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Segmented information - Results of Operations and Assets for Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Revenue |  |  |  |  |
Revenue | $ 569,973 | $ 605,336 | $ 1,279,380 | $ 1,358,584 |
Other revenue | 598,626 | 627,871 | 1,335,726 | 1,406,498 |
Fuel, power and water purchased | 109,625 | 142,156 | 310,967 | 417,112 |
Net revenue | 489,001 | 485,715 | 1,024,759 | 989,386 |
Operating expenses (3) | 265,868 | 267,174 | 527,653 | 505,294 |
Depreciation and amortization | 136,912 | 118,448 | 266,452 | 240,089 |
Loss on foreign exchange | 4,284 | 6,379 | 16,141 | 7,815 |
Operating income | 81,937 | 93,714 | 214,513 | 236,188 |
Interest expense | (105,787) | (89,663) | (208,311) | (171,581) |
Income (loss) from long-term investments and other income | 198,641 | (277,696) | 50,887 | (57,684) |
Other expenses | (20,978) | (44,634) | (34,884) | (50,891) |
Earnings (loss) before income taxes | 153,813 | (318,279) | 22,205 | (43,968) |
Capital expenditures | 204,336 | 245,209 | 416,882 | 414,958 |
Property, plant and equipment | 13,199,200 |  | 13,199,200 |  | $ 12,517,450
Investments carried at fair value | 1,128,171 |  | 1,128,171 |  | 1,115,729
Equity-method investees | 352,983 |  | 352,983 |  | 456,393
Total assets | 18,866,374 |  | 18,866,374 |  | 18,373,961
Revenue related to net hedging loss, not recognized as revenue from contract with customers |  | 4,328 | 16,614 | 11,527 |
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers |  | 9,083 | 18,301 | 12,789 |
Other revenue |  |  |  |  |
Revenue |  |  |  |  |
Other revenue | 28,653 | 22,535 | 56,346 | 47,914 |
Corporate |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 0 | 0 | 0 | 0 |
Fuel, power and water purchased | 0 | 0 | 0 | 0 |
Net revenue | 195 | 364 | 605 | 725 |
Operating expenses (3) | 2,402 | (40) | 3,061 | 799 |
Depreciation and amortization | 239 | 403 | 500 | 642 |
Loss on foreign exchange | 4,284 | 6,379 | 16,141 | 7,815 |
Operating income | (6,730) | (6,378) | (19,097) | (8,531) |
Interest expense | (37,687) | (30,519) | (71,706) | (59,064) |
Income (loss) from long-term investments and other income | 173,518 | (309,870) | 15,821 | (129,928) |
Other expenses | (4,555) | (2,427) | (13,458) | (4,435) |
Earnings (loss) before income taxes | 124,546 | (349,194) | (88,440) | (201,958) |
Capital expenditures | 0 | 0 | 0 | 0 |
Corporate | Other revenue |  |  |  |  |
Revenue |  |  |  |  |
Other revenue | 195 | 364 | 605 | 725 |
Regulated Services Group |  |  |  |  |
Revenue |  |  |  |  |
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers | 15,334 |  |  |  |
Regulated Services Group | Operating Segments |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 491,312 | 533,642 | 1,116,143 | 1,208,174 |
Fuel, power and water purchased | 108,934 | 138,374 | 306,738 | 405,524 |
Net revenue | 396,318 | 408,059 | 835,094 | 829,088 |
Operating expenses (3) | 215,708 | 228,847 | 423,239 | 425,699 |
Depreciation and amortization | 100,120 | 84,754 | 192,140 | 170,611 |
Loss on foreign exchange | 0 | 0 | 0 | 0 |
Operating income | 80,490 | 94,458 | 219,715 | 232,778 |
Interest expense | (49,476) | (42,724) | (98,186) | (81,202) |
Income (loss) from long-term investments and other income | 7,456 | 9,332 | 15,377 | 19,660 |
Other expenses | (8,537) | (41,010) | (12,228) | (45,259) |
Earnings (loss) before income taxes | 29,933 | 20,056 | 124,678 | 125,977 |
Capital expenditures | 167,834 | 225,505 | 351,048 | 372,886 |
Property, plant and equipment | 9,051,366 |  | 9,051,366 |  | 8,945,637
Investments carried at fair value | 1,905 |  | 1,905 |  | 1,962
Equity-method investees | 39,012 |  | 39,012 |  | 112,180
Total assets | 12,690,910 |  | 12,690,910 |  | 12,658,955
Regulated Services Group | Operating Segments | Other revenue |  |  |  |  |
Revenue |  |  |  |  |
Other revenue | 13,940 | 12,791 | 25,689 | 26,438 |
Renewable Energy Group |  |  |  |  |
Revenue |  |  |  |  |
Revenue related to net hedging loss, not recognized as revenue from contract with customers | 6,965 |  |  |  |
Development costs | 7,734 | 3,274 | 16,290 | 7,261 |
Other operating costs | 6,709 | 7,356 | 12,738 | 11,088 |
Renewable Energy Group | Operating Segments |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 78,661 | 71,694 | 163,237 | 150,410 |
Fuel, power and water purchased | 691 | 3,782 | 4,229 | 11,588 |
Net revenue | 92,488 | 77,292 | 189,060 | 159,573 |
Operating expenses (3) | 47,758 | 38,367 | 101,353 | 78,796 |
Depreciation and amortization | 36,553 | 33,291 | 73,812 | 68,836 |
Loss on foreign exchange | 0 | 0 | 0 | 0 |
Operating income | 8,177 | 5,634 | 13,895 | 11,941 |
Interest expense | (18,624) | (16,420) | (38,419) | (31,315) |
Income (loss) from long-term investments and other income | 17,667 | 22,842 | 19,689 | 52,584 |
Other expenses | (7,886) | (1,197) | (9,198) | (1,197) |
Earnings (loss) before income taxes | (666) | 10,859 | (14,033) | 32,013 |
Capital expenditures | 36,502 | 19,704 | 65,834 | 42,072 |
Property, plant and equipment | 4,120,034 |  | 4,120,034 |  | 3,539,069
Investments carried at fair value | 1,126,266 |  | 1,126,266 |  | 1,113,767
Equity-method investees | 313,971 |  | 313,971 |  | 343,712
Total assets | 5,809,815 |  | 5,809,815 |  | 5,367,011
Renewable Energy Group | Operating Segments | Other revenue |  |  |  |  |
Revenue |  |  |  |  |
Other revenue | 14,518 | $ 9,380 | 30,052 | $ 20,751 |
Corporate | Corporate |  |  |  |  |
Revenue |  |  |  |  |
Property, plant and equipment | 27,800 |  | 27,800 |  | 32,744
Investments carried at fair value | 0 |  | 0 |  | 0
Equity-method investees | 0 |  | 0 |  | 501
Total assets | $ 365,649 |  | $ 365,649 |  | $ 347,995

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