Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 276

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 276
---
22,000 |
| Waste reuse (tonne eq.)                    |     |      | 372,000 |     |      | 457,000 |     |      | 453,000 |
| Total waste generation (tonnes equivalent) |     |      | 384,000 |     |      | 479,000 |     |      | 506,000 |
| Percentage of total waste to landfill      |     |      |     0.3 |     |      |     0.2 |     |      |     0.4 |
| Percentage of total waste: hazardous       |     |      |     2.4 |     |      |     3.5 |     |      |     5.0 |
| Percentage of hazardous waste to landfill  |     |      |     0.0 |     |      |     0.0 |     |      |     0.0 |

Our reuse waste or byproduct waste is generally sold to third parties. Our operating teams are diligent at not only minimizing waste, but also maximizing recoverable value from waste. We have invested in equipment to capture byproducts from the combustion of coal, such as fly ash, bottom ash, gypsum and cenospheres, for subsequent sale. These non-hazardousmaterials add value to products like cement and asphalt, wallboard, paints and plastics. Coal Ash Management Given our transition off coal, we ceased producing fly ash waste in Canada at the end of 2021 and will no longer produce it past the end of 2025 in the U.S. In 2023, Lafarge Canada and TransAlta entered into an agreement designed to advance low-carbonconcrete projects in Alberta. The project repurposes landfilled fly ash, a waste product from TransAlta’s Highvale mine, which ceased operations in 2021. The ash is used to replace cement in concrete manufacturing. Turning the recovered product into something marketable, reduces the amount of cement produced and consequent emissions while offering new job and economic growth opportunities. This innovative technology contributes to reducing waste and is expected to reduce reclamation liabilities for TransAlta. Land Use Our largest land use had been associated with land disturbed by surface mining of coal, which we ceased to do in 2021. Of the three mines we operated, the Whitewood mine in Alberta is completely reclaimed and the land certification process is ongoing. Our Centralia mine in Washington State is currently in the reclamation phase and we have