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Non-Controlling Interests - Narrative (Details) - MW	9 Months Ended	12 Months Ended
	Oct. 04, 2023	Dec. 31, 2024	Dec. 31, 2023
Kent Hills Wind L.P.
Disclosure of subsidiaries [line items]
Capacity of facility (in megawatts)		167
Kent Hills wind farm
Disclosure of subsidiaries [line items]
Ownership interests	17.00%	17.00%	17.00%
TransAlta Cogeneration, L.P. | Coal facility
Disclosure of subsidiaries [line items]
Ownership interests		50.00%
TransAlta Renewables Inc. | Kent Hills wind farm
Disclosure of subsidiaries [line items]
Ownership interests	17.00%

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The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Total for all subsidiaries [member]; Non-controlling interests]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Capacity Of Generation Units, Power

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