Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant, and Equipment

Property, plant, and equipment consisted of the following at December 31:

		MGE Energy				MGE
(In thousands)		2016		2015		2016		2015
Utility:
Electric(a)	$	1,171,004	$	1,147,701	$	1,171,021	$	1,147,718
Gas		395,790		384,163		395,801		384,175
Total utility plant		1,566,794		1,531,864		1,566,822		1,531,893
Less: Accumulated depreciation and amortization(a)		579,965		578,410		579,965		578,410
In-service utility plant, net		986,829		953,454		986,857		953,483
Nonregulated:
Nonregulated		317,810		315,589		317,014		314,750
Less: Accumulated depreciation and amortization		59,370		51,949		59,223		51,818
In-service nonregulated plant, net		258,440		263,640		257,791		262,932
Construction work in progress:
Utility construction work in progress(a)		31,356		23,837		31,356		23,837
Nonregulated construction work in progress		5,434		2,514		5,434		2,514
Total property, plant, and equipment	$	1,282,059	$	1,243,445	$	1,281,438	$	1,242,766

(a)As of December 31,2016, MGE has classified $14.8 million of Columbia assets as held-for-sale on the consolidated balance sheets related to the partial sale of plant assets to WPL. See Footnote 5.a. for further discussion.