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ACQUISITIONS - BISHOP HILL III (Details) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2018 USD ($) MW | Mar. 31, 2019 | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
WEC's ownership interest in Bishop Hill III Wind Energy Center |  | 80.00% |
Bishop Hill III Wind Energy Center |  |  |
Business Acquisition [Line Items] |  |  |
Capacity of Bishop Hill III Wind Energy Center | MW | 132 |  |
Acquisition purchase price | $ 144.7 |  | $ 18.2
Restricted cash acquired | $ 4.5 |  |
Additional Ownership Interest in Bishop Hill III Wind Energy Center |  |  | 10.00%
Duration of offtake agreement for the sale of energy produced | 22 years |  |
Bonus depreciation percentage |  | 100.00% |

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