Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 259

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 259
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     | 2024 |     |     | 2015 |      |
|:----------------------------------|:----|:----------------|----:|:----|:-----|----:|:----|:-----|-----:|
| Total scope 1 and 2 GHG emissions |     |                 | 8.1 |     |      | 9.6 |     |      | 32.2 |

Scope 3 Emissions Scope 3 emissions are all indirect emissions (not included in scope 1 or 2) that occur in the value chain of the reporting company, including both upstream and downstream emissions. TransAlta’s scope 3 emissions are calculated using methodologies consistent with the GHG Protocol Corporate Value Chain (Scope 3) Accounting and Reporting Standard (Scope 3 Standard) and with reference to the additional guidance provided in the GHG Protocol Technical Guidance for Calculating Scope 3 Emissions (Scope 3 Guidance) developed by the World Resources Institute and the World Business Council for Sustainable Development. TransAlta’s scope 3 emissions include the indirect GHG emissions resulting from activities in our value chain but outside of our operational control. Of the 15 categories described in the GHG Protocol Scope 3 Guidance, four are not relevant to our business and, therefore, are not included in the calculation: Category 8: Upstream leased assets, Category 12: End-of-lifetreatment of sold products, Category 13: Downstream leased assets, and Category 14: Franchises. In 2024, we achieved our target to verify and disclose 80 per cent of TransAlta’s scope 3 emissions by 2024. Of the 15 categories described in the GHG Protocol Scope 3 Guidance, five are the most relevant to our business and together they accounted for 93 per cent of our total scope 3 emissions of approximately 3.7 million tonnes of CO 2e in 2024. They include Category 1: Purchased goods and services, Category 2: Capital goods, Category 3: Fuel and energy-related activities, Category 11: Use of sold products, and Category 15: Investments. These emissions received limited assurance by a third-party provider.

| TransAlta Corporation |     | 2024 Integrated Report |     | M107 |

Management’s Discussion and Analysis The following table details our total scope 3 GHG emissions in million tonnes of CO 2e. Some values do not sum to the indicated total due