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Segmented information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of Results of Operations and Assets for Segments

			Year ended December 31, 2023
			Regulated Services Group						Renewable Energy Group						Corporate						Total
Revenue (1)(2)			$	2,315,722					$	296,314					$	—					$	2,612,036
Other revenue			51,137						33,395						1,447						85,979
Fuel, power and water purchased			716,446						19,499						—						735,945
Net revenue			1,650,413						310,210						1,447						1,962,070
Operating expenses			786,608						119,013						1,364						906,985
Administrative expenses			46,386						36,554						7,419						90,359
Depreciation and amortization			346,188						119,576						1,232						466,996
Asset impairment charge			—						23,492						—						23,492
Loss on foreign exchange			—						—						8,359						8,359
Operating income (loss)			471,231						11,575						(16,927)						465,879
Interest expense			(160,998)						(61,261)						(131,397)						(353,656)
Income (loss) from long-term investments			44,953						102,188						(230,705)						(83,564)
Other expenses			(121,146)						(4,002)						(23,116)						(148,264)
Earnings (loss) before income taxes			$	234,040					$	48,500					$	(402,145)					$	(119,605)
Property, plant and equipment			$	8,945,637					$	3,539,069					$	32,744					$	12,517,450
Investments carried at fair value			1,962						1,113,767						—						1,115,729
Equity-method investees			112,180						343,712						501						456,393
Total assets			12,658,955						5,367,011						347,995						18,373,961
Capital expenditures			$	816,788					$	209,383					$	—					$	1,026,171

(1) Renewable Energy Group revenue includes $5,695 related to net hedging gain from energy derivative contracts and availability credits for the year ended December 31, 2023 that do not represent revenue recognized from contracts with customers.

(2) Regulated Services Group revenue includes $32,839 related to alternative revenue programs for the year ended December 31, 2023 that do not represent revenue recognized from contracts with customers.

21.Segmented information (continued)

			Year ended December 31, 2022
			Regulated Services Group						Renewable Energy Group						Corporate						Total
Revenue (1)(2)			$	2,330,039					$	350,797					$	—					$	2,680,836
Other revenue			54,229						28,447						1,501						84,177
Fuel and power purchased			824,670						41,684						—						866,354
Net revenue			1,559,598						337,560						1,501						1,898,659
Operating expenses			736,515						114,463						511						851,489
Administrative expenses			46,484						26,424						7,324						80,232
Depreciation and amortization			317,300						137,203						1,017						455,520
Asset impairment charge			—						159,568						—						159,568
Loss on foreign exchange			—						—						13,833						13,833
			459,299						(100,098)						(21,184)						338,017
Gain on sale of renewable assets			—						64,028						—						64,028
Operating income (loss)			459,299						(36,070)						(21,184)						402,045
Interest expense			(113,482)						(64,285)						(100,807)						(278,574)
Income (loss) from long-term investments			21,884						15,254						(502,344)						(465,206)
Other expenses			(14,765)						(570)						(12,598)						(27,933)
Earnings (loss) before income taxes			$	352,936					$	(85,671)					$	(636,933)					$	(369,668)
Property, plant and equipment			$	8,554,938					$	3,360,687					$	29,260					$	11,944,885
Investments carried at fair value			1,984						1,342,223						—						1,344,207
Equity-method investees			56,199						310,103						15,500						381,802
Total assets			12,109,575						5,251,933						266,105						17,627,613
Capital expenditures			$	908,676					$	180,348					$	—					$	1,089,024

(1) Renewable Energy Group revenue includes $63,717 related to net hedging loss from energy derivative contracts for the year ended December 31, 2022 that do not represent revenue recognized from contracts with customers.

(2) Regulated Services Group revenue includes $21,640 related to alternative revenue programs for the year ended December 31, 2022 that do not represent revenue recognized from contracts with customers.

Schedule of Information on Operations by Geographic Area

Information on operations by geographic area is as follows:

															2023						2022
Revenue
United States															$	2,169,239					$	2,232,817
Canada															162,740						175,005
Other regions															366,036						357,191
															$	2,698,015					$	2,765,013
Property, plant and equipment
United States															$	10,826,738					$	10,351,736
Canada															924,389						848,560
Other regions															766,323						744,589
															$	12,517,450					$	11,944,885
Intangible assets
United States															$	18,666					$	18,818
Canada															18,111						19,038
Other regions															57,161						58,827
															$	93,938					$	96,683

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Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries.

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