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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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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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
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