Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

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)		2013		2012		2013		2012
Utility:
Electric	$	953,290	$	912,273	$	953,307	$	912,289
Gas		351,694		332,767		351,705		332,779
Total utility plant		1,304,984		1,245,040		1,305,012		1,245,068
Less: Accumulated depreciation and amortization		560,066		546,483		560,066		546,483
In-service utility plant, net		744,918		698,557		744,946		698,585
Nonregulated:
Nonregulated		311,742		308,043		310,745		307,511
Less: Accumulated depreciation and amortization		37,851		31,547		37,814		31,547
In-service nonregulated plant, net		273,891		276,496		272,931		275,964
Construction work in progress:
Utility construction work in progress		140,301		96,863		140,301		96,863
Nonregulated construction work in progress		1,114		1,548		1,114		1,548
Total property, plant, and equipment	$	1,160,224	$	1,073,464	$	1,159,292	$	1,072,960