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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 4,600 | $ 4,000 | $ 3,800
Chapman Ranch Wind Farm |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment loss |  | $ 251 |
Magic Valley Wind Farm |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment loss |  |  | 227
Bakken Pipeline System |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment loss |  |  | $ 183

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