Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 141

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 141
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3 — $57 million) of interest to PP&E 
 at a weighted average rate of 6.52 per cent (2023 — 6.3 per cent).                    |

| (3) | Includes transfers of assets upon commissioning to assets in service and other movements. |

| F69 |     | TransAlta Corporation |     | 2024 Integrated Report |

Notes to the Consolidated Financial Statements Assets under Construction During the year, the Company achieved commercial operations at the White Rock and Horizon Hill wind facilities. Costs were transferred from assets under construction to the Wind and Solar segment. As outlined in Note 17, $48 million related to the Mount Keith 132kV expansion was derecognized from assets under construction and recognized as a finance lease receivable in the first quarter of 2024. Change in Estimate — Useful Lives During 2024 and 2023, the Company adjusted the useful lives of certain assets in the Gas segment to reflect changes to the future operating expectations of the assets. The adjustment to the useful lives resulted in a decrease of $112 million (2023 — $92 million) in depreciation expense that was recognized in the Consolidated Statement of Earnings. Mothballing of Sundance Unit 6 During 2024, the Company announced it will temporarily mothball Sundance Unit 6 on April 1, 2025 for a period of up to two years depending on market conditions. The Company maintains the flexibility to return the mothballed unit to service when market fundamentals improve or opportunities to contract are secured. The unit remains available and fully operational for the first quarter of 2025. 20. Right-of-UseAssets The Company leases various properties and types of equipment. Lease contracts are typically made for fixed periods. Leases are negotiated on an individual basis and contain a wide range of terms and conditions. The lease agreements do not impose covenants, but leased assets may not be used as security for borrowing purposes. A reconciliation of the changes in the carrying amount of the right-of-useassets is as follows:

| As at Dec. 31, 2022              |     | Land | 102 |   |     | Buildings | 15 |   |     | Vehicles |  2 |   |     | Equipment |  7 |   |     | Total | 126 |   |
|:---------------------------------|:----|:-----|----:|:--|:----|:----------|---:|:--|:----|