{"cik":61339,"taxonomy":"us-gaap","tag":"IncomeTaxExpenseBenefit","label":"Income Tax Expense (Benefit)","description":"Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.","entityName":"MGE Energy, Inc.","units":{"USD":[{"start":"2013-01-01","end":"2013-03-31","val":13678000,"accn":"0001161728-14-000011","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2013Q1"},{"start":"2014-01-01","end":"2014-03-31","val":16265000,"accn":"0001161728-14-000011","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1"},{"start":"2023-01-01","end":"2023-12-31","val":27803000,"accn":"0001193125-26-083622","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-02","frame":"CY2023"},{"start":"2024-01-01","end":"2024-12-31","val":10596000,"accn":"0001193125-26-083622","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-02","frame":"CY2024"},{"start":"2025-01-01","end":"2025-06-30","val":9271000,"accn":"0001193125-26-333969","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05"},{"start":"2025-04-01","end":"2025-06-30","val":2975000,"accn":"0001193125-26-333969","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05","frame":"CY2025Q2"},{"start":"2025-01-01","end":"2025-12-31","val":20765000,"accn":"0001193125-26-083622","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-02","frame":"CY2025"},{"start":"2026-01-01","end":"2026-06-30","val":10135000,"accn":"0001193125-26-333969","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05"},{"start":"2026-04-01","end":"2026-06-30","val":4279000,"accn":"0001193125-26-333969","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05","frame":"CY2026Q2"}]}}