Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues:
Electric revenues	$ 498,357	$ 490,419	$ 465,847
Gas revenue	178,587	200,012	248,672
Total Operating Revenues	676,944	690,431	714,519
Operating Expenses:
Fuel for electric generation	53,994	57,627	61,329
Purchased power	32,852	41,224	46,821
Cost of gas sold	82,693	106,647	152,570
Other operations and maintenance	228,576	215,891	209,875
Depreciation and amortization	108,581	100,352	85,549
Other general taxes	23,986	22,305	20,632
Total Operating Expenses	530,682	544,046	576,776
Operating Income	146,262	146,385	137,743
Other income, net	17,833	29,546	26,080
Interest (expense) income, net	(32,930)	(30,429)	(26,647)
Income before income taxes	131,165	145,502	137,176
Income tax provision	(10,596)	(27,803)	(26,224)
Net Income Including Noncontrolling Interest	120,569	117,699	110,952
Net Income	$ 120,569	$ 117,699	$ 110,952
Earnings Per Share of Common Stock, Basic	$ 3.33	$ 3.25	$ 3.07
Earnings Per Share of Common Stock, Diluted	3.33	3.25	3.07
Dividends per share of common stock	$ 1.76	$ 1.67	$ 1.59
Weighted Average Shares Outstanding, Basic	36,210	36,163	36,163
Weighted Average Shares Outstanding, Diluted	36,239	36,186	36,174
MGE [Member]
Operating Revenues:
Electric revenues	$ 498,357	$ 490,419	$ 465,847
Gas revenue	178,587	200,012	248,672
Total Operating Revenues	676,944	690,431	714,519
Operating Expenses:
Fuel for electric generation	53,994	57,627	61,329
Purchased power	32,852	41,224	46,821
Cost of gas sold	82,693	106,647	152,570
Other operations and maintenance	227,671	214,897	209,007
Depreciation and amortization	108,581	100,352	85,549
Other general taxes	23,986	22,301	20,627
Total Operating Expenses	529,777	543,048	575,903
Operating Income	147,167	147,383	138,616
Other income, net	5,885	21,365	17,626
Interest (expense) income, net	(33,369)	(30,651)	(26,687)
Income before income taxes	119,683	138,097	129,555
Income tax provision	(7,384)	(25,727)	(24,063)
Net Income Including Noncontrolling Interest	112,299	112,370	105,492
Less Net Income Attributable to Noncontrolling Interest, net of tax	(22,855)	(21,868)	(21,576)
Net Income	$ 89,444	$ 90,502	$ 83,916