XML 76 R65.htm IDEA: XBRL DOCUMENT v3.19.2
REGULATORY ENVIRONMENT (Details) - Public Service Commission of Wisconsin (PSCW)
$ in Millions
1 Months Ended
Mar. 31, 2019
USD ($)
Sep. 30, 2017
USD ($)
May 31, 2018
USD ($)
solar_projects
MW
Badger hollow solar farm and two creeks solar project      
Regulatory environment      
Number of solar projects for which approval has been requested | solar_projects     2
Total output of two solar projects owned by WPS (in megawatts) | MW     200
WPS share of cost for certain solar projects     $ 260.0
Two creeks solar project      
Regulatory environment      
Solar project output owned by WPS (in megawatts) | MW     100
Badger hollow solar farm      
Regulatory environment      
Solar project output owned by WPS (in megawatts) | MW     100
2020 rates | Electric rates      
Regulatory environment      
Requested rate increase $ 49.0    
Requested rate increase (as a percent) 4.90%    
2020 rates | Natural gas rates      
Regulatory environment      
Requested rate increase $ 7.0    
Requested rate increase (as a percent) 2.40%    
2020 rates | Natural gas rates | Tax Cuts and Jobs Act of 2017      
Regulatory environment      
Change in regulatory liabilities from tax legislation $ 7.0    
2021 rates | Electric rates      
Regulatory environment      
Requested rate increase $ 49.0    
Requested rate increase (as a percent) 4.90%    
2021 rates | Natural gas rates      
Regulatory environment      
Requested rate increase $ 7.0    
Requested rate increase (as a percent) 2.40%    
2020 and 2021 rates      
Regulatory environment      
Requested return on equity (as a percent) 10.35%    
Requested common equity component average (as a percent) 52.00%    
2020 and 2021 rates | Electric rates | Tax Cuts and Jobs Act of 2017      
Regulatory environment      
Change in regulatory liabilities from tax legislation $ 40.0    
2018 and 2019 rates      
Regulatory environment      
Approved return on equity (as a percent)   10.00%  
Authorized revenue requirement for the ReACT project   $ 275.0  
AFUDC   51.0  
Estimated cost of the ReACT project, excluding AFUDC   $ 342.0  
Percentage of first 50 basis points of additional utility earnings shared with customers   50.00%  
Return on equity in excess of authorized amount (as a percent)   0.50%