Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 13

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 13
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 States and Western Australia.

Our sustainability goals include our commitment to cease coal-fired generation at the end of 2025. We remain on track to achieve our 2026
target of 75% scope 1 and 2 GHG emissions reductions since 2015 and our carbon net-zero goal by 2045.

Business of TransAlta

Our business is
comprised of six segments: (i) Hydro; (ii) Wind and Solar; (iii) Gas; (iv) Energy Transition; (v) Energy Marketing; and (vi) Corporate. Our Hydro, Wind and Solar, Gas and Energy Transition segments are responsible for
operating and maintaining our electrical generation facilities in Canada, the United States and Western Australia. Our Energy Marketing segment is responsible for marketing and scheduling our merchant asset fleet in North America (excluding Alberta)
along with the procurement of gas, transport and storage for our gas fleet, providing knowledge to support our growth team, and generating a stand-alone gross margin separate from our asset business through a leading North American energy marketing
platform. These segments are all supported by the Corporate segment.

The following provides more detailed information on these business
segments.

Hydro Segment

The
Hydro segment has a net ownership interest of approximately 922 MW of owned hydroelectric generating capacity. The facilities are located in Alberta, British Columbia and Ontario. As well as contracting for power, we enter into long-term and
short-term contracts to sell the environmental attributes from our merchant hydro facilities. Generally, for facilities under long-term contract, the benefit of the environmental

S-6

attributes generated is provided to the contract holder. The following table summarizes our hydroelectric facilities as at September 30, 2025:

| Facility Name                      |     | Province/ State |     | Nameplate 
  Capacity 
   (MW)(1) |     | Consolidated 
 Interest     |     | Gross Installed 
 Capacity        
 (MW)(1)         |     |     | Ownership |      |     | Net Capacity     
 Ownership        
 Interest (MW)(1) |     |     | Commercial 
  Operation 
    Date(2) |     | Revenue   
 Source(3) |     | Contract Expiry 
 Date(4)         |      |
| Alberta – Bow River System         |     |                 |     |           |     |              |     |                 |     |     |           |      |     |                  |     |     |            |     |           |     |                 |      |
|