Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 272

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 272
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 |  64 |
| Corporate and Energy Marketing |     |      |   0 |     |      |   0 |     |      |   0 |
| Total energy use (petajoules)  |     |      | 175 |     |      | 197 |     |      | 195 |

Air Emissions Our one remaining coal-fired facility emits air emissions that we track, analyze and report to regulatory bodies. We also work on mitigation solutions depending on the type of air emission. We report our major air emissions from coal, which include NO x, SO 2, particulate matter and mercury. We continue reducing air emissions in our existing facilities through our conversion and retirement of coal units in Alberta (completed in 2021) and Washington State (planned completion by the end of 2025). In 2022, we achieved our 2026 target of 95 per cent SO 2and 80 per cent NO xemissions reductions over 2005 levels. In 2025, TransAlta set a new target “By 2030, achieve a 90 per cent reduction of SO 2emissions intensity from 2023 base year”. As per guidance from SASB, detailed air emissions disclosure is required when a facility is located within 49 kilometres of an area with a population greater than 50,000 persons. Many of our gas facilities are located in very remote and unpopulated regions, away from dense urban areas. However, our Sarnia, Windsor, Ottawa, Fort Saskatchewan and Ada gas facilities and Centralia coal facility are located within 49 kilometres of dense or urban environments. In 2024, these facilities accounted for 41 per cent of total NO x, 99 per cent of total SO 2, 31 per cent of total particulate matter and 56 per cent of total mercury. Our total air emissions in 2024 show a decrease of 18 per cent for SO 2and 18 per cent for NO xfrom 2023 levels. This is primarily due to the decrease in production from our coal facility.

| TransAlta Corporation |     | 2024 Integrated Report |     | M119 |

Management’s Discussion and Analysis The following table represents our material air emissions. Figures have been rounded for SO 2(to the nearest one hundred), NO x(to the nearest one thousand), particulate matter (to the nearest ten, when possible) and mercury (to the nearest whole number).

| Year ended Dec.