TransAlta Subsidiary Receives U.S. Department of Energy Order Requiring Centralia Unit 2 To Remain Available For Operation Until December 12

TransAlta Corporation (TransAlta or the Company) (TSX:TA) (NYSE:TAC) confirms that its subsidiary, TransAlta Centralia Generation LLC, has received an order (The Order) from the United States Department of Energy. The Order mandates that Centralia Unit 2 in Washington State remain available for operation, for a period of 90 days, until December 12, 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.