0001161728 mgee:MgeMember 2022-05-05 2022-05-05 0001161728 2022-05-05 2022-05-05 0000061339 0001161728 false false 8-K 2022-05-05 000-49965 MGE Energy, Inc. WI 133 South Blair Street Madison WI 53788 608 252-7000 39-2040501 000-1125 Madison Gas and Electric Company WI 133 South Blair Street Madison WI 53788 608 252-7000 39-0444025 false false false false false false Common Stock, $1 Par Value Per Share MGEE NASDAQ