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ACQUISITIONS - THUNDERHEAD (Details) - Thunderhead Wind Energy LLC $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($) MW
Business Acquisition [Line Items] |
WEC's ownership interest in Thunderhead Wind Energy LLC | 80.00%
Capacity of Thunderhead Wind Energy | MW | 300
Acquisition purchase price | $ | $ 338
Duration of offtake agreement for the sale of energy produced | 12 years
Bonus depreciation percentage | 100.00%

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