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Non-Controlling Interests (Tables)
 12 Months Ended
Dec. 31, 2019
Interests In Other Entities [Abstract]  
Share of ownership and equity participation in TransAlta Renewables
The Corporation’s subsidiaries and operations that have non-controlling interests are as follows:
Subsidiary/OperationNon-controlling interest as at Dec. 31, 2019
TransAlta Cogeneration L.P.
49.99% - Canadian Power Holdings Inc.
TransAlta Renewables
39.6% - Public shareholders
Kent Hills Wind LP(1)
17% - Natural Forces Technologies Inc.
 (1) Owned by TransAlta Renewables.
Subsidiaries and operations with non-controlling interests
As a result of the conversion of the Class B shares, the DRIP and the Offering described in Note 4(O), the Corporation’s share of ownership and equity participation in TransAlta Renewables has changed as follows:
PeriodOwnership and voting
rights percentage		Equity participation
percentage
Jan. 6, 2016 to July 31, 201764.0  59.8  
Aug. 1, 2017 to June 21, 201864.0  64.0  
June 22, 2018 to July 30, 201861.1  61.1  
July 31, 2018 to Nov. 29, 201861.0  61.0  
Nov. 30, 2018 to Dec. 31, 201860.9  60.9  
Jan. 1, 2019 to Mar. 31, 201960.8  60.8  
Apr. 1, 2019 to June 30, 201960.6  60.6  
July 1, 2019 to Sept. 30, 201960.5  60.5  
Oct. 1, 2019 to Dec. 31, 201960.4  60.4  
Disclosure of interests in subsidiaries
Year ended Dec. 31201920182017
Revenues446  462  459  
Net earnings183  241  13  
Total comprehensive income138  281  (24) 
Amounts attributable to the non-controlling interests:  
Net earnings73  94  11  
Total comprehensive income56  110  —  
Distributions paid to non-controlling interests69  79  85  
As at Dec. 3120192018
Current assets293  250  
Long-term assets3,409  3,497  
Current liabilities(152) (159) 
Long-term liabilities(1,237) (1,192) 
Total equity(2,313) (2,396) 
Equity attributable to non-controlling interests(941) (961) 
Non-controlling interests’ share (per cent)39.639.1

B. TA Cogen
Year ended Dec. 31201920182017
Results of operations   
Revenues181  185  175  
Net earnings43  29  61  
Total comprehensive income43  29  61  
Amounts attributable to the non-controlling interest:   
Net earnings21  14  31  
Total comprehensive income21  14  31  
Distributions paid to Canadian Power Holdings Inc.37  86  87  

As at Dec. 3120192018
Current assets41  82  
Long-term assets328  354  
Current liabilities(27) (54) 
Long-term liabilities(19) (28) 
Total equity(323) (354) 
Equity attributable to Canadian Power Holdings Inc.(160) (176) 
Non-controlling interest share (per cent)49.9949.99
Details of the Corporation’s principal operating subsidiaries at Dec. 31, 2019, are as follows:

SubsidiaryCountryOwnership
(per cent)		Principal activity
TransAlta Generation PartnershipCanada100  Generation and sale of electricity
TransAlta Cogeneration, L.P.Canada50.01  Generation and sale of electricity
TransAlta Centralia Generation, LLCUS100  Generation and sale of electricity
TransAlta Energy Marketing Corp.Canada100  Energy marketing
TransAlta Energy Marketing (U.S.), Inc.US100  Energy marketing
TransAlta Energy (Australia), Pty Ltd.Australia100  Generation and sale of electricity
TransAlta RenewablesCanada60.4  Generation and sale of electricity