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Joint Ownership of Transmission Facilities (Tables)
 12 Months Ended
Dec. 31, 2017
Joint Ownership of Transmission Facilities [Abstract]  
Investments in Jointly Owned Transmission Facilities
Following are the investments by NSP-Wisconsin in jointly owned transmission facilities and the related ownership percentages as of Dec. 31, 2017:
(Thousands of Dollars)
 
Plant in
Service
 
Accumulated Depreciation
 
CWIP
 
Ownership %
Electric Transmission:
 
 
 
 
 
 
 
 
CapX2020 Transmission
 
$
162,108

 
$
12,205

 
$
103,144

 
81
%
La Crosse, Wis. to Madison, Wis.
 
—

 
—

 
101,546

 
37

Total
 
$
162,108

 
$
12,205

 
$
204,690