XML 91 R72.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Rate Matters and Regulation (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Public Utilities, Approved Equity Capital Structure, Percentage | 53.00% |
Public Utilities, Approved Debt Capital Structure, Percentage | 47.00% |
Interim Rate Refund Amount | $ 47.5 |
Regulatory Assets, Current | 40.8 | $ 121.8
Recommended Disallowance for Fuel Adjustment | $ 3.3 |
Administrative Law Judge [Member] |  |
Recommended Return on Equity | 9.87% |
Recommended Increase (Decrease) in Revenue | $ 40.7 |
Recommended Capital Structure, Equity Percentage | 53.00% |
Recommended Capital Structure, Debt Percentage | 47.00% |
Oklahoma Corporation Commission [Member] |  |
OG&E's Jurisdictional Revenues | 85.00% |
Arkansas Public Service Commission [Member] |  |
OG&E's Jurisdictional Revenues | 8.00% |
Federal Energy Regulatory Commission [Member] |  |
OG&E's Jurisdictional Revenues | 7.00% |
Dry Scrubber Project [Member] |  |
Estimated Environmental Capital Costs | $ 542.4 |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 401.3 |
Mustang Modernization [Member] |  |
Estimated Environmental Capital Costs | 390.0 |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | $ 348.4 |
OKLAHOMA |  |
Public Utilities, Requested Equity Capital Structure, Percentage | 53.00% |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 92.5 |
Public Utilities, Requested Return on Equity, Percentage | 10.25% |
Investments Since Last Rate Case | $ 1,600.0 |
Public Utilities, Interim Rate Increase (Decrease), Amount | 69.5 |
Interim Rate Revenue Reserved | 5.6 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 8.8 |
Public Utilities, Approved Return on Equity, Percentage | 9.50% |
Approved Depreciation Reduction from ALJ Recommendation | $ 28.6 |
ALJ Depreciation Recommendation | $ 36.4 |
Approved Recovery of Short-term Incentive Comp | 50.00% |
ARKANSAS |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 16.5 |
Public Utilities, Requested Return on Equity, Percentage | 10.25% |
Investments Since Last Rate Case | $ 3,000.0 |
Settlement of Rate Increase | $ 7.1 |
Settlement of Return on Equity, Percentage | 9.50% |
Settlement of Equity Capital Structure, Percentage | 50.00% |
Oklahoma demand program rider under recovery [Member] |  |
Regulatory Assets, Current | $ 31.6 | $ 51.0
January 16, 2018 [Member] | OKLAHOMA |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 1.9 |
Public Utilities, Requested Return on Equity, Percentage | 9.90% |
FERC [Member] |  |
Recommended Common Equity Percentage | 7.85% |
Public Utilities, Approved Return on Equity, Percentage | 10.60% |
Revenue impact of recommended change in return on common equity | $ 1.5 |

X
- Definition ALJ Depreciation Recommendation + References No definition available. + Details
Name: | oge_ALJDepreciationRecommendation
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Approved Depreciation Reduction from ALJ Recommendation + References No definition available. + Details
Name: | oge_ApprovedDepreciationReductionfromALJRecommendation
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Approved Recovery of Short-term Incentive Comp + References No definition available. + Details
Name: | oge_ApprovedRecoveryofShorttermIncentiveComp
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated Environmental Capital Costs + References No definition available. + Details
Name: | oge_EstimatedEnvironmentalCapitalCosts
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Interim Rate Refund Amount + References No definition available. + Details
Name: | oge_InterimRateRefundAmount
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Interim Rate Revenue Reserved + References No definition available. + Details
Name: | oge_InterimRateRevenueReserved
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Investments Since Last Rate Case + References No definition available. + Details
Name: | oge_InvestmentsSinceLastRateCase
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition OG&E's Jurisdictional Revenues + References No definition available. + Details
Name: | oge_OgesJurisdictionalRevenues
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recommended Capital Structure, Debt Percentage + References No definition available. + Details
Name: | oge_RecommendedCapitalStructureDebtPercentage
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recommended Capital Structure, Equity Percentage + References No definition available. + Details
Name: | oge_RecommendedCapitalStructureEquityPercentage
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recommended Common Equity Percentage + References No definition available. + Details
Name: | oge_RecommendedCommonEquityPercentage
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recommended Disallowance for Fuel Adjustment + References No definition available. + Details
Name: | oge_RecommendedDisallowanceforFuelAdjustment
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Recommended Increase (Decrease) in Revenue + References No definition available. + Details
Name: | oge_RecommendedIncreaseDecreaseinRevenue
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Recommended Return on Equity + References No definition available. + Details
Name: | oge_RecommendedReturnonEquity
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue Impact of Recommended Change in Return on Common Equity + References No definition available. + Details
Name: | oge_Revenueimpactofrecommendedchangeinreturnoncommonequity
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Settlement of Equity Capital Structure, Percentage + References No definition available. + Details
Name: | oge_SettlementofEquityCapitalStructurePercentage
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Settlement of Rate Increase + References No definition available. + Details
Name: | oge_SettlementofRateIncrease
Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Settlement of Return on Equity, Percentage + References No definition available. + Details
Name: | oge_SettlementofReturnonEquityPercentage
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's approved debt to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedDebtCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's approved equity to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedEquityCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's interim rate increase (decrease) allowed while waiting final decision of regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesInterimRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period end amount of construction work in progress in public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of public utility's requested equity to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=oge_AdministrativeLawJudgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=oge_OklahomaCorporationCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=oge_ArkansasPublicServiceCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=oge_FederalEnergyRegulatoryCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=oge_DryScrubberProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=oge_MustangModernizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_EntityByLocationAxis=stpr_OK
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_EntityByLocationAxis=stpr_AR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=oge_OklahomaDemandProgramRiderUnderRecoveryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | oge_RegulatoryFileDateAxis=oge_January162018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=oge_FERCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |