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Consolidated Statements of Earnings (Loss) Statement - CAD
shares in Millions, CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Profit or loss [abstract]      
Revenues (Note 33) CAD 2,307 CAD 2,397 CAD 2,267
Fuel and purchased power (Note 5) 1,016 963 1,008
Gross margin 1,291 1,434 1,259
Operations, maintenance, and administration (Note 5) 517 489 492
Depreciation and amortization 635 601 545
Asset impairment charges (reversals) (Note 6) 20 28 (2)
Restructuring provision (Note 4) 0 1 22
Taxes, other than income taxes 30 31 29
Net other operating (income) losses (Note 8) (49) (194) 25
Operating income 138 478 148
Finance lease income (Note 7) 54 66 58
Net interest expense (Note 9) (247) (229) (251)
Foreign exchange gain (loss) (1) (5) 4
Gain on sale of assets and other (Note 4) 2 4 262
Earnings (loss) before income taxes (54) 314 221
Income tax expense (Note 10) 64 38 105
Net earnings (loss) (118) 276 116
Net earnings (loss) attributable to:      
TransAlta shareholders (160) 169 22
Non-controlling interests (Note 11) 42 107 94
Preferred share dividends (Note 24) 30 52 46
Net earnings (loss) attributable to common shareholders CAD (190) CAD 117 CAD (24)
Weighted average number of common shares outstanding in the year (millions) 288 288 280
Net earnings (loss) per share attributable to common shareholders, basic and diluted (Note 23) CAD (0.66) CAD 0.41 CAD (0.09)