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Risk Management Activities - Maturity Analysis of Financial Liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Bank overdraft | $ 1 | $ 3 |
Accounts payable, accrued liabilities and other current liabilities | 756 | 809 |
Principal repayments | 3,808 | 3,466 |
Exchangeable securities | 750 |  |
Interest on debt | 197 | 203 | $ 164
Dividends payable | 49 | $ 49 |
Cost |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Bank overdraft | 1 |  |
Accounts payable, accrued liabilities and other current liabilities | 756 |  |
Principal repayments | 3,692 |  |
Exchangeable securities | 750 |  |
Other risk management (assets) liabilities | 4 |  |
Lease liabilities | 151 |  |
Interest on debt | 1,488 |  |
Dividends payable | 49 |  |
Total | 7,281 |  |
Cost | Credit Facilities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 545 |  |
Cost | Debentures |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 251 |  |
Cost | Senior notes |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 1,006 |  |
Cost | Non-recourse – Hydro |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 39 |  |
Cost | Non-recourse – Wind & Solar |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 570 |  |
Cost | Non-recourse and other – Gas |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 952 |  |
Cost | Tax equity financing |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 105 |  |
Cost | Interest on exchangeable securities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Interest on debt | 223 |  |
Cost | Non-Recourse Heartland term facility |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 224 |  |
Cost | Commodity risk management (assets) liabilities(3) |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Commodity risk management (assets) liabilities(3) | 167 |  |
Cost | 2025 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Bank overdraft | 1 |  |
Accounts payable, accrued liabilities and other current liabilities | 756 |  |
Principal repayments | 566 |  |
Exchangeable securities | 0 |  |
Other risk management (assets) liabilities | 11 |  |
Lease liabilities | 4 |  |
Interest on debt | 205 |  |
Dividends payable | 49 |  |
Total | 1,590 |  |
Cost | 2025 | Credit Facilities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 400 |  |
Cost | 2025 | Debentures |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2025 | Senior notes |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2025 | Non-recourse – Hydro |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2025 | Non-recourse – Wind & Solar |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 69 |  |
Cost | 2025 | Non-recourse and other – Gas |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 58 |  |
Cost | 2025 | Tax equity financing |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 15 |  |
Cost | 2025 | Interest on exchangeable securities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Interest on debt | 53 |  |
Cost | 2025 | Non-Recourse Heartland term facility |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 24 |  |
Cost | 2025 | Commodity risk management (assets) liabilities(3) |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Commodity risk management (assets) liabilities(3) | (55) |  |
Cost | 2026 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Bank overdraft | 0 |  |
Accounts payable, accrued liabilities and other current liabilities | 0 |  |
Principal repayments | 169 |  |
Exchangeable securities | 0 |  |
Other risk management (assets) liabilities | (1) |  |
Lease liabilities | 5 |  |
Interest on debt | 178 |  |
Dividends payable | 0 |  |
Total | 418 |  |
Cost | 2026 | Credit Facilities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2026 | Debentures |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2026 | Senior notes |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2026 | Non-recourse – Hydro |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2026 | Non-recourse – Wind & Solar |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 68 |  |
Cost | 2026 | Non-recourse and other – Gas |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 61 |  |
Cost | 2026 | Tax equity financing |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 16 |  |
Cost | 2026 | Interest on exchangeable securities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Interest on debt | 53 |  |
Cost | 2026 | Non-Recourse Heartland term facility |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 24 |  |
Cost | 2026 | Commodity risk management (assets) liabilities(3) |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Commodity risk management (assets) liabilities(3) | 14 |  |
Cost | 2027 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Bank overdraft | 0 |  |
Accounts payable, accrued liabilities and other current liabilities | 0 |  |
Principal repayments | 331 |  |
Exchangeable securities | 0 |  |
Other risk management (assets) liabilities | 0 |  |
Lease liabilities | 5 |  |
Interest on debt | 169 |  |
Dividends payable | 0 |  |
Total | 571 |  |
Cost | 2027 | Credit Facilities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2027 | Debentures |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2027 | Senior notes |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2027 | Non-recourse – Hydro |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2027 | Non-recourse – Wind & Solar |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 69 |  |
Cost | 2027 | Non-recourse and other – Gas |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 65 |  |
Cost | 2027 | Tax equity financing |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 21 |  |
Cost | 2027 | Interest on exchangeable securities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Interest on debt | 53 |  |
Cost | 2027 | Non-Recourse Heartland term facility |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 176 |  |
Cost | 2027 | Commodity risk management (assets) liabilities(3) |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Commodity risk management (assets) liabilities(3) | 13 |  |
Cost | 2028 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Bank overdraft | 0 |  |
Accounts payable, accrued liabilities and other current liabilities | 0 |  |
Principal repayments | 309 |  |
Exchangeable securities | 0 |  |
Other risk management (assets) liabilities | (1) |  |
Lease liabilities | 5 |  |
Interest on debt | 151 |  |
Dividends payable | 0 |  |
Total | 528 |  |
Cost | 2028 | Credit Facilities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 145 |  |
Cost | 2028 | Debentures |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2028 | Senior notes |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2028 | Non-recourse – Hydro |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2028 | Non-recourse – Wind & Solar |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 74 |  |
Cost | 2028 | Non-recourse and other – Gas |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 66 |  |
Cost | 2028 | Tax equity financing |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 24 |  |
Cost | 2028 | Interest on exchangeable securities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Interest on debt | 52 |  |
Cost | 2028 | Non-Recourse Heartland term facility |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2028 | Commodity risk management (assets) liabilities(3) |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Commodity risk management (assets) liabilities(3) | 12 |  |
Cost | 2029 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Bank overdraft | 0 |  |
Accounts payable, accrued liabilities and other current liabilities | 0 |  |
Principal repayments | 824 |  |
Exchangeable securities | 0 |  |
Other risk management (assets) liabilities | (1) |  |
Lease liabilities | 5 |  |
Interest on debt | 136 |  |
Dividends payable | 0 |  |
Total | 982 |  |
Cost | 2029 | Credit Facilities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2029 | Debentures |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 110 |  |
Cost | 2029 | Senior notes |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 575 |  |
Cost | 2029 | Non-recourse – Hydro |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2029 | Non-recourse – Wind & Solar |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 42 |  |
Cost | 2029 | Non-recourse and other – Gas |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 74 |  |
Cost | 2029 | Tax equity financing |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 23 |  |
Cost | 2029 | Interest on exchangeable securities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Interest on debt | 12 |  |
Cost | 2029 | Non-Recourse Heartland term facility |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2029 | Commodity risk management (assets) liabilities(3) |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Commodity risk management (assets) liabilities(3) | 6 |  |
Cost | 2030 and thereafter |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Bank overdraft | 0 |  |
Accounts payable, accrued liabilities and other current liabilities | 0 |  |
Principal repayments | 1,493 |  |
Exchangeable securities | 750 |  |
Other risk management (assets) liabilities | (4) |  |
Lease liabilities | 127 |  |
Interest on debt | 649 |  |
Dividends payable | 0 |  |
Total | 3,192 |  |
Cost | 2030 and thereafter | Credit Facilities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2030 and thereafter | Debentures |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 141 |  |
Cost | 2030 and thereafter | Senior notes |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 431 |  |
Cost | 2030 and thereafter | Non-recourse – Hydro |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 39 |  |
Cost | 2030 and thereafter | Non-recourse – Wind & Solar |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 248 |  |
Cost | 2030 and thereafter | Non-recourse and other – Gas |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 628 |  |
Cost | 2030 and thereafter | Tax equity financing |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 6 |  |
Cost | 2030 and thereafter | Interest on exchangeable securities |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Interest on debt | 0 |  |
Cost | 2030 and thereafter | Non-Recourse Heartland term facility |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Principal repayments | 0 |  |
Cost | 2030 and thereafter | Commodity risk management (assets) liabilities(3) |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Commodity risk management (assets) liabilities(3) | $ 177 |  |

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Data Type: | na
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