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Jointly Owned Utility Facilities (Tables) | 12 Months Ended
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Dec. 31, 2024
Jointly Owned Utility Plant, Net Ownership Amount [Abstract] |
Schedule of jointly owned utility facilities | Information related to jointly owned utility facilities at December 31, 2024 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 | % |  | 1,083.4 |  |  | 2010 & 2011 |  | WE |  | $ | 2,482.4 |  |  | $ | (548.3) |  |  | $ | 4.3 |
WPS |  | Weston Unit 4 (2) |  |  |  | 70.0 | % |  | 383.4 |  |  | 2008 |  | WPS |  | 600.9 |  |  | (230.7) |  |  | 1.6 |
WPS |  | Columbia Units 1 & 2 (2) (5) |  |  |  | 27.5 | % |  | 307.5 |  |  | 1975 & 1978 |  | WPL |  | 436.5 |  |  | (186.9) |  |  | 4.0 |
WPS |  | Forward Wind (3) |  |  |  | 44.6 | % |  | 61.5 |  |  | 2008 |  | WPS |  | 120.1 |  |  | (60.0) |  |  | — |
WPS |  | Two Creeks (4) |  |  |  | 66.7 | % |  | 100.0 |  |  | 2020 |  | WPS |  | 136.9 |  |  | (18.6) |  |  | — |
WPS |  | Badger Hollow I (4) |  |  |  | 66.7 | % |  | 100.0 |  |  | 2021 |  | WPS |  | 146.5 |  |  | (14.5) |  |  | 0.4 |
WPS |  | Red Barn (3) |  |  |  | 90.0 | % |  | 82.4 |  |  | 2023 |  | WPS |  | 150.6 |  |  | (8.1) |  |  | — |
WE |  | West Riverside (2) (6) |  |  |  | 27.5 | % |  | 190.5 |  |  | 2023 & 2024 |  | WPL |  | 217.8 |  |  | (29.5) |  |  | 3.2 |
WE |  | Badger Hollow II (4) |  |  |  | 66.7 | % |  | 100.0 |  |  | 2023 |  | WE |  | 179.4 |  |  | (6.0) |  |  | 0.4 |
WE, WPS |  | Paris (solar portion) (4) |  |  |  | 90.0 | % |  | 180.0 |  |  | 2024 |  | WE |  | 357.8 |  |  | — |  |  | 0.5 |
(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 2025 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 coal units are expected to be retired by the end of 2029. See Note 7, Property, Plant, and Equipment, for more information. (6) WE acquired a 13.8% ownership interest in June 2023 and acquired an additional 13.7% ownership interest in May 2024. See Note 2, Acquisitions, for more information.

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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + 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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