Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 352

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 352
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 Sept. 30, 2025 |     |     | Dec. 31, 2024 |
|:--------------------------------|:------|:----|---------------:|:----|:----|--------------:|
| Current portion                 |       |     |            110 |     |     |            83 |
| Non-current portion             |       |     |            871 |     |     |           850 |
| Total decommissioning and other 
 provisions                      |       |     |            981 |     |     |           933 |

A. Decommissioning and Restoration During the nine months ended Sept. 30, 2025, revisions in discount rates increased the decommissioning and restoration provision by $53 million due to lower discount rates, largely driven by decreases in long-term market benchmark rates. On average, discount rates decreased compared to 2024, with rates ranging from 4.6 to 7.6 per cent as at Sept. 30, 2025. This has resulted in a corresponding increase in PP&E of $31 million on operating assets and the recognition of $22 million of impairment charges in net (loss) earnings related to retired assets. During the nine months ended Sept. 30, 2025, the decommissioning and restoration provision decreased by $10 million primarily due to revisions in estimated cash flows for certain Hydro assets. Operating assets included in PP&E decreased by $10 million with no impact on retired assets. B. Other Provisions Other provisions include provisions arising from ongoing business activities, amounts related to commercial disputes between the Company and customers or suppliers and onerous contract provisions. Information about the expected timing of settlement and uncertainties that could impact the amount or timing of settlement has not been provided as this may impact the Company’s ability to settle the provisions in the most favourable manner.

| TransAlta Corporation |     | F27 |

16. Credit Facilities, Long-Term Debt and Lease Liabilities A. Amounts Outstanding The Company’s credit facilities are summarized in the table below:

| As at Sept. 30, 2025           |     |          |       |     | Utilized    |     |     |          |     |     |           |       |     |          |         |
| Credit facilities              |     | Facility 
 size     |       |     | Outstanding 
 letters of  
 credit(1)   |     |     | Cash     
 drawings |     |     | Available 
 capacity  |       |     | Maturity