Company: TSLTF
Filing Date: 2025-04-24
Form Type: 6-K
Source: 0001144800-25-000016
Chunk: 0

Company: TRANSALTA CORP
Filing Date: 2025-04-24
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549</div>

#### FORM 6-K
<div align='center'>REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934</div>

For the month of April 2025

### TRANSALTA CORPORATION
<div align='center'>(Translation of registrant’s name into English)

1400, 1100 - 1st Street S.E., Calgary, Alberta, T2G 1B1

(Address of principal executive offices)</div>

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F____ Form 40-F X

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ____

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ____

#### Signatures
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

|     | TransAlta Corporation |
| By: | /s/ Kelly Galloway    |
|     | Kelly Galloway        
 Corporate Secretary   |

Date: April 24, 2025

### EXHIBIT INDEX
99.1 Report of Voting Results for TransAlta Corporation Annual Meeting of Shareholders held April 2 4 , 202 5