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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2019

SUMMARY OF PRINCIPAL ACCOUNTING POLICIES

Schedule of expected useful lives of property and equipment

​

​	​	​
Buildings		20 years
Leasehold improvements		Over the shorter of the lease term or their estimated useful lives
Machinery	​	5-10 years
Furniture, fixtures and equipment	​	5 years
Motor vehicles		5 years

Schedule of useful life intangible assets

​

​	​	​
Technical know-how	​	10 years
Computer software	​	1-10 years

Schedule of disaggregation of revenue

​

​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2017		2018		2019
​		(In Thousands of U.S. Dollars)
MSS:	​	​	​	​	​	​
Revenue recognized at a point in time		2,705,985		2,095,743		2,238,310
Revenue recognized over time		6,938		73,175		242,828
​	​	​	​	​	​	​
Energy:	​	​	​	​	​	​
Revenue recognized at a point in time	​	633,195	​	1,542,906	​	668,476
Revenue recognized over time	​	44,275	​	32,688	​	50,969
​		3,390,393		3,744,512		3,200,583

Schedule of contract assets and contract liabilities

​

​	​	​	​	​	​	​	​
​		At December 31, 2018		At December31, 2019		Fluctuation
​	​	(In Thousands of U.S. Dollars)
Contract Assets							​
Accounts receivables, unbilled		38		15,256		15,218	​
​	​	​	​	​	​	​	​
Contract Liabilities				​		​	​
Advances from customers		39,024		134,806		95,782	​
Other current liabilities		51,381		20,917		(30,464)	​
​		90,405		155,723		65,318	​

Summary of the Company's other operating income, net

​

​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2017		2018		2019
​	​	$	​	$	​	$
Net gain on disposal of solar power system	​	(27,803)	​	(36,098)	​	(1,666)
Net loss on disposal of property, plant and equipment	​	1,960	​	2,565	​	1,227
Government grants	​	(6,473)	​	(11,013)	​	(10,097)
Business interruption insurance compensation	​	(15,238)	​	—	​	—
​	​	(47,554)	​	(44,546)	​	(10,536)

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