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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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  <p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">SECURITIES
  AND EXCHANGE COMMISSION</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington,
  D.C. 20549</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="5" face="Times New Roman" style="font-size:18.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Pursuant to Section&nbsp;13 or 15(d)&nbsp;of<br>
  the Securities Exchange Act of 1934</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of Report
  (Date of earliest event reported) <b>June&nbsp;12,
  2008</b></font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">Southwestern
  Public Service Company</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of
  registrant as specified in its charter)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">New
  Mexico</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other
  jurisdiction of incorporation)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div align="center">
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
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    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">001-03789</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">75-0575400</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission File
    Number)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(IRS Employer
    Identification No.)</font></p>
    </td>
   </tr>
   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Tyler
    at Sixth, Amarillo, Texas</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">79101</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of
    principal executive offices)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Zip Code)</font></p>
    </td>
   </tr>
  </table>
  
  </div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registrant&#146;s
  telephone number, including area code<b> 303-571-7511</b></font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Former name or
  former address, if changed since last report)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box
  below if the Form&nbsp;8-K filing is intended to simultaneously satisfy the
  filing obligation of the registrant under any of the following provisions (see
  General Instruction A.2. below):</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Written communications pursuant to Rule&nbsp;425
  under the Securities Act (17 CFR 230.425)</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Soliciting material pursuant to Rule&nbsp;14a-12
  under the Exchange Act (17 CFR 240.14a-12)</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Pre-commencement communications pursuant
  to Rule&nbsp;14d-2(b)&nbsp;under the Exchange Act (17 CFR 240.14d-2(b))</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Pre-commencement communications pursuant
  to Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act (17 CFR 240.13e-4(c))</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0in 0in 0in 0in;">
  
  <p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  </div>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='',FILE='C:\JMS\eudelhofen\08-16695-1\task2987229\16695-1-ba.htm',USER='eudelho',CD='Jun 13 16:00 2008' -->
  
  
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  <div>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item 8.01. Other Events</font></u></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On June&nbsp;12, 2008,
  Southwestern Public Service Company (SPS) filed with the Public Utility
  Commission of Texas (PUCT), and the 80 cities in SPS&#146; Texas service territory
  with original rate jurisdiction, a request for a Texas system retail electric
  general rate increase.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The filing requests an
  overall increase in annual revenues of approximately $61.3 million, or an
  increase of 5.9 percent.&nbsp; Base revenues are proposed to increase by $94.4
  million, while fuel and purchased power revenue will decline by $33.1 million,
  primarily due to the fuel savings from Lea Power Partners, LLC (LLP).&#160; The LPP generating facility is located
  outside of Hobbs, New Mexico.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The rate filing is based
  on a 2007 calendar year base period adjusted for known and measurable changes
  and includes a requested rate of return on equity of 11.25 percent, an electric
  net rate base of approximately $989.4 million allocated to the Texas retail
  jurisdiction, and an equity ratio of 51.0 percent.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">In SPS&#146; last Texas rate
  case, the parties agreed that SPS seek, in this rate filing, interim rate
  relief of $18 million per year for the LPP power purchase agreement.&#160; The interim rates are proposed to go into
  effect when the LPP power plant comes on line in 2008.&#160; The jurisdictional deadline for the PUCT to
  act on SPS&#146; request is Dec.&nbsp;14, 2008.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The filing with the PUCT
  also includes a request to reconcile SPS&#146; fuel and purchased power costs for
  calendar years 2006 and 2007.&#160; As of Dec.&nbsp;31,
  2007, SPS had a fuel cost under-recovery balance of approximately $50.6
  million.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:-.1pt;">The matters discussed herein,
  including the expected the amount of electric rate increase for 2008, are
  forward-looking statements that are subject to certain risks, uncertainties and
  assumptions. Such forward-looking statements are intended to be identified in
  this document by the words &#147;anticipate,&#148; &#147;believe,&#148; &#147;estimate,&#148; &#147;expect,&#148; &#147;intend,&#148;
  &#147;may,&#148; &#147;objective,&#148; &#147;outlook,&#148; &#147;plan,&#148; &#147;project,&#148; &#147;possible,&#148; &#147;potential,&#148; &#147;should&#148;
  and similar expressions. Actual results may vary materially. Forward-looking
  statements speak only as of the date they are made, and we do not undertake any
  obligation to update them to reflect changes that occur after that date.
  Factors that could cause actual results to differ materially include, but are
  not limited to: general economic conditions, including the availability of
  credit and its impact on capital expenditures and the ability of SPS to obtain
  financing on favorable terms; business conditions in the energy industry;
  actions of credit rating agencies; competitive factors, including the extent
  and timing of the entry of additional competition in the markets served by SPS;
  unusual weather; effects of geopolitical events, including war and acts of
  terrorism; state, federal and foreign legislative and regulatory initiatives
  that affect cost and investment recovery, have an impact on rates or have an
  impact on asset operation or ownership; structures that affect the speed and
  degree to which competition enters the electric and natural gas markets; costs
  and other effects of legal and administrative proceedings, settlements,
  investigations and claims; actions of accounting regulatory bodies; and the
  other risk factors listed from time to time by SPS in reports filed with the
  Securities and Exchange Commission (SEC), including Risk Factors in Item 1A and
  Exhibit&nbsp;99.01 of SPS&#146; Annual Report on Form&nbsp;10-K for the year ended Dec.&nbsp;31,
  2007 and SPS&#146; Quarterly Report on Form&nbsp;10-Q for the quarter ended March&nbsp;31,
  2008.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>
  
  <div style="margin:0in 0in .0001pt;text-indent:0in;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='2',FILE='C:\JMS\eudelhofen\08-16695-1\task2987229\16695-1-ba.htm',USER='eudelho',CD='Jun 13 16:00 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>
  
  <p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">SIGNATURES</font></b></p>
  
  <p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the
  requirements of the Securities Exchange Act of 1934, the registrant has duly
  caused this report to be signed on its behalf by the undersigned hereunto duly
  authorized.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="49%" colspan="2" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Southwestern Public
    Service Company<br>
    (a New Mexico Corporation)</font></p>
    </td>
   </tr>
   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="49%" colspan="2" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="36%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:36.74%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ BENJAMIN G.S. FOWKE
    III</font></p>
    </td>
    <td width="12%" valign="top" style="padding:0in .7pt 0in .7pt;width:12.26%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="49%" colspan="2" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Benjamin G.S. Fowke III</font></p>
    </td>
   </tr>
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    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
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    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
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    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Vice President and
    Chief Financial Officer</font></p>
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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">June&nbsp;13, 2008</font></p>
  
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>
  
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metadata_documents: [{"type": "8-K", "sequence": "1", "filename": "a08-16695_18k.htm", "description": "8-K", "secsgml_size_bytes": 22964}]
metadata_filer: {"company-data": {"conformed-name": "SOUTHWESTERN PUBLIC SERVICE CO", "cik": "0000092521", "assigned-sic": "4931", "irs-number": "750575400", "state-of-incorporation": "NM", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-03789", "film-number": "08898849"}, "business-address": {"street1": "SPS TOWER", "street2": "TYLER AT SIXTH ST", "city": "AMARILLO", "state": "TX", "zip": "79101", "phone": "3035717511"}, "mail-address": {"street1": "PO BOX 1261", "city": "AMARILLO", "state": "TX", "zip": "79170"}}
text: 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)
  June 12,
  2008
  Southwestern
  Public Service Company
  (Exact name of
  registrant as specified in its charter)
  New
  Mexico
  (State or other
  jurisdiction of incorporation)
  001-03789
  75-0575400
  (Commission File
    Number)
  (IRS Employer
    Identification No.)
  Tyler
    at Sixth, Amarillo, Texas
  79101
  (Address of
    principal executive offices)
  (Zip Code)
  Registrant's
  telephone number, including area code
  303-571-7511
  (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 (see
  General Instruction A.2. below):
  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 June 12, 2008,
  Southwestern Public Service Company (SPS) filed with the Public Utility
  Commission of Texas (PUCT), and the 80 cities in SPS' Texas service territory
  with original rate jurisdiction, a request for a Texas system retail electric
  general rate increase.
  The filing requests an
  overall increase in annual revenues of approximately $61.3 million, or an
  increase of 5.9 percent.  Base revenues are proposed to increase by $94.4
  million, while fuel and purchased power revenue will decline by $33.1 million,
  primarily due to the fuel savings from Lea Power Partners, LLC (LLP).  The LPP generating facility is located
  outside of Hobbs, New Mexico.
  The rate filing is based
  on a 2007 calendar year base period adjusted for known and measurable changes
  and includes a requested rate of return on equity of 11.25 percent, an electric
  net rate base of approximately $989.4 million allocated to the Texas retail
  jurisdiction, and an equity ratio of 51.0 percent.
  In SPS' last Texas rate
  case, the parties agreed that SPS seek, in this rate filing, interim rate
  relief of $18 million per year for the LPP power purchase agreement.  The interim rates are proposed to go into
  effect when the LPP power plant comes on line in 2008.  The jurisdictional deadline for the PUCT to
  act on SPS' request is Dec. 14, 2008.
  The filing with the PUCT
  also includes a request to reconcile SPS' fuel and purchased power costs for
  calendar years 2006 and 2007.  As of Dec. 31,
  2007, SPS had a fuel cost under-recovery balance of approximately $50.6
  million.
  The matters discussed herein,
  including the expected the amount of electric rate increase for 2008, are
  forward-looking statements that are subject to certain risks, uncertainties and
  assumptions. Such forward-looking statements are intended to be identified in
  this document by the words "anticipate," "believe," "estimate," "expect," "intend,"
  "may," "objective," "outlook," "plan," "project," "possible," "potential," "should"
  and similar expressions. Actual results may vary materially. Forward-looking
  statements speak only as of the date they are made, and we do not undertake any
  obligation to update them to reflect changes that occur after that date.
  Factors that could cause actual results to differ materially include, but are
  not limited to: general economic conditions, including the availability of
  credit and its impact on capital expenditures and the ability of SPS to obtain
  financing on favorable terms; business conditions in the energy industry;
  actions of credit rating agencies; competitive factors, including the extent
  and timing of the entry of additional competition in the markets served by SPS;
  unusual weather; effects of geopolitical events, including war and acts of
  terrorism; state, federal and foreign legislative and regulatory initiatives
  that affect cost and investment recovery, have an impact on rates or have an
  impact on asset operation or ownership; structures that affect the speed and
  degree to which competition enters the electric and natural gas markets; costs
  and other effects of legal and administrative proceedings, settlements,
  investigations and claims; actions of accounting regulatory bodies; and the
  other risk factors listed from time to time by SPS in reports filed with the
  Securities and Exchange Commission (SEC), including Risk Factors in Item 1A and
  Exhibit 99.01 of SPS' Annual Report on Form 10-K for the year ended Dec. 31,
  2007 and SPS' Quarterly Report on Form 10-Q for the quarter ended March 31,
  2008.
  2
  SIGNATURES
  Pursuant to the
  requirements of the Securities Exchange Act of 1934, the registrant has duly
  caused this report to be signed on its behalf by the undersigned hereunto duly
  authorized.
  Southwestern Public
    Service Company
  (a New Mexico Corporation)
  /s/ BENJAMIN G.S. FOWKE
    III
  Benjamin G.S. Fowke III
  Vice President and
    Chief Financial Officer
  June 13, 2008
  3