Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 179

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 179
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 in the consolidated statements of financial position under IFRS. |

| M6 |     | TransAlta Corporation |     | 2024 Integrated Report |

Management’s Discussion and Analysis Operating Performance Availability The following table provides availability (%) by segment:

| Year ended Dec. 31   |     | 2024 |      |     | 2023 |      |     | 2022 |      |
|:---------------------|:----|:-----|-----:|:----|:-----|-----:|:----|:-----|-----:|
| Hydro                |     |      | 90.7 |     |      | 90.8 |     |      | 96.7 |
| Wind and Solar       |     |      | 93.4 |     |      | 86.9 |     |      | 83.8 |
| Gas                  |     |      | 92.2 |     |      | 91.6 |     |      | 94.6 |
| Energy Transition(1) |     |      | 80.0 |     |      | 79.8 |     |      | 77.2 |
| Availability         
 (%)                  |     |      | 91.2 |     |      | 88.8 |     |      | 89.8 |

| (1) | Availability adjusted for dispatch optimization for the year ended 2022 was 79 per cent. |

Availability is an important measure for the Company as it represents the percentage of time a facility is available to produce electricity and is an indicator of the overall performance of the fleet. The Company schedules dedicated time (planned outages) to maintain, repair or make improvements to the facilities at a time that will minimize the impact to operations. In high price environments, actual outage schedules may change to accelerate the return to service of the unit. 2024 versus 2023 Availability for the year ended Dec. 31, 2024, was 91.2 per cent, compared to 88.8 per cent in 2023, consistent with management’s expectations. Higher availability compared to the prior year was primarily due to:

| • |     | The addition of the White Rock and Horizon Hill wind facilities; and |

| • |     | The return to service of the Kent Hills wind facilities. |

2023 versus 2022 Availability for the year ended Dec. 31, 2023, was 88.8 per cent, compared to