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Utility Plant and Intangible Assets
 12 Months Ended
Dec. 31, 2023
Utility Plant and Intangible Assets  
Utility Plant and Intangible Assets Utility Plant and Intangible Assets
The following table shows Registrant’s utility plant (regulated utility plant and non-regulated utility property) by major asset class:
AWR
December 31,		GSWC
December 31,
(dollars in thousands)2023202220232022
Water
Land$18,290 $18,427 $18,290 $18,427 
Intangible assets30,917 30,511 30,917 30,511 
Source of water supply111,112 109,918 111,112 109,918 
Pumping234,264 227,668 234,264 227,668 
Water treatment98,533 90,411 98,533 90,411 
Transmission and distribution1,489,974 1,431,437 1,489,974 1,431,437 
Other140,060 136,162 99,837 98,096 
2,123,150 2,044,534 2,082,927 2,006,468 
Electric
Transmission and distribution126,143 105,499 — — 
Generation12,583 12,583 — — 
Other (1)
17,745 15,733 — — 
156,471 133,815 — — 
Less — accumulated depreciation(624,472)(606,231)(543,135)(530,925)
Construction work in progress237,131 181,648 195,742 141,175 
Net utility plant$1,892,280 $1,753,766 $1,735,534 $1,616,718 
(1)     Includes intangible assets of $1.2 million for the years ended December 31, 2023 and 2022 for studies performed.
As of December 31, 2023 and 2022, intangible assets consist of the following:
 
Weighted Average
 Amortization 
AWR
 December 31,
GSWC
 December 31,
(dollars in thousands)Period2023202220232022
Intangible assets:
     
Conservation programs3 years$9,486 $9,486 $9,486 $9,486 
Water and service rights (2)
30 years8,695 8,695 8,124 8,124 
Water planning studies14 years14,164 13,757 12,926 12,519 
Total intangible assets 32,345 31,938 30,536 30,129 
Less — accumulated amortization (27,275)(26,811)(26,294)(25,374)
Intangible assets, net of amortization $5,070 $5,127 $4,242 $4,755 
Intangible assets not subject to amortization (3)
 $383 $383 $382 $382 
(2)    Includes intangible assets of $571,000 for contracted services included in “Other Property and Investments” on the consolidated balance sheets as of December 31, 2023 and 2022.
(3)      The intangible assets not subject to amortization primarily consist of organization and consent fees.
For the years ended December 31, 2023, 2022 and 2021, amortization of intangible assets was $1.1 million, $641,000 and $700,000, respectively, for both AWR and GSWC. 
Estimated future consolidated amortization expense related to intangible assets are as follows (in thousands):
 Amortization
Expense
2024$911 
2025911 
2026911 
2027911 
2028911 
Total$4,555 
Asset Retirement Obligations:
The following is a reconciliation of the beginning and ending aggregate carrying amount of asset retirement obligations, which are included in “Other Credits” on the balance sheets as of December 31, 2023 and 2022:
(dollars in thousands)GSWC
Obligation at December 31, 2021$9,717 
Accretion386 
Obligation at December 31, 2022$10,103 
Accretion406 
Obligation at December 31, 2023$10,509