Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment at December 31 was as follows:

	2023		2022		Weighted Average Depreciable Life in Years
	(Dollars in thousands, where applicable)
Regulated:
Electric:
Generation	$	939,474	$	938,614	48
Distribution	521,215		489,351		47
Transmission	639,999		616,611		65
Construction in progress	115,103		87,003		0
Other	153,248		145,034		15
Natural gas distribution:
Distribution	2,771,540		2,569,921		53
Transmission	115,057		104,769		54
Storage	42,654		42,318		37
General	215,572		204,993		13
Construction in progress	70,373		55,759		0
Other	246,991		230,299		15
Pipeline:
Transmission	1,035,995		951,187		46
Storage	57,160		55,383		53
Construction in progress	55,832		34,655		0
Other	63,867		59,917		18
Non-regulated:
Pipeline:
Construction in progress	1,206		49		0
Other	4,327		6,950		9
Construction services:
Land	8,662		8,234		0
Buildings and improvements	52,667		50,776		23
Machinery, vehicles and equipment	191,802		179,459		7
Other	6,718		6,642		4
Other:
Land	2,289		2,648		0
Other	29,365		34,057		7
Less accumulated depreciation and amortization	2,220,206		2,098,298
Net property, plant and equipment	$	5,120,910	$	4,776,331