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ACQUISITIONS - FORWARD ACQUISITION (Details) - Forward Wind Energy Center $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2018 USD ($) utility | Apr. 02, 2018 wind_turbines MW | Mar. 31, 2018
WPS |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of Forward Wind Energy Center's output purchased by WPS |  |  | 44.60%
Subsequent event |  |  |
Business Acquisition [Line Items] |  |  |
Number of wind turbines at Forward Wind Energy Center | wind_turbines |  | 86 |
Capacity of Foward Wind Energy Center | MW |  | 129 |
Purchase price | $ 173.9 |  |
Subsequent event | WPS |  |  |
Business Acquisition [Line Items] |  |  |
Number of utilities along with WPS that entered in an agreement to purchase Forward Wind Energy Center | utility | 2 |  |
Purchase price | $ 77.6 |  |
WPS's share of Forward Wind Energy Center's purchase price | 44.60% |  |

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