Company: TSLTF
Filing Date: 2025-03-25
Form Type: 6-K
Source: 0001144800-25-000011
Chunk: 0

Company: TRANSALTA CORP
Filing Date: 2025-03-25
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 March 2025

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

#### Suite 1400, 1100 – 1

#### st

#### Street S.E., Calgary, Alberta, T2G 1B1
<div align='center'>(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): ____

#### Incorporation by Reference
The Notice of Annual Meeting of Shareholders dated March 7, 2025, filed as part of Exhibit 99.1, and the Management Proxy Circular of the Registrant dated March 7, 2025, filed as part of Exhibit 99.2 are hereby filed for the purpose of being and hereby are incorporated by reference into the Registrant’s registration statements filed under the Securities Act of 1933, as amended.

| Form |     | Registration No. |
| S-8  |     | 333-72454        |
| S-8  |     | 333-101470       |
| S-8  |     | 333-236894       |
| S-8  |     | 333-260935       |
| F-10 |     | 333-271953       |

The Form of Proxy of the Registrant filed as Exhibit 99.3 and the Notice of Availability filed as Exhibit 99.4 are hereby furnished, not filed, and will not be incorporated by reference into any registration statement filed by TransAlta Corporation under the Securities Act of 1933, as amended.

### SIGNATURES
Pursuant to the requirements of the