Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2025

Property, Plant and Equipment [Abstract]

Public Utility Property, Plant, and Equipment

The following table sets forth our property, plant and equipment by property type, for the periods indicated:

	December 31,
	2025		2024
	(Thousands of dollars)
Natural gas distribution pipelines and related equipment	$	7,797,444	$	7,278,542
Natural gas transmission pipelines and related equipment	771,304		736,229
General plant and other	1,066,476		942,677
Construction work in process	98,926		166,686
Property, plant and equipment	9,734,150		9,124,134
Accumulated depreciation and amortization	(2,611,952)		(2,478,261)
Net property, plant and equipment	$	7,122,198	$	6,645,873