An anonymous director reports

DEPARTMENT OF ENERGY MANDATES CENTRALIA UNIT 2 REMAIN AVAILABLE FOR OPERATION FOR ADDITIONAL 90 DAYS

TransAlta Corp. has confirmed that its subsidiary, TransAlta Centralia Generation LLC, has received an order from the U.S. Department of Energy. The order mandates that Centralia Unit 2 in Washington State remain available for operation for a period of 90 days until Sept. 13, 2026.

Once in effect, TransAlta will continue to comply with the order and to work with the U.S. Department of Energy and Washington State government in relation thereto.

About TransAlta Corp.

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, its people have safely operated and evolved essential energy infrastructure that powers customers and communities. Its technology-diverse portfolio and disciplined execution allow it to deliver dependable power across evolving energy systems. It takes a practical, responsible approach to meeting today's energy needs while building for what comes next.

We seek Safe Harbor.