Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Schedule II
MGE Energy, Inc. and Madison Gas and Electric Company
Valuation and Qualifying Accounts
			Additions
		Balance at Beginning of Period	Charged to Costs and Expenses	Charged toOther Accounts	Net Accounts Written Off(a)		Balance at End of Period
Fiscal Year 2015:
Accumulated provision for uncollectibles	$	4,748,657	595,500	25,500	(1,675,577)	$	3,694,080
Fiscal Year 2016:
Accumulated provision for uncollectibles	$	3,694,080	1,195,500	19,500	(1,465,784)	$	3,443,296
Fiscal Year 2017:
Accumulated provision for uncollectibles	$	3,443,296	1,015,970	20,400	(1,304,721)	$	3,174,945
(a) Net of recovery of amounts previously written off.