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Utility Plant and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Utility Plant and Intangible Assets |
Schedule of Registrant's utility plant utilized in continuing operations by major asset class | The following table shows Registrant’s utility plant by major asset class:
|  | AWR December 31, |  | GSWC December 31,
(dollars in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Water |  |  |  |  |  |  |  |
Land |  | $ | 14,895 |  |  | $ | 15,393 |  |  | $ | 14,895 |  |  | $ | 15,393 |
Intangible assets |  | 29,396 |  |  | 36,291 |  |  | 29,378 |  |  | 36,273 |
Source of water supply |  | 88,168 |  |  | 86,775 |  |  | 88,168 |  |  | 86,775 |
Pumping |  | 178,252 |  |  | 169,983 |  |  | 178,252 |  |  | 169,983 |
Water treatment |  | 78,999 |  |  | 74,980 |  |  | 78,999 |  |  | 74,980 |
Transmission and distribution |  | 1,064,271 |  |  | 1,014,925 |  |  | 1,064,271 |  |  | 1,014,925 |
Other |  | 120,820 |  |  | 127,969 |  |  | 105,246 |  |  | 116,090 |
|  | 1,574,801 |  |  | 1,526,316 |  |  | 1,559,209 |  |  | 1,514,419 |
Electric |  |  |  |  |  |  |  |
Transmission and distribution |  | 76,188 |  |  | 71,112 |  |  | 76,188 |  |  | 71,112 |
Generation |  | 12,583 |  |  | 12,583 |  |  | 12,583 |  |  | 12,583 |
Other (1) |  | 10,955 |  |  | 10,314 |  |  | 10,955 |  |  | 10,314 |
|  | 99,726 |  |  | 94,009 |  |  | 99,726 |  |  | 94,009 |
Less — accumulated depreciation |  | (533,370 | ) |  | (532,753 | ) |  | (524,481 | ) |  | (524,927 | )
Construction work in progress |  | 63,835 |  |  | 63,354 |  |  | 63,486 |  |  | 61,810 |
Net utility plant |  | $ | 1,204,992 |  |  | $ | 1,150,926 |  |  | $ | 1,197,940 |  |  | $ | 1,145,311 |
(1) Includes intangible assets of $1.2 million for the years ended December 31, 2017 and 2016 for studies performed in association with the electricity segment of the Registrant’s operations.
Schedule of components of intangible assets | As of December 31, 2017 and 2016, intangible assets consist of the following:
|  | Weighted Average Amortization |  | AWR December 31, |  | GSWC December 31,
(dollars in thousands) |  | Period |  | 2017 |  | 2016 |  | 2017 |  | 2016
Intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conservation programs |  | 3 years |  | $ | 9,486 |  |  | $ | 9,496 |  |  | $ | 9,486 |  |  | $ | 9,496 |
Water and service rights (2) |  | 30 years |  | 8,695 |  |  | 8,695 |  |  | 8,124 |  |  | 8,124 |
Water planning studies |  | 14 years |  | 13,011 |  |  | 19,487 |  |  | 13,011 |  |  | 19,487 |
Total intangible assets |  |  |  | 31,192 |  |  | 37,678 |  |  | 30,621 |  |  | 37,107 |
Less — accumulated amortization |  |  |  | (23,331 | ) |  | (28,108 | ) |  | (23,221 | ) |  | (28,001 | )
Intangible assets, net of amortization |  |  |  | $ | 7,861 |  |  | $ | 9,570 |  |  | $ | 7,400 |  |  | $ | 9,106 |
Intangible assets not subject to amortization (3) |  |  |  | $ | 422 |  |  | $ | 427 |  |  | $ | 404 |  |  | $ | 409 |
(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, 2017 and 2016. (3) The intangible assets not subject to amortization primarily consist of organization and consent fees.
Schedule of estimated future consolidated amortization expenses related to intangible assets | Estimated future consolidated amortization expenses related to intangible assets for the succeeding five years are (in thousands):
|  | Amortization Expense
2018 |  | $ | 1,325 |
2019 |  | 1,131 |
2020 |  | 1,003 |
2021 |  | 949 |
2022 |  | 949 |
Total |  | $ | 5,357 |
Schedule of reconciliation of the beginning and ending aggregate carrying amount of the 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, 2017 and 2016:
(dollars in thousands) |  | GSWC
Obligation at December 31, 2015 |  | $ | 4,157 |
Additional liabilities incurred |  | 121 |
Liabilities settled |  | (112 | )
Accretion |  | 227 |
Obligation at December 31, 2016 |  | $ | 4,393 |
Additional liabilities incurred |  | 562 |
Liabilities settled |  | (229 | )
Accretion |  | 237 |
Obligation at December 31, 2017 |  | $ | 4,963 |

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