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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Property, plant and equipment (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2022 | Dec. 31, 2021
Buildings |  |
Property, plant and equipment |  |
Estimated useful lives |  | 20 years
Machinery | Minimum |  |
Property, plant and equipment |  |
Estimated useful lives |  | 5 years
Machinery | Maximum |  |
Property, plant and equipment |  |
Estimated useful lives |  | 10 years
Furniture, fixtures and equipment |  |
Property, plant and equipment |  |
Estimated useful lives |  | 5 years
Motor vehicles |  |
Property, plant and equipment |  |
Estimated useful lives |  | 5 years
Solar power systems | Depreciation life |  |
Property, plant and equipment |  |
Estimated useful lives | 30 years |
Maximum useful life of transferred to an offtaker | 30 years |
Increase or decrease in depreciation expenses |  | $ 2,186
Solar power systems | Minimum |  |
Property, plant and equipment |  |
Estimated useful lives |  | 20 years
Solar power systems | Minimum | Depreciation life |  |
Property, plant and equipment |  |
Estimated useful lives | 20 years |
Solar power systems | Maximum |  |
Property, plant and equipment |  |
Estimated useful lives |  | 25 years
Solar power systems | Maximum | Depreciation life |  |
Property, plant and equipment |  |
Estimated useful lives | 25 years |

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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