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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Major classes of property, plant and equipment as of December 31, 2024 and 2023 include:

(in thousands)			2024						2023
Electric Plant in Service
Production			$	1,469,008					$	1,412,826
Transmission			820,415						777,613
Distribution			726,159						654,704
General			165,361						144,738
Electric Plant in Service			3,180,943						2,989,881
Construction Work in Progress			231,890						137,212
Total Gross Electric Plant			3,412,833						3,127,093
Less Accumulated Depreciation			899,049						851,148
Net Electric Plant			2,513,784						2,275,945
Nonelectric Property, Plant and Equipment
Equipment			260,307						233,571
Buildings and Leasehold Improvements			88,680						64,753
Land			13,578						13,600
Nonelectric Property, Plant and Equipment			362,565						311,924
Construction Work in Progress			40,536						38,062
Total Gross Nonelectric Property, Plant and Equipment			403,101						349,986
Less Accumulated Depreciation			224,425						207,556
Net Nonelectric Property, Plant and Equipment			178,676						142,430
Net Property, Plant and Equipment			$	2,692,460					$	2,418,375

Schedule of Jointly Owned Utility Plants

The following table provides OTP’s ownership percentages and amounts included in the December 31, 2024 and 2023 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, 2024
Big Stone Plant			53.9		%				$	345,990					$	459					$	(135,065)					$	211,384
Coyote Station			35.0		%				188,066						813						(118,268)						70,611
Big Stone South–Ellendale 345 kV line			50.0		%				106,185						—						(8,445)						97,740
Fargo–Monticello 345 kV line			14.2		%				78,184						—						(12,247)						65,937
Big Stone South–Brookings 345 kV line			50.0		%				53,167						—						(5,822)						47,345
Brookings–Southeast Twin Cities 345 kV line			4.8		%				28,013						1,131						(3,941)						25,203
Bemidji–Grand Rapids 230 kV line			14.8		%				16,331						—						(3,693)						12,638
Jamestown– Ellendale 345 kV line			50.0		%				—						5,509						—						5,509
Big Stone South–Alexandria 345 kV line			40.0		%				—						2,418						—						2,418
Alexandria–Big Oaks 345 kV line			14.2		%				—						417						—						417
Oslo - Lake Ardoch 115 kV line			72.0		%				—						2,646						—						2,646
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

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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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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/1943274/2147479070/980-360-S99-1

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