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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2020
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
| 2020 |  | 2019 |  | 2020 |  | 2019
Generation | 3 - 60 |  | 3 - 60 |  | 33 |  | 33
Distribution | 1 - 100 |  | 5 - 100 |  | 40 |  | 42
Equipment | 5 - 50 |  | 5 - 44 |  | 11 |  | 10

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