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Inventory (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure of inventories [Abstract] |
Disclosure Of The Components Of Inventories | The components of inventory are as follows:
As at Dec. 31 | 2021 | 2020
Parts and materials | 82 |  | 107 |
Coal | 27 |  | 83 |
Deferred stripping costs | — |  | 8 |
Natural gas | 3 |  | 2 |
Purchased emission credits(1) | 55 |  | 38 |
Total | 167 |  | 238 |
(1) Purchased emissions credits increased due to trading and compliance credits purchased, including those for Alberta compliance under the Technology Innovation and Emissions Reduction program.
Disclosure Of The Change In Inventory | The change in inventory is as follows:
| 2021 | 2020
Balance, Jan. 1 | 238 |  | 251 |
Net additions (use) | 22 |  | 26 |
Write-downs, coal | (65) |  | (37) |
Write-downs, parts and materials | (28) |  | — |
Change in foreign exchange rates | — |  | (2) |
Balance, Dec. 31 | 167 |  | 238 |

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