MGE Energy Inc Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Operating Revenues:
Electric revenues	$ 414,274		$ 410,202	$ 420,291
Gas revenues	148,825		134,543	143,737
Total Operating Revenues	563,099		544,745	564,028
Operating Expenses:
Fuel for electric generation	53,029		60,736	53,858
Purchased power	58,690		56,313	81,224
Cost of gas sold	76,644		66,771	76,109
Other operations and maintenance	173,629		167,989	164,478
Depreciation and amortization	53,077		44,646	44,225
Other general taxes	19,294		20,062	19,879
Total Operating Expenses	434,363		416,517	439,773
Operating Income (Loss)	128,736		128,228	124,255
Other income, net	10,288		9,711	8,613
Interest expense, net	(19,324)		(19,866)	(20,162)
Income before income taxes	119,700		118,073	112,706
Income tax provision	(22,094)	[1]	(42,513)	(41,363)
Net Income	$ 97,606		$ 75,560	$ 71,343
Earnings Per Share of Common Stock (basic and diluted)	$ 2.82		$ 2.18	$ 2.06
Dividends per share of common stock	$ 1.26		$ 1.21	$ 1.16
Weighted Average Shares Outstanding (basic and diluted)	34,668		34,668	34,668

[1] In December 2017, there was a $21.7 million one-time tax impact as a result of the Tax Act. See Footnote 12 for further information.