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Jointly owned facilities
 12 Months Ended
Dec. 31, 2018
Regulated Operations [Abstract]  
Jointly owned facilities Jointly Owned Facilities
The consolidated financial statements include the Company's ownership interests in the assets, liabilities and expenses of Big Stone Station, Coyote Station and Wygen III. Each owner of the stations is responsible for financing its investment in the jointly owned facilities. The Company has an ownership interest of 22.7 percent in Big Stone Station, 25 percent in Coyote Station and 25 percent in Wygen III.
The Company's share of the stations 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 and related accumulated depreciation for the stations was as follows:
 
2018

2017

 
(In thousands)
Big Stone Station:
 
 
Utility plant in service
$
156,534

$
158,084

Less accumulated depreciation
49,345

51,740

 
$
107,189

$
106,344

Coyote Station:
 

 

Utility plant in service
$
155,236

$
155,287

Less accumulated depreciation
105,565

103,897

 
$
49,671

$
51,390

Wygen III:
 

 

Utility plant in service
$
65,382

$
65,065

Less accumulated depreciation
9,174

7,652

 
$
56,208

$
57,413