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Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

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


	2022		2021
Utility plant in service	$	7,561,688	$	7,166,580
Construction work in progress		164,147		205,405
Total		7,725,835		7,371,985
Less: Accumulated depreciation and amortization		2,281,126		2,146,470
Total net utility property	$	5,444,709	$	5,225,515

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:


	2022			2021			2020
Avista Utilities
Ratio of depreciation to average depreciable property		3.50	%		3.54	%		3.43	%
Alaska Electric Light and Power Company
Ratio of depreciation to average depreciable property		2.78	%		2.77	%		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		39		39
Natural gas distribution property		44	N/A
Other shorter-lived general plant		8		19

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):


	2022		2021
Avista Utilities:
Electric production	$	1,593,795	$	1,494,371
Electric transmission		994,709		945,624
Electric distribution		2,236,376		2,093,937
Electric construction work-in-progress (CWIP) and other		376,981		424,733
Electric total		5,201,861		4,958,665
Natural gas underground storage		58,072		55,684
Natural gas distribution		1,452,637		1,356,477
Natural gas CWIP and other		88,264		87,852
Natural gas total		1,598,973		1,500,013
Common plant (including CWIP)		744,173		740,339
Total Avista Utilities		7,545,007		7,199,017
AEL&P:
Electric production		106,390		106,094
Electric transmission		22,856		22,691
Electric distribution		29,269		27,138
Electric CWIP and other		12,295		7,319
Electric total		170,810		163,242
Common plant		10,018		9,726
Total AEL&P		180,828		172,968
Total gross utility property		7,725,835		7,371,985
Other (1)		16,631		17,818
Total	$	7,742,466	$	7,389,803

(1)

Included in other property and investments-net and other non-current assets on the Consolidated Balance Sheets. Accumulated depreciation was $2.4 million as of December 31, 2022 and $2.3 million as of December 31, 2021 for the other businesses.