Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Revenues:
Electric revenues	$ 408,980	$ 402,001	$ 414,274
Gas revenues	159,875	157,767	148,825
Total Operating Revenues	568,855	559,768	563,099
Operating Expenses:
Fuel for electric generation	51,954	56,141	53,029
Purchased power	41,474	50,807	58,690
Cost of gas sold	79,775	84,968	76,644
Other operations and maintenance	193,322	177,823	177,740
Depreciation and amortization	71,562	56,412	53,077
Other general taxes	19,858	19,410	19,294
Total Operating Expenses	457,945	445,561	438,474
Operating Income (Loss)	110,910	114,207	124,625
Other income, net	18,811	17,055	14,399
Interest expense, net	(23,063)	(19,609)	(19,324)
Income before income taxes	106,658	111,653	119,700
Income tax provision	(19,784)	(27,434)	(22,094)	[1]
Net Income Including Noncontrolling Interest	86,874	84,219	97,606
Net Income	$ 86,874	$ 84,219	$ 97,606
Earnings Per Share of Common Stock (basic and diluted)	$ 2.51	$ 2.43	$ 2.82
Dividends per share of common stock	$ 1.38	$ 1.32	$ 1.26
Weighted Average Shares Outstanding (basic and diluted)	34,668	34,668	34,668
MGE [Member]
Operating Revenues:
Electric revenues	$ 408,980	$ 402,001	$ 414,277
Gas revenues	159,875	157,767	148,834
Total Operating Revenues	568,855	559,768	563,111
Operating Expenses:
Fuel for electric generation	51,954	56,141	53,031
Purchased power	41,474	50,807	58,692
Cost of gas sold	79,775	84,968	76,652
Other operations and maintenance	192,440	176,762	176,729
Depreciation and amortization	71,562	56,412	53,077
Other general taxes	19,858	19,410	19,294
Total Operating Expenses	457,063	444,500	437,475
Operating Income (Loss)	111,792	115,268	125,636
Other income, net	10,703	10,426	6,450
Interest expense, net	(24,298)	(21,197)	(20,024)
Income before income taxes	98,197	104,497	112,062
Income tax provision	(17,418)	(25,461)	(18,990)	[2]
Net Income Including Noncontrolling Interest	80,779	79,036	93,072
Less Net Income Attributable to Noncontrolling Interest, net of tax	(22,349)	(22,552)	(43,237)
Net Income	$ 58,430	$ 56,484	$ 49,835

[1] In December 2017, there was a $21.7 million one-time tax impact as a result of the Tax Act.

[2] In December 2017, there was a $21.7 million one-time tax impact as a result of the Tax Act.