﻿<?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>Commitments and Contingencies</ReportName>
  <ReportLongName>123 - Disclosure - Commitments and Contingencies</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>iso4217_USD</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>iso4217_USD_per_shares</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 />
          </DenominatorMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>pure</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>pure</MeasureValue>
            <MeasureNamespace />
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>shares</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace />
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
      </Units>
      <CurrencySymbol>$</CurrencySymbol>
    </Column>
  </Columns>
  <Rows>
    <Row>
      <Id>5</Id>
      <Label>Commitments and Contingencies</Label>
      <Level>3</Level>
      <ElementName>us-gaap_CommitmentsAndContingenciesDisclosureTextBlock</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 />
      <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;p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Note
15.&amp;#xA0;Commitments and Contingencies&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Other than the following
matters, there have been no significant developments regarding the
commitments and contingencies disclosed in Note 23 to the
Consolidated Financial Statements in Dominion&amp;#x2019;s and Virginia
Power&amp;#x2019;s Annual Report on Form 10-K for the year ended
December&amp;#xA0;31, 2009, or Note 15 to the Consolidated Financial
Statements in Dominion&amp;#x2019;s and Virginia Power&amp;#x2019;s Quarterly
Reports on Form 10-Q for the quarters ended March&amp;#xA0;31, 2010 and
June&amp;#xA0;30, 2010, respectively, nor have any significant new
matters arisen during the three months ended September&amp;#xA0;30,
2010.&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;&lt;i&gt;Guarantees&lt;/i&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Dominion&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;At September&amp;#xA0;30, 2010,
Dominion had issued $131 million of guarantees, primarily to
support equity method investees.&amp;#xA0;No significant amounts
related to these guarantees have been recorded. As of
September&amp;#xA0;30, 2010, Dominion&amp;#x2019;s exposure under these
guarantees was $54 million, primarily related to certain reserve
requirements associated with non-recourse financing.&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Dominion also enters into
guarantee arrangements on behalf of its consolidated subsidiaries,
primarily to facilitate their commercial transactions with third
parties. To the extent that a liability subject to a guarantee has
been incurred by one of Dominion&amp;#x2019;s consolidated subsidiaries,
that liability is included in Dominion&amp;#x2019;s Consolidated
Financial Statements. Dominion is not required to recognize
liabilities for guarantees issued on behalf of its subsidiaries
unless it becomes probable that it will have to perform under the
guarantees. Terms of the guarantees typically end once obligations
have been paid. Dominion currently believes it is unlikely that it
would be required to perform or otherwise incur any losses
associated with guarantees of its subsidiaries&amp;#x2019;
obligations.&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px"&gt;
&amp;#xA0;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;At September&amp;#xA0;30, 2010,
Dominion had issued the following subsidiary guarantees:&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px"&gt;
&amp;#xA0;&lt;/p&gt;
&lt;table border="0" cellspacing="0" cellpadding="0" width="76%" align="center"&gt;
&lt;tr&gt;
&lt;td width="78%"&gt;&lt;/td&gt;
&lt;td valign="bottom" width="6%"&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="6%"&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 valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&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" size="1"&gt;&lt;b&gt;Stated&amp;#xA0;Limit&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&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" size="1"&gt;&lt;b&gt;Value&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;(1)&lt;/sup&gt;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;(millions)&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" colspan="2"&gt;&lt;font size="1"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" colspan="2"&gt;&lt;font size="1"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&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" size="2"&gt;Subsidiary
debt&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;(2)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;
&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;126&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;126&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&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" size="2"&gt;Commodity
transactions&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;(3)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;
&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;3,001&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;231&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&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" size="2"&gt;Lease obligation for power
generation facility&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;(4)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;
&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;784&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;784&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&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" size="2"&gt;Nuclear
obligations&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;(5)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;
&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;231&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;52&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&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" size="2"&gt;Other&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;(6)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;
&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;500&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;139&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&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;#xA0;&amp;#xA0;&lt;/td&gt;
&lt;td style="BORDER-TOP: #000000 1px solid" valign="bottom"&gt;
&amp;#xA0;&lt;/td&gt;
&lt;td style="BORDER-TOP: #000000 1px solid" valign="bottom"&gt;
&amp;#xA0;&lt;/td&gt;
&lt;td&gt;&amp;#xA0;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
&lt;td style="BORDER-TOP: #000000 1px solid" valign="bottom"&gt;
&amp;#xA0;&lt;/td&gt;
&lt;td style="BORDER-TOP: #000000 1px solid" valign="bottom"&gt;
&amp;#xA0;&lt;/td&gt;
&lt;td&gt;&amp;#xA0;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td valign="top"&gt;
&lt;p style="TEXT-INDENT: -1em; MARGIN-LEFT: 3em"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Total&lt;/font&gt;&lt;/p&gt;
&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;4,642&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#xA0;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" align="right"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;1,332&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" nowrap="nowrap"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&amp;#xA0;&amp;#xA0;&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;#xA0;&amp;#xA0;&lt;/td&gt;
&lt;td style="BORDER-TOP: #000000 3px double" valign="bottom"&gt;
&amp;#xA0;&lt;/td&gt;
&lt;td style="BORDER-TOP: #000000 3px double" valign="bottom"&gt;
&amp;#xA0;&lt;/td&gt;
&lt;td&gt;&amp;#xA0;&lt;/td&gt;
&lt;td valign="bottom"&gt;&amp;#xA0;&amp;#xA0;&lt;/td&gt;
&lt;td style="BORDER-TOP: #000000 3px double" valign="bottom"&gt;
&amp;#xA0;&lt;/td&gt;
&lt;td style="BORDER-TOP: #000000 3px double" valign="bottom"&gt;
&amp;#xA0;&lt;/td&gt;
&lt;td&gt;&amp;#xA0;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 6px"&gt;
&amp;#xA0;&lt;/p&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" size="2"&gt;(1)&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" align="left"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Represents the estimated
portion of the guarantee&amp;#x2019;s stated limit that is utilized as
of September&amp;#xA0;30, 2010 based upon prevailing economic
conditions and fact patterns specific to each guarantee
arrangement. For those guarantees related to obligations that are
recorded as liabilities by Dominion&amp;#x2019;s subsidiaries, the value
includes the recorded amount.&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&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" size="2"&gt;(2)&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" align="left"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Guarantees of debt of
certain DEI subsidiaries. In the event of default by the
subsidiaries, Dominion would be obligated to repay such
amounts.&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&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" size="2"&gt;(3)&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" align="left"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Guarantees related to
energy trading and marketing activities and other commodity
commitments of certain subsidiaries. These guarantees were provided
to counterparties in order to facilitate physical and financial
transactions in gas, oil, electricity, pipeline capacity,
transportation and other energy-related commodities and services.
If any of these subsidiaries fail to perform or pay under the
contracts and the counterparties seek performance or payment,
Dominion would be obligated to satisfy such obligation. Dominion
and its subsidiaries receive similar guarantees as collateral for
credit extended to others. The value provided includes certain
guarantees that do not have stated limit amounts.&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&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" size="2"&gt;(4)&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" align="left"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Guarantee of a DEI
subsidiary&amp;#x2019;s leasing obligation for Fairless.&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&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" size="2"&gt;(5)&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" align="left"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Guarantees related to
certain DEI subsidiaries&amp;#x2019; potential retrospective premiums
that could be assessed if there is a nuclear incident under
Dominion&amp;#x2019;s nuclear insurance programs and guarantees for a
DEI subsidiary&amp;#x2019;s and Virginia Power&amp;#x2019;s commitment to buy
nuclear fuel. Excludes Dominion&amp;#x2019;s agreement to provide up to
$150 million and $60 million to two DEI subsidiaries to pay the
operating expenses of Millstone and Kewaunee, respectively, in the
event of a prolonged outage, as part of satisfying certain NRC
requirements concerned with ensuring adequate funding for the
operations of nuclear power stations.&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&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" size="2"&gt;(6)&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" align="left"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Guarantees related to other
miscellaneous contractual obligations such as leases, environmental
obligations and construction projects. Also includes guarantees
related to certain DEI subsidiaries&amp;#x2019; obligations for equity
capital contributions and energy generation associated with Fowler
Ridge and NedPower.&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Virginia
Power&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;As of September&amp;#xA0;30,
2010, Virginia Power had issued $16 million of guarantees primarily
to support tax-exempt debt issued through conduits. No significant
amounts related to these guarantees have been recorded.&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;&lt;i&gt;Spent Nuclear
Fuel&lt;/i&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In August 2010, Dominion
and the federal government reached a settlement resolving
Dominion&amp;#x2019;s claims for damages incurred at Kewaunee prior to
December&amp;#xA0;31, 2008 in connection with the government&amp;#x2019;s
failure to commence accepting spent nuclear fuel. The approximately
$21 million settlement payment was received in September 2010 and
was credited to the receivable from the government that Dominion
recognized as of June&amp;#xA0;30, 2010 for spent nuclear fuel-related
costs. Other lawsuits filed by Dominion and Virginia Power against
the DOE requesting damages incurred for spent nuclear fuel-related
costs at Millstone, Surry and North Anna remain pending. The
Companies will continue to manage their spent nuclear fuel until it
is accepted by the DOE.&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;&lt;i&gt;Surety Bonds and
Letters of Credit&lt;/i&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;As of September&amp;#xA0;30,
2010, Dominion had purchased $87 million of surety bonds, including
$39 million at Virginia Power, and authorized the issuance of
standby letters of credit by financial institutions of $166
million, including $94 million at Virginia Power, to facilitate
commercial transactions by its subsidiaries with third parties.
Under the terms of the surety bonds, the Companies are obligated to
indemnify the respective surety bond company for any amounts
paid.&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;&lt;i&gt;Environmental
Matters&lt;/i&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="PADDING-BOTTOM: 0px; MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The EPA has
finalized rules establishing a new 1-hour NAAQS for
NO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;2&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;(January 2010)
and a new 1-hour NAAQS for SO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;2&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;(June 2010),
which could require additional NO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;X&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;and
SO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;2&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;controls in
certain areas where the Companies operate. Until the states have
developed implementation plans for these standards, the impact on
Dominion&amp;#x2019;s or Virginia Power&amp;#x2019;s facilities that emit
NO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;X&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;and
SO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;2&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;is uncertain.
However, based on a preliminary assessment, Dominion has determined
that the new 1-hour SO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;2&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;NAAQS will
likely require significant future capital expenditures at State
Line, and has recorded an impairment charge on this facility as
detailed in Note 9. In January 2010, the EPA proposed a new, more
stringent NAAQS for ozone and in July 2010, the EPA announced a
proposed new rule, called the &amp;#x201C;Transport Rule,&amp;#x201D; which
will eventually replace the current &amp;#x201C;Clean Air Interstate
Rule&amp;#x201D; and as proposed requires significant reductions in
SO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;2&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;and
NO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;X&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;emissions.
Until this rulemaking is complete and states have developed
implementation plans for the new standards, it is not possible to
determine the impact on Dominion&amp;#x2019;s or Virginia Power&amp;#x2019;s
facilities that emit NO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;X&lt;/sub&gt;&lt;/font&gt;
&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;and
SO&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sub style="POSITION: relative; VERTICAL-ALIGN: baseline; TOP: 0.4ex"&gt;2&lt;/sub&gt;&lt;/font&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;.&amp;#xA0;The Companies cannot currently predict whether or
to what extent the new rule will ultimately require additional
controls.&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;&lt;i&gt;Water&lt;/i&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In October 2007, the VSWCB
issued a VPDES permit for North Anna. The BREDL, and other persons,
appealed the VSWCB&amp;#x2019;s decision to the Richmond Circuit Court,
challenging several permit provisions related to North Anna&amp;#x2019;s
discharge of cooling water. In February 2009, the court ruled that
the VSWCB was required to regulate the thermal discharge from North
Anna into the waste heat treatment facility. Virginia Power filed a
motion for reconsideration with the court in February 2009, which
was denied. The final order was issued by the court in September
2009. The court&amp;#x2019;s order allows North Anna to continue to
operate pursuant to the currently issued VPDES permit. In October
2009, Virginia Power filed a Notice of Appeal of the court&amp;#x2019;s
Order with the Richmond Circuit Court, initiating the appeals
process to the Virginia Court of Appeals. In June 2010, the
Virginia Court of Appeals reversed the Richmond Circuit
Court&amp;#x2019;s September 2009 order. The Virginia Court of Appeals
held that the lower court had applied the wrong standard of review,
and that the VSWCB&amp;#x2019;s determination not to regulate the
station&amp;#x2019;s thermal discharge into the waste heat treatment
facility was lawful.&amp;#xA0;In July 2010, BREDL and the other
original appellants filed a petition for appeal to the Supreme
Court of Virginia requesting that it review the Court of
Appeals&amp;#x2019; decision.&lt;/font&gt;&lt;/p&gt;
&lt;p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;An administrative hearing
with the Connecticut Department of Environmental Protection to
renew the National Pollutant Discharge Elimination System Permit
for Millstone, which allows Millstone to return water used in the
generating process to its source, was completed in February 2009.
In September 2010, the permit was reissued under the Clean Water
Act. The conditions of the permit require an evaluation of control
technologies that could result in additional expenditures in the
future, however Dominion cannot currently predict the outcome of
this evaluation. In October 2010, the permit issuance was appealed
to the state court by a private plaintiff. The permit is expected
to remain in effect during the appeal.&lt;/font&gt;&lt;/p&gt;
&lt;/div&gt;</NonNumbericText>
          <NonNumericTextHeader>Note
15.&amp;#xA0;Commitments and Contingencies
Other than the following
matters, there have been no significant developments regarding the
commitments and</NonNumericTextHeader>
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
        </Cell>
      </Cells>
      <OriginalInstanceReportColumns />
      <ElementDataType>us-types:textBlockItemType</ElementDataType>
      <SimpleDataType>textblock</SimpleDataType>
      <ElementDefenition>Includes disclosure of commitments and contingencies. This element may be used as a single block of text to encapsulate the entire disclosure including data and tables.</ElementDefenition>
      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name FASB Interpretation (FIN)
 -Number 14
 -Paragraph 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 5
 -Paragraph 9, 10, 11, 12

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