Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Operating Revenues:
Electric revenues	$ 129,527	$ 120,597	$ 255,016	$ 236,764
Gas revenue	29,925	25,116	123,406	100,285
Total Operating Revenues	159,452	145,713	378,422	337,049
Operating Expenses:
Fuel for electric generation	16,292	11,237	33,861	23,941
Purchased power	5,562	8,850	9,940	18,292
Cost of gas sold	11,313	6,293	65,277	48,170
Other operations and maintenance	57,777	56,730	114,336	110,704
Depreciation and amortization	28,354	26,932	56,032	53,532
Other general taxes	5,931	5,936	11,888	11,930
Total Operating Expenses	125,229	115,978	291,334	266,569
Operating Income	34,223	29,735	87,088	70,480
Other income, net	3,707	3,856	6,311	7,737
Interest expense, net	(8,457)	(8,325)	(16,038)	(16,329)
Income before income taxes	29,473	25,266	77,361	61,888
Income tax provision	(2,975)	(1,472)	(9,271)	(4,280)
Net Income Including Noncontrolling Interest	26,498	23,794	68,090	57,608
Net Income	$ 26,498	$ 23,794	$ 68,090	$ 57,608
Earnings per share of Common Stock - Basic	$ 0.73	$ 0.66	$ 1.86	$ 1.59
Earnings per share of Common Stock - Diluted	0.72	0.66	1.86	1.59
Dividends per share of common stock	$ 0.45	$ 0.428	$ 0.9	$ 0.855
Weighted Average Shares Outstanding - Basic	36,540	36,176	36,526	36,173
Weighted Average Shares Outstanding - Diluted	36,569	36,197	36,557	36,196
MGE [Member]
Operating Revenues:
Electric revenues	$ 129,527	$ 120,597	$ 255,016	$ 236,764
Gas revenue	29,925	25,116	123,406	100,285
Total Operating Revenues	159,452	145,713	378,422	337,049
Operating Expenses:
Fuel for electric generation	16,292	11,237	33,861	23,941
Purchased power	5,562	8,850	9,940	18,292
Cost of gas sold	11,313	6,293	65,277	48,170
Other operations and maintenance	57,489	56,601	113,751	110,161
Depreciation and amortization	28,354	26,932	56,032	53,532
Other general taxes	5,931	5,936	11,888	11,930
Total Operating Expenses	124,941	115,849	290,749	266,026
Operating Income	34,511	29,864	87,673	71,023
Other income, net	747	1,134	363	2,242
Interest expense, net	(8,554)	(8,433)	(16,189)	(16,509)
Income before income taxes	26,704	22,565	71,847	56,756
Income tax provision	(2,229)	(811)	(7,569)	(2,802)
Net Income Including Noncontrolling Interest	24,475	21,754	64,278	53,954
Less Net Income Attributable to Noncontrolling Interest, net of tax	(5,714)	(5,766)	(11,313)	(11,363)
Net Income	$ 18,761	$ 15,988	$ 52,965	$ 42,591