XML 118 R85.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Revenue - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | $ 3,355 | $ 2,976 | $ 2,721
At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 52 | 63 | 53
Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 620 | 713 | 629
Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 632 | 725 | 654
Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 40 | 51 | 28
Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 32 | 32 | 19
Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 341 | (541) | 213
Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 2,273 | 2,673 | 1,734
Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 37 | 36 | 73
Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 672 | 776 | 682
Hydro | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 533 | 606 | 383
Hydro | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 14 | 1 | 0
Hydro | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 30 | 33 | 28
Hydro | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 30 | 33 | 28
Hydro | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 14 | 1 | 0
Hydro | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Hydro | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 44 | 0 | 0
Hydro | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 434 | 564 | 345
Hydro | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 11 | 8 | 10
Hydro | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 44 | 34 | 28
Wind and Solar | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 336 | 289 | 305
Wind and Solar | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 26 | 50 | 28
Wind and Solar | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 190 | 220 | 207
Wind and Solar | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 190 | 220 | 207
Wind and Solar | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 26 | 50 | 28
Wind and Solar | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Wind and Solar | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | (2) | (121) | (22)
Wind and Solar | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 104 | 119 | 35
Wind and Solar | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 18 | 21 | 57
Wind and Solar | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 216 | 270 | 235
Gas | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 1,514 | 1,209 | 1,109
Gas | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 2
Gas | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 400 | 462 | 393
Gas | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 400 | 462 | 395
Gas | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Gas | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 32 | 32 | 19
Gas | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | (172) | (821) | (118)
Gas | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 1,247 | 1,529 | 808
Gas | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 7 | 7 | 5
Gas | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 400 | 462 | 395
Energy Transition | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 751 | 714 | 709
Energy Transition | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 12 | 12 | 23
Energy Transition | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | (2) | 1
Energy Transition | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 12 | 10 | 24
Energy Transition | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Transition | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Transition | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 251 | 243 | 138
Energy Transition | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 488 | 461 | 546
Energy Transition | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 1
Energy Transition | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 12 | 10 | 24
Energy Marketing | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 220 | 160 | 211
Energy Marketing | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 220 | 160 | 211
Energy Marketing | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 1 | (2) | 4
Corporate | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | (2) | 4
Corporate | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 1 | 0 | 0
Corporate | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | $ 0 | $ 0 | $ 0

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_TimingOfTransferOfGoodsOrServicesAxis=ifrs-full_GoodsOrServicesTransferredAtPointInTimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TimingOfTransferOfGoodsOrServicesAxis=ifrs-full_GoodsOrServicesTransferredOverTimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=tac_ContractWithCustomersPowerAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=tac_ContractWithCustomersEnvironmentalCreditsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=tac_LeaseIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=tac_DerivativesIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=tac_MerchantRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=tac_OtherRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=tac_ContractWithCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_HydroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_WindandSolarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_GasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_EnergyTransitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_EnergyMarketingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |