Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 275

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 275
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     | TransAlta Corporation |     | 2024 Integrated Report |

Management’s Discussion and Analysis Lagoon, a facility that is no longer needed for ash storage following the coal-to-gasconversion of Keephills Unit 2. This project will reshape the existing lagoon so that it is stable for the long term and is the first step towards decommissioning the structure. Similar work is underway to remove the coal combustion waste storage ponds at the Centralia facility in Washington State. TransAlta is proud of its reputation in dam safety. We participate in many industry associations including the Canadian Dam Association, Dam Safety Interest Group of the Centre for Energy Advancement through Technological Innovation, United States Society on Dams, Canadian Geotechnical Society, Dam Safety Advisory Committee of the Alberta Chamber of Resources and Association of State Dam Safety Officials. For information on our corporate emergency management program, refer to Public Health and Safety in the Engaging with Our Stakeholders to Create Positive Relationships section of this MD&A. Waste The importance of environmental protection and waste management is outlined in our Environmental Policy as a corporate responsibility for TransAlta and its employees, and contractors working on TransAlta’s behalf. Our waste data is reported annually to a number of different regulatory bodies. In 2024, our operations generated approximately 384,000 tonnes equivalent of waste (2023 – 479,000 tonnes). Of the total waste generated, 98 per cent was non-hazardouswaste and zero per cent was directed to landfill (2023 – 0.2 per cent). Since its retirement, we have been selling ash from our Highvale and Centralia Mine, which accounts for 97 per cent of the total waste generated. The following table represents our total waste generation (tonnes equivalent). Figures have been rounded to the nearest one thousand.

| Year ended Dec. 31                         |     | 2024 |         |     | 2023 |         |     | 2022 |         |
|:-------------------------------------------|:----|:-----|--------:|:----|:-----|--------:|:----|:-----|--------:|
| Waste to landfill (tonne eq.)              |     |      |   1,000 |     |      |   1,000 |     |      |   2,000 |
| Waste recycled (tonne eq.)                 |     |      |  12,000 |     |      |  19,000 |     |      |