Property, Plant And Equipment:

12 Months Ended

Dec. 31, 2021

PROPERTY, PLANT AND EQUIPMENT

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


	2021			2020			Lives (in years)
Electric Utilities	Property, Plant and Equipment		Weighted Average Useful Life (in years)	Property, Plant and Equipment		Weighted Average Useful Life (in years)	Minimum	Maximum

Electric plant:
Production	$	1,452,055	41	$	1,417,951	40	32	45
Electric transmission	546,126		49	517,794		49	43	50
Electric distribution	1,000,619		47	959,453		46	45	49
Integrated Generation	720,490		30	716,479		31	2	59
Plant acquisition adjustment (a)	4,870		32	4,870		32	32	32
General	266,935		28	259,010		28	25	31
Total electric plant in service	3,991,095			3,875,557
Construction work in progress	181,451			95,266
Total electric plant	4,172,546			3,970,823
Less accumulated depreciation and depletion	(1,016,738)			(960,993)
Electric plant net of accumulated depreciation and depletion	$	3,155,808		$	3,009,830

____________________

(a) The plant acquisition adjustment is included in rate base and is being recovered with 9 years remaining.


	2021			2020			Lives (in years)
Gas Utilities	Property, Plant and Equipment		Weighted Average Useful Life (in years)	Property, Plant and Equipment		Weighted Average Useful Life (in years)	Minimum	Maximum

Gas plant:
Production	$	14,841	40	$	15,603	40	24	46
Gas transmission	645,550		58	578,278		54	22	71
Gas distribution	2,394,352		53	2,115,082		53	45	59
Cushion gas - depreciable (a)	3,539		28	3,539		28	28	28
Cushion gas - not depreciable (a)	42,478		N/A	39,184		N/A	N/A	N/A
Storage	56,289		38	55,481		38	27	52
General	474,964		21	438,217		19	3	23
Total gas plant in service	3,632,013			3,245,384
Construction work in progress	37,860			67,229
Total gas plant	3,669,873			3,312,613
Less accumulated depreciation	(389,115)			(323,679)
Gas plant net of accumulated depreciation	$	3,280,758		$	2,988,934

____________________

(a) Depreciation of Cushion Gas is determined by the respective regulatory jurisdiction in which the Cushion Gas resides.


2021											Lives (in years)
	Property, Plant and Equipment		Construction Work in Progress		Total Property Plant and Equipment		Less Accumulated Depreciation		Net Property, Plant and Equipment		Weighted Average Useful Life	Minimum	Maximum
Corporate	$	5,694	$	8,460	$	14,154	$	(1,544)	$	12,610	10	10	22


2020											Lives (in years)
	Property, Plant and Equipment		Construction Work in Progress		Total Property Plant and Equipment		Less Accumulated Depreciation		Net Property, Plant and Equipment		Weighted Average Useful Life	Minimum	Maximum
Corporate	$	5,692	$	16,402	$	22,094	$	(1,144)	$	20,950	10	10	22