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Jointly Owned Facilities
 12 Months Ended
Dec. 31, 2024
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 two major transmission lines (BSSE and JETx). 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 Percentage20242023
 (In thousands)
Big Stone Station:22.7 %
Utility plant in service$155,302 $159,437 
CWIP
318 197 
Less accumulated depreciation55,327 52,264 
$100,293 $107,370 
BSSE:50.0 %
Utility plant in service$111,043 $107,260 
CWIP
— — 
Less accumulated depreciation10,359 8,111 
$100,684 $99,149 
Coyote Station:25.0 %
Utility plant in service$160,343 $160,208 
CWIP
755 159 
Less accumulated depreciation115,133 113,187 
$45,965 $47,180 
JETx:
50.0 %
Utility plant in service$— $— 
CWIP
6,112 1,372 
Less accumulated depreciation— — 
$6,112 $1,372 
Wygen III:25.0 %
Utility plant in service$67,851 $66,852 
CWIP
97 127 
Less accumulated depreciation15,340 13,728 
$52,608 $53,251