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DOE orders TransAlta plant to remain available 90 days

The U.S. Department of Energy ordered TransAlta’s Centralia Unit 2 to remain available for operation for 90 days, through December 12, 2026.

(Neutral)
(Neutral)
Form Type
6-K

Rhea-AI Filing Summary

TransAlta Corporation (TAC) reports that its subsidiary, TransAlta Centralia Generation LLC, has received an order from the U.S. Department of Energy requiring that Centralia Unit 2 in Washington State remain available for operation for 90 days, until December 12, 2026. TransAlta states it will comply with the order once in effect and will work with the U.S. Department of Energy and the Washington state government in relation to the mandated availability period.

The company also reiterates that its public statements may include forward-looking information and directs readers to its most recent MD&A and 2025 Annual Report for a detailed discussion of risks and assumptions.

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Mandated availability period 90 days Duration that Centralia Unit 2 must remain available for operation under the U.S. Department of Energy order
Mandated availability end date December 12, 2026 Date until which Centralia Unit 2 must remain available for operation
Years in operation Over 115 years TransAlta states it has safely operated energy infrastructure for more than 115 years
Form type Form 40-F filer TransAlta indicates it files annual reports under cover of Form 40-F
forward-looking statements regulatory
"This news release includes “forward-looking information,” ... and “forward-looking statements”"
Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.
Management’s Discussion and Analysis financial
"refer to our most recent MD&A and the 2025 Annual Report"
Management’s discussion and analysis (MD&A) is a narrative section of a company’s financial filing where executives explain the recent financial results, underlying causes of those results, trends they see, and material risks and uncertainties in everyday language. Investors rely on it like a company’s report card with the manager’s comments—helping interpret raw numbers, judge future prospects and cash needs, and spot warnings or opportunities that the financial statements alone may not reveal.
Private Securities Litigation Reform Act of 1995 regulatory
"within the meaning of applicable United States securities laws, including the Private Securities Litigation Reform Act of 1995"
foreign private issuer regulatory
"REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16"
A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.
governance and risk management financial
"including the section titled “Governance and Risk Management” in our MD&A"
Governance and risk management are the systems and practices a company uses to make decisions, set responsibilities, and spot or limit things that could derail its plans — from financial losses to legal problems or operational failures. For investors, strong governance and risk management act like a reliable captain and regular safety checks on a ship: they reduce the chance of sudden shocks, increase transparency, and help protect long‑term value and confidence in the business.

FAQ

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

What did the U.S. Department of Energy require from TransAlta Corporation (TAC) in this 6-K?

The U.S. Department of Energy issued an order requiring Centralia Unit 2 in Washington State, owned by a TransAlta subsidiary, to remain available for operation for 90 days, until December 12, 2026.

Which TransAlta facility is affected by the Department of Energy order in the TAC filing?

The order affects Centralia Unit 2 in Washington State, which is owned and operated by TransAlta’s subsidiary, TransAlta Centralia Generation LLC.

How long must Centralia Unit 2 remain available for operation according to the DOE order?

Centralia Unit 2 must remain available for operation for a period of 90 days, up to and including December 12, 2026, as mandated by the U.S. Department of Energy.

How does TransAlta (TAC) say it will respond to the DOE order on Centralia Unit 2?

TransAlta states that, once the order is in effect, it will continue to comply with it and will work with the U.S. Department of Energy and the Washington state government regarding the mandated availability of Centralia Unit 2.

Does this TransAlta 6-K include any financial results or earnings data for TAC?

No. The report focuses on the U.S. Department of Energy’s order regarding Centralia Unit 2’s mandated availability and includes a standard cautionary statement on forward-looking information, but it does not present financial or earnings figures.

Where does TransAlta (TAC) direct investors for more detail on risks and assumptions?

TransAlta refers readers to its most recent MD&A and 2025 Annual Report, including the section titled “Governance and Risk Management,” available on SEDAR+ and the SEC’s website.

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 September 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: September 14, 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, Sept. 14, 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 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. 

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 115 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: 1-855-255-9184
Email: investor_relations@transalta.comEmail: ta_media_relations@transalta.com

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