| Financial Instruments Subject to Mandatory Redemption Disclosure |
| | | At December 31, | | | | | 2016 | | 2017 | | | Accounts receivables | | | | | | | | | – from EPC services (billed) | | $ | - | | $ | 7,091,310 | | | – from EPC services (unbilled) | | | - | | | 1,835,203 | | | – from solar power project assets | | | 8,919 | | | 7,124,003 | | | – from electricity revenue generation(1) | | | 77,029 | | | 7,184,721 | | | – others | | | - | | | 76,849 | | | | | | | | | | | | Allowance for doubtful accounts | | | - | | | - | | | Accounts receivable, net | | $ | 85,948 | | $ | 23,312,086 | | | (1) | Accounts receivables from electricity revenue generation includes the receivables from the sales of green certificates. |
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