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Commitments and Contingencies (Details-2) - Coal [Member]
$ in Thousands
Mar. 31, 2022
USD ($)
[1]
Operating expense purchase contracts [Abstract]  
Purchase obligation, 2022 $ 17,825
Purchase obligation, 2023 14,023
Purchase obligation, 2024 8,299
Purchase obligation, 2025 2,862
Purchase obligation, 2026 0
Purchase obligation, Thereafter $ 0
[1] Total coal commitments for the Columbia and Elm Road Units, including transportation. Fuel procurement for MGE's jointly owned Columbia and Elm Road Units is handled by WPL and WEPCO, respectively, who are the operators of those facilities.