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Jointly Owned Utility Facilities (Details) $ in Millions | Dec. 31, 2024 USD ($) MW | May 31, 2024 MW | Jun. 30, 2023
--- | --- | --- | ---
WE | West Riverside |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage |  | 27.50% |
Share of capacity (MW) | MW |  | 200 |
ER 1 & ER2 | We Power |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 83.34% |  |
Share of capacity (MW) | MW | 1,083.4 |  |
Property, plant, and equipment | $ 2,482.4 |  |
Accumulated depreciation | (548.3) |  |
CWIP | $ 4.3 |  |
Weston Unit 4 | WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 70.00% |  |
Share of capacity (MW) | MW | 383.4 |  |
Property, plant, and equipment | $ 600.9 |  |
Accumulated depreciation | (230.7) |  |
CWIP | $ 1.6 |  |
Columbia Units 1 and 2 | WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 27.50% |  |
Share of capacity (MW) | MW | 307.5 |  |
Property, plant, and equipment | $ 436.5 |  |
Accumulated depreciation | (186.9) |  |
CWIP | $ 4.0 |  |
Forward Wind | WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 44.60% |  |
Share of capacity (MW) | MW | 61.5 |  |
Property, plant, and equipment | $ 120.1 |  |
Accumulated depreciation | (60.0) |  |
CWIP | $ 0.0 |  |
Two Creeks | WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 66.70% |  |
Share of capacity (MW) | MW | 100.0 |  |
Property, plant, and equipment | $ 136.9 |  |
Accumulated depreciation | (18.6) |  |
CWIP | $ 0.0 |  |
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 | $ 146.5 |  |
Accumulated depreciation | (14.5) |  |
CWIP | $ 0.4 |  |
Red Barn | WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 90.00% |  |
Share of capacity (MW) | MW | 82.4 |  |
Property, plant, and equipment | $ 150.6 |  |
Accumulated depreciation | (8.1) |  |
CWIP | $ 0.0 |  |
West Riverside | WE |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 27.50% | 13.70% | 13.80%
Share of capacity (MW) | MW | 190.5 |  |
Property, plant, and equipment | $ 217.8 |  |
Accumulated depreciation | (29.5) |  |
CWIP | $ 3.2 |  |
Badger Hollow II | WE |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 66.70% |  |
Share of capacity (MW) | MW | 100.0 |  |
Property, plant, and equipment | $ 179.4 |  |
Accumulated depreciation | (6.0) |  |
CWIP | $ 0.4 |  |
Paris Solar | WE and WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 90.00% |  |
Share of capacity (MW) | MW | 180.0 |  |
Property, plant, and equipment | $ 357.8 |  |
Accumulated depreciation | 0.0 |  |
CWIP | $ 0.5 |  |
Paris Battery | WE and WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 90.00% |  |
Share of capacity (MW) | MW | 99 |  |
CWIP | $ 217.0 |  |
Darien solar and battery | WE and WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 90.00% |  |
CWIP | $ 422.2 |  |
Darien Solar Park | WE and WPS |  |  |
Jointly owned utility facilities |  |  |
Share of capacity (MW) | MW | 225 |  |
Darien Battery | WE and WPS |  |  |
Jointly owned utility facilities |  |  |
Share of capacity (MW) | MW | 68 |  |
Koshkonong Solar and Battery | WE and WPS |  |  |
Jointly owned utility facilities |  |  |
Joint plant ownership percentage | 90.00% |  |
CWIP | $ 140.3 |  |
Koshkonong Solar | WE and WPS |  |  |
Jointly owned utility facilities |  |  |
Share of capacity (MW) | MW | 270 |  |
Koshkonong Battery | WE and WPS |  |  |
Jointly owned utility facilities |  |  |
Share of capacity (MW) | MW | 149 |  |

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
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