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Jointly owned facilities
 12 Months Ended
Dec. 31, 2021
Regulated Operations [Abstract]  
Jointly owned facilities Jointly Owned Facilities
The consolidated financial statements include the Company's ownership interests in three coal-fired electric generating facilities (Big Stone Station, Coyote Station and Wygen III) and one major transmission line (BSSE). Each owner of the jointly owned facilities is responsible for financing its investment. The Company's share of the jointly owned facilities operating expenses was reflected in the appropriate categories of operating expenses (electric fuel and purchased power; operation and maintenance; and taxes, other than income) in the Consolidated Statements of Income.
At December 31, the Company's share of the cost of utility plant in service, construction work in progress and related accumulated depreciation for the jointly owned facilities was as follows:
Ownership Percentage20212020
 (In thousands)
Big Stone Station:22.7 %
Utility plant in service$157,259 $155,967 
Construction work in progress571 104 
Less accumulated depreciation47,293 45,435 
$110,537 $110,636 
BSSE:50.0 %
Utility plant in service$107,424 $107,442 
Construction work in progress— — 
Less accumulated depreciation4,506 2,682 
$102,918 $104,760 
Coyote Station:25.0 %
Utility plant in service$157,764 $159,784 
Construction work in progress784 323 
Less accumulated depreciation109,202 108,852 
$49,346 $51,255 
Wygen III:25.0 %
Utility plant in service$66,357 $66,101 
Construction work in progress108 232 
Less accumulated depreciation11,383 10,038 
$55,082 $56,295