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</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Nevada Power Company [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>nve_NevadaPowerCompanyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Additional Paid-in Capital [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AdditionalPaidInCapitalMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Nevada Power Company [Member]" /><Label Key="" Id="1" Label="Additional Paid-in Capital [Member]" /></Labels></Column><Column FlagID="0"><Id>10</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Nevada Power Company [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>nve_NevadaPowerCompanyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Retained Earnings [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_RetainedEarningsMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Nevada Power Company [Member]</string><string>Retained Earnings [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Nevada Power Company [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>nve_NevadaPowerCompanyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Retained Earnings [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_RetainedEarningsMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Nevada Power Company [Member]" /><Label Key="" Id="1" Label="Retained Earnings [Member]" /></Labels></Column><Column FlagID="0"><Id>11</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Nevada Power Company [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>nve_NevadaPowerCompanyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Accumulated Other Comprehensive Income (Loss) [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedOtherComprehensiveIncomeMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Nevada Power Company [Member]</string><string>Accumulated Other Comprehensive Income (Loss) [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Nevada Power Company [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>nve_NevadaPowerCompanyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Accumulated Other Comprehensive Income (Loss) [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedOtherComprehensiveIncomeMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Nevada Power Company [Member]" /><Label Key="" Id="1" Label="Accumulated Other Comprehensive Income (Loss) [Member]" /></Labels></Column><Column FlagID="0"><Id>12</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Sierra Pacific Power Company [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>nve_SierraPacificPowerCompanyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Equity Component [Domain]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>us-gaap_EquityComponentDomain</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Sierra Pacific Power Company [Member]</string><string>Equity Component [Domain]</string></SegmentLabels><Unit><OtherUnits><UnitProperty><UnitID>Shares</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnitProperty></OtherUnits><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

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 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph 25

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 45

 -Paragraph 16

 -URI http://asc.fasb.org/extlink&amp;oid=7656940&amp;loc=SL4568740-111683



Reference 5: http://www.xbrl.org/2003/role/presentationRef

 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph A3

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 55

 -Paragraph 4I

 -URI http://asc.fasb.org/extlink&amp;oid=18733213&amp;loc=SL4590271-111686



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Reference 8: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 50

 -Paragraph 1A

 -Subparagraph (a),(c)

 -URI http://asc.fasb.org/extlink&amp;oid=18733093&amp;loc=SL4573702-111684



Reference 9: http://www.xbrl.org/2003/role/presentationRef

 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph 5

 -Subparagraph b

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 220

 -SubTopic 10

 -Section 45

 -Paragraph 10A

 -Subparagraph (d)

 -URI http://asc.fasb.org/extlink&amp;oid=20435746&amp;loc=SL7669646-108580



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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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 -SubTopic 10

 -Section S99

 -Paragraph 1

 -Subparagraph (SX 210.5-02.29)

 -URI http://asc.fasb.org/extlink&amp;oid=6877327&amp;loc=d3e13212-122682



Reference 6: http://www.xbrl.org/2003/role/presentationRef

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 02

 -Paragraph 30

 -Article 5



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 -Publisher AICPA

 -Name Accounting Principles Board Opinion (APB)

 -Number 12

 -Paragraph 10

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 04

 -Article 3



Reference 3: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 505

 -SubTopic 10

 -Section 50

 -Paragraph 2

 -URI http://asc.fasb.org/extlink&amp;oid=6928386&amp;loc=d3e21463-112644



Reference 4: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 505

 -SubTopic 10

 -Section S99

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 -Subparagraph (SX 210.3-04)

 -URI http://asc.fasb.org/extlink&amp;oid=6959260&amp;loc=d3e187085-122770



Reference 5: http://www.xbrl.org/2003/role/presentationRef

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 -Name Accounting Standards Codification

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 -SubTopic 10

 -Section S99

 -Paragraph 1

 -Subparagraph (SX 210.5-02.29)

 -URI http://asc.fasb.org/extlink&amp;oid=6877327&amp;loc=d3e13212-122682



Reference 6: http://www.xbrl.org/2003/role/presentationRef

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 02

 -Paragraph 30

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