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v3.21.1

Rate Matters and Regulation Rate Matters and Regulation (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Estimated Refund to SPP | $ 13.0 |
Fuel clause under recoveries | 91.8 | $ 0.0
Plan Investments for Customers | 28.0 |
Regulatory assets | 1,269.7 | 415.6
Minimum [Member] |  |
Lost Revenues on Plant Investments for Customers | 20.1 |
Maximum [Member] |  |
Lost Revenues on Plant Investments for Customers | 27.8 |
In Favor Cooperatives |  |
Plan Investments for Customers | 11.7 |
In Favor Cooperatives | Minimum [Member] |  |
Lost Revenues on Plant Investments for Customers | 1.8 |
In Favor Cooperatives | Maximum [Member] |  |
Lost Revenues on Plant Investments for Customers | 2.8 |
Grid Enhancement |  |
OCC Revenue Requirement | 7.0 |
Extreme Cold Weather Costs |  |
Fuel clause under recoveries | 102.4 |
Regulatory assets | 829.4 | $ 0.0
ARKANSAS |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | 6.7 |
Impact to Company [Member] |  |
Estimated Refund to SPP | 5.0 |
Customer Impact [Member] |  |
Estimated Refund to SPP | $ 8.0 |

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