XML 54 R24.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Inventory | 12 Months Ended
--- | ---
Dec. 31, 2024
Disclosure of inventories [Abstract] |
Inventory | Inventory The components of inventory are as follows:
As at Dec. 31 | 2024 | 2023 |  |
Parts, materials and supplies | 85 |  | 72 |  |  |
Coal | 27 |  | 38 |  |  |
Emission credits | 18 |  | 45 |  |  |
Natural gas | 4 |  | 2 |  |  |
Total | 134 |  | 157 |  |  |
No inventory was pledged as security for liabilities. As at Dec. 31, 2024, the Company holds 460,585 emission credits in inventory that were purchased externally with a recorded book value of $18 million (Dec. 31, 2023 — 962,548 emission credits with a recorded book value of $45 million). The Company also has 2,109,491 (Dec. 31, 2023 — 3,121,837) of internally generated eligible emission credits from the Company's Wind and Solar and Hydro segments that have no recorded book value. Emission credits can be sold externally or can be used to offset future emission obligations from our gas facilities located in Alberta, where the compliance price of carbon is expected to increase, resulting in a reduced cash cost for carbon compliance in the year of settlement. During the second quarter of 2024, the Company used 978,894 emission credits with a carrying value of $22 million to settle a portion of the 2023 carbon compliance obligation. This resulted in the Company recognizing a reduction of $42 million in carbon compliance costs. The compliance price of carbon for the 2023 obligation settled was $65 per tonne. It increased to $80 per tonne in 2024. During the second quarter of 2023, the Company settled the 2022 carbon compliance obligation in cash. The compliance price of carbon for the 2022 obligation settled was $50 per tonne.

X
- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2024-01-01 -Section Disclosure -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=2&code=ifrs-tx-2024-en-r&doctype=Standard&dita_xref=IAS02_g36-39_TI -URIDate 2024-03-27 + Details
Name: | ifrs-full_DisclosureOfInventoriesExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of inventories [Abstract] + References No definition available. + Details
Name: | tac_DisclosureofinventoriesAbstract
Namespace Prefix: | tac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration