Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2014

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)		2014		2013		2014		2013
Utility:
Electric	$	1,110,953	$	953,290	$	1,110,970	$	953,307
Gas		369,975		351,694		369,987		351,705
Total utility plant		1,480,928		1,304,984		1,480,957		1,305,012
Less: Accumulated depreciation and amortization		559,615		560,066		559,615		560,066
In-service utility plant, net		921,313		744,918		921,342		744,946
Nonregulated:
Nonregulated		313,152		311,742		312,314		310,745
Less: Accumulated depreciation and amortization		45,388		37,851		45,305		37,814
In-service nonregulated plant, net		267,764		273,891		267,009		272,931
Construction work in progress:
Utility construction work in progress		16,988		140,301		16,988		140,301
Nonregulated construction work in progress		2,041		1,114		2,041		1,114
Total property, plant, and equipment	$	1,208,106	$	1,160,224	$	1,207,380	$	1,159,292