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LOANS AND BORROWINGS - Total working capital and project financing credit (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Loans and Borrowings |  |
Outstanding loans (net of debt issuance costs) | ¥ 1,230,756 | ¥ 397,213
Outstanding loans (net of debt issuance costs) | 11,489,380 | 8,768,997
Debt issuance costs | 226,085 | ¥ 273,822
Credit facilities |  |
Loans and Borrowings |  |
Total working capital and project financing credit facilities | 23,421,419 |
Unused amount | 10,505,516 |
Loan drew down | 12,915,903 |
Credit facilities | Short-term borrowing |  |
Loans and Borrowings |  |
Outstanding loans (net of debt issuance costs) | 1,229,377 |
Debt issuance costs | 1,211 |
Credit facilities | Long-term borrowing |  |
Loans and Borrowings |  |
Outstanding loans (net of debt issuance costs) | 11,489,380 |
Debt issuance costs | ¥ 195,935 |
Minimum |  |
Loans and Borrowings |  |
Terms of secured loan agreements with various financial institutions for project development and working capital purpose | 1 year |
Maximum |  |
Loans and Borrowings |  |
Terms of secured loan agreements with various financial institutions for project development and working capital purpose | 15 years |

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