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ACQUISITIONS - FORWARD WIND ENERGY CENTER (Details) - Forward Wind Energy Center Acquisition $ in Millions | 1 Months Ended | 6 Months Ended
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Apr. 30, 2018 wind_turbines utility MW | Jun. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |
Number of utilities along with WPS that entered in an agreement to purchase Forward Wind Energy Center | utility | 2 |
Number of wind turbines at Forward Wind Energy Center | wind_turbines | 86 |
Capacity of Foward Wind Energy Center | MW | 138 |
Purchase price | $ |  | $ 172.9
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 | $ |  | $ 77.1
WPS's share of Forward Wind Energy Center's purchase price | 44.60% |
Percentage of Forward Wind Energy Center's output purchased by WPS | 44.60% |

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