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Jointly Owned Utility Facilities (Details) $ in Millions | Dec. 31, 2023 USD ($) MW | Sep. 30, 2023 MW
--- | --- | ---
WE | West Riverside |  |
Jointly owned utility facilities |  |
Share of capacity (MW) | MW |  | 100
ER 1 & ER2 | We Power |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 83.34% |
Share of capacity (MW) | MW | 1,082.1 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 2,487.4 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (520.0) |
Construction work in progress | $ 6.2 |
Weston Unit 4 | WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 70.00% |
Share of capacity (MW) | MW | 384.8 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 613.3 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (227.3) |
Construction work in progress | $ 0.5 |
Columbia Energy Center Units 1 and 2 | WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 27.50% |
Share of capacity (MW) | MW | 312.3 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 433.1 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (173.8) |
Construction work in progress | $ 3.5 |
Forward Wind | WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 44.60% |
Share of capacity (MW) | MW | 61.5 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 119.3 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (56.8) |
Construction work in progress | $ 0.0 |
Two Creeks | WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 66.70% |
Share of capacity (MW) | MW | 100.0 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 136.9 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (14.1) |
Construction work in progress | $ 0.0 |
Badger Hollow I | WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 66.70% |
Share of capacity (MW) | MW | 100.0 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 146.2 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (9.7) |
Construction work in progress | $ 0.1 |
Red Barn | WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 90.00% |
Share of capacity (MW) | MW | 82.4 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 150.0 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (3.2) |
Construction work in progress | $ 0.0 |
West Riverside | WE |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 13.80% |
Share of capacity (MW) | MW | 84.9 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 108.7 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (11.3) |
Construction work in progress | $ 0.9 |
Badger Hollow II | WE |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 66.70% |
Share of capacity (MW) | MW | 100.0 |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | $ 170.1 |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | (0.3) |
Construction work in progress | $ 0.1 |
Koshkonong | WE and WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 90.00% |
Jointly owned utility plant, proportionate ownership share of solar capacity | MW | 270 |
Paris | WE and WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 90.00% |
Construction work in progress | $ 334.3 |
Jointly owned utility plant, proportionate ownership share of solar capacity | MW | 180 |
Jointly owned utility plant, proportionate ownership share of battery storage | MW | 99 |
Darien | WE and WPS |  |
Jointly owned utility facilities |  |
Joint plant ownership percentage | 90.00% |
Construction work in progress | $ 220.4 |
Jointly owned utility plant, proportionate ownership share of solar capacity | MW | 225 |

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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//1943274/2147479960/980-360-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//1943274/2147479960/980-360-S99-1 + Details
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