Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Revenues:
Electric revenues	$ 133,090	$ 121,853	$ 355,381	$ 324,574
Gas revenue	30,310	24,020	169,305	119,944
Total Operating Revenues	163,400	145,873	524,686	444,518
Operating Expenses:
Fuel for electric generation	21,045	18,486	48,410	42,570
Purchased power	9,593	8,646	35,757	28,914
Cost of gas sold	14,523	8,780	100,638	57,728
Other operations and maintenance	49,194	48,494	150,714	144,563
Depreciation and amortization	21,447	18,991	63,780	55,968
Other general taxes	5,111	4,878	15,579	14,730
Total Operating Expenses	120,913	108,275	414,878	344,473
Operating Income	42,487	37,598	109,808	100,045
Other income, net	6,068	6,164	20,736	14,353
Interest expense, net	(6,652)	(6,079)	(19,686)	(17,591)
Income before income taxes	41,903	37,683	110,858	96,807
Income tax provision	(8,183)	(2,766)	(20,957)	(4,106)
Net Income Including Noncontrolling Interest	33,720	34,917	89,901	92,701
Net Income	$ 33,720	$ 34,917	$ 89,901	$ 92,701
Earnings per share of Common Stock - Basic	$ 0.93	$ 0.97	$ 2.49	$ 2.56
Earnings per share of Common Stock - Diluted	0.93	0.97	2.49	2.56
Dividends per share of common stock	$ 0.408	$ 0.388	$ 1.183	$ 1.128
Weighted Average Number of Shares Outstanding, Basic	36,163	36,163	36,163	36,163
Weighted Average Shares Outstanding - Diluted	36,176	36,170	36,174	36,176
MGE [Member]
Operating Revenues:
Electric revenues	$ 133,090	$ 121,853	$ 355,381	$ 324,574
Gas revenue	30,310	24,020	169,305	119,944
Total Operating Revenues	163,400	145,873	524,686	444,518
Operating Expenses:
Fuel for electric generation	21,045	18,486	48,410	42,570
Purchased power	9,593	8,646	35,757	28,914
Cost of gas sold	14,523	8,780	100,638	57,728
Other operations and maintenance	48,989	48,315	150,024	143,978
Depreciation and amortization	21,447	18,991	63,780	55,968
Other general taxes	5,106	4,878	15,573	14,730
Total Operating Expenses	120,703	108,096	414,182	343,888
Operating Income	42,697	37,777	110,504	100,630
Other income, net	4,430	3,306	12,467	6,375
Interest expense, net	(6,662)	(6,089)	(19,709)	(17,623)
Income before income taxes	40,465	34,994	103,262	89,382
Income tax provision	(7,664)	(1,993)	(18,781)	(1,853)
Net Income Including Noncontrolling Interest	32,801	33,001	84,481	87,529
Less Net Income Attributable to Noncontrolling Interest, net of tax	(5,603)	(5,627)	(15,947)	(16,755)
Net Income	$ 27,198	$ 27,374	$ 68,534	$ 70,774