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Rate Matters and Regulation Rate Matters and Regulation (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Estimated Refund to SPP | $ 13.0 |
Fuel clause under recoveries | 98.2 | $ 0.0
Plan Investments for Customers | 28.0 |
Regulatory assets | 1,264.9 | 415.6
Securitization Authorization Requested | 760.0 |
Securitization Fuel Purchase Request | 748.9 |
Securitization Fuel Cost Request Prudency | 739.1 |
Grid Enhancement |  |
Revenue Requirement | 7.0 |
Minimum [Member] |  |
Lost Revenues on Plant Investments for Customers | 26.0 |
Maximum [Member] |  |
Lost Revenues on Plant Investments for Customers | 35.4 |
In Favor Cooperatives |  |
Plan Investments for Customers | 11.7 |
In Favor Cooperatives | Minimum [Member] |  |
Lost Revenues on Plant Investments for Customers | 2.5 |
In Favor Cooperatives | Maximum [Member] |  |
Lost Revenues on Plant Investments for Customers | 3.9 |
ARKANSAS |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | 6.4 |
Public Utilities, Approved Rate Increase (Decrease), Amount | 6.7 |
ARKANSAS | Extreme Cold Weather Costs |  |
Regulatory assets | 91.0 | $ 0.0
Impact to Company [Member] |  |
Estimated Refund to SPP | 5.0 |
Customer Impact [Member] |  |
Estimated Refund to SPP | $ 8.0 |

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