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Joint Plant Ownership (Tables)
 12 Months Ended
Dec. 31, 2020
Regulated Operations [Abstract]  
Schedule of Joint Plant Ownership The following table shows MGE's interest in utility plant in service, and the related accumulated depreciation reserves and other information related to MGE's jointly owned facilities:

(In thousands, except for percentages and MW)

 

Columbia(a)

 

Elm Road(b)

 

West Campus(c)

 

Forward Wind(d)

 

Two Creeks(e)

 

Badger Hollow I & II(f)

 

Ownership interest

 

19

%

8.33

%

55

%

12.8

%

33

%

33

%

Share of generation (MW)

 

211

MW

106

MW

157

MW

18

MW

50

MW

100

MW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For the year ended December 31,

 

 

 

 

 

 

 

 

 

 

 

 

 

Operating expense - 2020

$

27,127

$

17,259

$

(g)

$

664

$

118

$

-

 

Operating expense - 2019

 

32,604

 

19,661

 

(g)

 

642

 

-

 

-

 

Operating expense - 2018

 

36,517

 

17,555

 

(g)

 

600 (h)

 

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

Utility plant

$

289,597

$

203,847

$

115,657

$

34,028

$

67,577

$

-

 

Accumulated depreciation

 

(118,742)

 

(36,964)

 

(36,580)

 

(14,092)

 

(225)

 

-

 

Construction work in progress

 

997

 

697

 

677

 

-

 

-

 

63,140

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

Utility plant

$

291,997

$

207,834

$

113,259

$

34,054

$

-

$

-

 

Accumulated depreciation

 

(105,778)

 

(37,071)

 

(33,786)

 

(13,413)

 

-

 

-

 

Construction work in progress

 

1,777

 

468

 

309

 

45

 

45,286

 

18,953

 

(a)In February 2021, MGE and the other co-owners announced plans to retire Columbia, a two unit coal-fired generation facility located in Portage, Wisconsin. The co-owners intend to retire Unit 1 by the end of 2023 and Unit 2 by the end of 2024. Final timing and retirement dates for Units 1 and 2 are subject to PSCW and regional regulatory reviews, including identification and approval of energy and capacity resources to replace Columbia.

(b) Two coal-fired generating units in Oak Creek, Wisconsin.

(c)MGE Power West Campus and the UW jointly own the West Campus Cogeneration Facility (WCCF) located on the UW campus in Madison, Wisconsin. The UW owns a controlling interest in the chilled-water and steam plants, which are used to meet the needs for air-conditioning and steam-heat capacity for the UW campus. MGE Power West Campus owns a controlling interest in the electric generation plant, which is leased and operated by MGE.

(d)The Forward Wind Energy Center (Forward Wind) consists of 86 wind turbines located near Brownsville, Wisconsin.

(e) The Two Creeks solar generation array is located in the Town of Two Creeks and the City of Two Rivers in Manitowoc and Kewaunee Counties, Wisconsin. Date of commercial operation of the solar array was November 2020.

(f)The Badger Hollow I and II solar farm is located in southwestern Wisconsin in Iowa County, near the villages of Montfort and Cobb. Badger Hollow I and II estimated commercial operation dates are April 2021 and December 2022, respectively.

(g)Operating charges are allocated to the UW based on formulas contained in the operating agreement. Under the provisions of this arrangement, the UW is required to reimburse MGE for their allocated portion of fuel and operating expenses. For the years ended December 31, 2020, 2019, and 2018, the UW's allocated share of fuel and operating costs was $5.2 million, $6.6 million, and $6.3 million, respectively.

(h)Amount was deferred as a regulatory asset in 2018. This amount was recovered in rates and recognized as operating and maintenance expense in 2019.