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ACQUISITIONS - BISHOP HILL III ACQUISITION (Details) - Bishop Hill III Wind Energy Center $ in Millions | 1 Months Ended |
--- | --- | ---
Aug. 31, 2018 USD ($) MW | Oct. 19, 2018
Business Acquisition [Line Items] |  |
WEC's ownership interest in Bishop Hill III Wind Energy Center | 80.00% |
Capacity of Bishop Hill III Wind Energy Center | MW | 132 |
Acquisition purchase price | $ 143.5 |
Restricted cash acquired | $ 4.5 |
Duration of offtake agreement for the sale of energy produced | 22 years |
Bonus depreciation percentage | 100.00% |
Measurement period to complete acquisition purchase price allocation | 1 year |
Subsequent event |  |
Business Acquisition [Line Items] |  |
Bonus depreciation percentage |  | 100.00%
Additional Ownership Interest in Bishop Hill III Wind Energy Center |  | 10.00%

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