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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Property, plant and equipment (Details)	12 Months Ended
	Dec. 31, 2020
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 | Minimum
Property, plant and equipment
Estimated useful lives	20 years
Solar power systems | Maximum
Property, plant and equipment
Estimated useful lives	25 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

+ Details

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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.

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No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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