Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Revenues:
Electric revenues	$ 120,597	$ 121,707	$ 236,764	$ 238,998
Gas revenue	25,116	26,291	100,285	126,253
Total Operating Revenues	145,713	147,998	337,049	365,251
Operating Expenses:
Fuel for electric generation	11,237	13,599	23,941	27,406
Purchased power	8,850	5,845	18,292	21,231
Cost of gas sold	6,293	7,289	48,170	75,136
Other operations and maintenance	56,730	52,049	110,704	102,007
Depreciation and amortization	26,932	25,119	53,532	49,730
Other general taxes	5,936	5,707	11,930	11,317
Total Operating Expenses	115,978	109,608	266,569	286,827
Operating Income	29,735	38,390	70,480	78,424
Other income, net	3,856	4,937	7,737	10,292
Interest expense, net	(8,325)	(7,760)	(16,329)	(15,247)
Income before income taxes	25,266	35,567	61,888	73,469
Income tax provision	(1,472)	(6,886)	(4,280)	(13,710)
Net Income Including Noncontrolling Interest	23,794	28,681	57,608	59,759
Net Income	$ 23,794	$ 28,681	$ 57,608	$ 59,759
Earnings per share of Common Stock - Basic	$ 0.66	$ 0.79	$ 1.59	$ 1.65
Earnings per share of Common Stock - Diluted	0.66	0.79	1.59	1.65
Dividends per share of common stock	$ 0.428	$ 0.408	$ 0.855	$ 0.815
Weighted Average Shares Outstanding - Basic	36,176	36,163	36,173	36,163
Weighted Average Shares Outstanding - Diluted	36,197	36,186	36,196	36,183
MGE [Member]
Operating Revenues:
Electric revenues	$ 120,597	$ 121,707	$ 236,764	$ 238,998
Gas revenue	25,116	26,291	100,285	126,253
Total Operating Revenues	145,713	147,998	337,049	365,251
Operating Expenses:
Fuel for electric generation	11,237	13,599	23,941	27,406
Purchased power	8,850	5,845	18,292	21,231
Cost of gas sold	6,293	7,289	48,170	75,136
Other operations and maintenance	56,601	51,835	110,161	101,404
Depreciation and amortization	26,932	25,119	53,532	49,730
Other general taxes	5,936	5,707	11,930	11,317
Total Operating Expenses	115,849	109,394	266,026	286,224
Operating Income	29,864	38,604	71,023	79,027
Other income, net	1,134	3,254	2,242	6,161
Interest expense, net	(8,433)	(7,815)	(16,509)	(15,335)
Income before income taxes	22,565	34,043	56,756	69,853
Income tax provision	(811)	(6,436)	(2,802)	(12,603)
Net Income Including Noncontrolling Interest	21,754	27,607	53,954	57,250
Less Net Income Attributable to Noncontrolling Interest, net of tax	(5,766)	(5,375)	(11,363)	(10,895)
Net Income	$ 15,988	$ 22,232	$ 42,591	$ 46,355