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Quarterly Summary of Operations
12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Summary of Operations

Quarterly Summary of Operations - MGE Energy (unaudited).

(In thousands, except per share amounts)Quarters Ended
2016March 31June 30September 30December 31
Operating revenues:
Electric revenues$93,690$100,615$119,147$96,750
Gas revenues53,83720,96117,57042,175
Total Operating Revenues147,527121,576136,717138,925
Operating expenses117,99693,36490,190114,967
Operating income29,53128,21246,52723,958
Interest and other income, net(2,558)(2,778)(2,933)(1,886)
Income tax provision(9,945)(9,284)(15,714)(7,570)
Earnings on common stock$17,028$16,150$27,880$14,502
Earnings per common share$0.49$0.47$0.80$0.42
Dividends per share$0.295$0.295$0.308$0.308
2015
Operating revenues:
Electric revenues$100,206$101,457$123,364$95,264
Gas revenues69,92820,66917,43135,709
Total Operating Revenues170,134122,126140,795130,973
Operating expenses138,28398,07794,618108,795
Operating income31,85124,04946,17722,178
Interest and other income, net(2,986)(2,562)(2,472)(3,529)
Income tax provision(10,587)(8,008)(15,351)(7,417)
Earnings on common stock$18,278$13,479$28,354$11,232
Earnings per common share$0.53$0.39$0.82$0.32
Dividends per share$0.283$0.283$0.295$0.295

Notes:

The quarterly results of operations within a year may not be comparable because of seasonal and other factors.

The sum of earnings per share of common stock for any four quarters may vary slightly from the earnings per share of common stock for the equivalent twelve-month period due to rounding.

MGE Energy's operations are based primarily on its utility subsidiary MGE.