Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 278

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 278
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      | 0 |     |      | 0 |

Environmental Incidents and Spills Protecting the environment supports healthy ecosystems and mitigates our environmental compliance risk and reputational risk. We maintain corporate incident management procedures, as part of our Total Safety Management System, for response, investigation and lessons learned to minimize environmental incidents. With respect to biodiversity management (management of ecosystems, natural habitats and life in the areas we operate), we seek to establish robust environmental research and data collection to establish scientifically sound baselines of the natural environment around our facilities to ensure we can accurately evaluate the level of significance to biodiversity following an incident. We closely monitor the air, land, water and wildlife in these areas to identify and curtail potential impacts. In 2024, no regulatory non-complianceenvironmental incidents were recorded (2023 – no incidents). No fines or environmental enforcement actions occurred. The following table represents our regulatory non-complianceenvironmental incidents.

| Year ended Dec. 31                                |     | 2024 |   |     | 2023 |   |     | 2022 |   |
|:--------------------------------------------------|:----|:-----|--:|:----|:-----|--:|:----|:-----|--:|
| Regulatory non-compliance environmental incidents |     |      | 0 |     |      | 0 |     |      | 1 |

Regarding spills and releases, efforts are placed on providing immediate response to all environmental spills to ensure assessment, containment and recovery of spilled materials result in minimal impact to the environment. The volume of spills in 2024 was zero (0) m 3(2023 – 0 m 3). The following table represents our significant environmental incidents.

| Year ended Dec. 31      |     | 2024 |   |     | 2023 |   |     | 2022 |   |
|:------------------------|:----|:-----|--:|:----|:-----|--:|:----|:-----|--:|
| Significant             
 environmental incidents |     |      | 0 |     |      | 0 |     |      | 0 |

| M122 |     | TransAlta Corporation |     | 2024 Integrated Report |

Management’s Discussion and Analysis Engaging with Our Stakeholders to Create Positive Relationships We strive to create shared value for our stakeholders through social and relationship value creation at TransAlta. The most material impacts on our social and relationship performance are fostering positive relationships with Indigenous neighbours, communities,