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ACQUISITIONS - FORWARD ACQUISITION (Details) - Forward Wind Energy Center $ in Millions | 1 Months Ended |
--- | --- | ---
Oct. 31, 2017 USD ($) wind_turbines utility MW | Sep. 30, 2017
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 |
Approximate purchase price | $ 174 |
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 |
Approximate purchase price | $ 78 |
WPS's share of Forward Wind Energy Center's purchase price | 44.60% |

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