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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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- Definition Represents the amount of project assets reclassified to solar power systems. + References No definition available. + Details
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- Definition Represents the amount of solar power systems reclassified to project assets. + References 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. + References No definition available. + Details
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