Company: TSLTF
Filing Date: 2025-11-17
Form Type: 6-K
Source: 0001171843-25-007364
Chunk: 0

Company: TRANSALTA CORP
Filing Date: 2025-11-17
Form: 6-K
Chunk 0
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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

For the month of November 2025

Commission File Number: 001-15214

TransAlta Corporation
(Translation of registrant's name into English)

Suite 1400, 1100 – 1st Street S.E., Calgary, Alberta, T2G 1B1
(Address of principal executive office)</div>

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

<div align='center'>SIGNATURES</div>

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.

| Date: November 17, 2025 |     | TransAlta Corporation                                        
 (Registrant)                                                 
 /s/ Joel Hunter                                              |
|:------------------------|:----|:-------------------------------------------------------------|
|                         |     | Joel Hunter                                                  |
|                         |     | Executive Vice President Finance and Chief Financial Officer |

<div align='center'>EXHIBIT INDEX</div>

| Exhibit Number |     | Description                                                                  |
| 99.1           |     | TransAlta to Acquire 310 MW Contracted Ontario Gas Portfolio for $95 Million |