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Consolidated Statements of Earnings (Loss) - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Profit or loss [abstract]      
Revenues $ 2,976 $ 2,721 $ 2,101
Fuel and purchased power 1,263 1,054 805
Carbon compliance 78 178 163
Gross margin 1,635 1,489 1,133
Operations, maintenance, and administration 521 511 472
Depreciation and amortization 599 529 654
Asset impairment charges 9 648 84
Taxes, other than income taxes 33 32 33
Net other operating (income) loss (58) 8 (11)
Operating income (loss) 531 (239) (99)
Equity income (loss) 9 9 1
Finance lease income 19 25 7
Net interest expense (262) (245) (238)
Foreign exchange gain 4 16 17
Gain on sale of assets and other 52 54 9
Earnings (loss) before income taxes 353 (380) (303)
Income tax expense (recovery) 192 45 (50)
Net earnings (loss) 161 (425) (253)
Net earnings (loss) attributable to:      
TransAlta shareholders 50 (537) (287)
Non-controlling interests 111 112 34
Net earnings (loss) 161 (425) (253)
Preferred share dividends 46 39 49
Net earnings (loss) attributable to common shareholders $ 4 $ (576) $ (336)
Weighted average number of common shares outstanding in the year (in shares) 271,000 271,000 275,000
Net earnings (loss) per share attributable to common shareholders, basic (in CAD per share) $ 0.01 $ (2.13) $ (1.22)
Net earnings (loss) per share attributable to common shareholders, diluted (in CAD per share) $ 0.01 $ (2.13) $ (1.22)