Jointly Owned Utility Facilities (Tables)

12 Months Ended

Dec. 31, 2023

Jointly Owned Utility Plant, Net Ownership Amount [Abstract]

Schedule of jointly owned utility facilities

Information related to jointly owned utility facilities at December 31, 2023 was as follows:

Company	Jointly-Owned Utility Facilities	Ownership		Share of Capacity (MW)	In-Service /Acquisition Date	Operating Owner	Property, Plant, and Equipment		Accumulated Depreciation		CWIP
(in millions, except for percentages and MW)
We Power (1)	ER 1 & ER 2 (2)	83.34	%	1,082.1	2010 & 2011	WE	$	2,487.4	$	(520.0)	$	6.2
WPS	Weston Unit 4 (2)	70.0	%	384.8	2008	WPS	613.3		(227.3)		0.5
WPS	Columbia Energy Center Units 1 and 2 (2) (5)	27.5	%	312.3	1975 & 1978	WPL	433.1		(173.8)		3.5
WPS	Forward Wind (3)	44.6	%	61.5	2008	WPS	119.3		(56.8)		—
WPS	Two Creeks (4)	66.7	%	100.0	2020	WPS	136.9		(14.1)		—
WPS	Badger Hollow I (4)	66.7	%	100.0	2021	WPS	146.2		(9.7)		0.1
WPS	Red Barn (3)	90.0	%	82.4	2023	WPS	150.0		(3.2)		—
WE	West Riverside (2) (6)	13.8	%	84.9	2023	WE	108.7		(11.3)		0.9
WE	Badger Hollow II (4)	66.7	%	100.0	2023	WE	170.1		(0.3)		0.1

(1)    We Power leases its ownership interest in ER 1 and ER 2 to WE.

(2)    Capacity 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 2024 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.

(3)     Capacity for wind generating facilities is based on nameplate capacity, which is the amount of energy a turbine should produce at optimal wind speeds.

(4)     Capacity for solar generating facilities is based on nameplate capacity, which is the maximum output that a generator should produce at continuous full power.

(5)    These units are expected to be retired by June 2026. See Note 7, Property, Plant, and Equipment, for more information.

(6    WE acquired its ownership interest in June 2023. In September 2023, WPS filed a request with the PSCW to exercise a second option to acquire an additional 100 MWs of West Riverside's nameplate capacity. WPS subsequently filed for approval to assign its ownership interest pursuant to this second option to WE. See Note 2, Acquisitions, for more information.