Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 134

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 134
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 31, 2024, associated with the Company’s commodity derivative instruments used in generation hedging activities was $8 million (2023 — $23 million, 2022 — $97 million). For positions and economic hedges that do not meet hedge accounting requirements or for short-term optimization transactions such as buybacks entered into to offset existing hedge positions, these transactions are marked to the market value with changes in market prices associated with these transactions affecting net earnings in the period in which the price change occurs. VaR at Dec. 31, 2024, associated with these transactions was $13 million (2023 — $16 million, 2022 — $45 million). For the market risk related to long-term power sale and long-term wind energy sales contracts, refer to the Level III measurements table and the related unobservable inputs and sensitivities in Note 14(B)(II). iii. Commodity Price Risk Management – Hedges At Dec. 31, 2024, the Company had no outstanding commodity derivative instruments designated as hedging instruments, except for the long-term power sale - U.S. contract. iv. Commodity Price Risk Management – Non-Hedges The Company’s outstanding commodity derivative instruments not designated as hedging instruments are as follows:

| As at Dec. 31      |     | 2024     |        |     |           |        |     | 2023     |        |     |           |         |
|:-------------------|:----|:---------|-------:|:----|:----------|-------:|:----|:---------|-------:|:----|:----------|--------:|
| Type               
 (thousands)        |     | Notional 
 amount   
 sold     |        |     | Notional  
 amount    
 purchased |        |     | Notional 
 amount   
 sold     |        |     | Notional  
 amount    
 purchased |         |
| Electricity (MWh)  |     |          | 47,593 |     |           |  8,416 |     |          | 54,043 |     |           |  12,628 |
| Natural gas (GJ)   |     |          |  2,122 |     |           | 79,194 |     |          | 50,949 |     |           | 209,348 |
| Transmission (MWh) |     |          |      — |     |           |    292 |     |          |      — |