Company: TSLTF
Filing Date: 2025-12-12
Form Type: SUPPL
Source: 0001193125-25-317786
Chunk: 158

Company: TRANSALTA CORP
Filing Date: 2025-12-12
Form: SUPPL
Chunk 158
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     | Fixed       |     |                 | 1.47012 |     | Sept. 30, 2029  |     |                | 3.80 |     |             | H |

| (1) | The Series I Preferred Shares are accounted for as long-term debt. Refer to Note 26. |

| (2) | The annual dividend rate per share represents dividends declared in 2024. |

B. Dividends The following table summarizes the preferred share dividends declared in 2024 and 2023:

|               |     | Total dividends declared |     |      |
| Series        |     |                     2024 |     | 2023 |
| A             |     |                        7 |     |    7 |
| B(1)          |     |                        4 |     |    4 |
| C             |     |                       15 |     |   15 |
| D(2)          |     |                        2 |     |    2 |
| E             |     |                       15 |     |   15 |
| G             |     |                        9 |     |    8 |
| Total for the 
 year          |     |                       52 |     |   51 |

| (1) | Series B Preferred Shares pay quarterly dividends at a floating rate based on the 90-day Government of Canada Treasury Bill rate, plus 2.03 per cent. |

| (2) | Series D Preferred Shares pay quarterly dividends at a floating rate based on the 90-day Government of Canada Treasury Bill rate, plus 3.10 per cent. |

On Dec. 9, 2024, the Company declared a quarterly dividend of $0.17981 per share on the Series A preferred shares, $0.33972 per share on the Series B preferred shares, $0.36588 per share on the Series C preferred shares, $0.40568 per share on the Series D preferred shares, $0.43088 per share on the Series E preferred shares and $0.42331 per share on the Series G preferred shares, payable on March 31, 2025.

| F85 |     | TransAlta Corporation |     | 2024 Integrated Report |

Notes to the Consolidated Financial Statements 30. Accumulated Other Comprehensive Income (Loss) The components of and changes in, accumulated other comprehensive loss are as follows:

|                                                                                                                     |     | 2024 |