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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2024
Related Party [Abstract]  
Disclosure of interests in subsidiaries
TA Cogen
Year ended Dec. 31202420232022
Revenues167 290 347 
Net earnings and total comprehensive income
9 121 143 
Amounts attributable to the non-controlling interest:
Net earnings9 80 91 
Total comprehensive income9 80 91 
Distributions paid to Canadian Power Holdings Inc.40 148 87 
As at Dec. 3120242023
Current assets47 43 
Long-term assets130 193 
Current liabilities(48)(41)
Long-term liabilities(32)(34)
Total equity(97)(161)
Equity attributable to Canadian Power Holdings Inc.(46)(79)
Non-controlling interest share (per cent)49.99 49.99 
Kent Hills Wind LP
Prior to Oct. 5, 2023, financial information related to the 17 per cent non-controlling interest in Kent Hills Wind LP was included in the financial information disclosed in TransAlta Renewables in this note.
Year ended Dec. 312024
2023(1)
Revenues34 7 
Net earnings and total comprehensive income 7 2 
Amounts attributable to the non-controlling interest:
Net earnings and total comprehensive income1 — 
(1)This represents financial information from Oct. 5, 2023 to Dec. 31, 2023. The net earnings attributable to non-controlling interest in Kent Hills Wind LP prior to Oct. 5, 2023, is included in the disclosures for TransAlta Renewables.
As at Dec. 3120242023
Current assets33 35 
Long-term assets463 481 
Current liabilities(26)(42)
Long-term liabilities(174)(188)
Total equity(296)(285)
Equity attributable to non-controlling interests(51)(48)
Non-controlling interest share (per cent)17 17 
TransAlta Renewables
The financial information disclosed below includes the 17 per cent non-controlling interest in Kent Hills Wind LP until Oct. 5, 2023. TransAlta Renewables at Dec. 31, 2024, and Dec. 31, 2023, is a wholly owned subsidiary of the Company. Refer to Note 4 for more details.
Year ended Dec. 31
2023(1)
2022
Revenues303 560 
Net earnings56 74 
Total comprehensive loss
(7)(67)
Amounts attributable to the non-controlling interests:
Net earnings21 20 
Total comprehensive loss
(4)(36)
Distributions paid to non-controlling interests(2)
75 100 
(1)Non-controlling interest share before the close of the transaction on Oct. 5, 2023. This represents financial information from Jan. 1, 2023 to Oct. 4, 2023.
(2)Distributions paid in the year ended Dec. 31, 2023 include $25 million of dividends declared in the fourth quarter of 2022.
Details of the Company’s principal operating subsidiaries at Dec. 31, 2024, are as follows:
SubsidiaryCountryOwnership
(per cent)		Principal activity
TransAlta Generation PartnershipCanada100Generation and sale of electricity
TransAlta Cogeneration, L.P.Canada50.01Generation and sale of electricity
TransAlta Centralia Generation, LLCU.S.100Generation and sale of electricity
TransAlta Energy Marketing Corp.Canada100Energy marketing
TransAlta Energy Marketing (U.S.), Inc.U.S.100Energy marketing
TransAlta Energy (Australia), Pty Ltd.Australia100Generation and sale of electricity
TransAlta Renewables Inc.Canada
100
Generation and sale of electricity
Heartland Generation Ltd.
Canada
100(1)
Generation and sale of electricity
Alberta Power (2000) Ltd.
Canada
100(1)
Generation and sale of electricity
Associate or joint ventureCountryOwnership
(per cent)		Principal activity
SP Skookumchuck Investment, LLC
U.S.
49Generation and sale of electricity
(1)On Dec. 4, 2024, the Company completed the acquisition of Heartland. Refer to Note 4 for more details.
Disclosure of information about key management personnel and transactions with associates
TransAlta’s key management personnel include the President and Chief Executive Officer (CEO), members of the senior management team that report directly to the President and CEO and the members of the Board. Key management personnel compensation is as follows:
Year ended Dec. 31202420232022
Total compensation36 21 23 
Comprising:
   
Short-term employee benefits13 11 11 
Post-employment benefits1 1 1 
Termination benefits4 1 — 
Share-based payments18 8 11 
Year ended Dec. 31202420232022
Power sales58 135 127 
Purchased power4 2 12 
Asset management fees paid— 1 2