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Property, Plant, and Equipment - Reconciliation of the Changes in the Carrying Amount of PP&E (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | $ 5,714 | $ 5,556
End of the period | 6,020 | 5,714
Other work performed by entity and capitalised | $ 16 | $ 57
Weighted average rate | 6.52% | 6.30%
Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | $ 14,444 | $ 14,012
Additions | 311 | 875
Acquisitions (Note 4) | 412 |
Disposals | 6 | 33
Impairment (charges) reversals |  | 14
Retirement of assets | 38 | 264
Change in foreign exchange rates | 302 | (94)
Transfer to intangible assets (Note 21) | (163) |
Transfers to assets | 0 | 2
Transfers to finance lease receivable | (48) | (65)
End of the period | 15,252 | 14,444
Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | (8,730) | (8,456)
Depreciation | 518 | 585
Disposals | (2) | (30)
Retirement of assets | (33) | (235)
Change in foreign exchange rates | 162 | (47)
Transfer to intangible assets (Note 21) | (143) |
Transfers to assets |  | 1
End of the period | (9,232) | (8,730)
Assets under construction |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 1,234 | 963
End of the period | 120 | 1,234
Assets under construction | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 1,234 | 963
Additions | 279 | 869
Acquisitions (Note 4) | 11 |
Disposals | 0 | 0
Impairment (charges) reversals |  | 0
Retirement of assets | 0 | 0
Change in foreign exchange rates | 28 | (26)
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets | (1,432) | (572)
Transfers to finance lease receivable | 0 | 0
End of the period | 120 | 1,234
Assets under construction | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 0 | 0
Depreciation | 0 | 0
Disposals | 0 | 0
Retirement of assets | 0 | 0
Change in foreign exchange rates | 0 | 0
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets |  | 0
End of the period | 0 | 0
Land |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 90 | 93
End of the period | 90 | 90
Land | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 90 | 93
Additions | 0 | 0
Acquisitions (Note 4) | 0 |
Disposals | 2 | 3
Impairment (charges) reversals |  | 0
Retirement of assets | 0 | 0
Change in foreign exchange rates | 2 | 0
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets | 0 | 0
Transfers to finance lease receivable | 0 | 0
End of the period | 90 | 90
Land | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 0 | 0
Depreciation | 0 | 0
Disposals | 0 | 0
Retirement of assets | 0 | 0
Change in foreign exchange rates | 0 | 0
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets |  | 0
End of the period | 0 | 0
Hydro |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 385 | 362
End of the period | 406 | 385
Hydro | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 884 | 840
Additions | 0 | 0
Acquisitions (Note 4) | 0 |
Disposals | 0 | 0
Impairment (charges) reversals |  | 10
Retirement of assets | 10 | 7
Change in foreign exchange rates | 0 | 0
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets | 43 | 38
Transfers to finance lease receivable | 0 | 0
End of the period | 933 | 884
Hydro | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | (499) | (478)
Depreciation | 37 | 25
Disposals | 0 | 0
Retirement of assets | (9) | (4)
Change in foreign exchange rates | 0 | 0
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets |  | 0
End of the period | (527) | (499)
Wind and Solar |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 2,256 | 2,005
End of the period | 3,398 | 2,256
Wind and Solar | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 3,593 | 3,233
Additions | 0 | 0
Acquisitions (Note 4) | 0 |
Disposals | 0 | 0
Impairment (charges) reversals |  | 4
Retirement of assets | 12 | 18
Change in foreign exchange rates | 124 | (18)
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets | 1,205 | 439
Transfers to finance lease receivable | 0 | (61)
End of the period | 4,919 | 3,593
Wind and Solar | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | (1,337) | (1,228)
Depreciation | 170 | 129
Disposals | 0 | 0
Retirement of assets | (9) | (15)
Change in foreign exchange rates | 23 | (5)
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets |  | 0
End of the period | (1,521) | (1,337)
Gas generation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 1,374 | 1,718
End of the period | 1,669 | 1,374
Gas generation | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 4,423 | 4,530
Additions | 10 | 0
Acquisitions (Note 4) | 401 |
Disposals | 1 | 0
Impairment (charges) reversals |  | 0
Retirement of assets | 16 | 124
Change in foreign exchange rates | 0 | (7)
Transfer to intangible assets (Note 21) | (163) |
Transfers to assets | 163 | 50
Transfers to finance lease receivable | (48) | (4)
End of the period | 4,782 | 4,423
Gas generation | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | (3,049) | (2,812)
Depreciation | 221 | 342
Disposals | 0 | 0
Retirement of assets | (15) | (101)
Change in foreign exchange rates | 1 | (3)
Transfer to intangible assets (Note 21) | (143) |
Transfers to assets |  | (1)
End of the period | (3,113) | (3,049)
Energy Transition |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 171 | 230
End of the period | 130 | 171
Energy Transition | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 3,914 | 3,974
Additions | 0 | 0
Acquisitions (Note 4) | 0 |
Disposals | 3 | 30
Impairment (charges) reversals |  | 0
Retirement of assets | 0 | 7
Change in foreign exchange rates | 146 | (42)
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets | 14 | 16
Transfers to finance lease receivable | 0 | 0
End of the period | 4,071 | 3,914
Energy Transition | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | (3,743) | (3,744)
Depreciation | 62 | 73
Disposals | (2) | (30)
Retirement of assets | 0 | (7)
Change in foreign exchange rates | 138 | (39)
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets |  | 2
End of the period | (3,941) | (3,743)
Capital spares and other |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 204 | 185
End of the period | 207 | 204
Capital spares and other | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | 306 | 379
Additions | 22 | 6
Acquisitions (Note 4) | 0 |
Disposals | 0 | 0
Impairment (charges) reversals |  | 0
Retirement of assets | 0 | 108
Change in foreign exchange rates | 2 | (1)
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets | 7 | 31
Transfers to finance lease receivable | 0 | 0
End of the period | 337 | 306
Capital spares and other | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning of the period | (102) | (194)
Depreciation | 28 | 16
Disposals | 0 | 0
Retirement of assets | 0 | (108)
Change in foreign exchange rates | 0 | 0
Transfer to intangible assets (Note 21) | 0 |
Transfers to assets |  | 0
End of the period | (130) | (102)
Decommissioning and restoration | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Changes to decommissioning and restoration costs | 38 | (3)
Decommissioning and restoration | Assets under construction | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Changes to decommissioning and restoration costs | 0 | 0
Decommissioning and restoration | Land | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Changes to decommissioning and restoration costs | 0 | 0
Decommissioning and restoration | Hydro | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Changes to decommissioning and restoration costs | 16 | 3
Decommissioning and restoration | Wind and Solar | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Changes to decommissioning and restoration costs | 9 | 14
Decommissioning and restoration | Gas generation | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Changes to decommissioning and restoration costs | 13 | (22)
Decommissioning and restoration | Energy Transition | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Changes to decommissioning and restoration costs | 0 | 3
Decommissioning and restoration | Capital spares and other | Cost |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Changes to decommissioning and restoration costs | $ 0 | $ (1)

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2024-01-01 -Paragraph 26 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=23&code=ifrs-tx-2024-en-r&anchor=para_26_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 75 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_75_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2024-03-27 + Details
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