Jointly Owned Utility Facilities (Tables)

12 Months Ended

Dec. 31, 2020

Jointly Owned Utility Plant, Net Ownership Amount [Abstract]

Schedule of jointly owned utility facilities

Information related to jointly owned utility facilities at December 31, 2020 was as follows:

	We Power			WPS
(in millions, except for percentages and MW)	Elm Road Generating Station Units 1 and 2			Weston Unit 4			Columbia Energy Center Units 1 and 2			Forward Wind Energy Center			Two Creeks (2)
Ownership	83.34		%	70.0		%	27.5		%	44.6		%	66.7		%
Share of capacity (MW) (1)	1,059.4			385.0			311.1			61.5			100.0
In-service date	2010 and 2011			2008			1975 and 1978			2008			2020
Property, plant, and equipment	$	2,436.5		$	613.5		$	422.3		$	118.9		$	136.0
Accumulated depreciation	$	(447.2)		$	(218.6)		$	(145.5)		$	(49.6)		$	(0.7)
CWIP	$	2.2		$	3.8		$	2.3		$	—		$	—

(1)    Capacity for our jointly-owned electric generation facilities, other than Forward Wind Energy Center and Two Creeks, 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 2021 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 Energy Center is based on nameplate capacity, which is the amount of energy a turbine should produce at optimal wind speeds. Capacity for Two Creeks 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 2020 for Two Creeks.