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v3.20.4

Rate Matters and Regulation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Estimated Refund to SPP | $ 13.0 |
Investment in Grid Enhancement | 800.0 |
Plant Investments For Customers | 28.0 |
Other Commitment | 1,000.0 |
Minimum [Member] |  |
Lost Revenue on Plant Investments for Customers | 14.5 |
Loss Contingency, Range of Possible Loss, Maximum | 800.0 |
Maximum [Member] |  |
Lost Revenue on Plant Investments for Customers | 21.7 |
Loss Contingency, Range of Possible Loss, Maximum | 1,000.0 |
In Favor Cooperatives [Member] |  |
Plant Investments For Customers | 11.7 |
In Favor Cooperatives [Member] | Minimum [Member] |  |
Lost Revenue on Plant Investments for Customers | 1.4 |
In Favor Cooperatives [Member] | Maximum [Member] |  |
Lost Revenue on Plant Investments for Customers | 2.3 |
Impact to Company [Member] |  |
Estimated Refund to SPP | 5.0 |
Customer Impact [Member] |  |
Estimated Refund to SPP | $ 8.0 |
Oklahoma Corporation Commission [Member] |  |
OG&E's Jurisdictional Revenues | 86.00% |
Arkansas Public Service Commission [Member] |  |
OG&E's Jurisdictional Revenues | 8.00% |
Federal Energy Regulatory Commission [Member] |  |
OG&E's Jurisdictional Revenues | 6.00% |
Arkansas Environmental [Member] |  |
Customer Refund Amount | $ 5.3 |
Grid Enhancement |  |
OCC Revenue Requirement | 7.0 |
ARKANSAS |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 6.7 | $ 5.2

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