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Non-Controlling Interests (Tables)
 12 Months Ended
Dec. 31, 2022
Interests In Other Entities [Abstract]  
Disclosure of share of ownership and equity participation in TransAlta Renewables
The Company’s subsidiaries and operations that have non-controlling interests are as follows:
Subsidiary/Operation
Non-controlling interest as at Dec. 31, 2022
TransAlta Cogeneration LP
49.99% — Canadian Power Holdings Inc.
TransAlta Renewables
39.9% — Public shareholders
Kent Hills Wind LP(1)
17% — Natural Forces Technologies Inc.
(1)    Owned by TransAlta Renewables.
Disclosure of interests in subsidiaries
The net earnings, distributions and equity attributable to non-controlling interests include the 17 per cent non-controlling interest in Kent Hills Wind LP.
Year ended Dec. 31202220212020
Revenues560 470 436 
Net earnings74 139 97 
Total comprehensive income (loss)(67)66 223 
Amounts attributable to the non-controlling interests:  
Net earnings20 50 40 
Total comprehensive income (loss)(36)21 90 
Distributions paid to non-controlling interests100 100 80 
As at Dec. 3120222021
Current assets240 430 
Long-term assets2,989 3,319 
Current liabilities(306)(593)
Long-term liabilities(1,118)(1,033)
Total equity(1,805)(2,123)
Equity attributable to non-controlling interests(732)(869)
Non-controlling interests’ share (per cent)39.939.9
B. TA Cogen
Year ended Dec. 31202220212020
Revenues347 265 146 
Net earnings (loss)143 103 (13)
Total comprehensive income (loss)143 103 (13)
Amounts attributable to the non-controlling interest:   
Net earnings (loss)91 62 (6)
Total comprehensive income (loss)91 62 (6)
Distributions paid to Canadian Power Holdings Inc.87 56 17 
As at Dec. 3120222021
Current assets127 66 
Long-term assets253 312 
Current liabilities(62)(52)
Long-term liabilities(27)(36)
Total equity(291)(290)
Equity attributable to Canadian Power Holdings Inc.(147)(142)
Non-controlling interest share (per cent)49.9949.99
Details of the Company’s principal operating subsidiaries at Dec. 31, 2022, 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, LLCUS100Generation and sale of electricity
TransAlta Energy Marketing Corp.Canada100Energy marketing
TransAlta Energy Marketing (U.S.), Inc.US100Energy marketing
TransAlta Energy (Australia), Pty Ltd.Australia100Generation and sale of electricity
TransAlta Renewables Inc.Canada60.1Generation and sale of electricity
Associate or joint ventureCountryOwnership
(per cent)		Principal activity
SP Skookumchuck Investment, LLCUS49Generation and sale of electricity
EMG International, LLCUS30Wastewater treatment and biogas fuel to generate electricity