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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Major classes of property, plant and equipment as of December 31, 2023 and 2022 include:

(in thousands)			2023						2022
Electric Plant in Service
Production			$	1,412,826					$	1,343,097
Transmission			777,613						756,848
Distribution			654,704						612,716
General			144,738						131,718
Electric Plant in Service			2,989,881						2,844,379
Construction Work in Progress			137,212						113,932
Total Gross Electric Plant			3,127,093						2,958,311
Less Accumulated Depreciation and Amortization			851,148						859,988
Net Electric Plant			2,275,945						2,098,323
Nonelectric Property, Plant and Equipment
Equipment			233,571						218,770
Buildings and Leasehold Improvements			64,753						61,506
Land			13,600						13,652
Nonelectric Property, Plant and Equipment			311,924						293,928
Construction Work in Progress			38,062						15,170
Total Gross Nonelectric Property, Plant and Equipment			349,986						309,098
Less Accumulated Depreciation and Amortization			207,556						194,704
Net Nonelectric Property, Plant and Equipment			142,430						114,394
Net Property, Plant and Equipment			$	2,418,375					$	2,212,717

Schedule of Jointly Owned Utility Plants

The following table provides OTP’s ownership percentages and amounts included in the December 31, 2023 and 2022 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, 2023
Big Stone Plant			53.9		%				$	341,683					$	820					$	(126,904)					$	215,599
Coyote Station			35.0		%				188,656						104						(115,306)						73,454
Big Stone South–Ellendale 345 kV line			50.0		%				106,185						—						(7,181)						99,004
Fargo–Monticello 345 kV line			14.2		%				78,184						—						(11,238)						66,946
Big Stone South–Brookings 345 kV line			50.0		%				53,170						—						(5,207)						47,963
Brookings–Southeast Twin Cities 345 kV line			4.8		%				26,409						83						(3,617)						22,875
Bemidji–Grand Rapids 230 kV line			14.8		%				16,331						—						(3,568)						12,763
Jamestown– Ellendale 345 kV line			50.0		%				—						1,121						—						1,121
Big Stone South–Alexandria 345 kV line			40.0		%				—						555						—						555
Alexandria–Big Oaks 345 kV line			14.2		%				—						343						—						343
December 31, 2022
Big Stone Plant			53.9		%				$	338,411					$	557					$	(118,044)					$	220,924
Coyote Station			35.0		%				183,461						2,315						(111,666)						74,110
Big Stone South–Ellendale 345 kV line			50.0		%				106,185						—						(5,587)						100,598
Fargo–Monticello 345 kV line			14.2		%				78,184						—						(10,095)						68,089
Big Stone South–Brookings 345 kV line			50.0		%				53,041						—						(4,406)						48,635
Brookings–Southeast Twin Cities 345 kV line			4.8		%				26,291						—						(3,211)						23,080
Bemidji–Grand Rapids 230 kV line			14.8		%				16,331						—						(3,318)						13,013

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- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-1

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- Definition

Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1

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