Joint Plant Ownership (Tables)

12 Months Ended

Dec. 31, 2018

Columbia Units [Member]

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Joint Plant Ownership

MGE's interest in Columbia's gross utility plant in service, and the related accumulated depreciation reserves as of December 31 were as follows:

(In thousands)		2018		2017
Utility plant	$	292,157	$	274,450
Accumulated depreciation		(94,766)		(87,144)
Property, plant, and equipment, net		197,391		187,306
Construction work in progress		2,021		20,382
Total property, plant, and equipment	$	199,412	$	207,688

Elm Road Units [Member]

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Joint Plant Ownership

MGE Power Elm Road's interest in the portion of the Elm Road Units in-service and the related accumulated depreciation reserves as of December 31 were as follows:

(In thousands)		2018		2017
Nonregulated plant	$	207,361	$	206,063
Accumulated depreciation		(33,897)		(30,061)
Property, plant, and equipment, net		173,464		176,002
Construction work in progress		530		1,225
Total property, plant, and equipment	$	173,994	$	177,227

Forward Wind [Member]

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Joint Plant Ownership

MGE's interest in the portion of Forward Wind's utility plant in service and the related accumulated depreciation reserves as of December 31 were as follows:

(In thousands)		2018
Nonregulated plant	$	33,929
Accumulated depreciation		(12,530)
Property, plant, and equipment, net		21,399
Construction work in progress		67
Total property, plant, and equipment	$	21,466

West Campus [Member]

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Joint Plant Ownership

MGE Power West Campus' interest in WCCF and the related accumulated depreciation reserves as of December 31 were as follows:

(In thousands)		2018		2017
Nonregulated plant	$	113,328	$	111,386
Accumulated depreciation		(32,055)		(31,104)
Property, plant, and equipment, net		81,273		80,282
Construction work in progress		478		610
Total property, plant, and equipment	$	81,751	$	80,892