Property, Plant and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment at December 31 consisted of the following (dollars in thousands):

				2018				2017
				Weighted				Weighted
				Average				Average
	2018			Useful Life (in years)	2017			Useful Life (in years)
Electric plant:
Production	$	588,565		46	$	587,323		46
Transmission	208,610			48	186,045			49
Distribution	394,475			45	375,214			46
Plant acquisition adjustment (a)	4,870			32	4,870			32
General	154,621			28	153,535			32
Total plant-in-service	1,351,141				1,306,987
Construction work in progress	29,904				4,832
Total electric plant	1,381,045				1,311,819
Less accumulated depreciation and amortization	(376,160		)		(358,946		)
Electric plant net of accumulated depreciation and amortization	$	1,004,885			$	952,873

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(a) The plant acquisition adjustment is included in rate base and is being recovered with 12 years remaining.