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v3.19.1

Rate Matters and Regulation Rate Matters and Regulation (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Public Utilities, Amount Requested for Acquisition | $ 53.5
Estimated Refund to SPP | 21.0
Dry Scrubber Project [Member] |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 511.3
Muskogee Natural Gas Conversion [Member] |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 56.2
OKLAHOMA |
Public Utilities, Requested Rate Increase (Decrease), Amount | 77.6
ARKANSAS |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 3.3
FERC [Member] |
Public Utilities, Approved Return on Equity, Percentage | 10.60%
Recommended Common Equity Percentage | 7.85%
Impact to Company [Member] |
Estimated Refund to SPP | $ 5.5
Customer Impact [Member] |
Estimated Refund to SPP | $ 15.5

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