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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): March 26, 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 align="center" style="font-size: 10pt; display: none">1
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<DIV align="left" style="font-size: 10pt; margin-top: 10pt"><B><U>Item&nbsp;8.01 &#151; Other Events.</U></B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">On March&nbsp;26, 2009 (the &#147;Closing Date&#148;), UniSource Energy Development Company (&#147;UED&#148;), a
subsidiary of UniSource Energy Corporation (&#147;UniSource Energy&#148;) entered into a 364-day credit
agreement with Union Bank, N.A., as administrative agent and lead arranger (&#147;Union Bank&#148;), and the
lenders from time to time party thereto (the &#147;UED Credit Agreement&#148;), pursuant to which the lenders
made available a $30&nbsp;million term loan facility which was drawn, in full, on the Closing Date.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">The proceeds of the borrowing were used to make a distribution to UniSource Energy, which in
turn made a $30&nbsp;million capital contribution to Tucson Electric Power Company (&#147;TEP&#148;). On March
30, 2009, this capital contribution was used by TEP to purchase lease debt previously issued by
Wilmington Trust Company, as Owner Trustee under the Springerville Unit 1 lease to which TEP is a
party. The notes purchased have a stated interest rate of 10.73% and have a final maturity date of
January&nbsp;1, 2013. It is anticipated that the $30.6&nbsp;million purchase price for these notes will be
recorded as a long-term investment on TEP and UniSource Energy&#146;s balance sheets.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">The obligations of UED under the UED Credit Agreement are secured, subject to certain
exceptions, by substantially all assets of UED, which primarily consists of the Black Mountain
Generating Station (&#147;BMGS&#148;) in Mohave County, Arizona and a mortgage on UED&#146;s leasehold interest in
the real property on which BMGS is located. The obligations of UED under the UED Credit Agreement
are unconditionally guaranteed by UniSource Energy pursuant to a guaranty agreement which contains
the same representations, warranties and covenants as those contained in the Amended and Restated
Credit Agreement, dated as of August&nbsp;11, 2006<U>,</U> among UniSource Energy, as borrower, Union
Bank, as administrative agent and lead arranger, and the lenders from time to time party thereto
(the &#147;UniSource Credit Agreement&#148;). For a summary of the material terms of the UniSource Credit
Agreement, see UniSource Energy&#146;s Current Report on Form 8-K dated August&nbsp;15, 2006, to which the
UniSource Credit Agreement is filed as Exhibit&nbsp;4.1.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">The UED Credit Agreement will expire on March&nbsp;24, 2010, at which time all outstanding amounts
thereunder will be due and payable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt"><B><U>Item&nbsp;9.01. Financial Statements and Exhibits </U></B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 10pt"><B>(d)&nbsp;Exhibits</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 10pt">4(a) UniSource Energy Development Credit Agreement, dated as of March&nbsp;26, 2009, between UED and
Union Bank, N.A. and the banks named herein and from time to time
parties thereto.<BR>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt">4(b)
Guaranty Agreement, dated as of March&nbsp;26, 2009, made by UniSource Energy in favor of Union Bank, N.A. as Agent for each of the
secured parties as defined in the UED Credit Agreement.
</DIV>


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

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





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


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

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="45%">&nbsp;</TD>
    <TD width="10%">&nbsp;</TD>
    <TD width="45%">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>UNISOURCE ENERGY CORPORATION</B></TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">
    <TD nowrap align="left">Date: April 1, 2009</TD>
    <TD>&nbsp;</TD>
    <TD align="center">(Registrant)</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">/s/&nbsp;&nbsp;&nbsp;Kevin P. Larson</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Senior Vice President and Principal Financial Officer</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"></TD>
</TR>
<TR valign="bottom">

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Date:
April 1, 2009
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>TUCSON ELECTRIC POWER COMPANY</B></TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(Registrant)</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">/s/&nbsp;&nbsp;&nbsp;Kevin P. Larson</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Senior Vice President and Principal Financial Officer</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


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

<P align="center" style="font-size: 10pt; display: none">3




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<DIV style="font-family: Arial,sans-serif; margin-left: .25in; width: 7.20in">

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





<DIV align="left" style="font-size: 10pt; margin-top: 10pt">4(a) UniSource Energy Development Credit Agreement, dated as of March&nbsp;26, 2009, between UED and
Union Bank, N.A. and the banks named herein and from time to time
parties thereto.<BR>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 10pt">4(b)
Guaranty Agreement, dated as of March&nbsp;26, 2009, made by
UniSource Energy in favor of Union Bank, N.A. as Agent for each of
the secured parties as defined in the UED Credit Agreement.
</DIV>







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

<P align="center" style="font-size: 10pt; display: none">4




</DIV>
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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): March 26, 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 8.01 — Other Events.
On March 26, 2009 (the "Closing Date"), UniSource Energy Development Company ("UED"), a
subsidiary of UniSource Energy Corporation ("UniSource Energy") entered into a 364-day credit
agreement with Union Bank, N.A., as administrative agent and lead arranger ("Union Bank"), and the
lenders from time to time party thereto (the "UED Credit Agreement"), pursuant to which the lenders
made available a $30 million term loan facility which was drawn, in full, on the Closing Date.
The proceeds of the borrowing were used to make a distribution to UniSource Energy, which in
turn made a $30 million capital contribution to Tucson Electric Power Company ("TEP"). On March
30, 2009, this capital contribution was used by TEP to purchase lease debt previously issued by
Wilmington Trust Company, as Owner Trustee under the Springerville Unit 1 lease to which TEP is a
party. The notes purchased have a stated interest rate of 10.73% and have a final maturity date of
January 1, 2013. It is anticipated that the $30.6 million purchase price for these notes will be
recorded as a long-term investment on TEP and UniSource Energy's balance sheets.
The obligations of UED under the UED Credit Agreement are secured, subject to certain
exceptions, by substantially all assets of UED, which primarily consists of the Black Mountain
Generating Station ("BMGS") in Mohave County, Arizona and a mortgage on UED's leasehold interest in
the real property on which BMGS is located. The obligations of UED under the UED Credit Agreement
are unconditionally guaranteed by UniSource Energy pursuant to a guaranty agreement which contains
the same representations, warranties and covenants as those contained in the Amended and Restated
Credit Agreement, dated as of August 11, 2006
,
among UniSource Energy, as borrower, Union
Bank, as administrative agent and lead arranger, and the lenders from time to time party thereto
(the "UniSource Credit Agreement"). For a summary of the material terms of the UniSource Credit
Agreement, see UniSource Energy's Current Report on Form 8-K dated August 15, 2006, to which the
UniSource Credit Agreement is filed as Exhibit 4.1.
The UED Credit Agreement will expire on March 24, 2010, at which time all outstanding amounts
thereunder will be due and payable.
Item 9.01. Financial Statements and Exhibits
(d) Exhibits
4(a) UniSource Energy Development Credit Agreement, dated as of March 26, 2009, between UED and
Union Bank, N.A. and the banks named herein and from time to time
parties thereto.
4(b)
Guaranty Agreement, dated as of March 26, 2009, made by UniSource Energy in favor of Union Bank, N.A. as Agent for each of the
secured parties as defined in the UED Credit Agreement.
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.
UNISOURCE ENERGY CORPORATION
Date: April 1, 2009
(Registrant)
/s/   Kevin P. Larson
Senior Vice President and Principal Financial Officer
Date:
April 1, 2009
TUCSON ELECTRIC POWER COMPANY
(Registrant)
/s/   Kevin P. Larson
Senior Vice President and Principal Financial Officer
EXHIBIT INDEX
4(a) UniSource Energy Development Credit Agreement, dated as of March 26, 2009, between UED and
Union Bank, N.A. and the banks named herein and from time to time
parties thereto.
4(b)
Guaranty Agreement, dated as of March 26, 2009, made by
UniSource Energy in favor of Union Bank, N.A. as Agent for each of
the secured parties as defined in the UED Credit Agreement.