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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Project assets
Solar power systems reclassified to project assets	$ 111.3
Project assets reclassified to solar power systems	$ 347.2	$ 98.0
Buildings
Property, plant and equipment
Estimated useful lives	20 years
Machinery and equipment | Minimum
Property, plant and equipment
Estimated useful lives	5 years
Machinery and equipment | 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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Represents the amount of project assets reclassified to solar power systems.

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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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