XML 47 R25.htm IDEA: XBRL DOCUMENT v3.20.4
Jointly owned facilities
 12 Months Ended
Dec. 31, 2020
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 Percentage20202019
 (In thousands)
Big Stone Station:22.7 %
Utility plant in service$155,967 $152,836 
Construction work in progress104 518 
Less accumulated depreciation45,435 46,266 
$110,636 $107,088 
BSSE:50.0 %
Utility plant in service$107,442 $105,767 
Construction work in progress— — 
Less accumulated depreciation2,682 1,232 
$104,760 $104,535 
Coyote Station:25.0 %
Utility plant in service$159,784 $160,235 
Construction work in progress323 21 
Less accumulated depreciation108,852 107,638 
$51,255 $52,618 
Wygen III:25.0 %
Utility plant in service$66,101 $67,869 
Construction work in progress232 112 
Less accumulated depreciation10,038 10,482 
$56,295 $57,499