Company: TSLTF
Filing Date: 2025-12-09
Form Type: F-10EF
Source: 0001193125-25-312047
Chunk: 0

Company: TRANSALTA CORP
Filing Date: 2025-12-09
Form: F-10EF
Chunk 0
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As filed with the Securities and Exchange Commission on December 9, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM F-10 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 TransAlta Corporation (Exact name of Registrant as specified in its charter) Not Applicable (Translation of Registrant’s name into English (if applicable)) Canada (Province or other jurisdiction of incorporation or organization) 4911 (Primary Standard Industrial Classification Code Number (if applicable)) Not Applicable (I.R.S. Employer Identification Number (if applicable)) Suite 1400, 1100 – 1 stStreet S.E. Calgary, Alberta, T2G 1B1 (403) 267-7110 (Address and telephone number of Registrant’s principal executive offices) TransAlta Centralia Generation LLC 913 Big Hanaford Road, Centralia, Washington 98531, (360) 736-9901 (Name, address (including zip code) and telephone number (including area code) of agent for service in the United States) Copies to:

| Nancy Brennan                      
 TransAlta Corporation              
 Suite 1400, 1100 – 1st Street S.E. 
 Calgary, Alberta Canada T2G        
 1B1                                
 (403) 267-7110                     |     | Jeff Bakker                                 
 Michael Barrett Blake,                      
 Cassels & Graydon LLP 855 - 2nd Street S.W. 
 Suite 3500, Bankers Hall East Tower         
 Calgary, Alberta Canada T2P                 
 4J8 (403) 260-9600                          |     | Christopher J. Cummings                       
 Paul, Weiss, Rifkind, Wharton &               
 Garrison LLP                                  
 Toronto-Dominion Centre 77                    
 King Street West, Suite 3100 Toronto, Ontario 
 Canada M5K 1J3 (416) 504-0522                 |

Approximate date of commencement of proposed sale of the securities to the public:From time to time after the effective date of this registration statement. Province of Alberta, Canada (Principal jurisdiction regulating this offering (if applicable)) It is proposed that this filing shall become effective (check appropriate box)

| A. |     |  ☒ |     | upon filing with the Commission, pursuant to Rule 467(a) (if in connection with an offering being made contemporaneously in the United States and Canada). |     |