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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Estimated Useful Lives of Depreciable Assets | The ranges of estimated useful lives and the weighted average useful lives are summarized below:
| Range of useful lives |  | Weighted average useful lives
| 2019 |  | 2018 |  | 2019 |  | 2018
Generation | 3 - 60 |  | 3 - 60 |  | 33 |  | 33
Distribution | 5 - 100 |  | 5 - 100 |  | 42 |  | 40
Equipment | 5 - 44 |  | 5 - 43 |  | 10 |  | 10
Schedule of Operating Leases Schedule | s. The Company's operating leases payments for the next five years and thereafter are as follows:
Year 1 |  | Year 2 |  | Year 3 |  | Year 4 |  | Year 5 |  | Thereafter |  | Total
$ | 2,115 |  |  | $ | 1,138 |  |  | $ | 688 |  |  | $ | 659 |  |  | $ | 642 |  |  | $ | 5,195 |  |  | $ | 10,437 |
The lease payments for the Company's finance leases are expected to be approximately $539 annually for the next five years, and $318 thereaf

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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