6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of April 2026

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)

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 ]

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.

EXHIBIT INDEX

EdgarFiling EXHIBIT 99.1

TransAlta to Host Annual and Special Meeting of Shareholders and First Quarter 2026 Results Conference Call

CALGARY, Alberta, April 07, 2026 (GLOBE NEWSWIRE) --

TransAlta Corporation 2026 Annual and Special Meeting of TransAlta Corporation Shareholders

On Thursday, April 30, 2026, TransAlta Corporation (TransAlta or the Company) (TSX: TA) (NYSE: TAC) will hold its annual and special meeting of shareholders at 11:30 a.m. Mountain Time (1:30 p.m. Eastern Time) in a virtual-only meeting format via live audio webcast (https://meetings.lumiconnect.com/400-012-606-918). The management proxy circular (available at https://transalta.com/investors/results-reporting/) provides detailed information about the business of the meeting and the voting process. TransAlta will only conduct the formal business of the meeting and there will not be a management presentation.

First Quarter 2026 Results Conference Call

TransAlta will release its first quarter 2026 results before markets open on Wednesday, May 6, 2026. A conference call and webcast to discuss the results will be held for investors, analysts, members of the media and other interested parties the same day beginning at 9:00 a.m. Mountain Time (11:00 a.m. Eastern Time).

Webcast link: https://edge.media-server.com/mmc/p/kvzu99qi

To access the conference call via telephone, please register ahead of time using the call link: https://register-conf.media-server.com/register/BI822b565342704c408ff9a67ddcd0960c. Once registered, participants will have the option of 1) dialing into the call from their phone (via a personalized PIN); or 2) clicking the “Call Me” option to receive an automated call directly to their phone.

Related materials will be available on the Investor section of TransAlta’s website at https://transalta.com/investors/presentations-and-events/. If you are unable to participate in the call, the replay will be accessible at https://edge.media-server.com/mmc/p/kvzu99qi. A transcript of the broadcast will be posted on TransAlta’s website once it becomes available.

About TransAlta Corporation:

TransAlta is one of Canada’s largest publicly traded power generators, delivering reliable electricity across Canada, the United States and Western Australia. For more than 100 years, our people have safely operated and evolved essential energy infrastructure that powers customers and communities. Our technology-diverse portfolio and disciplined execution allow us to deliver dependable power across evolving energy systems. We take a practical, responsible approach to meeting today’s energy needs while building for what comes next.

For more information about TransAlta, visit our web site at transalta.com.

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