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LOANS, FINANCING AND DEBENTURES - Relevant transactions entered in the year (Details) R$ in Thousands |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Dec. 23, 2020 USD ($) | Dec. 22, 2020 BRL (R$) | Dec. 17, 2020 USD ($) | Jun. 29, 2020 BRL (R$) | Apr. 02, 2020 USD ($) | Apr. 02, 2020 BRL (R$) | Feb. 14, 2020 USD ($) | Dec. 31, 2020 | Dec. 23, 2020 BRL (R$) | Dec. 17, 2020 BRL (R$) | Nov. 19, 2020 USD ($) | Nov. 19, 2020 BRL (R$) | Sep. 14, 2020 USD ($) | Sep. 14, 2020 BRL (R$) | Feb. 14, 2020 BRL (R$)
Export Prepayment Agreements ("EPP") | Syndicated export prepayment agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle amount |  |  |  |  |  |  | $ 850,000 |  |  |  |  |  |  |  | R$ 3,672,259
Debt instrument term |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |
Debt instrument grace period |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Export Prepayment Agreements ("EPP") | Syndicated export prepayment agreement | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread (as a percent) |  |  |  |  |  |  | 1.15% |  |  |  |  |  |  |  | 1.15%
Interest rate basis |  |  |  |  |  |  | LIBOR 3M |  |  |  |  |  |  |  |
Export Prepayment Agreements ("EPP") | Bilateral export prepayment contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle amount | $ 140,000 |  | $ 100,000 |  |  |  |  |  | R$ 709,444 | R$ 517,402 |  |  |  |  |
Debt instrument term | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 1.35% |  | 1.3825% |  |  |  |  |  | 1.35% | 1.3825% |  |  |  |  |
Revolving credit facility | Disbursements received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility |  |  |  |  | $ 500,000 | R$ 2,638,221 |  |  |  |  |  |  |  |  |
Revolving credit facility | Disbursements received | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread (as a percent) |  |  |  |  | 1.30% | 1.30% |  |  |  |  |  |  |  |  |
Interest rate basis |  |  |  |  | quarterly LIBOR | quarterly LIBOR |  |  |  |  |  |  |  |  |
BNDES | Funds raised with BNDES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle amount |  | R$ 131,774 |  | R$ 400,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  | 121 months |  | 124 months |  |  |  |  |  |  |  |  |  |  |
BNDES | Funds raised with BNDES | SELIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate basis |  |  |  | Selic interest rate, plus fixed interest of 1.96% p.a |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.96% |  |  |  |  |  |  |  |  |  |  |
BNDES | Funds raised with BNDES | TLP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread (as a percent) |  | 1.77% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate basis |  | long-term interest rate ("TLP"), plus fixed interest of 1.77% p.a |  |  |  |  |  |  |  |  |  |  |  |  |
BNDES | Funds raised with BNDES, second release |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle amount |  | R$ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
BNDES | Funds raised with BNDES, first release |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle amount |  | R$ 31,774 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes 2031 | Issuance of Sustainability-linked Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle amount |  |  |  |  |  |  |  |  |  |  | $ 500,000 | R$ 2,666,484 | $ 750,000 | R$ 3,973,831 |
Interest rate |  |  |  |  |  |  |  |  |  |  | 3.75% | 3.75% | 3.75% | 3.75% |
Yield rate |  |  |  |  |  |  |  |  |  |  | 3.10% | 3.10% | 3.95% | 3.95% |
Additional interest percentage if target is not achieved within the compliance period |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |

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