# EDGAR Filing Document

**Accession Number:** 0001144800
**File Stem:** 0001193125-25-316902
**Filing Date:** 2025-12
**Character Count:** 6902
**Document Hash:** dbf8da40b80e5c35b8fa822917adce0e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-316902.hdr.sgml**: 20251212

**ACCESSION NUMBER**: 0001193125-25-316902

**CONFORMED SUBMISSION TYPE**: FWP

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251212

**DATE AS OF CHANGE**: 20251212

**SUBJECT COMPANY**: 

**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:** FWP
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 333-292019
- **FILM NUMBER:** 251566674

**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
**FILED BY**: 

**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:** FWP

**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

**Filed Pursuant to Rule 433** 

**Registration No. 333-292019** 

**December 11, 2025** 

**TransAlta Corporation** 

**Pricing Term Sheet** 

*This pricing term sheet is qualified in its entirety by reference to the Preliminary Prospectus Supplement, dated December 11, 2025 (the "Preliminary Prospectus Supplement"). The information in this pricing term sheet supplements the Preliminary Prospectus Supplement and updates and supersedes the information in the Preliminary Prospectus Supplement to the extent it is inconsistent with the information in the Preliminary Prospectus Supplement. Terms used and not defined herein have the meanings assigned in the Preliminary Prospectus Supplement.* 

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| | |
|:---|:---|
| **Issuer:** | TransAlta Corporation |
| **Expected Ratings:<sup>(1)</sup>** | Ba1 / BB+ |
| **Security Type:** | SEC-registered senior unsecured notes |
| **Size/Gross Proceeds:** | US$400,000,000 / US$397,540,000 |
| **Maturity:** | February 1, 2034 |
| **Coupon:** | 5.875% per annum, payable semi-annually |
| **Price:** | 99.385%, plus accrued interest, if any from December 22, 2025 |
| **Yield to Maturity:** | 5.970% |
| **Spread:** | + 200 basis points |
| **Benchmark Treasury:** | UST 4.5% due November 15, 2033 |
| **Treasury Yield:** | 3.97% |
| **Trade Date:** | December 11, 2025 |

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| | |
|:---|:---|
| **Settlement:** | December 22, 2025 (T+7) |
|  | We expect that delivery of the Notes will be made to investors on or about December 22, 2025, which will be the 7th business day following the date of this Prospectus Supplement (such settlement being referred to as "T+7"). Under Rule 15c6-1 under the U.S. Exchange Act, trades in the secondary market are required to settle in one business day, unless the parties to any such trade expressly agree otherwise. Accordingly, purchasers who wish to trade Notes prior to the delivery of the Notes hereunder may be required, by virtue of the fact that the Notes initially settle in T+7, to specify an alternate settlement arrangement at the time of any such trade to prevent a failed settlement. Purchasers of Notes who wish to trade Notes prior to their date of delivery hereunder should consult their advisors. |
| **Interest Payment Dates:** | February 1 and August 1 of each year, commencing August 1, 2026 to the persons in whose names the Notes are registered at the close of business on the preceding January 15 or July 15, respectively |
| **Equity Clawback:** | Up to 40% in aggregate principal amount of the Notes at 105.875%, plus accrued and unpaid interest, if any, to, but not including, the redemption date, prior to February 1, 2029 provided that at least 60% of the aggregate principal amount of the Notes remains outstanding, and redemption occurs within 180 days of the closing of any Equity Offering |
| **Optional Redemption:** | On or after February 1, 2029, the Issuer may redeem the Notes on any one or more occasions, in whole or in part, at the following redemption prices (expressed as a percentage of principal amount), plus accrued and unpaid interest, if any, to, but excluding, the redemption date, if redeemed during the 12-month period commencing on February 1, 2029 of the years set forth below: |

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| | |
|:---|:---|
| **On or after:** | **Price:** |
| 2029 | 102.9375% |
| 2030 | 101.46875% |
|  2031 and thereafter | 100% |

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| | |
|:---|:---|
| **Make-whole redemption:** | Prior to February 1, 2029 at a make-whole premium discounted based on the Treasury Rate +50 basis points |
| **Change of control:** | Issuer to offer to repurchase the Notes at a price equal to 101% of principal plus accrued and unpaid interest, if any, to, but excluding, the repurchase date upon the occurrence of a Change of Control Triggering Event |
| **CUSIP No.:** | 89346D AL1 |
| **ISIN No.:** | US89346DAL10 |
| **Joint Book-Running Managers:** | RBC Capital Markets, LLC<br> CIBC World Markets Corp. |
|  | BofA Securities, Inc. |
|  | Morgan Stanley & Co. LLC |
|  | Scotia Capital (USA) Inc. |
| **Co-Managers:** | BMO Capital Markets Corp. |
|  | TD Securities (USA) LLC |
|  | National Bank of Canada Financial Inc. |
|  | ATB Securities Inc. |
|  | Desjardins Securities Inc. |
|  | MUFG Securities Americas Inc. |
|  | J.P. Morgan Securities LLC |
|  | Mizuho Securities USA LLC |
|  | Loop Capital Markets LLC |

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(1) Note: a securities rating is not a recommendation to buy, sell or hold securities and may be subject to
revision or withdrawal at any time

**The issuer has filed a registration statement (including a prospectus) with the United States Securities and Exchange Commission (the "SEC") for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus if you request it by calling RBC Capital Markets, LLC toll free at 1-866-375-6829.**