XML 229 R194.htm IDEA: XBRL DOCUMENT
v3.22.4

Commitments and Contingencies - Narrative (Details) TJ in Millions, $ in Millions, $ in Millions | Dec. 31, 2022 USD ($) TJ | Dec. 31, 2022 CAD ($) TJ | Jul. 30, 2015 USD ($)
--- | --- | --- | ---
Disclosure of Commitments [Line Items] |  |  |
Total firm natural gas transportation | TJ | 75 | 75 |
TransAlta Energy Transition Bill |  | $ 6 | $ 55
Funded portion of energy bill commitment | $ | $ 50 |  |
Kent Hills Wind Rehabilitation Project |  |  |
Disclosure of Commitments [Line Items] |  |  |
Capital expenditures | $ |  | $ 120 |
Pioneer Pipeline |  |  |
Disclosure of Commitments [Line Items] |  |  |
Total firm natural gas transportation | TJ | 400 | 400 |

X
- Definition The amount of future capital expenditures that the entity is committed to make. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_CapitalCommitments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitment for Energy Bill Initiatives + References No definition available. + Details
Name: | tac_CommitmentforEnergyBillInitiatives
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition [Line Items] for Disclosure of Commitments [Table] + References No definition available. + Details
Name: | tac_DisclosureofCommitmentsLineItems
Namespace Prefix: | tac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long-term firm natural gas delivery transportation, amount transferred per day + References No definition available. + Details
Name: | tac_LongTermFirmNaturalGasDeliveryTransportationAmountTransferredPerDay
Namespace Prefix: | tac_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | instant

X
- Definition Noncurrent Prepayments for Energy Bill Commitments + References No definition available. + Details
Name: | tac_NoncurrentPrepaymentsForEnergyBillCommittments
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=tac_KentHillsWindRehabilitationProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=tac_PioneerPipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |