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<TITLE>Filed by Bowne Pure Compliance</TITLE>
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<P style="font-size: 14pt" align="center"><B>UNITED STATES<BR>
SECURITIES AND
EXCHANGE COMMISSION<BR>
<FONT style="font-size: 12pt">Washington, D.C. 20549
</FONT></B>

<P style="font-size: 18pt" align="center"><B>FORM 8-K</B>

<P style="font-size: 12pt" align="center"><B>CURRENT REPORT<BR>
Pursuant to
Section 13 or 15(d) of the Securities Exchange Act of 1934</B>

<P style="font-size: 10pt" align="center"><B>Date of Report (Date of earliest
event reported): December 4, 2008</B>

<P style="font-size: 24pt" align="center"><B>UNISOURCE ENERGY CORPORATION</B> <FONT
style="font-size: 10pt"><BR>(Exact name of registrant as specified in its charter)
</FONT>
<TABLE style="font-size: 10pt; text-align: center" cellspacing="0"
cellpadding="0" width="100%" border="0">

 <TR>
  <TD width="32%">&nbsp;</TD>
  <TD width="1%">&nbsp;</TD>
  <TD width="33%">&nbsp;</TD>
  <TD width="1%">&nbsp;</TD>
  <TD width="32%">&nbsp;</TD>
 </TR>
 <TR valign="bottom">
  <TD style="border-bottom: #000000 1px solid"><B>(An Arizona Corporation)</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>1-13739</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>86-0786732</B></TD>
 </TR>
 <TR valign="top">
  <TD>(State or other Jurisdiction of Incorporation)</TD>
  <TD>&nbsp;</TD>
  <TD>(Commission File Number)</TD>
  <TD>&nbsp;</TD>
  <TD>(IRS Employer Identification No.)</TD>
 </TR>

</TABLE>

<TABLE style="font-size: 10pt; text-align: center" cellspacing="0"
cellpadding="0" width="100%" border="0">

 <TR>
  <TD width="49%">&nbsp;</TD>
  <TD width="1%">&nbsp;</TD>
  <TD width="49%">&nbsp;</TD>
 </TR>
 <TR valign="bottom">
  <TD style="border-bottom: #000000 1px solid"><B>One South Church Avenue, Suite 100, <BR>Tucson, AZ
</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>85701</B></TD>
 </TR>
 <TR valign="top">
  <TD>(Address of Principal Executive Offices)</TD>
  <TD>&nbsp;</TD>
  <TD>(Zip Code)</TD>
 </TR>

</TABLE>


<P style="font-size: 10pt" align="center">Registrant&#8217;s telephone number,
including area code: <B>(520) 571-4000</B>
<TABLE style="font-size: 10pt; text-align: center" cellspacing="0"
cellpadding="0" width="30%" border="0">

 <TR>
  <TD width="100%">&nbsp;</TD>
 </TR>
 <TR>
  <TD style="border-bottom: #000000 1px solid" nowrap><B>&nbsp;</B></TD>
 </TR>
 <TR>
  <TD nowrap>(Former name or former address if changed since last report.)</TD>
 </TR>

</TABLE>

<P style="font-size: 24pt" align="center"><B>TUCSON ELECTRIC POWER COMPANY</B> <FONT
style="font-size: 10pt"><BR>(Exact name of registrant as specified in its charter)
</FONT>
<TABLE style="font-size: 10pt; text-align: center" cellspacing="0"
cellpadding="0" width="100%" border="0">

 <TR>
  <TD width="32%">&nbsp;</TD>
  <TD width="1%">&nbsp;</TD>
  <TD width="33%">&nbsp;</TD>
  <TD width="1%">&nbsp;</TD>
  <TD width="32%">&nbsp;</TD>
 </TR>
 <TR valign="bottom">
  <TD style="border-bottom: #000000 1px solid"><B>(An Arizona Corporation)</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>1-5924</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>86-0062700</B></TD>
 </TR>
 <TR valign="top">
  <TD>(State or other Jurisdiction of Incorporation)</TD>
  <TD>&nbsp;</TD>
  <TD>(Commission File Number)</TD>
  <TD>&nbsp;</TD>
  <TD>(IRS Employer Identification No.)</TD>
 </TR>

</TABLE>

<TABLE style="font-size: 10pt; text-align: center" cellspacing="0"
cellpadding="0" width="100%" border="0">

 <TR>
  <TD width="49%">&nbsp;</TD>
  <TD width="1%">&nbsp;</TD>
  <TD width="49%">&nbsp;</TD>
 </TR>
 <TR valign="bottom">
  <TD style="border-bottom: #000000 1px solid"><B>One South Church Avenue, Suite 100, <BR>Tucson, AZ
</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>85701</B></TD>
 </TR>
 <TR valign="top">
  <TD>(Address of Principal Executive Offices)</TD>
  <TD>&nbsp;</TD>
  <TD>(Zip Code)</TD>
 </TR>

</TABLE>


<P style="font-size: 10pt" align="center">Registrant&#8217;s telephone number,
including area code: <B>(520) 571-4000</B>
<TABLE style="font-size: 10pt; text-align: center" cellspacing="0"
cellpadding="0" width="30%" border="0">

 <TR>
  <TD width="100%">&nbsp;</TD>
 </TR>
 <TR>
  <TD style="border-bottom: #000000 1px solid" nowrap><B>&nbsp;</B></TD>
 </TR>
 <TR>
  <TD nowrap>(Former name or former address if changed since last report.)</TD>
 </TR>

</TABLE>
<P style="font-size: 10pt" align="left">Check the appropriate box below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions:

<P style="font-size: 10pt" align="left"><FONT face="Wingdings">o</FONT> Written
communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425)<BR>
<BR>
<FONT face="Wingdings">o</FONT> Soliciting material pursuant
to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)<BR>
<BR>
<FONT
face="Wingdings">o</FONT> Pre-commencement communications pursuant to Rule
14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))<BR>
<BR>
<FONT
face="Wingdings">o</FONT> Pre-commencement communications pursuant to Rule
13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))<BR>


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<P style="font-size: 10pt" align="center">&nbsp;

<P style="display: none; font-size: 10pt" align="center">1
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<P style="font-size: 10pt" align="left"><U><B>Item&nbsp;5.02. Departure of
Directors or Certain Officers; Election of Directors; Appointment of Certain
Officers; Compensatory Arrangements of Certain Officers.</B></U>

<P style="font-size: 10pt" align="left">On December&nbsp;4, 2008, James S.
Pignatelli, Chairman of the Board, President and Chief Executive Officer of
UniSource Energy Corporation (UniSource Energy) and Tucson Electric Power
Company (TEP)&nbsp;announced his retirement as Chairman, President and Chief
Executive Officer, effective December&nbsp;31, 2008.

<P style="font-size: 10pt" align="left">Mr.&nbsp;Pignatelli joined TEP in
September&nbsp;1994 as Senior Vice President. On July&nbsp;6, 1998,
Mr.&nbsp;Pignatelli was named Chairman, President and Chief Executive Officer
of UniSource Energy and TEP.

<P style="font-size: 10pt" align="left">As stated in the Form 8-K filed on
September&nbsp;5, 2008, the Board of Directors of UniSource Energy is engaged
in the process of identifying a successor to Mr.&nbsp;Pignatelli. The
Company expects to announce a successor very soon.

<P style="font-size: 10pt" align="center">&nbsp;

<P style="display: none; font-size: 10pt" align="center">2
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<DIV align="center" style="font-size: 10pt; margin-top: 10pt"><B>SIGNATURES</B>
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 10pt">Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to
be signed on its behalf by the undersigned thereunto duly authorized.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
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    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
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    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">Date: December 10, 2008</TD>
    <TD colspan="3" align="left"><u><B>UNISOURCE ENERGY CORPORATION</B></u><BR>
(Registrant) <BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" style="border-bottom: 1px solid #000000" align="left">/s/  Kevin P. Larson
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left" nowrap>Senior Vice President and Chief Financial Officer  &nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">Date: December 10, 2008</TD>
    <TD colspan="3" align="left"><u><B>TUCSON ELECTRIC POWER COMPANY</B></u> <BR>
(Registrant) <BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" style="border-bottom: 1px solid #000000" align="left">/s/  Kevin P. Larson
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left" nowrap>Senior Vice President and Chief Financial Officer  &nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>

<P style="font-size: 10pt" align="center">&nbsp;

<P style="display: none; font-size: 10pt" align="center">3
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Filed by Bowne Pure Compliance
UNITED STATES
SECURITIES AND
EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to
Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest
event reported): December 4, 2008
UNISOURCE ENERGY CORPORATION
(Exact name of registrant as specified in its charter)
(An Arizona Corporation)
1-13739
86-0786732
(State or other Jurisdiction of Incorporation)
(Commission File Number)
(IRS Employer Identification No.)
One South Church Avenue, Suite 100,
Tucson, AZ
85701
(Address of Principal Executive Offices)
(Zip Code)
Registrant's telephone number,
including area code:
(520) 571-4000
(Former name or former address if changed since last report.)
TUCSON ELECTRIC POWER COMPANY
(Exact name of registrant as specified in its charter)
(An Arizona Corporation)
1-5924
86-0062700
(State or other Jurisdiction of Incorporation)
(Commission File Number)
(IRS Employer Identification No.)
One South Church Avenue, Suite 100,
Tucson, AZ
85701
(Address of Principal Executive Offices)
(Zip Code)
Registrant's telephone number,
including area code:
(520) 571-4000
(Former name or former address if changed since last report.)
Check the appropriate box below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions:
o
Written
communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425)
o
Soliciting material pursuant
to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule
14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule
13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 5.02. Departure of
Directors or Certain Officers; Election of Directors; Appointment of Certain
Officers; Compensatory Arrangements of Certain Officers.
On December 4, 2008, James S.
Pignatelli, Chairman of the Board, President and Chief Executive Officer of
UniSource Energy Corporation (UniSource Energy) and Tucson Electric Power
Company (TEP) announced his retirement as Chairman, President and Chief
Executive Officer, effective December 31, 2008.
Mr. Pignatelli joined TEP in
September 1994 as Senior Vice President. On July 6, 1998,
Mr. Pignatelli was named Chairman, President and Chief Executive Officer
of UniSource Energy and TEP.
As stated in the Form 8-K filed on
September 5, 2008, the Board of Directors of UniSource Energy is engaged
in the process of identifying a successor to Mr. Pignatelli. The
Company expects to announce a successor very soon.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to
be signed on its behalf by the undersigned thereunto duly authorized.
Date: December 10, 2008
UNISOURCE ENERGY CORPORATION
(Registrant)
/s/  Kevin P. Larson
Senior Vice President and Chief Financial Officer
Date: December 10, 2008
TUCSON ELECTRIC POWER COMPANY
(Registrant)
/s/  Kevin P. Larson
Senior Vice President and Chief Financial Officer