Jointly Owned Utility Facilities (Details) $ in Millions	Dec. 31, 2022 USD ($) MW
Elm Road Generating Station Units 1 and 2 \| We Power
Jointly owned utility facilities
Joint plant ownership percentage	83.34%
Share of capacity (MW) \| MW	1,060.8
Property, plant, and equipment	$ 2,425.1
Accumulated depreciation	(505.7)
Construction work in progress	$ 64.1
Weston Unit 4 \| WPS
Jointly owned utility facilities
Joint plant ownership percentage	70.00%
Share of capacity (MW) \| MW	387.3
Property, plant, and equipment	$ 612.1
Accumulated depreciation	(213.0)
Construction work in progress	$ 1.2
Columbia Energy Center Units 1 and 2 \| WPS
Jointly owned utility facilities
Joint plant ownership percentage	27.50%
Share of capacity (MW) \| MW	311.1
Property, plant, and equipment	$ 426.1
Accumulated depreciation	(159.7)
Construction work in progress	$ 6.8
Forward Wind Energy Center \| WPS
Jointly owned utility facilities
Joint plant ownership percentage	44.60%
Share of capacity (MW) \| MW	61.5
Property, plant, and equipment	$ 119.3
Accumulated depreciation	(53.9)
Construction work in progress	$ 0.2
Two Creeks \| WPS
Jointly owned utility facilities
Joint plant ownership percentage	66.70%
Share of capacity (MW) \| MW	100.0
Property, plant, and equipment	$ 136.8
Accumulated depreciation	(9.7)
Construction work in progress	$ 0.1
Badger Hollow I \| WPS
Jointly owned utility facilities
Joint plant ownership percentage	66.70%
Share of capacity (MW) \| MW	100.0
Property, plant, and equipment	$ 146.2
Accumulated depreciation	(4.9)
Construction work in progress	$ 0.0
Badger Hollow II \| WE
Jointly owned utility facilities
Joint plant ownership percentage	66.70%
Share of capacity (MW) \| MW	100
Construction work in progress	$ 107.5
Paris \| WE and WPS
Jointly owned utility facilities
Joint plant ownership percentage	90.00%
Jointly owned utility plant, proportionate ownership share of solar capacity \| MW	180
Jointly owned utility plant, proportionate ownership share of battery storage \| MW	99
Construction work in progress	$ 207.6
Darien \| WE and WPS
Jointly owned utility facilities
Joint plant ownership percentage	90.00%
Jointly owned utility plant, proportionate ownership share of solar capacity \| MW	225
Jointly owned utility plant, proportionate ownership share of battery storage \| MW	68
Construction work in progress	$ 9.4

The period end amount owned by the reporting utility of a jointly owned utility plant in service.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-URI https://asc.fasb.org/extlink&oid=122136288&loc=d3e659983-123033

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The period end amount of construction work in progress at a jointly owned electricity generation plant.

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The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

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Jointly Owned Utility Plant, Proportionate Ownership Share of Battery Storage

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- Definition

The entity's proportionate share of the capacity of a jointly owned utility plant.

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Jointly Owned Utility Plant, Proportionate Ownership Share of Solar Capacity

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