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INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 | Amortization Rate |  | Cost |  | Amortization |  | Net
(millions of Canadian dollars) |  |  |  |  |  |  |
Customer relationships | 5.0 | % |  | 724 |  |  | (139) |  |  | 585 |
Power purchase agreements | 4.5 | % |  | 63 |  |  | (18) |  |  | 45 |
Project agreement 1 | 4.0 | % |  | 153 |  |  | (21) |  |  | 132 |
Software | 10.5 | % |  | 2,292 |  |  | (1,334) |  |  | 958 |
Other intangible assets 2 | 2.7 | % |  | 456 |  |  | (96) |  |  | 360 |
|  |  | 3,688 |  |  | (1,608) |  |  | 2,080 |
| Weighted Average |  |  |  | Accumulated |  |
December 31, 2019 | Amortization Rate |  | Cost |  | Amortization |  | Net
(millions of Canadian dollars) |  |  |  |  |  |  |
Customer relationships | 5.0 | % |  | 734 |  |  | (104) |  |  | 630 |
Power purchase agreements | 4.5 | % |  | 64 |  |  | (16) |  |  | 48 |
Project agreement 1 | 4.0 | % |  | 156 |  |  | (16) |  |  | 140 |
Software | 11.0 | % |  | 2,115 |  |  | (1,141) |  |  | 974 |
Other intangible assets 2 | 2.9 | % |  | 463 |  |  | (82) |  |  | 381 |
|  |  | 3,532 |  |  | (1,359) |  |  | 2,173 |
1 Represents a project agreement acquired from the merger of Enbridge and Spectra Energy. 2 The measurement of weighted average amortization rate excludes non-depreciable intangible assets.
Schedule of future amortization expense | The following table presents our expected amortization expense associated with existing intangible assets for the years indicated as follows:
| 2021 | 2022 | 2023 | 2024 | 2025
Forecast of amortization expense (millions of Canadian dollars) | 298 | 270 | 245 | 222 | 202

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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