Joint Plant (Tables)

6 Months Ended

Jun. 30, 2022

Public Utilities, Property, Plant and Equipment [Abstract]

Schedule of Jointly Owned Utility Plants

MGE currently has ongoing jointly-owned solar generation construction projects, as shown in the following table. Incurred costs are reflected in "Construction work in progress" on the consolidated balance sheets.

	Ownership	Share of	Share of	Costs incurred as of June 30,	Estimated Date of Commercial
Project	Interest	Generation	Estimated Costs(a)	2022(a)	Operation
Red Barn(b)	10%	9.16 MW	$18 million	$0.6 million	December 2022
Badger Hollow II(c)	33%	50 MW	$76 million(e)	$47.5 million(f)	First Half of 2023
Paris(d)	10%	31 MW	$51 million(e)	$15.4 million	2023(g)

(a)Excluding AFUDC.

(b)The Red Barn Wind Farm is located in the Towns of Wingville and Clifton in Grant County, Wisconsin.

(c)The Badger Hollow II solar farm is located in southwestern Wisconsin in Iowa County, near the villages of Montfort and Cobb.

(d)Paris Solar-Battery Park is located in the Town of Paris in Kenosha County, Wisconsin.

(e)In 2022, MGE notified the PSCW of increases in projected costs at Badger Hollow II and Paris. The main drivers were increases in the costs of key commodities, labor, and solar modules resulting from supply chain and market disruptions. MGE expects to recover the incremental costs through future rates.

(f)Includes an allocation of common facilities at Badger Hollow placed in service in November 2021.

(g)Battery storage timing to be determined.