TransAlta (TAC) inks 700 MW Centralia agreement enabling coal-to-gas shift

Rhea-AI Filing Summary

TransAlta Corporation filed a Form 6-K noting that it has signed a long-term agreement for 700 MW at its Centralia facility. The agreement is described as enabling a coal-to-natural-gas conversion at the site, indicating a move toward lower-emission power generation. The report is signed by the Executive Vice President Finance and Chief Financial Officer, confirming the company’s authorization of this disclosure.

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 December 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)

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.

		TransAlta Corporation
		(Registrant)
Date: December 9, 2025		/s/ Joel Hunter
		Joel Hunter
		Executive Vice President Finance and Chief Financial Officer

EXHIBIT INDEX

Exhibit Number		Description
99.1		TransAlta Signs Long-Term Agreement for 700 MW at Centralia Facility Enabling Coal to Natural Gas Conversion

FAQ

What did TransAlta Corporation (TAC) report in this Form 6-K?

TransAlta Corporation reported that it has signed a long-term agreement for 700 MW at its Centralia facility, enabling a coal-to-natural-gas conversion.

What is the capacity covered by TransAlta's new agreement at the Centralia facility?

The agreement covers 700 MW of capacity at TransAlta’s Centralia facility.

What transition does the Centralia agreement enable for TransAlta (TAC)?

The agreement enables a coal-to-natural-gas conversion at TransAlta’s Centralia facility.

Who signed the TransAlta (TAC) Form 6-K report?

The report was signed by Joel Hunter, Executive Vice President Finance and Chief Financial Officer of TransAlta Corporation.

Which annual report form does TransAlta Corporation (TAC) use?

TransAlta Corporation files its annual reports under cover of Form 40-F.