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Jointly Owned Utility Facilities (Tables)
 12 Months Ended
Dec. 31, 2022
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]  
Schedule of jointly owned utility facilities
Information related to jointly owned utility facilities at December 31, 2022 was as follows:
We PowerWPS
(in millions, except for percentages and MW)Elm Road Generating Station Units 1 and 2Weston Unit 4
Columbia Energy Center Units 1
and 2
Forward WindTwo Creeks
Badger
Hollow I (2)
Ownership83.34 %70.0 %27.5 %44.6 %66.7 %66.7 %
Share of capacity (MW) (1)
1,060.8 387.3 311.1 61.5 100.0 100.0 
In-service date2010 and 201120081975 and 1978200820202021
Property, plant, and equipment$2,425.1 $612.1 $426.1 $119.3 $136.8 $146.2 
Accumulated depreciation$(505.7)$(213.0)$(159.7)$(53.9)$(9.7)$(4.9)
CWIP$64.1 $1.2 $6.8 $0.2 $0.1 $— 

(1)    Capacity for our jointly-owned electric generation facilities, other than Forward Wind, Two Creeks, and Badger Hollow I, is based on rated capacity, which is the net power output under average operating conditions with equipment in an average state of repair as of a given month in a given year. Values are primarily based on the net dependable expected capacity ratings for summer 2023 established by tests and may change slightly from year to year. The summer period is the most relevant for capacity planning purposes. This is a result of continually reaching demand peaks in the summer months, primarily due to air conditioning demand. Capacity for Forward Wind is based on nameplate capacity, which is the amount of energy a turbine should produce at optimal wind speeds. Capacity for Two Creeks and Badger Hollow I is based on nameplate capacity, which is the maximum output that a generator should produce at continuous full power.

(2)    Commercial operation was achieved in November 2021 for Badger Hollow I.