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INTANGIBLE ASSETS (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
INTANGIBLE ASSETS |  |  |
Cost | $ 3,688 | $ 3,532 |
Accumulated Amortization | (1,608) | (1,359) |
Net | 2,080 | 2,173 |
Amortization expenses |  |  |
Amortization expense for intangible assets | 294 | $ 296 | $ 281
Expected amortization expense for intangible assets |  |  |
2021 | 298 |  |
2022 | 270 |  |
2023 | 245 |  |
2024 | 222 |  |
2025 | $ 202 |  |
Customer relationships |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 5.00% | 5.00% |
Cost | $ 724 | $ 734 |
Accumulated Amortization | (139) | (104) |
Net | $ 585 | $ 630 |
Power purchase agreements |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 4.50% | 4.50% |
Cost | $ 63 | $ 64 |
Accumulated Amortization | (18) | (16) |
Net | $ 45 | $ 48 |
Project agreement |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 4.00% | 4.00% |
Cost | $ 153 | $ 156 |
Accumulated Amortization | (21) | (16) |
Net | $ 132 | $ 140 |
Software |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 10.50% | 11.00% |
Cost | $ 2,292 | $ 2,115 |
Accumulated Amortization | (1,334) | (1,141) |
Net | $ 958 | $ 974 |
Other intangible assets |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 2.70% | 2.90% |
Cost | $ 456 | $ 463 |
Accumulated Amortization | (96) | (82) |
Net | $ 360 | $ 381 |

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