# EDGAR Filing Document

**Accession Number:** 0001144800
**File Stem:** 0001171843-25-005962
**Filing Date:** 2025-9
**Character Count:** 5597
**Document Hash:** a12a32dc2184bc8c32e0ea1b5411acca
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001171843-25-005962.hdr.sgml**: 20250918

**ACCESSION NUMBER**: 0001171843-25-005962

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250918

**FILED AS OF DATE**: 20250918

**DATE AS OF CHANGE**: 20250918

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TRANSALTA CORP
- **CENTRAL INDEX KEY:** 0001144800
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-15214
- **FILM NUMBER:** 251324328

**BUSINESS ADDRESS:**
- **STREET 1:** TRANSALTA PLACE
- **STREET 2:** 1400, 1100 - 1ST STREET S.E.
- **CITY:** CALGARY
- **STATE:** A0
- **ZIP:** T2G 1B1
- **BUSINESS PHONE:** 403-267-2014

**MAIL ADDRESS:**
- **STREET 1:** TRANSALTA PLACE
- **STREET 2:** 1400, 1100 - 1ST STREET S.E.
- **CITY:** CALGARY
- **STATE:** A0
- **ZIP:** T2G 1B1

**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 2025**

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 [ ] &nbsp;&nbsp;&nbsp;&nbsp; Form 40-F [ X ]

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**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.

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| | |
|:---|:---|
|  | <u>**&nbsp;&nbsp;&nbsp;&nbsp;TransAlta Corporation&nbsp;&nbsp;&nbsp;&nbsp;**</u> |
|  | (Registrant) |
| Date: September 18, 2025 | <u>&nbsp;&nbsp;&nbsp;&nbsp;/s/ Joel Hunter&nbsp;&nbsp;&nbsp;&nbsp;</u> |
|  | Joel Hunter |
|  | Executive Vice President Finance and Chief Financial Officer |

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**EXHIBIT INDEX**

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| | |
|:---|:---|
| <u>**Exhibit Number**</u> | <u>**Description**</u> |
| [99.1](exh_991.htm) | [TransAlta to Host 2025 Investor Day](exh_991.htm) |

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## Exhibit 99.1

**EXHIBIT 99.1**

**TransAlta to Host 2025 Investor Day**

CALGARY, Alberta, Sept. 18, 2025 (GLOBE NEWSWIRE) -- TransAlta Corporation (TransAlta or the Company) (TSX: TA) (NYSE: TAC) is pleased to announce that it will hold an Investor Day in Toronto on Tuesday, November 18, 2025. The formal presentation will commence at 9:00 a.m. (ET) (7:00 a.m. MT) and is expected to conclude by approximately 11:30 a.m. (ET) (9:30 a.m. MT).

The event will feature presentations from John Kousinioris, President and Chief Executive Officer, and Joel Hunter, Executive Vice President and Chief Financial Officer, followed by a panel discussion with the broader leadership team. They will provide an in-depth overview of the Company's strategic priorities, long-term plan, financial outlook and growth objectives.

TransAlta's Investor Day is open to the investment community and is being hosted in a hybrid format, with in-person and live webcast attendance options available. Attendees may register for the webcast using the link below or register for in-person attendance through the Investor Centre of TransAlta's website. Registration for in-person attendance closes on Monday, November 10, 2025.

**2025 Investor Day Webcast Registration Link:** https://reg.lumiengage.com/transalta

**Event details:** TransAlta 2025 Investor Day

November 18, 2025

Start time: 9:00 a.m. ET / 7:00 a.m. MT

For those unable to attend or view the event live, a recording of the video webcast and corresponding presentation will be made available on the Investor Centre section of TransAlta's website.

***About TransAlta Corporation:***

TransAlta owns, operates and develops a diverse fleet of electrical power generation assets in Canada, the United States and Australia with a focus on long-term shareholder value. TransAlta provides municipalities, medium and large industries, businesses and utility customers with affordable, energy efficient and reliable power. Today, TransAlta is one of Canada's largest producers of wind power and Alberta's largest producer of thermal generation and hydro-electric power. For over 114 years, TransAlta has been a responsible operator and a proud member of the communities where we operate and where our employees work and live. TransAlta aligns its corporate goals with the UN Sustainable Development Goals and the Future-Fit Business Benchmark, which also defines sustainable goals for businesses. Our reporting on climate change management has been guided by the International Financial Reporting Standards (IFRS) S2 Climate-related Disclosures Standard and the Task Force on Climate-related Financial Disclosures (TCFD) recommendations. TransAlta has achieved a 70 per cent reduction in GHG emissions or 22.7 million tonnes CO2e since 2015 and received an upgraded MSCI ESG rating of AA*.*

For more information about TransAlta, visit our web site at <u>transalta.com</u>.

**For more information:**

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| | |
|:---|:---|
| ***Investor Inquiries:*** | ***Media Inquiries:*** |
| Phone: 1-800-387-3598 in Canada and U.S. | Phone: 1-855-255-9184 |
| Email: investor_relations@transalta.com | Email: ta_media_relations@transalta.com |

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