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Commitments and Contingencies - Commitments (Details) $ in Millions, $ in Millions | Dec. 31, 2022 CAD ($) | Jul. 30, 2015 USD ($)
--- | --- | ---
Disclosure of Commitments [Line Items] |  |
Coal supply agreements | $ 241 |
Long-term service agreements | 328 |
Operating leases | 42 |
Growth | 446 |
TransAlta Energy Transition Bill | 6 | $ 55
Total | 1,826 |
Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 696 |
Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 67 |
2023 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply agreements | 83 |
Long-term service agreements | 51 |
Operating leases | 3 |
Growth | 446 |
TransAlta Energy Transition Bill | 6 |
Total | 655 |
2023 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 56 |
2023 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 10 |
2024 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply agreements | 87 |
Long-term service agreements | 49 |
Operating leases | 3 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 193 |
2024 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 47 |
2024 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 7 |
2025 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply agreements | 71 |
Long-term service agreements | 35 |
Operating leases | 3 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 161 |
2025 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 45 |
2025 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 7 |
2026 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply agreements | 0 |
Long-term service agreements | 32 |
Operating leases | 2 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 82 |
2026 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 45 |
2026 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 3 |
2027 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply agreements | 0 |
Long-term service agreements | 21 |
Operating leases | 2 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 70 |
2027 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 46 |
2027 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 1 |
2028 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply agreements | 0 |
Long-term service agreements | 140 |
Operating leases | 29 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 665 |
2028 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 457 |
2028 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | $ 39 |

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