2.2.0.25falsefalse0511 - Disclosure - Derivatives (Tables)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010
USD ($)
USD ($) / shares
$Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000092122duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0so_DerivativesTablesAbstractsofalsenadurationDerivatives Tables Abstract.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse| 1falsefalsefalse00falsefalsefalsefalsefalse | Otherxbrli:stringItemTypestringDerivatives Tables Abstract.falsefalse
3false0us-gaap_ScheduleOfDerivativeInstrumentsTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note11_table1 - us-gaap:ScheduleOfDerivativeInstrumentsTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="8%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="center" colspan="9" style="border-bottom: 1px solid #000000"><b>Power</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11" style="border-bottom: 1px solid #000000"><b>Gas</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Longest</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Longest</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Net</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Longest</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Longest</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="center"><b>Net Sold</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Hedge</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Non-Hedge</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Purchased</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Hedge</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><b>Non-Hedge</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Megawatt-hours</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Date</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Date</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>mmBtu*</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Date</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>Date</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="center"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom">
<td align="center">
<div style="margin-left:15px; text-indent:-15px">1
</div></td>
<td> </td>
<td align="center" colspan="3">2011</td>
<td> </td>
<td align="center" colspan="3">2011</td>
<td> </td>
<td align="center" colspan="3">149</td>
<td> </td>
<td align="center" colspan="3">2015</td>
<td> </td>
<td align="center" colspan="3">2015</td>
</tr>
<!-- End Table Body -->
</table>
</div>
<div style="margin-top: 3pt">
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; text-align: left">
<tr>
<td width="3%"></td>
<td width="1%"></td>
<td width="96%"></td>
</tr>
<tr valign="top">
<td nowrap="nowrap" align="left">*</td>
<td> </td>
<td>million British thermal units</td>
</tr>
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringA table or schedule that identifies and provides pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.No authoritative reference available.falsefalse
4false0so_NotionalAmountOfInterestRateDerivativesTextBlocksofalsenadurationNotional amount of interest rate derivatives.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note11_table2 - so:NotionalAmountOfInterestRateDerivativesTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="40%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="7%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="7%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>Fair Value</b></td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>Gain (Loss)</b></td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>Notional</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center"><b>Interest Rate</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>Interest Rate</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center"><b>Hedge</b> <b>Maturity</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>December 31,</b></td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000"><b>Amount</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Received</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000"><b>Paid</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Date</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td colspan="7" align="left"><b><i>Cash flow hedges of existing debt</i></b></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">300</td>
<td> </td>
<td> </td>
<td align="center" valign="bottom" nowrap="nowrap">3-month LIBOR +<br />0.40% spread</td>
<td> </td>
<td align="center" colspan="3">1.24%*</td>
<td> </td>
<td align="center" valign="bottom">October 2011</td>
<td> </td>
<td nowrap="nowrap" align="left">$</td>
<td align="right">(1</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td colspan="7" align="left"><b><i>Fair value hedges of existing debt</i></b></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td> </td>
<td align="right">350</td>
<td> </td>
<td> </td>
<td align="center" valign="bottom">4.15%</td>
<td> </td>
<td colspan="3" align="center" nowrap="nowrap">3-month LIBOR +<br />1.96%* spread</td>
<td> </td>
<td align="center" valign="bottom">May 2014</td>
<td> </td>
<td> </td>
<td align="right">10</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="5" align="left" style="border-top: 1px solid #000000"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000; border-top: 1px solid #000000"> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">650</td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="left">$</td>
<td align="right">9</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="5" align="left" style="border-top: 3px double #000000"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000; border-top: 3px double #000000"> </td>
<td> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
<div style="margin-top: 3pt">
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; text-align: left">
<tr>
<td width="3%"></td>
<td width="1%"></td>
<td width="96%"></td>
</tr>
<tr valign="top">
<td nowrap="nowrap" align="left">*</td>
<td> </td>
<td>Weighted Average</td>
</tr>
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringNotional amount of interest rate derivatives.No authoritative reference available.falsefalse
5false0so_OutstandingForeignCurrencyDerivativesTextBlocksofalsenadurationOutstanding foreign currency derivatives.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note11_table3 - so:OutstandingForeignCurrencyDerivativesTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="40%"> </td>
<td width="5%"> </td>
<td width="7%"> </td>
<td width="5%"> </td>
<td width="7%"> </td>
<td width="5%"> </td>
<td width="7%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
<td width="5%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>Fair Value</b></td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>Gain (Loss)</b></td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center"><b>Notional</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>Hedge Maturity</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><b>December 31,</b></td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Amount</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Forward Rate</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b> Date</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td colspan="5" align="left"><b><i>Cash flow hedges of forecasted transactions</i></b></td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="center" valign="top">YEN82</td>
<td> </td>
<td align="center" valign="bottom">85.326 Yen per <br />
Dollar*</td>
<td> </td>
<td align="center" valign="top" nowrap="nowrap">Various through May 2011</td>
<td> </td>
<td align="left" valign="top">$</td>
<td align="right" valign="top">—</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td colspan="5" align="left"><b><i>Fair value hedges of firm commitments</i></b></td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="center" valign="top">EUR41.1</td>
<td> </td>
<td align="center" valign="bottom" nowrap="nowrap">1.256 Dollars per <br />
Euro*</td>
<td> </td>
<td align="center" valign="top" nowrap="nowrap">Various through July 2012</td>
<td> </td>
<td> </td>
<td align="right" valign="top">3</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="2" align="left" style="border-top: 1px solid #000000"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000; border-top: 1px solid #000000"> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="center" valign="bottom"> </td>
<td> </td>
<td align="left">$</td>
<td align="right">3</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="2" align="left" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000; border-top: 3px double #000000"> </td>
<td> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
<div style="margin-top: 3pt">
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; text-align: left">
<tr>
<td width="3%"></td>
<td width="1%"></td>
<td width="96%"></td>
</tr>
<tr valign="top">
<td nowrap="nowrap" align="left">*</td>
<td> </td>
<td>Weighted Average</td>
</tr>
</table>
</div>
</div>
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<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringOutstanding foreign currency derivatives.No authoritative reference available.falsefalse
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<!-- Begin Block Tagged Note Table: SO-20101231_note11_table4 - us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="35%"> </td>
<td width="5%"> </td>
<td width="10%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="12%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td colspan="8" nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000">            <b>Asset Derivatives</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td colspan="9" nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000">            <b>Liability Derivatives</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 0px solid #000000"><b>Balance Sheet</b></td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center"><b>Balance Sheet</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="3"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>Derivative Category</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Location</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Location</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i style="font-size: 8pt">(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Derivatives designated as hedging instruments for regulatory purposes</b>
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td valign="top">
<div style="margin-left:30px; text-indent:-15px">Energy-related derivatives:
</div></td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other current assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>4</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">1</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left" nowrap="nowrap">
<div style="margin-left:15px; text-indent:-15px">Liabilities from risk <br />management activities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>145</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">111</td>
<td nowrap="nowrap"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left" nowrap="nowrap">
<div style="margin-left:15px; text-indent:-15px">Other deferred<br />charges and assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>3</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">1</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other deferred credits and liabilities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>55</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">66</td>
<td nowrap="nowrap"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Total derivatives designated as hedging instruments for regulatory purposes</b>
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>7</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">2</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>200</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">177</td>
<td nowrap="nowrap"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom"><!-- Blank Space -->
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Derivatives designated as hedging instruments in cash flow and fair value hedges</b>
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td valign="top">
<div style="margin-left:30px; text-indent:-15px">Energy-related derivatives:
</div></td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other current assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>—</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">3</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Liabilities from risk management activities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>1</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">5</td>
<td nowrap="nowrap"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:30px; text-indent:-15px">Interest rate derivatives:
</div></td>
<td> </td>
<td align="left">Other current assets
</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>6</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">3</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Liabilities from risk management activities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>1</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">6</td>
<td nowrap="nowrap"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other deferred charges and assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>4</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">—</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other deferred credits and liabilities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>—</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">—</td>
<td nowrap="nowrap"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:30px; text-indent:-15px">Foreign currency derivatives:
</div></td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other current assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>2</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">—</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Liabilities from risk management activities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>—</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">—</td>
<td nowrap="nowrap"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other deferred charges and assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>1</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">—</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other deferred credits and liabilities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>—</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">—</td>
<td nowrap="nowrap"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Total derivatives designated as hedging instruments in cash flow and fair value hedges</b>
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>13</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">6</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>2</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">11</td>
<td nowrap="nowrap"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom"><!-- Blank Space -->
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Derivatives not designated as hedging instruments</b>
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:30px; text-indent:-15px">Energy-related derivatives:
</div></td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other current assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>2</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">2</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Liabilities from risk management activities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>5</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">3</td>
<td nowrap="nowrap"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other deferred charges and assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>1</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">—</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left">
<div style="margin-left:15px; text-indent:-15px">Other deferred credits and liabilities
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>—</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">—</td>
<td nowrap="nowrap"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Total derivatives not designated as hedging instruments</b>
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>3</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">2</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>5</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">3</td>
<td nowrap="nowrap"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"><b>Total</b>
</div></td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>23</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">10</td>
<td nowrap="nowrap"> </td>
<td> </td>
<td align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>207</b></td>
<td nowrap="nowrap"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">191</td>
<td nowrap="nowrap"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringThis element can be used as an alternative for disclosing the entity's tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position as a single block of text.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph a
falsefalse
7false0so_PreTaxEffectOfUnrealizedDerivativeGainsLossesTextBlocksofalsenadurationPre Tax Effect Of Unrealized Derivative Gains Losses.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note11_table5 - so:PreTaxEffectOfUnrealizedDerivativeGainsLossesTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="35%"> </td>
<td width="5%"> </td>
<td width="10%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="12%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="9" style="border-bottom: 1px solid #000000"><b>Unrealized Losses</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="9" style="border-bottom: 1px solid #000000"><b>Unrealized Gains</b></td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 0px solid #000000"><b>Balance Sheet</b></td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 0px solid #000000"><b>Balance Sheet</b></td>
<td style="border-bottom: 0px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 0px solid #000000"> </td>
<td style="border-bottom: 0px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 0px solid #000000"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>Derivative Category</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Location</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Location</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i style="font-size: 8pt">(in millions)</i></td>
<td> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="7"><i style="font-size: 8pt">(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:30px; text-indent:-15px">Energy-related derivatives:
</div></td>
<td> </td>
<td align="left" valign="top">
<div style="margin-left:15px; text-indent:-15px">Other regulatory assets, current
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>(145</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">(111</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td align="left" valign="top">
<div style="margin-left:15px; text-indent:-15px">Other regulatory liabilities, current
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>4</b></td>
<td nowrap="nowrap" valign="top"> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">1</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr valign="bottom">
<td valign="top">
<div style="margin-left:0px; text-indent:-0px"> 
</div></td>
<td> </td>
<td align="left" valign="top" nowrap="nowrap">
<div style="margin-left:15px; text-indent:-15px">Other regulatory <br />assets, deferred
</div></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right"><b>(55</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(66</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td align="left" valign="top" nowrap="nowrap">
<div style="margin-left:15px; text-indent:-15px">Other regulatory <br />liabilities, deferred
</div></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right"><b>3</b></td>
<td nowrap="nowrap" valign="top"> </td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right">1</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" valign="top" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:0px; text-indent:-0px"><b>Total energy-related derivative gains (losses)</b>
</div></td>
<td> </td>
<td align="left" valign="top"> </td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"><b>$</b></td>
<td align="right" valign="top"><b>(200</b></td>
<td nowrap="nowrap" valign="top"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top">$</td>
<td align="right" valign="top">(177</td>
<td nowrap="nowrap" valign="top">)</td>
<td> </td>
<td align="left" valign="top"> </td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top"><b>$</b></td>
<td align="right" valign="top"><b>7</b></td>
<td nowrap="nowrap" valign="top"> </td>
<td> </td>
<td nowrap="nowrap" align="right" valign="top">$</td>
<td align="right" valign="top">2</td>
<td nowrap="nowrap" valign="top"> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="21" valign="top" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringPre Tax Effect Of Unrealized Derivative Gains Losses.No authoritative reference available.falsefalse
8false0us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note11_table6 - us-gaap:ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 9pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="23%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="7%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 9pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11"><b>Gain (Loss) Recognized in</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="13"><b>Gain (Loss) Reclassified from Accumulated OCI into Income</b></td>
</tr>
<tr style="font-size: 9pt" valign="bottom">
<td nowrap="nowrap" align="left"><b>Derivatives in Cash Flow</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11"><b>OCI on Derivative</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="13" style="border-bottom: 1px solid #000000"><b>(Effective Portion)</b></td>
</tr>
<tr style="font-size: 9pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>Hedging Relationships</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="11" style="border-bottom: 1px solid #000000"><b>(Effective Portion)</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="11" style="border-bottom: 1px solid #000000"><b>Amount</b></td>
</tr>
<tr style="font-size: 9pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>Derivative Category</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2008</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"><b>Statements of Income Location</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2008</td>
</tr>
<tr style="font-size: 8pt" valign="bottom">
<td nowrap="nowrap" align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11"><i>(in millions)</i></td>
<td> </td>
<td nowrap="nowrap" align="center"> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="12"><i>(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:15px; text-indent:-15px">Energy-related derivatives
</div></td>
<td valign="top"> </td>
<td align="right" valign="top"><b>$</b></td>
<td align="right" valign="top"><b>1</b></td>
<td valign="top"> </td>
<td valign="top"> </td>
<td nowrap="nowrap" align="right" valign="top">$</td>
<td align="right" valign="top">(2</td>
<td nowrap="nowrap" valign="top">)</td>
<td valign="top"> </td>
<td nowrap="nowrap" align="right" valign="top">$</td>
<td align="right" valign="top">(1</td>
<td nowrap="nowrap" valign="top">)</td>
<td> </td>
<td align="left" valign="bottom">Fuel</td>
<td> </td>
<td align="right"><b>$</b></td>
<td align="right"><b>—</b></td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td align="right">$</td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom">
<td valign="top">
<div style="margin-left:15px; text-indent:-15px">Interest rate derivatives
</div></td>
<td valign="top"> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right" valign="top"><b>(3</b></td>
<td nowrap="nowrap" valign="top"><b>)</b></td>
<td valign="top"> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right" valign="top">(5</td>
<td nowrap="nowrap" valign="top">)</td>
<td valign="top"> </td>
<td nowrap="nowrap" align="right" valign="top"> </td>
<td align="right" valign="top">(47</td>
<td nowrap="nowrap" valign="top">)</td>
<td> </td>
<td align="left" valign="bottom">
<div style="margin-left:15px; text-indent:-15px">Interest expense, net of amounts
capitalized
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(25</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(46</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(19</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td valign="top">
<div style="margin-left:15px; text-indent:-15px">Foreign currency derivatives
</div></td>
<td valign="top"> </td>
<td valign="top"> </td>
<td align="right" valign="top"><b>1</b></td>
<td valign="top"> </td>
<td valign="top"> </td>
<td valign="top"> </td>
<td align="right" valign="top">—</td>
<td valign="top"> </td>
<td valign="top"> </td>
<td valign="top"> </td>
<td align="right" valign="top">—</td>
<td valign="top"> </td>
<td> </td>
<td align="left" valign="bottom">
<div style="margin-left:15px; text-indent:-15px">Other operations and
maintenance
</div></td>
<td> </td>
<td> </td>
<td align="right"><b>1</b></td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="27" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Total
</div></td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>(1</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">(7</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">(48</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td align="left" valign="bottom"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>(24</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">(46</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">(19</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="27" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Notefalsefalsefalsefalsefalse | Otherus-types:textBlockItemTypestringSchedule of the location and amount of gains and losses reported in the statement of financial performance (or when applicable, the statement of financial position, for example, gains and losses initially recognized in other comprehensive income) on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b
falsefalse
9false0so_PreTaxEffectOfEnergyRelatedDerivativesNotDesignatedAsHedgingInstrumentsTextBlocksofalsenadurationPre Tax Effect Of Energy Related Derivatives Not Designated As Hedging Instrumentsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel| 1falsefalsefalse00<!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" -->
<!-- Begin Block Tagged Note Table: SO-20101231_note11_table7 - so:PreTaxEffectOfEnergyRelatedDerivativesNotDesignatedAsHedgingInstrumentsTextBlock-->
<div align="left" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="20%"> </td>
<td width="5%"> </td>
<td width="7%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="5%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
</tr>
<tr style="font-size: 9pt" valign="bottom">
<td><b>Derivatives not Designated</b></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="13" style="border-bottom: 1px solid #000000"><b>Unrealized Gain (Loss) Recognized in Income</b></td>
</tr>
<tr style="font-size: 9pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>as Hedging Instruments</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="11" style="border-bottom: 1px solid #000000"><b>Amount</b></td>
</tr>
<tr style="font-size: 9pt" valign="bottom">
<td nowrap="nowrap" align="left" style="border-bottom: 1px solid #000000"><b>Derivative Category</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td style="border-bottom: 1px solid #000000" nowrap="nowrap"><b>Statements of Income Location</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000"><b>2010</b></td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2009</td>
<td style="border-bottom: 1px solid #000000"> </td>
<td nowrap="nowrap" align="center" colspan="3" style="border-bottom: 1px solid #000000">2008</td>
</tr>
<tr style="font-size: 9pt" valign="bottom">
<td nowrap="nowrap" align="left"> </td>
<td> </td>
<td nowrap="nowrap" align="center" style="border-bottom: 1px solid #000000"></td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="11"><i style="font-size: 8pt">(in millions)</i></td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Energy-related derivatives:
</div></td>
<td> </td>
<td align="left" valign="top">Wholesale revenues</td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td align="right">$</td>
<td align="right">5</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">(2</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left" valign="top">Fuel</td>
<td> </td>
<td> </td>
<td align="right"><b>1</b></td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(6</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td> </td>
<td align="right">5</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td align="left" valign="top">Purchased power</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right"><b>(1</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(4</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="right"> </td>
<td align="right">(2</td>
<td nowrap="nowrap">)</td>
</tr>
<tr style="font-size: 1px">
<td colspan="15" align="left" style="border-top: 1px solid #000000"> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Total
</div></td>
<td> </td>
<td align="left" valign="top"> </td>
<td> </td>
<td nowrap="nowrap" align="right"><b>$</b></td>
<td align="right"><b>(2</b></td>
<td nowrap="nowrap"><b>)</b></td>
<td> </td>
<td nowrap="nowrap" align="right">$</td>
<td align="right">(5</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td align="right">$</td>
<td align="right">1</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td colspan="15" align="left" style="border-top: 3px double #000000"> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
</div>
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18Derivatives (Tables)UnKnownUnKnownUnKnownUnKnownfalsetrue