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Non-Controlling Interests - Subsidiaries and Operations with Non-Controlling Interests (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 04, 2023 | Dec. 31, 2024 | Dec. 31, 2023
TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interests |  | 49.99% | 49.99%
Kent Hills wind farm |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interests | 17.00% | 17.00% | 17.00%
TransAlta Renewables Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interests | 39.90% |  |

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- Definition The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Total for all subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 12 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_12_c&doctype=Standard -URIDate 2024-03-27 + Details
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