An anonymous director reports

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

TransAlta Corp.'s subsidiary, TransAlta Centralia Generation LLC, has received an order from the United States Department of Energy. The order mandates that Centralia unit 2 in Washington remain available for operation, for a period of 90 days, until June 14, 2026.

TransAlta is currently evaluating the order and will work with the state and federal governments 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, TransAlta's people have safely operated and evolved essential energy infrastructure that powers customers and communities. TransAlta's technology-diverse portfolio and disciplined execution allow the company to deliver dependable power across evolving energy systems. TransAlta takes a practical, responsible approach to meeting today's energy needs while building for what comes next.

We seek Safe Harbor.