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REGULATORY ENVIRONMENT - WI SOLAR GENERATION PROJECTS (Details) - Public Service Commission of Wisconsin (PSCW) $ in Millions | Aug. 01, 2019 USD ($) MW | May 31, 2018 USD ($) solar_projects MW
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WE | Badger Hollow Solar Farm II |  |
Public Utilities, General Disclosures [Line Items] |  |
Solar project output that approval was requested for from the PSCW (in megawatts) | 100 |
Estimated share of cost for solar project(s) | $ | $ 130 |
WPS | Badger Hollow Solar Farm I |  |
Public Utilities, General Disclosures [Line Items] |  |
Solar project output that approval was requested for from the PSCW (in megawatts) |  | 100
WPS | Two Creeks Solar Project |  |
Public Utilities, General Disclosures [Line Items] |  |
Solar project output that approval was requested for from the PSCW (in megawatts) |  | 100
WPS | Badger Hollow Solar Farm I and Two Creeks Solar Project |  |
Public Utilities, General Disclosures [Line Items] |  |
Number of solar projects for which approval was requested | solar_projects |  | 2
Solar project output that approval was requested for from the PSCW (in megawatts) |  | 200
Estimated share of cost for solar project(s) | $ |  | $ 260

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