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Rate Matters and Regulation Rate Matters and Regulation (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2022 USD ($)
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 30.0
Estimated Refund to SPP | 13.0
Plan Investments for Customers | $ 28.0
Common Equity Percentage which ROE is based | 53.37%
Requested Recovery of Capital Investment | $ 1,200.0
Securitization Authorization Requested | 760.0
Securitization Authorization Granted | $ 750.0
Public Utilities, Approved Return on Equity, Percentage | 9.50%
Grid Enhancement |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 6.0
Maximum [Member] |
Lost Revenue on Plant Investments for Customers | 48.3
Minimum [Member] |
Lost Revenue on Plant Investments for Customers | 35.6
In Favor Cooperatives |
Plan Investments for Customers | 11.7
In Favor Cooperatives | Maximum [Member] |
Lost Revenues on Plant Investments for Customers | 5.9
In Favor Cooperatives | Minimum [Member] |
Lost Revenues on Plant Investments for Customers | 3.5
OKLAHOMA |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 163.5
Public Utilities, Requested Return on Equity, Percentage | 10.20%
Common Equity Percentage which ROE is based | 53.37%
ARKANSAS |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 4.2
Impact to Company [Member] |
Estimated Refund to SPP | 5.0
Customer Impact [Member] |
Estimated Refund to SPP | $ 8.0

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