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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
INTANGIBLE ASSETS | 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, 2019 1 | Amortization Rate |  |  | Cost |  |  | Amortization |  |  | Net |
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 5.4 | % |  | 861 |  |  | (231 | ) |  | 630 |
Power purchase agreements | 4.5 | % |  | 64 |  |  | (16 | ) |  | 48 |
Project agreement 2 | 4.0 | % |  | 156 |  |  | (16 | ) |  | 140 |
Software | 11.2 | % |  | 1,988 |  |  | (1,014 | ) |  | 974 |
Other intangible assets 3 | 2.9 | % |  | 463 |  |  | (82 | ) |  | 381 |
|  |  |  | 3,532 |  |  | (1,359 | ) |  | 2,173 |
| Weighted Average |  |  |  |  |  | Accumulated |  |  |  |
December 31, 2018 1 | Amortization Rate |  |  | Cost |  |  | Amortization |  |  | Net |
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 5.7 | % |  | 889 |  |  | (187 | ) |  | 702 |
Power purchase agreements | 5.4 | % |  | 82 |  |  | (15 | ) |  | 67 |
Project agreement 2 | 4.0 | % |  | 164 |  |  | (10 | ) |  | 154 |
Software | 10.0 | % |  | 1,902 |  |  | (875 | ) |  | 1,027 |
Other intangible assets 3 | 2.0 | % |  | 485 |  |  | (63 | ) |  | 422 |
|  |  |  | 3,522 |  |  | (1,150 | ) |  | 2,372 |
1 Certain assets were reclassified as held for sale as at December 31, 2019 and December 31, 2018 (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. For the years ended December 31, 2019, 2018 and 2017, our amortization expense related to intangible assets totaled $296 million, $281 million and $280 million, respectively. The following table presents our expected amortization expense associated with existing intangible assets for the years indicated as follows:
| 2020 | 2021 | 2022 | 2023 | 2024
Forecast of amortization expense (millions of Canadian dollars) | 292 | 263 | 238 | 216 | 195

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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