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Consolidated Statements of Earnings (Loss) - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Profit or loss [abstract]      
Revenues $ 2,721 $ 2,101 $ 2,347
Fuel and purchased power 1,054 805 881
Carbon compliance 178 163 205
Gross margin 1,489 1,133 1,261
Operations, maintenance, and administration 511 472 475
Depreciation and amortization 529 654 590
Asset impairment charge 648 84 25
Gain on termination of Keephills 3 coal rights contract 0 0 (88)
Taxes, other than income taxes 32 33 29
Termination of Sundance B and C PPAs 0 0 (56)
Net other operating loss (income) 8 (11) (49)
Operating income (loss) (239) (99) 335
Equity income 9 1 0
Finance lease income 25 7 6
Net interest expense (245) (238) (179)
Foreign exchange gain (loss) 16 17 (15)
Gain on sale of assets and other (Note 4 and 18) 54 9 46
Earnings (loss) before income taxes (380) (303) 193
Income tax expense (recovery) 45 (50) 17
Net earnings (loss) (425) (253) 176
Net earnings (loss) attributable to:      
TransAlta shareholders (537) (287) 82
Non-controlling interests (Note 12) 112 34 94
Net earnings (loss) (425) (253) 176
Preferred share dividends (Note 25) 39 49 30
Net earnings (loss) attributable to common shareholders $ (576) $ (336) $ 52
Weighted average number of common shares outstanding in the year (in shares) 271,000 275,000 283,000
Net earnings (loss) per share attributable to common shareholders, basic (in CAD per share) $ (2.13) $ (1.22) $ 0.18
Net earnings (loss) per share attributable to common shareholders, diluted (in CAD per share) $ (2.13) $ (1.22) $ 0.18