# EDGAR Filing Document

**Accession Number:** 0001144800
**File Stem:** 0001193125-25-317918
**Filing Date:** 2025-12
**Character Count:** 3436
**Document Hash:** 327ec48640a9f4357f2ae38cc4cf6593
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-317918.hdr.sgml**: 20251215

**ACCESSION NUMBER**: 0001193125-25-317918

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20251211

**FILED AS OF DATE**: 20251215

**DATE AS OF CHANGE**: 20251212

**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:** 251569513

**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 December 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 ☐ Form 40-F ☒

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**INCORPORATION BY REFERENCE** 

Exhibit 99.1 of this Form 6-K is incorporated by reference as an additional exhibit to the registrant's Registration Statement on Form F-10 (File No. 333-292019).

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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>TransAlta Corporation</u>** |
|  | (Registrant) |
| Date: December 11, 2025 | /s/ Kelly Galloway |
|  | Kelly Galloway |
|  | Corporate Secretary |

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**EXHIBIT INDEX** 

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| | |
|:---|:---|
| **Exhibit Number** | **Description** |
| 99.1 | [Consent of Ernst & Young LLP](d782758dex991.htm) |

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## Exhibit 99.1

**Exhibit 99.1** 

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM** 

We consent to the reference to our firm under the caption "Experts" in the Prospectus Supplement, dated December 11, 2025, to the Registration Statement (Form F-10) and related short form base shelf prospectus of TransAlta Corporation (the "Corporation") for the offering of senior notes and to the inclusion therein of our reports dated February 19, 2025 with respect to the consolidated financial statements of the Corporation as of December 31, 2024 and 2023 and for each of the three years in the period ended December 31, 2024, and with respect to the effectiveness of internal control over financial reporting as of December 31, 2024 included in the Corporation's Annual Report on Form 40-F filed with the Securities and Exchange Commission.

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| | |
|:---|:---|
| December 11, 2025 |  |
| Calgary, Canada | /s/ Ernst & Young LLP |
|  | Chartered Professional Accountants |

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