Securities and Exchange Commission (the "Commission") as part of this
      Registration Statement or as prospectuses or prospectus supplements pursuant
      to
      Rule 424(b) under the Securities Act.
PART
      II
INFORMATION
      REQUIRED IN THE REGISTRATION STATEMENT
Item
      3.
Incorporation
      of Documents by Reference.
The
      following documents have been filed by UniSource Energy Corporation ("UEC," the
"Registrant," or the "Company") and Tucson Electric Power. ( "TEP") with the
      Commission pursuant to the Securities Exchange Act of 1934, as amended (the
      "Exchange Act") and are hereby incorporated by reference in this Registration
      Statement:
(a)
UEC
                and TEP's Annual Report on combined Form 10-K (
File
                Nos. 1-13739 and 1-5924
)
                for the fiscal year ended December 31, 2005, filed with the
                Commission on March 3, 2006;
(b)
UEC
                and TEP's Quarterly Reports on combined Form 10-Q (File Nos. 1-13739 and
                1-5924) filed with the Commission on May 5, 2006, August 9, 2006 and
                November 3, 2006;
(c)
UEC
                and TEP's Current Reports on combined Form 8-K (File Nos. 1-13739 and
                1-5924) filed with the Commission on December 22, 2006, October 11,
                2006,
                August 18, 2006, August 15, 2006, July 5, 2006, June 27, 2006, June
                26,
                2006, June 12, 2006, June 6, 2006, May 25, 2006, April 12, 2006,
                February
                13, 2006, and January 31, 2006;
(d)
UEC's
                Current Reports on Form 8-K (File No. 1-13739) filed with the Commission
                on November 15, 2006, April 5, 2006, and March 28, 2006;
(e)
UEC's
                Current Report on Form 8-K/A (File Nos. 1-13739) filed with the Commission
                on November 15, 2006; and
(f)
The
                description of UEC's Common Stock contained in Form 8-A, filed with the
                Commission on March 29, 1999, and any amendment or report filed for
                the
                purpose of updating such
                description.
In
      addition, all documents subsequently filed by the Company or the Plan with
      the
      Commission pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act
      and prior to the filing of a post-effective amendment which indicates that
      all
      securities offered hereby have been sold or which deregisters all securities
      then remaining unsold, shall be deemed to be incorporated by reference in this
      Registration Statement and to be a part hereof from the date of filing of such
      documents. Any statement contained in a document, all or a portion of which
      is
      incorporated or deemed to be incorporated by reference herein, shall be deemed
      to be modified or superseded for purposes of this Registration Statement to
      the
      extent that a statement contained herein (or in any other subsequently filed
      document which also is or is deemed to be incorporated by reference herein)
      modifies or supersedes such statement. Any such statement so modified or
      superseded shall not be deemed, except as so modified or superseded, to
      constitute a part of this Registration Statement.
1
Nothing
      in this Registration Statement shall be deemed to incorporate information
      furnished but not filed with the Commission pursuant to Item 2.02 or Item 7.01
      of Form 8-K.
Item
      4.
Description
      of Securities.
The
      Company's Common Stock, no par value, is registered pursuant to Section 12 of
      the Exchange Act, and, therefore, the description of securities is
      omitted.
Item
      5.
Interests
      of Named Experts and Counsel.
The
      validity of the common stock offered hereby will be passed upon for us by
      Raymond S. Heyman, Esq., Senior Vice President and General Counsel of UniSource.
      As of December 31, 2006, Mr. Heyman beneficially owned approximately 953 shares
      of UniSource common stock and 69,910 options to acquire additional shares of
      UniSource common stock granted under option plans of UniSource.
Item
      6.
Indemnification
      of Directors and Officers.
Arizona
      corporate law generally authorizes, on a non-exclusive basis, indemnification
      of
      officers and directors who have acted or failed to act, in good faith, in a
      manner believed to be in or not opposed to the best interest of the Company
      (with certain limitations in the case of actions by or in the right of the
      Company) and mandates such indemnification in the case of an officer or director
      who is successful on the merits or otherwise in defense of claims by reason
      of
      the fact or such status as an officer or director.
Article
      SIXTH of the Amended and Restated Articles of Incorporation of the Company
      provides, in part, that
(B)
No
      director of the Company shall be personally liable to the Company or its
      shareholders for money damages for any action taken or any failure to take
      any
      action as a Director; provided, however, that nothing herein shall be deemed
      to
      eliminate or limit any liability which may not be so eliminated or limited
      under
      the laws of the State of Arizona, as in effect at the effective date of this
      paragraph (B) of Article SIXTH or as thereafter amended. No amendment,
      modification or repeal of this paragraph (B) shall eliminate or limit the
      protection afforded by this paragraph (B) to a director with respect to any
      act
      or omission occurring before the effective date thereof.
(C)
(1)
The
      Company shall, to the maximum extent permitted by applicable law, as from time
      to time in effect, indemnify any individual who is or was a party to or
      otherwise involved in (or threatened to be made a party to or otherwise involved
      in) any Proceeding (as hereinafter defined) because such individual is or was
      a
      director or officer of the Company, or, while a director or officer of the
      Company, is or was serving at the request of the Company as a director, officer,
      partner, trustee, employee or agent of another foreign or domestic corporation,
      partnership, joint venture, trust, employee benefit plan or other enterprise,
      against all Liability (as hereinafter defined) incurred by such individual
      in
      connection with such Proceeding.
As
      used
      in this paragraph (C) of Article SIXTH, (a) the term "Expenses" includes
      attorneys' fees and all other costs and expenses reasonably related to a
      Proceeding, (b) the term "Liability" means the obligation to pay a judgment,
      settlement, penalty or fine (including any excise tax assessed with respect
      to
      an employee benefit plan) and reasonable Expenses incurred with respect to
      a
      Proceeding, and includes without limitation obligations and Expenses that have
      not yet been paid but that have been or may be incurred, and (c) the term
      "Proceeding" means any threatened, pending or completed action, suit or
      proceeding, whether civil, criminal, administrative or investigative and whether
      formal or informal, including without limitation any action, suit or proceeding
      by or in the right of the Company and including, further, any appeal in
      connection with any such action, suit or proceeding.
(2)
The
      Company shall, to the maximum extent permitted by applicable law, pay any
      Expenses incurred by a director or officer of the Company in defending any
      such
      Proceeding in advance of the final disposition thereof upon receipt of any
      undertaking by or on behalf of such individual to repay such advances if it
      is
      ultimately determined that such individual did not meet
2
any
        standard of conduct prescribed by applicable law and upon the satisfaction
        of
        such other conditions as may be imposed by applicable law.
(3)
The
      Company by resolution of the Board of Directors, may extend the benefits of
      this
      paragraph (C) of Article SIXTH to employees and agents of the Company (each
      individual entitled to benefits under this paragraph (C) being hereinafter
      sometimes called an "Indemnified Person").
(4)
All
      rights to indemnification and to the advancement of expenses granted under
      or
      pursuant to this paragraph (C) shall be deemed to arise out of a contract
      between the Company and each person who is an Indemnified Person at any time
      while this paragraph (C) is in effect any may be evidenced by a separate
      contract between the Company and each Indemnified Person; and such rights shall
      be effective in respect of all Proceedings commenced after the effective date
      of
      this paragraph (C), whether arising from acts or omissions occurring before
      or
      after such date. No amendment, modification or repeal of this Article shall
      affect any rights or obligations theretofore existing.
(5)
The
      Company may purchase and maintain insurance on behalf of, or insure or cause
      to
      be insured, any individual who is an Indemnified Person against any Liability
      asserted against or incurred by him in any capacity in respect of which he
      is an
      Indemnified Person, or arising out of his status in such capacity, whether
      or
      not the Company would have the power to indemnify him against such liability
      under this Article. The Company's indemnity of any individual who is an
      Indemnified Person shall be reduced by any amounts such individual may collect
      with respect to such liability (a) under any policy of insurance purchased
      and
      maintained on his behalf by the Company or (b) from any other entity or
      enterprise served by such individual.
(6)
The
      rights to indemnification and to the advancement of Expenses and all other
      benefits provided by, or granted pursuant to, this Article shall continue as
      to
      a person who has ceased to serve in the capacity in respect of which such person
      was an Indemnified Person and shall inure to the benefit of the heirs, executors
      and administrators of such person.
(7)
The
      Board
      of Directors shall have the power and authority to make, alter, amend and repeal
      such procedural rules and regulations relating to indemnification and the
      advancement of Expenses as it, in its discretion, may deem necessary or
      expedient in order to carry out the purposes of this Article, such rules and
      regulations, if any, to be set forth in the Bylaws of the Company or in a
      resolution of the Board of Directors.
Item
      7.
Exemption
      From Registration Claimed.
Not
      applicable.
Item
      8.
Exhibits.
The
      following is a complete list of exhibits filed as a part of this Registration
      Statement:
Exhibit
                No.
Description
4.1
UniSource
                Energy Corporation 2006 Omnibus Stock and Incentive Plan (incorporated
                herein by reference to Appendix A of UniSource's Proxy Statement, filed
                with the Commission on April 3, 2006)
4.2
Form
                of Non-Qualified Stock Option
                Agreement
4.3
Form
                of Performance Share Agreement
5.1
Opinion
                of Counsel
3
15.1
Letter
                re unaudited interim financial
                information
23.1
Consent
                of PricewaterhouseCoopers
                LLP
23.2
Consent
                of Counsel (filed as part of Exhibit 5.1)
Item
      9.
Undertakings
(a)
The
      undersigned Registrant hereby undertakes:
(1)
To
      file,
      during any period in which offers or sales are being made, a post-effective
      amendment to this Registration Statement:
(i)
to
                include any prospectus required by Section 10(a)(3) of the Securities
                Act
                of 1933;
(ii)
to
                reflect in the prospectus any facts or events arising after the effective
                date of the Registration Statement (or the most recent post-effective
                amendment thereof) which, individually or in the aggregate, represent
                a
                fundamental change in the information set forth in the Registration
                Statement; and
(iii)
to
                include any material information with respect to the plan of distribution
                not previously disclosed in the registration statement or any material
                change to such information in the registration statement;
provided,
      however
,
      that if
      the information required to be included in a post-effective amendment by
      paragraphs (1)(i) and (ii) above is contained in periodic reports filed with
      or
      furnished to the Commission by the registrant pursuant to Section 13 or Section
      15(d) of the Securities Exchange Act of 1934 that are incorporated by reference
      in this Registration Statement, paragraphs (1)(i) and (ii) shall not
      apply;
(2)
That,
      for
      the purpose of determining any liability under the Securities Act of 1933,
      each
      such post-effective amendment shall be deemed to be a new registration statement
      relating to the securities offered therein, and the offering of such securities
      at that time shall be deemed to be the initial
bona
      fide
offering
      thereof; and
(3)
To
      remove
      from registration by means of a post-effective amendment any of the securities
      being registered which remain unsold at the termination of the
      offering.
(b)
The
      undersigned Registrant hereby undertakes that, for purposes of determining
      any
      liability under the Securities Act, each filing of the Registrant's annual
      report pursuant to Section 13(a) or Section 15(d) of the Exchange Act that
      is
      incorporated by reference in this Registration Statement shall be deemed to
      be a
      new registration statement relating to the securities offered therein, and
      the
      offering of such securities at that time shall be deemed to be the initial
bona
      fide
offering
      thereof.
(c)
Insofar
      as indemnification for liabilities arising under the Securities Act may be
      permitted to directors, officers and controlling persons of the Registrant
      pursuant to the provisions described under Item 6 above, or otherwise, the
      Registrant has been advised that in the opinion of the Securities and Exchange
      Commission such indemnification is against public policy as expressed in the
      Securities Act and is, therefore, unenforceable. In the event that a claim
      for
      indemnification against such liabilities (other than the payment by the
      Registrant of expenses incurred or paid by a director, officer or controlling
      person of the Registrant in the successful defense of any action, suit or
      proceeding) is asserted by such director, officer or controlling person in
      connection with the securities being registered, the Registrant will, unless
      in
      the opinion of its counsel the matter has been settled by controlling precedent,
      submit to a court of appropriate jurisdiction the question whether such
      indemnification by it is against public policy as expressed in the Securities
      Act and will be governed by the final adjudication of such issue.
4
SIGNATURES
Pursuant
      to the requirements of the Securities Act of 1933, as amended, the Registrant
      certifies that it has reasonable grounds to believe that it meets all the
      requirements for filing on Form S-8 and has duly caused this Registration
      Statement to be signed on its behalf by the undersigned, thereunto duly
      authorized, in the City of Tucson, State of Arizona, on January 31,
      2007.
UNISOURCE
                ENERGY CORPORATION
By:
/s/
                James S. Pignatelli
Name:
James
                S. Pignatelli
Title:
Chairman,
                President and Chief Executive Officer
(Principal
                Executive Officer)
By:
/s/
                Kevin P. Larson
Name:
Kevin
                P. Larson
Title:
Senior
                Vice President, Chief Financial Officer, and Treasurer
(Principal
                Financial Officer)
By:
/s/
                Karen G. Kissinger
Name:
Karen
                G. Kissinger
Title:
Vice
                President, Controller, and Chief Compliance Officer
(Principal
                Accounting Officer)
Pursuant
      to the requirements of the Securities Act of 1933, as amended, this Registration
      Statement has been signed by the following persons in the capacities and on
      the
      dates indicated.
Signature
Title
Date
/s/
                Lawrence J. Aldrich
Director
January
                31, 2007
Lawrence
                J. Aldrich
/s/
                Barbara M. Baumann
Director
January
                31, 2007
Barbara
                M. Baumann
/s/
                Larry W. Bickle
Director
January
                31, 2007
Larry
                W. Bickle
/s/
                Elizabeth T. Bilby
Director
January
                31, 2007
Elizabeth
                T. Bilby
/s/
                Harold W. Burlingame
Director
January
                31, 2007
Harold
                W. Burlingame
/s/
                John L. Carter
Director
January
                31, 2007
John
                L. Carter
/s/
                Robert A. Elliott
Director
January
                31, 2007
Robert
                A. Elliott
/s/
                Daniel W. L. Fessler
Director
January
                31, 2007
Daniel
                W. L. Fessler
/s/
                Kenneth Handy
Director
January
                31, 2007
Kenneth
                Handy
/s/
                Warren Y. Jobe
Director
January
                31, 2007
Warren
                Y. Jobe
/s/
                Joaquin Ruiz
Director
January
                31, 2007
Joaquin
                Ruiz