Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating Revenues:
Electric revenues	$ 155,491	$ 148,004	$ 410,507	$ 384,768
Gas revenue	20,188	20,476	143,594	120,761
Total Operating Revenues	175,679	168,480	554,101	505,529
Operating Expenses:
Fuel for electric generation	22,189	17,252	56,050	41,193
Purchased power	4,289	8,127	14,229	26,419
Cost of gas sold	4,865	4,628	70,142	52,798
Other operations and maintenance	58,325	57,129	172,661	167,833
Depreciation and amortization	28,816	27,104	84,848	80,636
Other general taxes	6,120	6,100	18,008	18,030
Total Operating Expenses	124,604	120,340	415,938	386,909
Operating Income	51,075	48,140	138,163	118,620
Other income, net	9,888	4,839	16,199	12,576
Interest expense, net	(8,677)	(8,396)	(24,715)	(24,725)
Income before income taxes	52,286	44,583	129,647	106,471
Income tax provision	(7,789)	(3,644)	(17,060)	(7,924)
Net Income Including Noncontrolling Interest	44,497	40,939	112,587	98,547
Net Income	$ 44,497	$ 40,939	$ 112,587	$ 98,547
Earnings per share of Common Stock - Basic	$ 1.22	$ 1.13	$ 3.08	$ 2.72
Earnings per share of Common Stock - Diluted	1.22	1.13	3.08	2.72
Dividends per share of common stock	$ 0.475	$ 0.45	$ 1.375	$ 1.305
Weighted Average Shares Outstanding - Basic	36,542	36,181	36,531	36,176
Weighted Average Shares Outstanding - Diluted	36,576	36,211	36,565	36,202
MGE [Member]
Operating Revenues:
Electric revenues	$ 155,491	$ 148,004	$ 410,507	$ 384,768
Gas revenue	20,188	20,476	143,594	120,761
Total Operating Revenues	175,679	168,480	554,101	505,529
Operating Expenses:
Fuel for electric generation	22,189	17,252	56,050	41,193
Purchased power	4,289	8,127	14,229	26,419
Cost of gas sold	4,865	4,628	70,142	52,798
Other operations and maintenance	58,096	56,937	171,847	167,098
Depreciation and amortization	28,816	27,104	84,848	80,636
Other general taxes	6,120	6,100	18,008	18,030
Total Operating Expenses	124,375	120,148	415,124	386,174
Operating Income	51,304	48,332	138,977	119,355
Other income, net	3,393	2,025	3,756	4,267
Interest expense, net	(8,702)	(8,527)	(24,891)	(25,036)
Income before income taxes	45,995	41,830	117,842	98,586
Income tax provision	(6,236)	(2,720)	(13,805)	(5,522)
Net Income Including Noncontrolling Interest	39,759	39,110	104,037	93,064
Less Net Income Attributable to Noncontrolling Interest, net of tax	(5,668)	(5,777)	(16,981)	(17,140)
Net Income	$ 34,091	$ 33,333	$ 87,056	$ 75,924