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Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Net utility property consisted of the following as of December 31 (dollars in thousands):


	2023		2022
Utility plant in service	$	7,799,481	$	7,561,688
Construction work in progress		179,527		164,147
Total		7,979,008		7,725,835
Less: Accumulated depreciation and amortization		2,278,952		2,281,126
Total net utility property	$	5,700,056	$	5,444,709

Summary of Ratio of Depreciation to Average Depreciable Property and Average Service Lives for Utility Plan in Service

For utility operations, the ratio of depreciation provisions to average depreciable property was as follows for the years ended December 31:


	2023			2022			2021
Avista Utilities		3.52	%		3.50	%		3.54	%
Alaska Electric Light and Power Company		2.78	%		2.78	%		2.77	%

The average service lives for the following broad categories of utility plant in service are (in years):


	Avista Utilities		Alaska Electric Light and Power Company
Electric thermal/other production		26		41
Hydroelectric production		79		42
Electric transmission		50		43
Electric distribution		40		39
Natural gas distribution property		44	N/A
Other shorter-lived general plant		8		18

The gross balances of the major classifications of property, plant and equipment are detailed in the following table as of December 31 (dollars in thousands):


	2023		2022
Avista Utilities:
Electric production	$	1,498,398	$	1,593,795
Electric transmission		1,059,389		994,709
Electric distribution		2,383,201		2,236,376
Electric construction work-in-progress (CWIP) and other		394,711		376,981
Electric total		5,335,699		5,201,861
Natural gas underground storage		59,994		58,072
Natural gas distribution		1,539,467		1,452,637
Natural gas CWIP and other		91,492		88,264
Natural gas total		1,690,953		1,598,973
Common plant (including CWIP)		759,498		744,173
Total Avista Utilities		7,786,150		7,545,007
AEL&P:
Electric production		118,817		106,390
Electric transmission		22,827		22,856
Electric distribution		32,322		29,269
Electric CWIP and other		8,552		12,295
Electric total		182,518		170,810
Common plant		10,340		10,018
Total AEL&P		192,858		180,828
Total gross utility property		7,979,008		7,725,835
Other (1)		6,425		16,631
Total	$	7,985,433	$	7,742,466

(1)

Included in other property and investments-net and other non-current assets on the Consolidated Balance Sheets. Accumulated depreciation was less than $0.1 million as of December 31, 2023 and $2.4 million as of December 31, 2022 for the other businesses.