Company: TSLTF
Filing Date: 2025-12-09
Form Type: F-10EF
Source: 0001193125-25-312047
Chunk: 35

Company: TRANSALTA CORP
Filing Date: 2025-12-09
Form: F-10EF
Chunk 35
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2024 (incorporated by reference from Exhibit No. 99.3 to the Registrant’s Form 6-K, furnished to the Commission on November 6, 2025).                                                 |
| 4.6     |     | Management’s discussion and analysis for the three and nine month periods ended September                                                                                                          
 30, 2025 (incorporated by reference from Exhibit No. 99.2 to the Registrant’s Form 6-K, furnished to the Commission on November 6, 2025).                                                          |
| 5.1     |     | Consent of Ernst & Young LLP.                                                                                                                                                                      |
| 6.1     |     | Powers of Attorney (included on Page III-4 of this registration statement).                                                                                                                        |
| 7.1     |     | Indenture between TransAlta Corporation and The Bank of New York Mellon (formerly known as The Bank of New York), as trustee, dated as of June 25,                                                 
 2002 (incorporated by reference to Exhibit 1 to TransAlta Corporation’s Form 6-K filed on June 26, 2002).                                                                                          |
| 7.2     |     | Statement of Eligibility of the Trustee on Form T-1.                                                                                                                                               |
| 107     |     | Filing Fee Table.                                                                                                                                                                                  |

II-2

PART III

UNDERTAKING AND CONSENT TO SERVICE OF PROCESS

Item 1. Undertaking

The Registrant undertakes to
make available, in person or by telephone, representatives to respond to inquiries made by the Commission staff, and to furnish promptly, when requested to do so by the Commission staff, information relating to the securities registered pursuant to
Form F-10 or to transactions in said securities.

Item 2. Consent to Service of Process

(a) Concurrently with the filing of this Registration Statement on Form F-10, the Registrant is filing with the
Commission a written irrevocable consent and power of attorney on Form F-X.

(b) Any change to the name or address
of the agent for service of the Registrant shall be communicated promptly to the Commission by amendment to Form F-X referencing the file number of this registration statement.

III-1

SIGNATURES Pursuant to the requirements of the Securities Act, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form F-10and has duly caused this registration statement