Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Electric revenues	$ 112,164	$ 102,076	$ 222,291	$ 202,721
Gas revenue	40,184	28,654	138,995	95,924
Total Operating Revenues	152,348	130,730	361,286	298,645
Operating Expenses:
Fuel for electric generation	13,880	10,913	27,365	24,084
Purchased power	13,621	10,913	26,164	20,268
Cost of gas sold	21,313	11,504	86,115	48,948
Other operations and maintenance	51,526	50,387	101,520	96,069
Depreciation and amortization	21,287	18,595	42,333	36,977
Other general taxes	5,263	5,025	10,468	9,852
Total Operating Expenses	126,890	107,337	293,965	236,198
Operating Income	25,458	23,393	67,321	62,447
Other (expense) income, net	7,696	6,110	14,668	8,188
Interest expense, net	(6,463)	(5,771)	(13,034)	(11,511)
Income before income taxes	26,691	23,732	68,955	59,124
Income tax (provision) benefit	(4,930)	(881)	(12,774)	(1,340)
Net Income Including Noncontrolling Interest	21,761	22,851	56,181	57,784
Net Income	$ 21,761	$ 22,851	$ 56,181	$ 57,784
Earnings per share of Common Stock - Basic	$ 0.60	$ 0.63	$ 1.55	$ 1.60
Earnings per share of Common Stock - Diluted	0.60	0.63	1.55	1.60
Dividends per share of common stock	$ 0.388	$ 0.370	$ 0.775	$ 0.740
Weighted Average Number of Shares Outstanding, Basic	36,163	36,163	36,163	36,163
Weighted Average Shares Outstanding - Diluted	36,174	36,168	36,173	36,170
MGE [Member]
Operating Revenues:
Electric revenues	$ 112,164	$ 102,076	$ 222,291	$ 202,721
Gas revenue	40,184	28,654	138,995	95,924
Total Operating Revenues	152,348	130,730	361,286	298,645
Operating Expenses:
Fuel for electric generation	13,880	10,913	27,365	24,084
Purchased power	13,621	10,913	26,164	20,268
Cost of gas sold	21,313	11,504	86,115	48,948
Other operations and maintenance	51,289	50,125	101,034	95,663
Depreciation and amortization	21,287	18,595	42,333	36,977
Other general taxes	5,263	5,025	10,468	9,852
Total Operating Expenses	126,653	107,075	293,479	235,792
Operating Income	25,695	23,655	67,807	62,853
Other (expense) income, net	4,519	3,173	8,037	3,069
Interest expense, net	(6,470)	(5,781)	(13,047)	(11,534)
Income before income taxes	23,744	21,047	62,797	54,388
Income tax (provision) benefit	(4,117)	(293)	(11,117)	140
Net Income Including Noncontrolling Interest	19,627	20,754	51,680	54,528
Less Net Income Attributable to Noncontrolling Interest, net of tax	(5,588)	(5,627)	(10,344)	(11,128)
Net Income	$ 14,039	$ 15,127	$ 41,336	$ 43,400