Leadership shifts at TransAlta (NYSE: TAC) as new CFO, CCO join

Rhea-AI Filing Summary

TransAlta Corporation is reshaping its senior leadership team. The company appointed Mike Politeski as Executive Vice President, Finance and Chief Financial Officer, effective May 1, 2026, and Grant Arnold as Executive Vice President, Growth and Chief Commercial Officer, effective May 6, 2026.

These appointments align with current CFO Joel Hunter becoming President and CEO on April 30, 2026, following the retirement of President and CEO John Kousinioris. Politeski brings over 25 years of finance and capital markets experience, while Arnold adds more than 30 years in power generation and energy, including leadership in renewables growth. TransAlta highlights this refreshed team as central to executing its strategy of disciplined growth, commercial development and operational excellence across its long-standing power generation business.

Key Figures

Form type: Form 6-K CFO effective date: May 1, 2026 CCO effective date: May 6, 2026 +4 more

7 metrics

Form type Form 6-K Report of foreign private issuer for April 2026

CFO effective date May 1, 2026 Start date for EVP Finance and CFO Mike Politeski

CCO effective date May 6, 2026 Start date for EVP Growth and CCO Grant Arnold

CEO transition date April 30, 2026 Joel Hunter becomes President and CEO

Politeski experience Over 25 years Experience in capital markets and financial strategy

Arnold experience Over 30 years Leadership, commercial and technical power sector experience

Operating history More than 100 years TransAlta’s history operating energy infrastructure

Key Terms

Executive Vice President, Finance and Chief Financial Officer, Executive Vice President, Growth and Chief Commercial Officer, forward-looking statements, Integrated Report, +2 more

6 terms

Executive Vice President, Finance and Chief Financial Officer financial

"appointment of Mike Politeski as Executive Vice President, Finance and Chief Financial Officer"

Executive Vice President, Growth and Chief Commercial Officer financial

"appointment of Grant Arnold as Executive Vice President, Growth and Chief Commercial Officer"

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.

Integrated Report financial

"refer to our 2025 Integrated Report, including the section titled "Governance and Risk Management""

An integrated report is a single corporate document that combines a company's financial results with information about its strategy, governance, risks, and social and environmental performance. For investors it offers a more complete picture of how a business creates value over time—like reading both a scorecard and a roadmap—helping assess long‑term prospects, hidden risks, and the quality of management beyond short‑term profits.

MD&A financial

""Governance and Risk Management" in our MD&A for the year ended December 31, 2025"

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.

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.

Form 6-K: How Foreign Companies Report to the SEC →

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 April 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: April 20, 2026		/s/ Joel Hunter
		Joel Hunter
		Executive Vice President Finance and Chief Financial Officer

EXHIBIT INDEX

Exhibit Number		Description
99.1		TransAlta Appoints Mike Politeski as Chief Financial Officer and Grant Arnold as Chief Commercial Officer

EXHIBIT 99.1

TransAlta Appoints Mike Politeski as Chief Financial Officer and Grant Arnold as Chief Commercial Officer

CALGARY, Alberta, April 20, 2026 (GLOBE NEWSWIRE) -- TransAlta Corporation (TransAlta or the Company) (TSX: TA) (NYSE: TAC) is pleased to announce the appointment of Mike Politeski as Executive Vice President, Finance and Chief Financial Officer (EVP and CFO) and Grant Arnold as Executive Vice President, Growth and Chief Commercial Officer (EVP and CCO), effective May 1, 2026 and May 6, 2026, respectively. The appointments correspond with the transition of current EVP and CFO, Joel Hunter, to the role of President and Chief Executive Officer (CEO) effective April 30, 2026, following the retirement of current President and CEO, John Kousinioris.

“I am very pleased to welcome Mike and Grant to TransAlta’s leadership team. Mike’s financial expertise, sound judgment and strategic perspective will be instrumental in supporting long-term value creation,” said Joel Hunter, incoming President and CEO. “Grant’s track record in successfully originating and executing projects, along with his strong commercial acumen and stakeholder relationships, will drive the execution of our growth priorities. As I step into the President and CEO role at the end of April, I am confident that Mike and Grant will strengthen TransAlta’s high-calibre leadership team that will execute our strategy focused on disciplined growth and operational excellence,” concluded Mr. Hunter.

Mr. Politeski has over 25 years of experience across capital markets, financial strategy, risk, treasury, financial reporting and tax. Over the course of his career, he has played a significant role in large-scale transactions and business transformation, and brings deep experience in investor relations, governance and capital allocation. Most recently, Mr. Politeski served as Senior Vice President, Finance & Treasurer at Veren Inc. (previously Crescent Point Energy Corporation). He holds a Bachelor of Commerce with Distinction from the University of Saskatchewan and a CPA designation.

“TransAlta’s solid financial foundation, talented people and distinct asset base, position the Company to generate long-term value in a dynamic market. I look forward to working with the team, the Board of Directors and the investment community to deliver results and build upon an established platform,” said Mike Politeski, incoming EVP and CFO.

Mr. Arnold brings over 30 years of leadership, commercial and technical experience in the power generation and energy sector. He served as President and CEO of BluEarth Renewables Inc., where he led the company through significant growth, expanding its operating and development portfolio across North America. Prior to that, he held senior roles at Suncor Energy across natural gas exploration and development, operations and renewables. Mr. Arnold holds a Master of Business Administration from the University of Calgary, along with a Master of Engineering and Bachelor of Science, both in Civil Engineering, from the University of Alberta.

“The electricity sector is going through radical change. TransAlta has the track record, scale and commercial breadth to grow successfully with what the market needs. This is an exciting new phase and I’m happy to be part of it,” said Grant Arnold, incoming EVP and CCO.

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. In particular, this news release contains forward-looking statements about the Company’s expectations that the executive leadership team appointments announced herein will assist with the execution of the Company’s strategy.

Forward-looking statements in this news release 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 such forward looking statements 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 2025 Integrated 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.

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

FAQ

What leadership changes does TransAlta (TAC) announce in this Form 6-K?

TransAlta announces new executive appointments and a CEO transition. Joel Hunter becomes President and CEO as of April 30, 2026, replacing retiring CEO John Kousinioris, while new EVP roles for finance and commercial growth are filled in early May 2026.

Who is TransAlta’s new Chief Financial Officer and when does he start?

TransAlta appoints Mike Politeski as Executive Vice President, Finance and Chief Financial Officer. His appointment is effective May 1, 2026, bringing more than 25 years of experience in capital markets, financial strategy, risk, treasury, reporting and tax to the company’s leadership team.

What role will Grant Arnold hold at TransAlta (TAC) and when is it effective?

Grant Arnold will become Executive Vice President, Growth and Chief Commercial Officer at TransAlta. His role is effective May 6, 2026, leveraging over 30 years of power and energy sector experience, including leading BluEarth Renewables through significant portfolio expansion across North America.

How is TransAlta’s current CFO Joel Hunter’s role changing?

Current CFO Joel Hunter will transition to President and Chief Executive Officer. His CEO role becomes effective April 30, 2026, following the retirement of John Kousinioris, aligning with the appointments of new executives overseeing finance and commercial growth shortly afterward.

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

The Form 6-K focuses on leadership appointments and executive transitions rather than financial results. It details the incoming CFO and Chief Commercial Officer, as well as the CEO succession, and includes standard forward-looking statements about executing the company’s strategy.

What experience does incoming CFO Mike Politeski bring to TransAlta (TAC)?

Mike Politeski brings over 25 years of experience across capital markets, financial strategy, risk management, treasury, reporting and tax. He previously served as Senior Vice President, Finance & Treasurer at Veren Inc. and holds a Bachelor of Commerce with Distinction plus a CPA designation.

How does TransAlta describe its business in this filing?

TransAlta describes itself as one of Canada’s largest publicly traded power generators. It delivers reliable electricity in Canada, the United States and Western Australia, operating a technology-diverse portfolio and emphasizing disciplined execution, practical reliability and a long history of evolving essential energy infrastructure.

Filing Exhibits & Attachments

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Press Releases

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