Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Revenues:
Electric revenues	$ 100,645	$ 93,028
Gas revenue	67,270	56,845
Total Operating Revenues	167,915	149,873
Operating Expenses:
Fuel for electric generation	13,171	9,706
Purchased power	9,355	10,486
Cost of gas sold	37,444	30,798
Other operations and maintenance	45,682	44,369
Depreciation and amortization	18,382	18,167
Other general taxes	4,827	4,907
Total Operating Expenses	128,861	118,433
Operating Income	39,054	31,440
Other (expense) income, net	2,078	5,671
Interest expense, net	(5,740)	(6,061)
Income before income taxes	35,392	31,050
Income tax benefit (provision)	(459)	(5,013)
Net Income Including Noncontrolling Interest	34,933	26,037
Net Income	$ 34,933	$ 26,037
Earnings per share of Common Stock - Basic	$ 0.97	$ 0.75
Earnings per share of Common Stock - Diluted	0.97	0.75
Dividends per share of common stock	$ 0.370	$ 0.353
Weighted Average Number Of Shares Outstanding Basic	36,163	34,668
Weighted Average Shares Outstanding - Diluted	36,165	34,668
MGE [Member]
Operating Revenues:
Electric revenues	$ 100,645	$ 93,028
Gas revenue	67,270	56,845
Total Operating Revenues	167,915	149,873
Operating Expenses:
Fuel for electric generation	13,171	9,706
Purchased power	9,355	10,486
Cost of gas sold	37,444	30,798
Other operations and maintenance	45,538	44,150
Depreciation and amortization	18,382	18,167
Other general taxes	4,827	4,907
Total Operating Expenses	128,717	118,214
Operating Income	39,198	31,659
Other (expense) income, net	(104)	3,380
Interest expense, net	(5,753)	(6,111)
Income before income taxes	33,341	28,928
Income tax benefit (provision)	433	(4,371)
Net Income Including Noncontrolling Interest	33,774	24,557
Less Net Income Attributable to Noncontrolling Interest, net of tax	(5,501)	(5,493)
Net Income	$ 28,273	$ 19,064