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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Major classes of property, plant and equipment as of December 31, 2021 and 2020 include:
(in thousands)20212020
Electric Plant in Service  
Production$1,332,067 $1,172,362 
Transmission722,739 690,647 
Distribution574,488 545,221 
General129,151 123,122 
Electric Plant in Service2,758,445 2,531,352 
Construction Work in Progress74,926 203,078 
Total Gross Electric Plant2,833,371 2,734,430 
Less Accumulated Depreciation and Amortization817,302 778,988 
Net Electric Plant$2,016,069 $1,955,442 
Nonelectric Property, Plant and Equipment
Equipment$203,390 $197,389 
Buildings and Leasehold Improvements56,908 55,441 
Land13,652 5,900 
Nonelectric Property, Plant and Equipment273,950 258,730 
Construction Work in Progress16,611 9,290 
Total Gross Nonelectric Property, Plant and Equipment290,561 268,020 
Less Accumulated Depreciation and Amortization182,025 174,189 
Net Nonelectric Property, Plant and Equipment108,536 93,831 
Net Property, Plant and Equipment$2,124,605 $2,049,273 
Depreciation expense for the years ended December 31, 2021, 2020 and 2019 totaled $85.8 million, $78.6 million and $71.9 million.
The following table provides OTP’s ownership percentages and amounts included in the December 31, 2021 and 2020 consolidated balance sheets for OTP’s share of each of these jointly owned facilities:
 (dollars in thousands)Ownership
Percentage		Electric Plant
in Service		Construction
Work in
Progress		Accumulated
Depreciation		Net Plant
December 31, 2021     
Big Stone Plant53.9 %$338,699 $260 $(110,604)$228,355 
Coyote Station35.0 %182,610 1,110 (107,894)75,826 
Big Stone South–Ellendale 345 kV line50.0 %106,194 — (4,052)102,142 
Fargo–Monticello 345 kV line14.2 %78,184 — (9,069)69,115 
Big Stone South–Brookings 345 kV line50.0 %52,975 — (3,613)49,362 
Brookings–Southeast Twin Cities 345 kV line4.8 %26,291 — (2,843)23,448 
Bemidji–Grand Rapids 230 kV line14.8 %16,331 — (2,995)13,336 
December 31, 2020
Big Stone Plant53.9 %$332,611 $2,552 $(103,504)$231,659 
Coyote Station35.0 %180,991 732 (108,603)73,120 
Big Stone South–Ellendale 345 kV line50.0 %106,353 — (2,433)103,920 
Fargo–Monticello 345 kV line14.2 %78,184 — (8,029)70,155 
Big Stone South–Brookings 345 kV line50.0 %53,036 — (2,822)50,214 
Brookings–Southeast Twin Cities 345 kV line4.8 %26,291 — (2,468)23,823 
Bemidji–Grand Rapids 230 kV line14.8 %16,331 — (2,670)13,661