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Rate Matters and Regulation Rate Matters and Regulation (Details) $ in Millions | 9 Months Ended
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Sep. 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%
Increase (Decrease) in Regulatory Clause Revenue | $ 424.0
Grid Enhancement |
Public Utilities, Requested Rate Increase (Decrease), Amount | 6.0
Maximum [Member] |
Lost Revenue on Plant Investments for Customers | 58.0
Minimum [Member] |
Lost Revenue on Plant Investments for Customers | 17.4
In Favor Cooperatives |
Plan Investments for Customers | 11.7
In Favor Cooperatives | Maximum [Member] |
Lost Revenues on Plant Investments for Customers | 7.0
In Favor Cooperatives | Minimum [Member] |
Lost Revenues on Plant Investments for Customers | 4.1
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
Public Utilities, Approved Rate Increase (Decrease), Amount | 8.5
Impact to Company [Member] |
Estimated Refund to SPP | 5.0
Customer Impact [Member] |
Estimated Refund to SPP | $ 8.0

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- Definition The increase (decrease) during the reporting period in unrecovered fuel costs for a regulated utility company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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