﻿<?xml version="1.0" encoding="utf-8"?>
<InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.2.0.7</Version>
  <hasSegments>false</hasSegments>
  <ReportName>Capitalization</ReportName>
  <ReportLongName>10701 - Disclosure - Capitalization</ReportLongName>
  <DisplayLabelColumn>true</DisplayLabelColumn>
  <ShowElementNames>false</ShowElementNames>
  <RoundingOption />
  <HasEmbeddedReports>false</HasEmbeddedReports>
  <Columns>
    <Column>
      <LabelColumn>false</LabelColumn>
      <Id>1</Id>
      <Labels>
        <Label Id="1" Label="9 Months Ended" />
        <Label Id="2" Label="Sep. 30, 2010" />
      </Labels>
      <CurrencyCode>USD</CurrencyCode>
      <FootnoteIndexer />
      <hasSegments>false</hasSegments>
      <hasScenarios>false</hasScenarios>
      <Segments />
      <Scenarios />
      <Units>
        <Unit>
          <UnitID>Unit12</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
            <MeasureValue>USD</MeasureValue>
            <MeasureNamespace>iso4217</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>Unit13</UnitID>
          <UnitType>Divide</UnitType>
          <NumeratorMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
            <MeasureValue>USD</MeasureValue>
            <MeasureNamespace>iso4217</MeasureNamespace>
          </NumeratorMeasure>
          <DenominatorMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </DenominatorMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>Unit1</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
      </Units>
      <CurrencySymbol>$</CurrencySymbol>
    </Column>
  </Columns>
  <Rows>
    <Row>
      <Id>2</Id>
      <Label>Capitalization</Label>
      <Level>0</Level>
      <ElementName>pnm_Capitalization</ElementName>
      <ElementPrefix>pnm</ElementPrefix>
      <IsBaseElement>false</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>duration</PeriodType>
      <ShortDefinition>Capitalization</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
      <IsAbstractGroupTitle>true</IsAbstractGroupTitle>
      <IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow>
      <IsEquityAdjustmentRow>false</IsEquityAdjustmentRow>
      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsReverseSign>false</IsReverseSign>
      <PreferredLabelRole />
      <IsEPS>false</IsEPS>
      <FootnoteIndexer />
      <Cells>
        <Cell>
          <Id>1</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0</NumericAmount>
          <RoundedNumericAmount>0</RoundedNumericAmount>
          <NonNumbericText />
          <NonNumericTextHeader />
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
        </Cell>
      </Cells>
      <OriginalInstanceReportColumns />
      <ElementDataType>xbrli:stringItemType</ElementDataType>
      <SimpleDataType>string</SimpleDataType>
      <ElementDefenition>Capitalization</ElementDefenition>
      <IsTotalLabel>false</IsTotalLabel>
    </Row>
    <Row>
      <Id>3</Id>
      <Label>Capitalization</Label>
      <Level>1</Level>
      <ElementName>us-gaap_ScheduleOfCapitalizationTextBlock</ElementName>
      <ElementPrefix>us-gaap</ElementPrefix>
      <IsBaseElement>true</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>duration</PeriodType>
      <ShortDefinition>No definition available.</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
      <IsAbstractGroupTitle>false</IsAbstractGroupTitle>
      <IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow>
      <IsEquityAdjustmentRow>false</IsEquityAdjustmentRow>
      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsReverseSign>false</IsReverseSign>
      <PreferredLabelRole>terselabel</PreferredLabelRole>
      <IsEPS>false</IsEPS>
      <FootnoteIndexer />
      <Cells>
        <Cell>
          <Id>1</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0</NumericAmount>
          <RoundedNumericAmount>0</RoundedNumericAmount>
          <NonNumbericText>&lt;div&gt;
&lt;div&gt;
&lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt;
&lt;tr&gt;&lt;td valign="top" width="4%" align="left"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;(7)&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" align="left"&gt;
&lt;p align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;Capitalization &lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
&lt;p style="margin-top: 6px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;Information concerning financing activities is contained in Note 6 of Notes to Consolidated Financial Statements in the 2009 Annual Reports on Form 10-K. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 18px; margin-bottom: 0px;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;Short-term Debt &lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 6px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;At December&amp;nbsp;31, 2009, PNMR and PNM had revolving credit facilities for borrowings up to $600.0 million under the PNMR Facility and $400.0 million under the PNM Facility that primarily expire in 2012. LBB was a lender under the PNMR Facility and the PNM Facility. LBH, the parent of LBB, filed for bankruptcy protection. Subsequent to the bankruptcy filing by LBH, LBB declined to fund a borrowing request under the PNMR Facility. A replacement bank has taken the place of LBB under the PNM Facility. In March 2010, the PNMR Facility was amended to remove LBB as a lender and reduce the total capacity under the PNMR Facility to $568.0 million. In addition to the reduction in the PNMR Facility related to LBB, the PNMR Facility and the PNM Facility were reduced by $26.0 million and $14.0 million in August 2010 and will reduce by an additional $25.0 million and $18.0 million in August 2011 according to their terms. In addition, PNMR has a local line of credit amounting to $5.0 million that expires in August 2011 and PNM had a local line of credit for $5.0 million that was allowed to expire in August 2010. TNMP has a revolving credit facility for borrowings up to $75.0 million under the TNMP Revolving Credit Facility that expires in April 2011. At September&amp;nbsp;30, 2010, the weighted average interest rate for borrowings was 1.51% for the PNMR Facility and 0.91% for the PNM Facility. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 12px; margin-bottom: 0px; font-size: 1px;"&gt;&amp;nbsp;&lt;/p&gt;
&lt;p style="margin-top: 0px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;Short-term debt outstanding consists of: &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 0px; margin-bottom: 0px; font-size: 12px;"&gt;&amp;nbsp;&lt;/p&gt;
&lt;table border="0" cellspacing="0" cellpadding="0" width="73%" align="center"&gt;
&lt;tr&gt;&lt;td width="88%"&gt; &lt;/td&gt;
&lt;td valign="bottom" width="5%"&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td valign="bottom" width="5%"&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;
&lt;td&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" nowrap="nowrap" align="center"&gt;
&lt;p style="margin-top: 0px; margin-bottom: 1px;" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;Short-term Debt&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;&amp;nbsp;&amp;nbsp;September&amp;nbsp;30,&amp;nbsp;&amp;nbsp;&lt;br /&gt;2010&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;&amp;nbsp;&amp;nbsp;December&amp;nbsp;31,&amp;nbsp;&amp;nbsp;&lt;br /&gt;2009&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" colspan="6" align="center"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;(In thousands)&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;
&lt;p style="text-indent: -1em; margin-left: 1em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;PNM&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="top"&gt;
&lt;p style="text-indent: -1em; margin-left: 2em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;Revolving credit facility&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&amp;nbsp;&amp;nbsp;173,000&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&amp;nbsp;&amp;nbsp;118,000&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;
&lt;p style="text-indent: -1em; margin-left: 2em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;Local lines of credit&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;*&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;-&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="top"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;173,000&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;118,000&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;
&lt;p style="text-indent: -1em; margin-left: 1em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;TNMP &amp;ndash; Revolving credit facility&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;-&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;-&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="top"&gt;
&lt;p style="text-indent: -1em; margin-left: 1em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;PNMR&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;
&lt;p style="text-indent: -1em; margin-left: 2em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;Revolving credit facility&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;19,000&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;80,000&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td valign="top"&gt;
&lt;p style="text-indent: -1em; margin-left: 2em;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;Local lines of credit&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;-&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;-&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td height="8"&gt; &lt;/td&gt;
&lt;td height="8" colspan="4"&gt; &lt;/td&gt;
&lt;td height="8" colspan="4"&gt; &lt;/td&gt;&lt;/tr&gt;
&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&amp;nbsp;&amp;nbsp;192,000&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font class="_mt" size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;$&amp;nbsp;&amp;nbsp;198,000&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td valign="bottom"&gt; &lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
&lt;p style="margin-top: 6px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;* This line of credit was allowed to expire in August 2010. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 12px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;At October&amp;nbsp;25, 2010, PNMR, PNM, and TNMP had $464.1 million, $167.3 million, and $74.7 million of availability under their respective revolving credit facilities and local lines of credit, including reductions of availability due to outstanding letters of credit. Total availability at October&amp;nbsp;25, 2010, on a consolidated basis, was $706.1 million for PNMR. At October&amp;nbsp;25, 2010, PNMR and PNM had invested cash of $3.3 million and $12.3 million. TNMP had no such investments. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 12px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;As of September&amp;nbsp;30, 2010 and December&amp;nbsp;31, 2009, TNMP had outstanding borrowings of $3.7 million and $23.5 million from PNMR under its intercompany loan agreement. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 18px; margin-bottom: 0px;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;Financing Activities &lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 6px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;In March 2009, TNMP entered into and borrowed $50.0 million under a loan agreement with Union Bank, N. A. (the "2009 Term Loan Agreement").&amp;nbsp;Through hedging arrangements, TNMP established fixed interest rates for the 2009 Term Loan Agreement of 6.05% for the first three years and 6.30% thereafter. In January 2010, the relationship was modified to reduce the fixed interest rate to 4.80% through March&amp;nbsp;31, 2012 and to 5.05% thereafter. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 12px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;In January 2010, PNM entered into a floating-to-fixed interest rate swap with a notional amount of $100.0 million. The effect of this swap is to convert $100.0 million of borrowings under the PNM Facility from an interest rate based on the one-month LIBOR rate to a fixed rate of 1.245% through January&amp;nbsp;14, 2011, which rate is subject to adjustment in the event PNM's credit ratings are changed. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 12px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;These interest rate swap arrangements are accounted for as cash flow hedges and the September&amp;nbsp;30, 2010 pre-tax fair value losses of $2.6 million for the TNMP hedge and $0.1 million for the PNM hedge are included in AOCI and in other current liabilities, except for $1.6 million included in other deferred credits for TNMP, on the Condensed Consolidated Balance Sheets. Amounts reclassified from AOCI are included in interest charges. The fair value determinations were made using Level 2 inputs under GAAP and were determined using forward&amp;nbsp;LIBOR curves under the mid-market convention&amp;nbsp;to discount cash flows&amp;nbsp;over the&amp;nbsp;remaining&amp;nbsp;term of the swap agreements.&lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 12px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;On February&amp;nbsp;10, 2010, PNM filed an application with the NMPRC requesting approvals and authorizations to refund up to $403.8 million of callable PCRBs issued by the City of Farmington, New Mexico and the Maricopa County, Arizona Pollution Control Corporation (the "prior bonds") and to replace the prior bonds with new tax-exempt PCRBs. The proceeds from the prior bonds were used to finance a portion of the cost of certain pollution control systems, facilities and related improvements at SJGS and PVNGS. The NMPRC approved PNM's request on March&amp;nbsp;11, 2010. On June&amp;nbsp;9, 2010, $403.8 million of new PCRBs were sold by the City of Farmington, New Mexico and the Maricopa County, Arizona Pollution Control Corporation. The proceeds from the new PCRBs were utilized to retire the prior bonds, including those secured by PNM first mortgage bonds. The new PCRBs are collateralized by PNM senior unsecured notes, similar to PNM's other PCRBs. The new PCRBs were issued in eight separate series and bear interest at rates ranging from 4.00% to 6.25%. The final maturities of the new PCRBs range from 2040 to 2043, although $137.3 million are subject to mandatory tender and repurchase by PNM in 2015 through 2020. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 12px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;On October&amp;nbsp;21, 2010, PNM received an order from the NMPRC authorizing PNM to enter into a revolving credit facility of up to $400 million to replace the current PNM Facility; to increase the amount of PNM's intercompany loan arrangements to $100 million; and to issue up to $250 million of additional senior unsecured notes. The authorizations remain in effect through March&amp;nbsp;31, 2012. PNM, subject to receiving the necessary PNM and PNMR board approvals, will pursue increasing the amount of the PNM intercompany loan arrangement.&amp;nbsp;PNM has not entered into any agreements with regard to the authorizations relating to the replacement of the PNM Facility or additional senior unsecured notes, nor does it have any arrangements or commitments concerning them. PNM is unable to predict if, or when, such financing arrangements would be consummated. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 18px; margin-bottom: 0px;"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;&lt;b&gt;Convertible Preferred Stock &lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 6px; text-indent: 4%; margin-bottom: 0px;" align="justify"&gt;&lt;font style="font-family: Times New Roman;" class="_mt" size="2"&gt;In November 2008, PNMR issued 477,800 shares of Series A convertible preferred stock. The Series A convertible preferred stock is convertible into PNMR common stock in a ratio of 10 shares of common stock for each share of preferred stock. The Series A convertible preferred stock is entitled to receive dividends equivalent to any dividends paid on PNMR common stock as if the preferred stock had been converted into common stock. The Series A convertible preferred stock is entitled to vote on all matters voted upon by common stockholders, except for the election of the Board. In the event of liquidation of PNMR, preferred holders would receive a preference of $0.10 per common share equivalent. After that preference, common holders would receive an equivalent liquidation preference per share and all remaining distributions would be shared ratably between common and preferred holders using the number of shares of common stock into which the Series A convertible preferred stock is convertible. The terms of the Series A convertible preferred stock result in it being substantially equivalent to common stock. Therefore, for earnings per share purposes the number of common shares into which the Series A convertible preferred stock is convertible is included in the weighted average number of common shares outstanding. Similarly, dividends on the Series A convertible preferred stock are considered to be common dividends in the accompanying Condensed Consolidated Financial Statements. &lt;/font&gt;&lt;/p&gt;
&lt;p style="margin-top: 0px; margin-bottom: 0px; font-size: 18px;"&gt;&amp;nbsp;&lt;/p&gt;&lt;/div&gt; &lt;/div&gt;</NonNumbericText>
          <NonNumericTextHeader>(7)

Capitalization
Information concerning financing activities is contained in Note 6 of Notes to Consolidated Financial Statements in the 2009 Annual</NonNumericTextHeader>
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
        </Cell>
      </Cells>
      <OriginalInstanceReportColumns />
      <ElementDataType>us-types:textBlockItemType</ElementDataType>
      <SimpleDataType>textblock</SimpleDataType>
      <ElementDefenition>This item represents the entire disclosure related to the capitalization of the entity comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument.</ElementDefenition>
      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-K (SK)
 -Number 229
 -Section 303
 -Paragraph a
 -Subparagraph 1

</ElementReferences>
      <IsTotalLabel>false</IsTotalLabel>
    </Row>
  </Rows>
  <Footnotes />
  <NumberOfCols>1</NumberOfCols>
  <NumberOfRows>2</NumberOfRows>
  <HasScenarios>false</HasScenarios>
  <MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel>
  <SharesRoundingLevel>UnKnown</SharesRoundingLevel>
  <PerShareRoundingLevel>UnKnown</PerShareRoundingLevel>
  <HasPureData>false</HasPureData>
  <SharesShouldBeRounded>true</SharesShouldBeRounded>
</InstanceReport>
