Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 162

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 162
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.S. and decreasing gradually by 0.3 per cent per year to 4.5 per cent in 2030 for Canada. |

| (3) | 2023 Post- and pre-65 rates: decreasing gradually to                                                                                                           
 4.5 per cent by 2033 and remaining at that level thereafter for the U.S. and decreasing gradually by 0.3 per cent per year to 4.5 per cent in 2030 for Canada. |

| (4) | 2023 Post- and pre-65 rates: decreasing gradually to                                                                                                           
 4.5 per cent by 2032 and remaining at that level thereafter for the U.S. and decreasing gradually by 0.3 per cent per year to 4.5 per cent in 2030 for Canada. |

H. Sensitivity Analysis The following table outlines the estimated increase in the net defined benefit obligation assuming certain changes in key assumptions:

| As at Dec. 31, 2024                            |     | Canadian plans 
 Registered     |    |     | Supplemental |    |     | Other |   |     | U.S. plans 
 Pension    |   |
|:-----------------------------------------------|:----|:---------------|---:|:----|:-------------|---:|:----|:------|--:|:----|:-----------|:--|
| 1% decrease in the discount rate               |     |                | 28 |     |              | 10 |     |       | 1 |     |            | — |
| 1% increase in the salary scale                |     |                |  1 |     |              |  — |     |       | — |     |            | — |
| 1% increase in the health-care cost trend rate |     |                |  — |     |              |  — |     |       | 2 |     |            | — |
| 10% improvement in mortality                   
 rates                                          |     |                | 14 |     |              |  3 |     |       | — |     |            | — |

| F93 |     | TransAlta Corporation |     | 2024 Integrated Report |

Notes to the Consolidated Financial Statements 33. Joint Arrangements Joint arrangements at Dec. 31, 2024, included the following:

| Joint operations    |     | Segment        |     |  Ownership 
 (per cent) |     | Description                                                                                           |
|