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DOE orders TransAlta (NYSE: TAC) Centralia Unit 2 to remain available 90 more days

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
6-K

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 an additional 90 days, until September 13, 2026. The company states it will comply with the order and continue working with the Department of Energy and the Washington state government in relation to this directive. The filing also reiterates TransAlta’s role as a large North American power generator and includes standard cautionary language about forward-looking statements.

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Mandated availability period 90 days Duration Centralia Unit 2 must remain available under DOE order
Order end date September 13, 2026 Date through which Centralia Unit 2 must remain available
Department of Energy regulatory
"has received an order (The Order) from the United States Department of Energy"
A national Department of Energy is a government agency that sets and enforces energy policy, funds and oversees research, and manages large public energy projects and facilities. Think of it as both the traffic cop and project manager for a country’s energy system: its rules, subsidies, research grants and permits can change how easily energy companies operate, what technologies gain support, and ultimately influence energy costs and corporate profits — all of which matter to investors.
forward-looking information regulatory
"This news release includes “forward-looking information,” within the meaning of applicable Canadian securities laws"
Forward-looking information are predictions, plans, estimates or expectations about a company’s future performance, results or events, such as sales forecasts, project timelines, or anticipated costs. It matters to investors because these statements guide expectations but rely on assumptions and uncertain factors—like a weather forecast for a business—so investors should treat them as informed guesses rather than guarantees and consider the risks and possible changes behind the numbers.
forward-looking statements regulatory
"and “forward-looking statements,” within the meaning of applicable United States securities laws"
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.
MD&A financial
"refer to our most recent MD&A and the 2025 Annual Report"
Management’s Discussion and Analysis (MD&A) is a section of a company’s financial filing where executives explain recent results, the reasons behind changes, risks faced, and expectations for the future in plain language alongside the numbers. Investors use it like an owner’s narrative to understand the story behind the raw financial data — what drove performance, potential pitfalls, and management’s plans — helping judge whether the company’s numbers are likely to improve or worsen.
Annual Report financial
"and the 2025 Annual Report, including the section titled “Governance and Risk Management”"
An annual report is a comprehensive, year-end document a publicly traded company issues that presents its financial statements, management’s discussion of results, business strategy, and key risks. Investors use it like a combined report card and roadmap to judge a company’s financial health, how it makes money, and whether its plans and risks are likely to raise or lower future value, helping inform buy, hold, or sell decisions.
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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 June 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: June 15, 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, 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: 1-855-255-9184
Email: investor_relations@transalta.comEmail: ta_media_relations@transalta.com

FAQ

What did TransAlta (TAC) disclose about Centralia Unit 2 in this 6-K?

TransAlta disclosed that the U.S. Department of Energy ordered Centralia Unit 2 to remain available for operation for 90 days, until September 13, 2026. The company will comply with the order and coordinate with federal and Washington state authorities.

How long must TransAlta’s Centralia Unit 2 remain available under the DOE order?

Centralia Unit 2 must remain available for operation for an additional 90 days, through September 13, 2026. This period is mandated by a U.S. Department of Energy order directed to TransAlta’s subsidiary, TransAlta Centralia Generation LLC.

Which TransAlta subsidiary received the U.S. Department of Energy order?

The order was received by TransAlta’s subsidiary, TransAlta Centralia Generation LLC. This entity owns and operates Centralia Unit 2 in Washington State, which is required to remain available for operation under the 90-day mandate ending September 13, 2026.

Does the TransAlta (TAC) 6-K include financial or earnings data?

The 6-K focuses on the U.S. Department of Energy order regarding Centralia Unit 2’s availability and does not include financial or earnings figures. It also provides corporate background on TransAlta and standard cautionary language about forward-looking statements.

What forward-looking statement cautions did TransAlta include in this filing?

TransAlta warns that forward-looking statements are not guarantees and involve risks and assumptions. It refers investors to its most recent MD&A and 2025 Annual Report, including the “Governance and Risk Management” section, filed on SEDAR+ and with the U.S. SEC.

Filing Exhibits & Attachments

1 document