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v3.21.1

Segmented information - Results of Operations and Assets for Segments (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenue |  |
Revenue | $ 1,677,058 | $ 1,626,392
Fuel, power and water purchased | 401,008 | 443,304
Net revenue | 1,276,050 | 1,183,088
Operating expenses | 520,452 | 471,989
Administrative expenses | 59,490 | 56,802
Depreciation and amortization | 314,123 | 284,304
Gain (loss) on foreign exchange | (2,108) | 3,146
Operating income | 384,093 | 366,847
Interest expense | (181,934) | (181,488)
Income from long-term investments | 664,671 | 397,621
Other | (74,419) | (27,913)
Earnings before income taxes | 792,411 | 555,067
Property, plant and equipment | 8,241,838 | 7,240,980
Investments carried at fair value | 1,837,429 | 1,294,147
Equity-method investees | 186,452 | 82,111
Total assets | 13,223,906 | 10,920,786
Capital expenditures | 786,030 | 581,332
Revenue related to net hedging gains, not recognized as revenue from contract with customers | 28,586 | 22,282
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers | 24,928 | (4,405)
Regulated Services Group |  |
Revenue |  |
Revenue | 1,405,136 | 1,368,411
Fuel, power and water purchased | 384,363 | 426,046
Net revenue | 1,020,773 | 942,365
Operating expenses | 445,459 | 397,092
Administrative expenses | 34,141 | 36,667
Depreciation and amortization | 219,089 | 194,766
Gain (loss) on foreign exchange | 0 | 0
Operating income | 322,084 | 313,840
Interest expense | (99,161) | (101,518)
Income from long-term investments | 7,753 | 9,334
Other | (40,128) | (32,297)
Earnings before income taxes | 190,548 | 189,359
Property, plant and equipment | 5,757,532 | 4,763,689
Investments carried at fair value | 0 | 27,072
Equity-method investees | 74,673 | 29,827
Total assets | 8,528,172 | 6,825,379
Capital expenditures | 690,792 | 478,936
Renewable Energy Group |  |
Revenue |  |
Revenue | 270,398 | 256,510
Fuel, power and water purchased | 16,645 | 17,258
Net revenue | 253,753 | 239,252
Operating expenses | 74,981 | 74,676
Administrative expenses | 24,719 | 19,366
Depreciation and amortization | 92,890 | 88,557
Gain (loss) on foreign exchange | 0 | 0
Operating income | 61,163 | 56,653
Interest expense | (52,656) | (61,039)
Income from long-term investments | 96,652 | 104,025
Other | (6,537) | 15,951
Earnings before income taxes | 98,622 | 115,590
Property, plant and equipment | 2,451,706 | 2,444,382
Investments carried at fair value | 1,837,429 | 1,267,075
Equity-method investees | 111,779 | 52,284
Total assets | 4,589,521 | 4,014,067
Capital expenditures | 80,746 | 102,396
Corporate |  |
Revenue |  |
Revenue | 1,524 | 1,471
Fuel, power and water purchased | 0 | 0
Net revenue | 1,524 | 1,471
Operating expenses | 12 | 221
Administrative expenses | 630 | 769
Depreciation and amortization | 2,144 | 981
Gain (loss) on foreign exchange | (2,108) | 3,146
Operating income | 846 | (3,646)
Interest expense | (30,117) | (18,931)
Income from long-term investments | 560,266 | 284,262
Other | (27,754) | (11,567)
Earnings before income taxes | 503,241 | 250,118
Property, plant and equipment | 32,600 | 32,909
Investments carried at fair value | 0 | 0
Equity-method investees | 0 | 0
Total assets | 106,213 | 81,340
Capital expenditures | $ 14,492 | $ 0

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