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PROJECT ASSETS | 12 Months Ended
--- | ---
Dec. 31, 2021
PROJECT ASSETS |
PROJECT ASSETS | 5. PROJECT ASSETS Project assets consist of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, | ​ | At December 31,
​ |  | 2020 |  | 2021
​ | ​ | $ | ​ | $
Project assets — Acquisition cost | ​ | 44,549 | ​ | 70,651
Project assets — EPC and other cost | ​ | 1,092,917 | ​ | 956,710
​ | ​ | 1,137,466 | ​ | 1,027,361
Current portion | ​ | 747,764 | ​ | 594,107
Non-current portion | ​ | 389,702 | ​ | 433,254
​ The Company recorded impairment loss on project assets of $20,194, $369 and $17,152 for the years ended December 31, 2019, 2020 and 2021, respectively.

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