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Consolidated Statements of Earnings - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Profit or loss [abstract]      
Revenue $ 2,845 $ 3,355 $ 2,976
Fuel and purchased power 939 1,060 1,263
Carbon compliance 112 112 78
Gross margin 1,794 2,183 1,635
Operations, maintenance, and administration 655 539 521
Depreciation and amortization 531 621 599
Asset impairment charges (reversals) 46 (48) 9
Taxes, other than income taxes 36 29 33
Net other operating income (59) (47) (58)
Operating income 585 1,089 531
Equity income 5 4 9
Finance lease income 14 12 19
Interest income 30 59 24
Interest expense (324) (281) (286)
Foreign exchange gain (loss) 5 (7) 4
Gain on sale of assets and other 4 4 52
Earnings before income taxes 319 880 353
Income tax expense 80 84 192
Net earnings 239 796 161
Net earnings attributable to:      
TransAlta shareholders 229 695 50
Non-controlling interests 10 101 111
Net earnings 239 796 161
Preferred share dividends 52 51 46
Net earnings attributable to common shareholders $ 177 $ 644 $ 4
Weighted average number of common shares outstanding in the year (in shares) 302 276 271
Net earnings (loss) per share attributable to common shareholders, basic (in CAD per share) $ 0.59 $ 2.33 $ 0.01
Net earnings (loss) per share attributable to common shareholders, diluted (in CAD per share) $ 0.59 $ 2.33 $ 0.01