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Segmented information (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Results of Operations and Assets for Segments

			Year ended December 31, 2020
			Regulated Services Group						Renewable Energy Group						Corporate						Total
Revenue (1)(2)			$	1,405,136					$	270,398					$	1,524					$	1,677,058
Fuel, power and water purchased			384,363						16,645						—						401,008
Net revenue			1,020,773						253,753						1,524						1,276,050
Operating expenses			445,459						74,981						12						520,452
Administrative expenses			34,141						24,719						630						59,490
Depreciation and amortization			219,089						92,890						2,144						314,123
Gain on foreign exchange			—						—						(2,108)						(2,108)
Operating income			322,084						61,163						846						384,093
Interest expense			(99,161)						(52,656)						(30,117)						(181,934)
Income from long-term investments			7,753						96,652						560,266						664,671
Other			(40,128)						(6,537)						(27,754)						(74,419)
Earnings before income taxes			$	190,548					$	98,622					$	503,241					$	792,411
Property, plant and equipment			$	5,757,532					$	2,451,706					$	32,600					$	8,241,838
Investments carried at fair value			—						1,837,429						—						1,837,429
Equity-method investees			74,673						111,779						—						186,452
Total assets			8,528,172						4,589,521						106,213						13,223,906
Capital expenditures			$	690,792					$	80,746					$	14,492					$	786,030

(1) Renewable Energy Group revenue includes $28,586 related to net hedging gains from energy derivative contracts and availability credits for the year ended December 31, 2020 that do not represent revenue recognized from contracts with customers.

(2) Regulated Services Group revenue includes $24,928 related to alternative revenue programs for the year ended December 31, 2020 that do not represent revenue recognized from contracts with customers.

21.Segmented information (continued)

			Year ended December 31, 2019
			Regulated Services Group						Renewable Energy Group						Corporate						Total
Revenue (1)(2)			$	1,368,411					$	256,510					$	1,471					$	1,626,392
Fuel and power purchased			426,046						17,258						—						443,304
Net revenue			942,365						239,252						1,471						1,183,088
Operating expenses			397,092						74,676						221						471,989
Administrative expenses			36,667						19,366						769						56,802
Depreciation and amortization			194,766						88,557						981						284,304
Loss on foreign exchange			—						—						3,146						3,146
Operating income			313,840						56,653						(3,646)						366,847
Interest expense			(101,518)						(61,039)						(18,931)						(181,488)
Income from long-term investments			9,334						104,025						284,262						397,621
Other			(32,297)						15,951						(11,567)						(27,913)
Earnings before income taxes			$	189,359					$	115,590					$	250,118					$	555,067
Property, plant and equipment			$	4,763,689					$	2,444,382					$	32,909					$	7,240,980
Investments carried at fair value			27,072						1,267,075						—						1,294,147
Equity-method investees			29,827						52,284						—						82,111
Total assets			6,825,379						4,014,067						81,340						10,920,786
Capital expenditures			$	478,936					$	102,396					$	—					$	581,332

(1) Renewable Energy Group revenue includes $22,282 related to net hedging gains from energy derivative contracts for the year ended December 31, 2019 that do not represent revenue recognized from contracts with customers.

(2) Regulated Services Group revenue includes $(4,405) related to alternative revenue programs for the year ended December 31, 2019 that do not represent revenue recognized from contracts with customers.

Information on Operations by Geographic Area

Information on operations by geographic area is as follows:

															2020						2019
Revenue
United States															$	1,475,087					$	1,537,695
Canada															153,569						88,697
Other regions															48,402						—
															$	1,677,058					$	1,626,392
Property, plant and equipment
United States															$	6,666,015					$	6,488,964
Canada															884,195						752,016
Other regions															691,628						—
															$	8,241,838					$	7,240,980
Intangible assets
United States															$	24,825					$	23,821
Canada															23,123						23,795
Other regions															66,965						—
															$	114,913					$	47,616

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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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