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Utility Plant and Intangible Assets | 12 Months Ended
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Dec. 31, 2019
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) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Water |  |  |  |  |  |  |  |
Land |  | $ | 18,066 |  |  | $ | 14,890 |  |  | $ | 18,066 |  |  | $ | 14,890 |
Intangible assets |  | 28,578 |  |  | 29,412 |  |  | 28,578 |  |  | 29,413 |
Source of water supply |  | 91,685 |  |  | 91,349 |  |  | 91,685 |  |  | 91,349 |
Pumping |  | 178,058 |  |  | 182,673 |  |  | 178,058 |  |  | 182,673 |
Water treatment |  | 78,048 |  |  | 82,198 |  |  | 78,048 |  |  | 82,198 |
Transmission and distribution |  | 1,219,285 |  |  | 1,142,105 |  |  | 1,219,285 |  |  | 1,142,105 |
Other |  | 117,276 |  |  | 131,419 |  |  | 86,722 |  |  | 106,907 |
|  | 1,730,996 |  |  | 1,674,046 |  |  | 1,700,442 |  |  | 1,649,535 |
Electric |  |  |  |  |  |  |  |
Transmission and distribution |  | 84,018 |  |  | 82,257 |  |  | 84,018 |  |  | 82,257 |
Generation |  | 12,583 |  |  | 12,583 |  |  | 12,583 |  |  | 12,583 |
Other (1) |  | 11,824 |  |  | 11,224 |  |  | 11,824 |  |  | 11,224 |
|  | 108,425 |  |  | 106,064 |  |  | 108,425 |  |  | 106,064 |
Less — accumulated depreciation |  | (543,263 | ) |  | (561,855 | ) |  | (531,801 | ) |  | (551,244 | )
Construction work in progress |  | 119,547 |  |  | 78,055 |  |  | 117,676 |  |  | 76,737 |
Net utility plant |  | $ | 1,415,705 |  |  | $ | 1,296,310 |  |  | $ | 1,394,742 |  |  | $ | 1,281,092 |
(1) Includes intangible assets of $1.2 million for the years ended December 31, 2019 and 2018 for studies performed in association with the electricity segment of the Registrant’s operations. As of December 31, 2019 and 2018, intangible assets consist of the following:
|  | Weighted Average Amortization |  | AWR December 31, |  | GSWC December 31,
(dollars in thousands) |  | Period |  | 2019 |  | 2018 |  | 2019 |  | 2018
Intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conservation programs |  | 3 years |  | $ | 9,486 |  |  | $ | 9,486 |  |  | $ | 9,486 |  |  | $ | 9,486 |
Water and service rights (2) |  | 30 years |  | 8,695 |  |  | 8,695 |  |  | 8,124 |  |  | 8,124 |
Water planning studies |  | 14 years |  | 11,808 |  |  | 12,641 |  |  | 11,808 |  |  | 12,641 |
Total intangible assets |  |  |  | 29,989 |  |  | 30,822 |  |  | 29,418 |  |  | 30,251 |
Less — accumulated amortization |  |  |  | (24,309 | ) |  | (24,399 | ) |  | (24,166 | ) |  | (24,268 | )
Intangible assets, net of amortization |  |  |  | $ | 5,680 |  |  | $ | 6,423 |  |  | $ | 5,252 |  |  | $ | 5,983 |
Intangible assets not subject to amortization (3) |  |  |  | $ | 402 |  |  | $ | 422 |  |  | $ | 402 |  |  | $ | 404 |
(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, 2019 and 2018. (3) The intangible assets not subject to amortization primarily consist of organization and consent fees. For the years ended December 31, 2019, 2018 and 2017, amortization of intangible assets was $1.3 million, $1.1 million and $1.5 million, respectively, for both AWR and GSWC. Estimated future consolidated amortization expenses related to intangible assets for the succeeding five years are (in thousands):
|  | Amortization Expense
2020 |  | $ | 90 |
2021 |  | 12 |
2022 |  | 12 |
2023 |  | 12 |
2024 |  | 12 |
Total |  | $ | 138 |
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, 2019 and 2018:
(dollars in thousands) |  | GSWC
Obligation at December 31, 2017 |  | $ | 4,963 |
Additional liabilities incurred |  | 256 |
Liabilities settled |  | (46 | )
Accretion |  | 55 |
Obligation at December 31, 2018 |  | $ | 5,228 |
Additional liabilities incurred |  | 271 |
Liabilities settled |  | (173 | )
Accretion |  | 86 |
Revision of previous estimates |  | 3,451 |
Obligation at December 31, 2019 |  | $ | 8,863 |
Revision of previous estimates reflect updated estimated costs for the retirement of wells, which GSWC is legally required to cap at the time of removal. Wells have an estimated useful life of 50 years.

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