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INVENTORIES | 12 Months Ended
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Dec. 31, 2023
INVENTORIES |
INVENTORIES | 4. INVENTORIES Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, | ​ | At December 31,
​ |  | 2022 |  | 2023
​ | ​ | $ | ​ | $
Raw materials |  | 310,394 | ​ | 222,826
Work-in-process |  | 265,109 | ​ | 139,116
Finished goods |  | 948,592 | ​ | 817,699
​ |  | 1,524,095 | ​ | 1,179,641
​ Finished goods include modules of $161,138 and $112,440 as of December 31, 2022 and 2023, respectively, that allow solar energy systems to qualify for the U.S. Federal Investment Tax Credit by satisfying the 5% safe harbor method outlined in the U.S. Internal Revenue Service (“IRS”) guidance notice. In 2021, 2022 and 2023, inventory was written down by $14,070, $7,475 and $113,079, respectively, to reflect the lower of cost and net realizable value.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//330/tableOfContent + Details
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