Property, Plant, and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant, and Equipment - MGE Energy and MGE.

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.

MGE's utility plant is subject to the lien of its Indenture of Mortgage and Deed of Trust. As of December 31,2016 and 2015, there was $1.2 million of bonds outstanding under that indenture. See Footnote 9 for further discussion of the mortgage indenture.