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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Schedule of 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
| 2024 |  | 2023 |  | 2024 |  | 2023
Utility plant | 1-100 |  | 1-100 |  | 41 |  | 40
Hydro: generation facilities and other | 5-60 |  | 5-60 |  | 35 |  | 35

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