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14 Prepaid Expenses (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Prepaid expenses | R$ 37,031 | R$ 33,695
Prepaid expenses, current | 36,987 | 33,563
Prepaid expenses, noncurrent | 44 | 132
Program for incentive to alternative energy sources - Proinfa [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Prepaid expenses | 22,408 | 18,504
Insurance premiums [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Prepaid expenses | 14,453 | 11,693
Risk Premium - GSF Renegotiation [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Prepaid expenses |  | 3,180
Others [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Prepaid expenses | R$ 170 | R$ 318

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