Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 184

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 184
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 to service of the Kent Hills wind facilities; and |

| • |     | Higher revenue in the Gas segment with the acquisition of Heartland. |

Fuel and purchased power coststotalling $939 million, decreased by $121 million, or 11 per cent, compared to 2023, primarily due to:

| • |     | Lower purchased power costs driven by lower Mid- Columbia 
 prices on repurchases of power;                           |

| • |     | Lower fuel consumption due to higher dispatch optimization in the Gas segment in Alberta and higher 
 economic dispatch in the Energy Transition segment; and                                             |

| • |     | Lower natural gas prices. |

Carbon compliance coststotalling $112 million, were consistent with 2023, primarily due to:

| • |     | Utilization of internally generated and externally purchased emission credits to settle a portion 
 of our 2023 GHG obligation; offset by                                                             |

| • |     | An increase in the carbon price from $65 per tonne in 2023 to $80 per tonne in 2024; and |

| • |     | Higher production in the Gas segment. |

OM&A expensestotalling $655 million, increased by $116 million, or 22 per cent, compared to 2023, primarily due to:

| • |     | Penalties assessed by the Alberta Market Surveillance Administrator for self-reported 
 contraventions pertaining to hydro ancillary services provided during 2021 and 2022;  |

| • |     | Higher spend to support strategic and growth initiatives; |

| • |     | The addition of the White Rock and Horizon Hill wind facilities and the return to service of the 
 Kent Hills wind facilities;                                                                      |

| • |     | The Heartland acquisition-related transaction and restructuring costs, mainly comprising severance, 
 legal and consulting fees; and                                                                      |

| • |     | Higher spending related to the planning and design of an upgrade to our enterprise resource 
 planning (ERP) system.                                                                      |

Depreciation and amortizationtotalling $531 million, decreased by $90 million, or 14 per cent, compared to 2023, primarily due to:

| • |     | Revisions to useful lives of certain facilities in prior and current periods; partially offset by |

| • |     | Commercial operation of the White Rock and Horizon Hill wind facilities and return to service of 
 the Kent Hills wind facilities.                                                                  |

Asset impairment chargestotalling $46 million, increased by $94 million,