DOE orders TransAlta Centralia Unit 2 for 90 days

TransAlta Corporation reports that its subsidiary, TransAlta Centralia Generation LLC, has received an order from the U.S. Department of Energy requiring Centralia Unit 2 in Washington State to remain available for operation for 90 days, until June 14, 2026.

Rhea-AI Filing Summary

TransAlta Corporation reports that its subsidiary, TransAlta Centralia Generation LLC, has received an order from the U.S. Department of Energy requiring Centralia Unit 2 in Washington State to remain available for operation for 90 days, until June 14, 2026.

The company is evaluating the order and plans to work with state and federal governments in relation to it. TransAlta describes itself as one of Canada’s largest publicly traded power generators, with operations in Canada, the United States and Western Australia.

Insights

Utilities and regulation analyst

DOE mandates short-term availability for a TransAlta U.S. coal unit.

The key development is a U.S. Department of Energy order directing Centralia Unit 2 to remain available for operation for 90 days, until June 14, 2026. This indicates a temporary reliability or supply concern in the region where the unit operates.

The order does not detail commercial terms, cost recovery, or dispatch levels, so financial impact is unclear from this information alone. The company states it is evaluating the order and will work with state and federal governments, suggesting potential follow-on regulatory or commercial discussions.

Investors may look to future public disclosures, such as MD&A or subsequent reports, for any quantified revenue, cost, or capital implications tied to this mandated availability period and for updates on how this affects the unit’s operating plans after June 14, 2026.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did the U.S. Department of Energy require from TransAlta (TAC)?

The U.S. Department of Energy ordered TransAlta’s Centralia Unit 2 to remain available for operation for 90 days. The mandate applies to the Washington State unit and runs until June 14, 2026, requiring the plant to stay available during that period.

Which TransAlta facility is affected by the new DOE order?

The order affects Centralia Unit 2, operated by TransAlta Centralia Generation LLC in Washington State. This specific generating unit must remain available for operation for 90 days, through June 14, 2026, under the Department of Energy’s directive.

How long must TransAlta’s Centralia Unit 2 remain available for operation?

Centralia Unit 2 must remain available for operation for 90 days, until June 14, 2026. This timeframe is explicitly set in the Department of Energy order received by TransAlta’s subsidiary, covering a defined short-term operating window.

How is TransAlta (TAC) responding to the DOE order on Centralia Unit 2?

TransAlta states it is evaluating the order and will work with state and federal governments. The company has not provided financial details, but indicates ongoing engagement with regulators as it reviews the implications for Centralia Unit 2’s operations.

What type of company is TransAlta Corporation (TAC)?

TransAlta is one of Canada’s largest publicly traded power generators. It delivers electricity across Canada, the United States and Western Australia and highlights a technology-diverse portfolio, long operating history, and focus on reliable, practical energy solutions for customers and communities.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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 March 2026

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: March 17, 2026		/s/ Joel Hunter
		Joel Hunter
		Executive Vice President Finance and Chief Financial Officer

EXHIBIT INDEX

Exhibit Number		Description
99.1		Department of Energy Mandates Centralia Unit 2 Remain Available for Operation for Additional 90 Days

EXHIBIT 99.1

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

CALGARY, Alberta, March 17, 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 June 14, 2026.

TransAlta is currently evaluating the Order and will work with the state and federal governments 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 US	Phone: 1-855-255-9184
Email: investor_relations@transalta.com	Email: ta_media_relations@transalta.com

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 PRESS RELEASE 4.9 KB