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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Major classes of property, plant and equipment as of December 31, 2022 and 2021 include:
(in thousands)20222021
Electric Plant in Service  
Production$1,343,097 $1,332,067 
Transmission756,848 722,739 
Distribution612,716 574,488 
General131,718 129,151 
Electric Plant in Service2,844,379 2,758,445 
Construction Work in Progress113,932 74,926 
Total Gross Electric Plant2,958,311 2,833,371 
Less Accumulated Depreciation and Amortization859,988 817,302 
Net Electric Plant2,098,323 2,016,069 
Nonelectric Property, Plant and Equipment
Equipment218,770 203,390 
Buildings and Leasehold Improvements61,506 56,908 
Land13,652 13,652 
Nonelectric Property, Plant and Equipment293,928 273,950 
Construction Work in Progress15,170 16,611 
Total Gross Nonelectric Property, Plant and Equipment309,098 290,561 
Less Accumulated Depreciation and Amortization194,704 182,025 
Net Nonelectric Property, Plant and Equipment114,394 108,536 
Net Property, Plant and Equipment$2,212,717 $2,124,605 
Schedule of Jointly Owned Utility Plants The following table provides OTP’s ownership percentages and amounts included in the December 31, 2022 and 2021 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, 2022     
Big Stone Plant53.9 %$338,411 $557 $(118,044)$220,924 
Coyote Station35.0 %183,461 2,315 (111,666)74,110 
Big Stone South–Ellendale 345 kV line50.0 %106,185 — (5,587)100,598 
Fargo–Monticello 345 kV line14.2 %78,184 — (10,095)68,089 
Big Stone South–Brookings 345 kV line50.0 %53,041 — (4,406)48,635 
Brookings–Southeast Twin Cities 345 kV line4.8 %26,291 — (3,211)23,080 
Bemidji–Grand Rapids 230 kV line14.8 %16,331 — (3,318)13,013 
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