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PROJECT ASSETS | 12 Months Ended
--- | ---
Dec. 31, 2020
PROJECT ASSETS |
PROJECT ASSETS | 5. PROJECT ASSETS Project assets consist of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, | ​ | At December 31,
​ |  | 2019 |  | 2020
​ | ​ | $ | ​ | $
Project assets — Acquisition cost | ​ | 55,158 | ​ | 44,549
Project assets — EPC and other cost | ​ | 1,031,976 | ​ | 1,092,917
​ | ​ | 1,087,134 | ​ | 1,137,466
Current portion | ​ | 604,083 | ​ | 747,764
Non-current portion | ​ | 483,051 | ​ | 389,702
​ The Company recorded impairment charges and write-off for project assets of $9,016, $20,194 and $369 for the years ended December 31, 2018, 2019 and 2020, respectively.

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