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BORROWINGS - Long term (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
BORROWINGS |  |
Subtotal for long-term | $ 382,688 | $ 562,827
Long-term borrowings from non-banking institutions | 110,767 | 43,750
Long-term borrowings from non-banking institutions | $ 110,767 | $ 43,750
Average interest rate on long-term borrowings (as a percent) | 3.75% | 4.75%
Future principal repayment on the long-term borrowings loans |  |
2017 | $ 697,685 |
2018 | 260,379 |
2019 | 198,171 |
2020 | 19,480 |
2021 | 3,460 |
Thereafter | 11,965 |
Total | 1,191,140 |
Less: future principal repayment related to long-term borrowings, current portion | (697,685) |
Total long-term portion | 493,455 | $ 606,577
Unsecured |  |
BORROWINGS |  |
Long-term borrowings from non-banking institutions | 61,000 | 30,005
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion |  | 10,124
Borrowings secured by project assets and solar power systems |  |
BORROWINGS |  |
Long-term borrowings from non-banking institutions | 49,767 | 13,745
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | 27,100 | 162,993
Borrowings secured by property, plant and equipment |  |
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | 15,588 | 13,327
Borrowings secured by equity |  |
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | $ 340,000 | $ 376,383

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