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Income taxes - Schedule of Tax Effect on Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Deferred tax assets: |  |  |
Non-capital loss, investment tax credits, currently non-deductible interest expenses, and financing costs | $ 781,761 | $ 714,476 |
Outside basis in renewable energy assets | 140,203 | 0 |
Pension and OPEB | 515 | 7,327 |
Environmental obligation | 9,161 | 8,821 |
Regulatory liabilities | 164,402 | 180,371 |
Other | 57,680 | 51,333 |
Total deferred income tax assets | 1,153,722 | 962,328 |
Less: valuation allowance | (281,894) | (5,562) | $ (5,876)
Total deferred tax assets | 871,828 | 956,766 |
Deferred tax liabilities: |  |  |
Property, plant and equipment | 866,529 | 810,025 |
Pension and OPEB | 9,148 | 0 |
Outside basis differentials | 165,010 | 191,990 |
Regulatory accounts | 329,343 | 317,829 |
Other | 67,753 | 51,610 |
Total deferred tax liabilities | 1,437,783 | 1,371,454 |
Net deferred tax liabilities | (565,955) | (414,688) |
Deferred tax assets | 11,218 | 151,576 |
Deferred tax liabilities | $ (577,173) | $ (566,264) |

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