Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating Revenues:
Electric revenues	$ 148,004	$ 139,104	$ 384,768	$ 378,102
Gas revenue	20,476	21,424	120,761	147,677
Total Operating Revenues	168,480	160,528	505,529	525,779
Operating Expenses:
Fuel for electric generation	17,252	19,712	41,193	47,118
Purchased power	8,127	7,021	26,419	28,252
Cost of gas sold	4,628	5,160	52,798	80,296
Other operations and maintenance	57,129	53,997	167,833	156,004
Depreciation and amortization	27,104	25,241	80,636	74,971
Other general taxes	6,100	5,605	18,030	16,922
Total Operating Expenses	120,340	116,736	386,909	403,563
Operating Income	48,140	43,792	118,620	122,216
Other income, net	4,839	10,549	12,576	20,841
Interest expense, net	(8,396)	(7,654)	(24,725)	(22,901)
Income before income taxes	44,583	46,687	106,471	120,156
Income tax provision	(3,644)	(8,830)	(7,924)	(22,540)
Net Income Including Noncontrolling Interest	40,939	37,857	98,547	97,616
Net Income	$ 40,939	$ 37,857	$ 98,547	$ 97,616
Earnings per share of Common Stock - Basic	$ 1.13	$ 1.05	$ 2.72	$ 2.7
Earnings per share of Common Stock - Diluted	1.13	1.05	2.72	2.7
Dividends per share of common stock	$ 0.45	$ 0.428	$ 1.305	$ 1.243
Weighted Average Shares Outstanding - Basic	36,181	36,163	36,176	36,163
Weighted Average Shares Outstanding - Diluted	36,211	36,189	36,202	36,185
MGE [Member]
Operating Revenues:
Electric revenues	$ 148,004	$ 139,104	$ 384,768	$ 378,102
Gas revenue	20,476	21,424	120,761	147,677
Total Operating Revenues	168,480	160,528	505,529	525,779
Operating Expenses:
Fuel for electric generation	17,252	19,712	41,193	47,118
Purchased power	8,127	7,021	26,419	28,252
Cost of gas sold	4,628	5,160	52,798	80,296
Other operations and maintenance	56,937	53,847	167,098	155,251
Depreciation and amortization	27,104	25,241	80,636	74,971
Other general taxes	6,100	5,605	18,030	16,922
Total Operating Expenses	120,148	116,586	386,174	402,810
Operating Income	48,332	43,942	119,355	122,969
Other income, net	2,025	7,824	4,267	13,985
Interest expense, net	(8,527)	(7,721)	(25,036)	(23,056)
Income before income taxes	41,830	44,045	98,586	113,898
Income tax provision	(2,720)	(8,093)	(5,522)	(20,696)
Net Income Including Noncontrolling Interest	39,110	35,952	93,064	93,202
Less Net Income Attributable to Noncontrolling Interest, net of tax	(5,777)	(5,487)	(17,140)	(16,382)
Net Income	$ 33,333	$ 30,465	$ 75,924	$ 76,820