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Jointly Owned Utility Facilities (Details) $ in Millions | Dec. 31, 2019 USD ($) MW | Aug. 01, 2019 MW | May 31, 2018 solar_projects
--- | --- | --- | ---
Elm Road Generating Station Units 1 and 2 | We Power |  |  |
Jointly Owned Electric Generating Facilities |  |  |
Ownership (as a percentage) | 83.34% |  |
Share of rated capacity (MW) (1) | MW | 1,054.3 |  |
Property, plant, and equipment | $ 2,447.9 |  |
Accumulated depreciation | (416.1) |  |
Construction Work in Progress | $ 0.8 |  |
Weston 4 | WPS |  |  |
Jointly Owned Electric Generating Facilities |  |  |
Ownership (as a percentage) | 70.00% |  |
Share of rated capacity (MW) (1) | MW | 386.0 |  |
Property, plant, and equipment | $ 663.2 |  |
Accumulated depreciation | (232.4) |  |
Construction Work in Progress | $ 5.3 |  |
Columbia Energy Center Units 1 and 2 | WPS |  |  |
Jointly Owned Electric Generating Facilities |  |  |
Future Ownership Interest of Columbia | 27.50% |  |
Ownership (as a percentage) | 27.60% |  |
Share of rated capacity (MW) (1) | MW | 313.9 |  |
Property, plant, and equipment | $ 422.3 |  |
Accumulated depreciation | (129.5) |  |
Construction Work in Progress | $ 1.8 |  |
Forward Wind Energy Center | WPS |  |  |
Jointly Owned Electric Generating Facilities |  |  |
Ownership (as a percentage) | 44.60% |  |
Share of rated capacity (MW) (1) | MW | 8.4 |  |
Property, plant, and equipment | $ 118.7 |  |
Accumulated depreciation | (46.4) |  |
Construction Work in Progress | $ 0.1 |  |
Badger Hollow and Two Creeks Solar Farms | WPS |  |  |
Jointly Owned Electric Generating Facilities |  |  |
Number Of Solar Projects Acquisition Approval Requested | solar_projects |  |  | 2
Capacity Of Solar Project Owned By Entity | MW | 200 |  |
Badger Hollow Solar Farm I | WPS |  |  |
Jointly Owned Electric Generating Facilities |  |  |
Construction Work in Progress | $ 32.5 |  |
Capacity Of Solar Project Owned By Entity | MW | 100 |  |
Two Creeks Solar Project | WPS |  |  |
Jointly Owned Electric Generating Facilities |  |  |
Construction Work in Progress | $ 87.3 |  |
Capacity Of Solar Project Owned By Entity | MW | 100 |  |
Badger Hollow Solar Farm II | WE |  |  |
Jointly Owned Electric Generating Facilities |  |  |
Capacity of Solar Project Approval Was Requested for from the PSCW | MW |  | 100 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References 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 http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References 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 http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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- Definition The portion of the capacity of a solar project owned by the entity (in megawatts). + References No definition available. + Details
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- Definition Capacity of a solar project that approval was requested for from the PSCW. + References No definition available. + Details
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- Definition The future proportionate share of interest (percent) in Columbia as capital expenditures increase by Columbia and not WPS, through June 1, 2020 + References No definition available. + Details
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- Definition The entity's proportionate share of the rated capacity of a jointly owned utility plant. + References No definition available. + Details
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