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<TITLE>Form 8-K</TITLE>
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<P align="center" style="font-size: 14pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION<BR>
<FONT style="font-size: 12pt">Washington, D.C. 20549
</FONT></B>

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

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

<P align="center" style="font-size: 10pt"><B>Date of Report (Date of earliest event reported): May 4, 2009</B>





<P align="center">

<P align="center" style="font-size: 24pt"><B>UNISOURCE ENERGY CORPORATION</B><BR>
<FONT style="font-size: 10pt">(Exact name of registrant as specified in its charter)
</FONT>

<TABLE border="0" width="100%" cellspacing="0" cellpadding="0" style="font-size: 10pt; text-align: center">
<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: 1px solid #000000"><B>(An Arizona Corporation)</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><B>1-13739</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><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 border="0" width="100%" cellspacing="0" cellpadding="0" style="font-size: 10pt; text-align: center">
<TR>
    <TD width="49%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="49%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD style="border-bottom: 1px solid #000000"><B>One South Church Avenue, Suite 100<BR>Tucson, AZ</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><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 align="center" style="font-size: 10pt">Registrant&#146;s telephone number, including area code: <B>(520) 571-4000</B>


<TABLE border="0" width="30%" cellspacing="0" cellpadding="0" style="font-size: 10pt; text-align: center">
<TR>
    <TD width="100%">&nbsp;</TD>
</TR>
<TR>
    <TD nowrap style="border-bottom: 1px solid #000000"><B>&nbsp;</B></TD>
</TR>
<TR>
    <TD nowrap>(Former name or former address if changed since last report.)</TD>
</TR>
</TABLE>







<P align="center">

<P align="center" style="font-size: 24pt"><B>TUCSON ELECTRIC POWER COMPANY</B><BR>
<FONT style="font-size: 10pt">(Exact name of registrant as specified in its charter)
</FONT>

<TABLE border="0" width="100%" cellspacing="0" cellpadding="0" style="font-size: 10pt; text-align: center">
<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: 1px solid #000000"><B>(An Arizona Corporation)</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><B>1-5924  </B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><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 border="0" width="100%" cellspacing="0" cellpadding="0" style="font-size: 10pt; text-align: center">
<TR>
    <TD width="49%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="49%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD style="border-bottom: 1px solid #000000"><B>One South Church Avenue, Suite 100<BR>Tucson, AZ</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-bottom: 1px solid #000000"><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 align="center" style="font-size: 10pt">Registrant&#146;s telephone number, including area code: <B>(520) 571-4000</B>


<TABLE border="0" width="30%" cellspacing="0" cellpadding="0" style="font-size: 10pt; text-align: center">
<TR>
    <TD width="100%">&nbsp;</TD>
</TR>
<TR>
    <TD nowrap style="border-bottom: 1px solid #000000"><B>&nbsp;</B></TD>
</TR>
<TR>
    <TD nowrap>(Former name or former address if changed since last report.)</TD>
</TR>
</TABLE>





<P align="left" style="font-size: 10pt">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 align="left" style="font-size: 10pt">
<FONT face="Wingdings">&#111;</FONT> Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)<BR><BR>
<FONT face="Wingdings">&#111;</FONT> Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)<BR><BR>
<FONT face="Wingdings">&#111;</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">&#111;</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="justify"><BR>
<U><B>Item</B></U> <U><B>2.02
Results of Operations and Financial Condition</B></U> &nbsp;

<P style="font-size: 10pt; text-indent: 3%" align="justify">On May&nbsp;4,
2009, UniSource Energy Corporation (&#8220;UniSource Energy&#8221;) issued a
press release announcing earnings for the quarter ended March&nbsp;31, 2009 for
UniSource Energy and Tucson Electric Power Company.&nbsp;&nbsp;A copy of the
press release is attached hereto as Exhibit&nbsp;99.1. UniSource Energy also
posted supplemental information accessible from a link on its website,
<U>www.uns.com</U>. A copy of the supplemental information is attached hereto
as Exhibit&nbsp;99.2.

<P style="font-size: 10pt; text-indent: 3%" align="justify">The Company&#8217;s
press releases and other communications may include certain non-Generally
Accepted Accounting Principles (GAAP)&nbsp;financial measures. A
&#8220;non-GAAP financial measure&#8221; is defined as a numerical measure of a
company&#8217;s financial performance, financial position or cash flows that
excludes (or includes) amounts that are included in (or excluded from) the most
directly comparable measure calculated and presented in accordance with GAAP in
the Company&#8217;s financial statements.

<P style="font-size: 10pt; text-indent: 3%" align="justify">Non-GAAP financial
measures utilized by the Company include presentations of revenues, operating
expenses, operating income and earnings (loss)&nbsp;per share. The Company uses
these non-GAAP measures to evaluate the operations of the Company. Certain
non-GAAP financial measures utilized by the Company exclude: the impact of
non-recurring items: the effect of accounting changes or adjustments; expenses
that are reimbursed by third parties; and other items. The Company&#8217;s
management believes that these non-GAAP financial measures provide useful
information to investors by removing the effect of variances in GAAP reported
results of operations that are not indicative of fundamental changes in the
earnings or cash flow capacity of the Company&#8217;s operations. Management
also believes that the presentation of the non-GAAP financial measures is
largely consistent with its past practice, as well as industry practice in
general, and will enable investors and analysts to compare current non-GAAP
measures with non-GAAP measures with respect to prior periods.

<P style="font-size: 10pt" align="justify"><BR>
<U><B>Item&nbsp;9.01 Financial
Statements and Exhibits</B></U> <BR>
&nbsp;

<P style="font-size: 10pt; text-indent: 4%"
align="justify">Exhibit&nbsp;99.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; UniSource
Energy Corporation Press Release, dated May&nbsp;4, 2009.

<P>
<TABLE style="font-size: 10pt" cellspacing="0" cellpadding="0" width="100%"
border="0">

 <TR
style="font-size: 10pt; background: none transparent scroll repeat 0% 0%; color: #000000"
valign="top">
  <TD width="4%">&nbsp;</TD>
  <TD nowrap align="left" width="10%">Exhibit&nbsp;99.2&nbsp;</TD>
  <TD width="4%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">Supplemental
earnings and outlook information posted on UniSource Energy&#8217;s website,
dated May 4, 2009.</DIV>
</TD>
 </TR>

</TABLE>&nbsp;


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

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

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<DIV
style="margin-left: 0.25in; width: 7.2in; font-family: Arial,sans-serif">&nbsp;

<DIV align="center" style="font-size: 10pt; margin-top: 10pt"><B>SIGNATURES</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">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">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">Date: May 4, 2009          &nbsp;</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">Senior Vice President and Principal&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Financial Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">Date: May 4, 2009      &nbsp;</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">Senior Vice President and Principal&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Financial Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>

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

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<P style="font-size: 10pt" align="center"><B>EXHIBT INDEX</B>

<P style="font-size: 10pt; text-indent: 3%" align="justify">

<P>
<TABLE style="font-size: 10pt" cellspacing="0" cellpadding="0" width="100%"
border="0">

 <TR
style="font-size: 10pt; background: none transparent scroll repeat 0% 0%; color: #000000"
valign="top">
  <TD width="4%">&nbsp;</TD>
  <TD nowrap align="left" width="10%" style="border-bottom: 1px solid #000000"><B>Exhibit<BR>No.</B></TD>
  <TD width="4%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify; border-bottom: 1px solid #000000"><BR><B>Description</B></DIV>
</TD>
 </TR>

</TABLE>


<P style="font-size: 10pt; text-indent: 4%"
align="justify">Exhibit&nbsp;99.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; UniSource
Energy Corporation Press Release, dated May&nbsp;4, 2009.

<P>
<TABLE style="font-size: 10pt" cellspacing="0" cellpadding="0" width="100%"
border="0">

 <TR
style="font-size: 10pt; background: none transparent scroll repeat 0% 0%; color: #000000"
valign="top">
  <TD width="4%">&nbsp;</TD>
  <TD nowrap align="left" width="10%">Exhibit&nbsp;99.2&nbsp;</TD>
  <TD width="4%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">Supplemental
earnings and outlook information posted on UniSource Energy&#8217;s website,
dated May 4, 2009.</DIV>
</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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Form 8-K
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): May 4, 2009
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
2.02
Results of Operations and Financial Condition
On May 4,
2009, UniSource Energy Corporation ("UniSource Energy") issued a
press release announcing earnings for the quarter ended March 31, 2009 for
UniSource Energy and Tucson Electric Power Company.  A copy of the
press release is attached hereto as Exhibit 99.1. UniSource Energy also
posted supplemental information accessible from a link on its website,
www.uns.com
. A copy of the supplemental information is attached hereto
as Exhibit 99.2.
The Company's
press releases and other communications may include certain non-Generally
Accepted Accounting Principles (GAAP) financial measures. A
"non-GAAP financial measure" is defined as a numerical measure of a
company's financial performance, financial position or cash flows that
excludes (or includes) amounts that are included in (or excluded from) the most
directly comparable measure calculated and presented in accordance with GAAP in
the Company's financial statements.
Non-GAAP financial
measures utilized by the Company include presentations of revenues, operating
expenses, operating income and earnings (loss) per share. The Company uses
these non-GAAP measures to evaluate the operations of the Company. Certain
non-GAAP financial measures utilized by the Company exclude: the impact of
non-recurring items: the effect of accounting changes or adjustments; expenses
that are reimbursed by third parties; and other items. The Company's
management believes that these non-GAAP financial measures provide useful
information to investors by removing the effect of variances in GAAP reported
results of operations that are not indicative of fundamental changes in the
earnings or cash flow capacity of the Company's operations. Management
also believes that the presentation of the non-GAAP financial measures is
largely consistent with its past practice, as well as industry practice in
general, and will enable investors and analysts to compare current non-GAAP
measures with non-GAAP measures with respect to prior periods.
Item 9.01 Financial
Statements and Exhibits
Exhibit 99.1       UniSource
Energy Corporation Press Release, dated May 4, 2009.
Exhibit 99.2
Supplemental
earnings and outlook information posted on UniSource Energy's website,
dated May 4, 2009.
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: May 4, 2009
UNISOURCE ENERGY CORPORATION
(Registrant)
/s/   Kevin P. Larson
Senior Vice President and Principal
Financial Officer
Date: May 4, 2009
TUCSON ELECTRIC POWER COMPANY
(Registrant)
/s/   Kevin P. Larson
Senior Vice President and Principal
Financial Officer
EXHIBT INDEX
Exhibit
No.
Description
Exhibit 99.1       UniSource
Energy Corporation Press Release, dated May 4, 2009.
Exhibit 99.2
Supplemental
earnings and outlook information posted on UniSource Energy's website,
dated May 4, 2009.