Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 261

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 261
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 with natural gas combustion 
 during electricity production where the sales and delivery of physical natural gas occur.   |

| (5) | Category 15: Investments includes scope 1 and 2 GHG emissions (on an equity basis) from our            
 assets that are owned (as a joint venture or other ownership structure) but not operated by TransAlta. |

| (6) | Other relevant categories include Category 4: Upstream transportation and distribution, Category                                                                                                                                                  
 5: Waste generated in operations, Category 6: Business travel, Category 7: Employee commuting, Category 9: Downstream transportation and distribution, and Category 10: Processing of sold products. These emissions were estimated based on best 
 available information and did not receive limited assurance by a third-party provider.                                                                                                                                                            |

Avoided Emissions In 2024, production from renewable assets resulted in the avoidance of approximately 2.8 million tonnes of CO 2e for our customers. TransAlta’s avoided emissions are defined as the sum of the displaced emissions by our renewable assets in the jurisdictions where we operate. The value is calculated as the product of the generation of electricity obtained from a renewable source (hydro, wind and solar) and the specific CO 2emissions intensity from the grid of the jurisdiction in which we operate. Avoided emissions increased in 2024 compared to 2023 primarily due to an increase in renewable fleet generation. The following table highlights our avoided emissions in million tonnes of CO 2e.

| Year ended Dec. 31          |     | 2024 |     |     | 2023 |     |     | 2022 |     |
|:----------------------------|:----|:-----|----:|:----|:-----|----:|:----|:-----|----:|
| Total GHG emissions avoided |     |      | 2.8 |     |      | 2.3 |     |      | 2.7 |

| M108 |     | TransAlta Corporation |     | 2024 Integrated Report |

Management’s Discussion and Analysis Sustainable Finance Sustainable finance is the process of taking due account of ESG considerations (e.g., climate change, biodiversity, human rights, etc.) when making investment decisions. Sustainable finance is a key pillar of TransAlta’s Climate Transition Plan. This means that we may choose to utilize pools of capital available to sustainable economic activities and projects to finance our energy transition. TransAlta deploys green and sustainable financing to build our