XML 103 R73.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Common Shares (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Share Capital, Reserves And Other Equity Interest [Abstract] |
Disclosure of issued and outstanding | TransAlta is authorized to issue an unlimited number of voting common shares without nominal or par value.
As at Dec. 31 | 2024 |  | 2023
Common shares (millions) | Amount |  | Common shares (millions) | Amount
Issued and outstanding, beginning of period | 306.9 |  | 3,285 |  |  | 268.1 |  | 2,863 |
Reversal of provision for repurchase of common shares under ASPP | 1.7 |  | 19 |  |  | — |  | — |
Purchased and cancelled under the NCIB(1)(2) | (13.5) |  | (146) |  |  | (7.5) |  | (80) |
Share-based payment plans | 0.8 |  | 9 |  |  | 0.8 |  | 6 |
Stock options exercised | 1.6 |  | 12 |  |  | 0.7 |  | 5 |
Issued for acquisition of TransAlta Renewables(3) (Note 4) | — |  | — |  |  | 46.5 |  | 510 |
Issued and outstanding, end of year, prior to ASPP | 297.5 |  | 3,179 |  |  | 308.6 |  | 3,304 |
Provision for repurchase of common shares under ASPP | — |  | — |  |  | (1.7) |  | (19) |
Issued and outstanding, end of year | 297.5 |  | 3,179 |  |  | 306.9 |  | 3,285 |
(1)2024 includes $2 million of tax on share buybacks (2023 — nil) on the fair value of the shares repurchased. (2)Shares purchased by the Company under the NCIB (as defined below) are recognized as a reduction to share capital equal to the average carrying value of the common shares. Any difference between the aggregate purchase price and the average carrying value of the common shares is recorded in retained earnings (deficit). (3)Net of $4 million of transaction costs. The effects of the Company's purchase and cancellation of common shares during the period are as follows:
For the year ended Dec. 31 | 2024 |  | 2023
Total shares purchased | 13,467,400 |  |  | 7,537,500 |
Average purchase price per share | 10.59 |  |  | 11.49 |
Total cost (millions) | 143 |  |  | 87 |
Book value of shares cancelled | 146 |  |  | 80 |
Amount recorded in deficit | 3 |  |  | (7) |
All preferred shares issued and outstanding are non-voting cumulative redeemable fixed or floating rate first preferred shares.
As at Dec. 31 | 2024 |  | 2023
Series(1) | Number of shares (millions) | Amount |  | Number of shares (millions) | Amount
Series A | 9.6 |  | 235 |  |  | 9.6 |  | 235 |
Series B | 2.4 |  | 58 |  |  | 2.4 |  | 58 |
Series C | 10.0 |  | 243 |  |  | 10.0 |  | 243 |
Series D | 1.0 |  | 26 |  |  | 1.0 |  | 26 |
Series E | 9.0 |  | 219 |  |  | 9.0 |  | 219 |
Series G | 6.6 |  | 161 |  |  | 6.6 |  | 161 |
Issued and outstanding, end of period | 38.6 |  | 942 |  |  | 38.6 |  | 942 |
(1)The Series I Preferred Shares are accounted for as long-term debt. Refer to Note 26.
Disclosure of earnings per share |
Year ended Dec. 31 | 2024 | 2023 | 2022
Net earnings attributable to common shareholders | 177 |  | 644 |  | 4 |
Basic and diluted weighted average number of common shares outstanding (millions) | 302 |  | 276 |  | 271 |
Net earnings per share attributable to common shareholders, basic and diluted | 0.59 |  | 2.33 |  | 0.01 |

X
- Definition The disclosure of classes of share capital. [Refer: Classes of share capital [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2024-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2024-en-r&anchor=para_66&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_EarningsPerShareExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Capital, Reserves And Other Equity Interest [Abstract] + References No definition available. + Details
Name: | tac_ShareCapitalReservesAndOtherEquityInterestAbstract
Namespace Prefix: | tac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration