Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 161

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 161
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 |          | 160 |     |           | 121 |     |       | 284 |

| (1) | Includes A credit rating loans of $1 million. |

| (2) | Alternative funds include investments in infrastructure and real estate funds. |

Plan assets do not include any common shares of the Company at Dec. 31, 2024 and Dec. 31, 2023.

| F91 |     | TransAlta Corporation |     | 2024 Integrated Report |

Notes to the Consolidated Financial Statements E. Defined Benefit Obligation The present value of the obligation for the defined benefit pension and other post-employment benefit plans is as follows:

| Present value of defined benefit obligation as at Dec. 31, 2022                      |     | Registered | 345 |   |     | Supplemental | 85 |   |     | Other | 17 |   |     | Total | 447 |   |
|:-------------------------------------------------------------------------------------|:----|:-----------|----:|:--|:----|:-------------|---:|:--|:----|:------|---:|:--|:----|:------|----:|:--|
| Current service cost                                                                 |     |            |   1 |   |     |              |  1 |   |     |       |  — |   |     |       |   2 |   |
| Interest cost                                                                        |     |            |  16 |   |     |              |  4 |   |     |       |  1 |   |     |       |  21 |   |
| Benefits paid                                                                        |     |            | (36 | ) |     |              | (6 | ) |     |       | (2 | ) |     |       | (44 | ) |
| Actuarial gain arising from demographic assumptions                                  |     |            |   1 |   |     |              |  — |   |     |       |  — |   |     |       |   1 |   |
| Actuarial gain arising from financial assumptions                                    |     |            |  12 |   |     |              |  4 |   |     |       |  1 |   |     |       |  17 |   |
| Actuarial gain arising from experience adjustments                                   |     |            |   2 |   |     |              |  1 |   |     |       |