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Segmented information - Schedule of Results of Operations and Assets for Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Revenue |  |
Revenue | $ 2,263,970 | $ 2,350,044
Other revenue | 2,319,538 | 2,403,924
Fuel, power, water purchased and other cost of sales | 594,329 | 743,504
Net revenue | 1,725,209 | 1,660,420
Operating expenses | 879,950 | 823,914
Depreciation and amortization | 395,687 | 354,079
Asset impairment charge | 0 | 1,481
Loss on foreign exchange | 3,483 | 13,659
Operating income | 446,089 | 467,287
Interest expense | (363,576) | (308,440)
Income from long-term investments | 134,897 | (83,935)
Other expenses | (40,230) | (137,027)
Earnings (loss) before income taxes | 177,180 | (62,115)
Property, plant and equipment | 9,450,095 | 9,126,773
Investments carried at fair value | 2,058 | 1,054,665
Equity-method investees | 38,113 | 112,680
Total assets | 13,266,121 | 14,186,996
Capital expenditures | 763,830 | 748,659
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers | 30,396 | 32,839
Other revenue |  |
Revenue |  |
Other revenue | 55,568 | 53,880
Corporate Group |  |
Revenue |  |
Revenue | 0 | 0
Fuel, power, water purchased and other cost of sales | 0 | 0
Net revenue | 1,421 | 1,447
Operating expenses | 9,357 | 3,990
Depreciation and amortization | 1,763 | 1,232
Asset impairment charge |  | 1,481
Loss on foreign exchange | 3,483 | 13,659
Operating income | (13,182) | (18,915)
Interest expense | (170,928) | (146,264)
Income from long-term investments | 101,434 | (128,891)
Other expenses | (7,964) | (10,610)
Earnings (loss) before income taxes | (90,640) | (304,680)
Property, plant and equipment | 28,971 | 34,751
Investments carried at fair value | 0 | 1,052,703
Equity-method investees | 0 | 500
Total assets | 185,902 | 1,387,161
Capital expenditures | 1,000 | 1,232
Corporate Group | Other revenue |  |
Revenue |  |
Other revenue | 1,421 | 1,447
Regulated Services Group | Operating Segments |  |
Revenue |  |
Revenue | 2,228,642 | 2,315,722
Fuel, power, water purchased and other cost of sales | 594,116 | 742,974
Net revenue | 1,687,881 | 1,623,885
Operating expenses | 861,758 | 811,359
Depreciation and amortization | 387,162 | 346,188
Asset impairment charge |  | 0
Loss on foreign exchange | 0 | 0
Operating income | 438,961 | 466,338
Interest expense | (191,733) | (160,999)
Income from long-term investments | 33,444 | 44,953
Other expenses | (32,275) | (121,146)
Earnings (loss) before income taxes | 248,397 | 229,146
Property, plant and equipment | 9,284,365 | 8,945,637
Investments carried at fair value | 2,058 | 1,962
Equity-method investees | 38,113 | 112,180
Total assets | 12,927,864 | 12,658,955
Capital expenditures | 756,230 | 740,768
Regulated Services Group | Operating Segments | Other revenue |  |
Revenue |  |
Other revenue | 53,355 | 51,137
Regulated Services Group | Operating Segments |  |
Revenue |  |
Revenue | 35,328 | 34,322
Fuel, power, water purchased and other cost of sales | 213 | 530
Net revenue | 35,907 | 35,088
Operating expenses | 8,835 | 8,565
Depreciation and amortization | 6,762 | 6,659
Asset impairment charge |  | 0
Loss on foreign exchange | 0 | 0
Operating income | 20,310 | 19,864
Interest expense | (915) | (1,177)
Income from long-term investments | 19 | 3
Other expenses | 9 | (5,271)
Earnings (loss) before income taxes | 19,423 | 13,419
Property, plant and equipment | 136,759 | 146,385
Investments carried at fair value | 0 | 0
Equity-method investees | 0 | 0
Total assets | 152,355 | 140,880
Capital expenditures | 6,600 | 6,659
Regulated Services Group | Operating Segments | Other revenue |  |
Revenue |  |
Other revenue | $ 792 | $ 1,296

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