Press Releases June 15, 2026 07:00 AM

Department of Energy Mandates Centralia Unit 2 Remain Available for Operation for Additional 90 Days

DOE orders extension for operation availability of TransAlta’s Centralia Unit 2 for 90 days

By Jordan Park
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TransAlta Corporation's subsidiary, TransAlta Centralia Generation LLC, has been mandated by the U.S. Department of Energy to keep Centralia Unit 2 in Washington State available for operation until September 13, 2026. The company will comply with this order and coordinate with the DOE and local government accordingly.

Department of Energy Mandates Centralia Unit 2 Remain Available for Operation for Additional 90 Days
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Key Points

  • The U.S. DOE has issued a 90-day order to keep Centralia Unit 2 operational, reflecting ongoing energy supply concerns.
  • TransAlta operates one of Canada’s largest and diverse power generation portfolios, including facilities in the United States.
  • The extension ensures short-term grid reliability amid energy system transitions, impacting the power generation and utilities sectors.

CALGARY, Alberta, June 15, 2026 (GLOBE NEWSWIRE) -- 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 September 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 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.

Cautionary Statement Regarding Forward-Looking Information

This news release includes “forward-looking information,” within the meaning of applicable Canadian securities laws, and “forward-looking statements,” within the meaning of applicable United States securities laws, including the Private Securities Litigation Reform Act of 1995 (collectively referred to herein as “forward-looking statements”). Forward-looking statements are not facts, but only predictions and generally can be identified by the use of statements that include phrases such as “may”, “will”, “believe”, “expect”, “estimate”, “anticipate”, “intend”, “plan”, “forecast”, “continue” or other similar words. Forward-looking statements are intended to provide the reader information about management’s current expectations and plans and readers are cautioned that such information may not be appropriate for other purposes. Forward-looking statements are subject to important risks and uncertainties and are based on certain key assumptions. All forward-looking statements reflect TransAlta’s beliefs and assumptions based on information available at the time the statements were made and as such are not guarantees of future performance. As actual results could vary significantly from the forward-looking statements, you should not put undue reliance on forward-looking statements and should not use future-oriented information or financial outlooks for anything other than their intended purpose. We do not update our forward-looking statements due to new information or future events, unless we are required to by law. For additional information on the assumptions made, and the risks and uncertainties which could cause actual results to differ from the anticipated results, refer to our most recent MD&A and the 2025 Annual Report, including the section titled “Governance and Risk Management” in our MD&A for the year ended December 31, 2025, filed under TransAlta’s profile on SEDAR+ at www.sedarplus.ca and with the U.S. Securities and Exchange Commission at www.sec.gov.

Note: All financial figures are in Canadian dollars unless otherwise indicated.

For more information:

Investor Inquiries:Media Inquiries:Phone: 1-800-387-3598 in Canada and USPhone: 1-855-255-9184Email: [email protected]: [email protected]

Risks

  • Dependence on regulatory and governmental mandates introduces operational uncertainties for the company’s generation assets.
  • Forward-looking statements warn of variations in actual performance, which may be affected by policy changes or market conditions.
  • Market volatility related to energy transition and regulatory compliance could impact financial performance and investor confidence.

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