0001161728 2026-06-19 2026-06-19 0001161728 mgee:MgeMember 2026-06-19 2026-06-19 0000061339 0001161728 false false 8-K 2026-06-19 000-49965 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 Common Stock, $1 Par Value Per Share MGEE NASDAQ false false