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Commitments and Contingencies (Details-2) - Coal [Member]
$ in Thousands
Mar. 31, 2023
USD ($)
[1]
Operating expense purchase contracts [Abstract]  
Purchase obligation, 2023 $ 22,125
Purchase obligation, 2024 21,460
Purchase obligation, 2025 12,049
Purchase obligation, 2026 2,868
Purchase obligation, 2027 0
Purchase obligation, Thereafter $ 0
[1] Total coal commitments for MGE's share of 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.