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Prepaid expenses | 12 Months Ended
--- | ---
Dec. 31, 2020
Prepaid expenses |
Prepaid expenses | 9. Prepaid expenses (a)This caption is made up as follows:
|  | 2020 |  | 2019
|  | US$(000) |  | US$(000)
Prepaid energy services(b) |  | 25,692 |  | 26,582
Prepaid insurance |  | 15,794 |  | 13,568
Deferred costs of works for taxes |  | 4,855 |  | 4,138
Other prepaid expenses |  | 4,174 |  | 2,373
|  | 50,515 |  | 46,661
Classification by maturity: |  |  |  |
Current portion |  | 25,709 |  | 20,969
Non-current portion |  | 24,806 |  | 25,692
|  | 50,515 |  | 46,661
(b)Corresponds mainly to payments made in advance to EDEGEL for an original amount of US$31,007,190 corresponding to the right to use the capacity of the hydraulic system of EDEGEL by the subsidiary Empresa de Generación Huanza S.A. This prepayment is being charged to results during the life of the underlying assets (35 years) since January 2015.

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- Definition The disclosure of prepayments and other assets. [Refer: Other assets; Prepayments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_10_e&doctype=Standard -URIDate 2020-01-01 + Details
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