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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