Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property, Plant, And Equipment (Tables) [Abstract]

Property, Plant, and Equipment

		MGE Energy				MGE
(In thousands)		2011		2010		2011		2010
Utility:
Electric	$	886,589	$	841,256	$	886,606	$	841,273
Gas		319,502		304,117		319,513		304,129
Total utility plant		1,206,091		1,145,373		1,206,119		1,145,402
Less: Accumulated depreciation and amortization		526,308		502,184		526,308		502,184
In-service utility plant, net		679,783		643,189		679,811		643,218
Nonregulated:
Nonregulated		307,182		232,754		306,650		232,595
Less: Accumulated depreciation and amortization		25,454		18,371		25,454		18,371
In-service nonregulated plant, net		281,728		214,383		281,196		214,224
Construction work in progress:
Utility construction work in progress		33,218		38,214		33,218		38,214
Nonregulated construction work in progress		837		72,221		837		72,221
Total property, plant, and equipment	$	995,566	$	968,007	$	995,062	$	967,877