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INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of intangible assets | The following table provides the weighted average amortization rate, gross carrying value, accumulated amortization and net carrying value for each of our major classes of intangible assets:
| Weighted Average |  |  |  |  |  | Accumulated |  |  |  |
December 31, 2018 1 | Amortization Rate |  |  | Cost |  |  | Amortization |  |  | Net |
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 5.0 | % |  | 762 |  |  | 70 |  |  | 692 |
Power purchase agreements | 4.4 | % |  | 96 |  |  | 21 |  |  | 75 |
Project agreement 2 | 4.0 | % |  | 164 |  |  | 10 |  |  | 154 |
Software | 11.4 | % |  | 1,827 |  |  | 814 |  |  | 1,013 |
Other intangible assets 3 | 4.1 | % |  | 508 |  |  | 70 |  |  | 438 |
|  |  |  | 3,357 |  |  | 985 |  |  | 2,372 |
| Weighted Average |  |  |  |  |  | Accumulated |  |  |  |
December 31, 2017 1 | Amortization Rate |  |  | Cost |  |  | Amortization |  |  | Net |
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 3.5 | % |  | 967 |  |  | 41 |  |  | 926 |
Power purchase agreements | 3.5 | % |  | 99 |  |  | 17 |  |  | 82 |
Project agreement 2 | 4.0 | % |  | 150 |  |  | 3 |  |  | 147 |
Software | 11.3 | % |  | 1,760 |  |  | 714 |  |  | 1,046 |
Other intangible assets 3 | 4.4 | % |  | 1,162 |  |  | 96 |  |  | 1,066 |
|  |  |  | 4,138 |  |  | 871 |  |  | 3,267 |
1 Certain assets were reclassified as held for sale as at December 31, 2018 and December 31, 2017 (Note 8). 2 Represents a project agreement acquired from the Merger Transaction (Note 8). 3 The measurement of weighted average amortization rate excludes non-depreciable intangible assets.
Schedule of future amortization expense | The following table presents our forecast of amortization expense associated with existing intangible assets for the years indicated as follows:
| 2019 | 2020 | 2021 | 2022 | 2023
Forecast of amortization expense (millions of Canadian dollars) | 278 | 251 | 227 | 205 | 186

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