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Jointly owned facilities
 12 Months Ended
Dec. 31, 2022
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 Percentage20222021
 (In thousands)
Big Stone Station:22.7 %
Utility plant in service$157,699 $157,259 
Construction work in progress231 571 
Less accumulated depreciation48,590 47,293 
$109,340 $110,537 
BSSE:50.0 %
Utility plant in service$107,260 $107,424 
Construction work in progress— — 
Less accumulated depreciation6,182 4,506 
$101,078 $102,918 
Coyote Station:25.0 %
Utility plant in service$158,274 $157,764 
Construction work in progress1,807 784 
Less accumulated depreciation111,203 109,202 
$48,878 $49,346 
Wygen III:25.0 %
Utility plant in service$66,238 $66,357 
Construction work in progress273 108 
Less accumulated depreciation12,477 11,383 
$54,034 $55,082