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ACQUISITIONS - COYOTE RIDGE (Details) - Coyote Ridge Wind $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) MW | Sep. 30, 2019 USD ($) Years
Business Acquisition [Line Items] |  |
WEC's ownership interest in Coyote Ridge Wind, LLC | 80.00% |
Capacity of Coyote Ridge | MW | 97.5 |
Acquisition purchase price | $ 61.6 |
Total expected investment |  | $ 145.0
Duration of offtake agreement for the sale of energy produced | 12 years |
Bonus depreciation percentage |  | 100.00%
Percent of tax benefits entitled to |  | 99.00%
Years entitled to 99 percent of tax benefits | Years |  | 11

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