XML 25 R42.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Significant Accounting Policies Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 9,947.2us-gaap_PropertyPlantAndEquipmentGross $ 9,499.2us-gaap_PropertyPlantAndEquipmentGross  
Accumulated Depreciation 3,005.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 2,864.6us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, Plant and Equipment, Net 6,941.5us-gaap_PropertyPlantAndEquipmentNet 6,634.6us-gaap_PropertyPlantAndEquipmentNet  
OG&E [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 9,947.2us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
9,499.2us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
 
Accumulated Depreciation 3,005.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
2,864.6us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
 
Property, Plant and Equipment, Net 6,941.5us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
6,634.6us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
 
Capitalized Computer Software, Gross 33.6us-gaap_CapitalizedComputerSoftwareNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
16.8us-gaap_CapitalizedComputerSoftwareNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
 
Capitalized Computer Software, Amortization 5.2us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= ogec_OgAndEMember
4.0us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= ogec_OgAndEMember
4.2us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= ogec_OgAndEMember
Electric Transmission and Distribution Equipment [Member] | OG&E [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 3,559.5us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
3,403.8us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
 
Accumulated Depreciation 1,086.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
1,028.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
 
Property, Plant and Equipment, Net 2,472.8us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
2,375.6us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
 
Electric Generation Equipment [Member] | OG&E [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 3,620.1us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[1] 3,551.0us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[2]  
Accumulated Depreciation 1,345.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[1] 1,306.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[2]  
Property, Plant and Equipment, Net 2,275.0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[1] 2,244.9us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[2]  
Amount of Acquisition Adjustments 148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
 
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation 34.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
28.8us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
 
Electric Transmission [Member] | OG&E [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 2,370.0us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[3] 2,163.7us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[4]  
Accumulated Depreciation 417.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[3] 385.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[4]  
Property, Plant and Equipment, Net 1,952.2us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[3] 1,778.7us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[4]  
Amount of Acquisition Adjustments 3.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
3.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
 
Amount of Acquistion Adjustments Related Accumulated Amortization 0.4ogec_AmountOfAcquistionAdjustmentsRelatedAccumulatedAmortization
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
0.3ogec_AmountOfAcquistionAdjustmentsRelatedAccumulatedAmortization
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
 
Finite-Lived Intangible Assets, Major Class Name [Domain] | OG&E [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 67.6us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ogec_FiniteLivedIntangibleAssetsMajorClassNameMember
50.5us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ogec_FiniteLivedIntangibleAssetsMajorClassNameMember
 
Accumulated Depreciation 31.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ogec_FiniteLivedIntangibleAssetsMajorClassNameMember
27.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ogec_FiniteLivedIntangibleAssetsMajorClassNameMember
 
Property, Plant and Equipment, Net 36.5us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ogec_FiniteLivedIntangibleAssetsMajorClassNameMember
23.4us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ogec_FiniteLivedIntangibleAssetsMajorClassNameMember
 
Property, Plant and Equipment, Other Types [Member] | OG&E [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 330.0us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
330.2us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
 
Accumulated Depreciation 125.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
118.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
 
Property, Plant and Equipment, Net 205.0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
212.0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= ogec_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
 
McClain Plant [Member]      
Property, Plant and Equipment [Line Items]      
Jointly Owned Utility Plant, Proportionate Ownership Share 77.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
[5] 77.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
[6]  
Property, Plant and Equipment, Gross 207.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
[5] 183.2us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
[6]  
Accumulated Depreciation 46.6us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
[5] 62.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
[6]  
Property, Plant and Equipment, Net 161.1us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
[5] 120.4us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
[6]  
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 0.5us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
0.1us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_McclainPlantMember
 
Redbud Plant [Member]      
Property, Plant and Equipment [Line Items]      
Jointly Owned Utility Plant, Proportionate Ownership Share 51.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
[5],[7] 51.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
[6],[8]  
Property, Plant and Equipment, Gross 484.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
[5],[7] 498.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
[6],[8]  
Accumulated Depreciation 81.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
[5],[7] 89.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
[6],[8]  
Property, Plant and Equipment, Net 402.3us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
[5],[7] 409.2us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
[6],[8]  
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 0.4us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
39.5us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
 
Amount of Acquisition Adjustments 148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
 
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation $ 34.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
$ 28.8us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ogec_RedbudPlantMember
 
[1] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $34.3 million.
[2] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $28.8 million
[3] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.4 million
[4] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.3 million.
[5] Construction work in progress was $0.5 million and $0.4 million for the McClain and Redbud Plants, respectively.
[6] Construction work in progress was $0.1 million and $39.5 million for the McClain and Redbud Plants, respectively.
[7] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $34.3 million.
[8] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $28.8 million.