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INTANGIBLE ASSETS (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
INTANGIBLE ASSETS |  |  |
Cost | $ 3,357 | $ 4,138 |
Accumulated Amortization | 985 | 871 |
Net | 2,372 | 3,267 |
Amortization expenses |  |  |
Amortization expense for intangible assets | 281 | $ 280 | $ 177
Expected amortization expense for intangible assets |  |  |
2019 | 278 |  |
2020 | 251 |  |
2021 | 227 |  |
2022 | 205 |  |
2023 | $ 186 |  |
Customer relationships |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 5.00% | 3.50% |
Cost | $ 762 | $ 967 |
Accumulated Amortization | 70 | 41 |
Net | $ 692 | $ 926 |
Power purchase agreements |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 4.40% | 3.50% |
Cost | $ 96 | $ 99 |
Accumulated Amortization | 21 | 17 |
Net | $ 75 | $ 82 |
Project agreement |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 4.00% | 4.00% |
Cost | $ 164 | $ 150 |
Accumulated Amortization | 10 | 3 |
Net | $ 154 | $ 147 |
Software |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 11.40% | 11.30% |
Cost | $ 1,827 | $ 1,760 |
Accumulated Amortization | 814 | 714 |
Net | $ 1,013 | $ 1,046 |
Other intangible assets3 |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 4.10% | 4.40% |
Cost | $ 508 | $ 1,162 |
Accumulated Amortization | 70 | 96 |
Net | $ 438 | $ 1,066 |

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