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25. Sectorial Charges Due (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfCustomerChargesDueLineItems [Line Items]    
Customer charges due R$ 79,872 R$ 150,025
Energy Development Account (CDE)    
DisclosureOfCustomerChargesDueLineItems [Line Items]    
Customer charges due 73,549 121,912
Tariff flags    
DisclosureOfCustomerChargesDueLineItems [Line Items]    
Customer charges due 0 22,427
Global Reversal Reserve (RGR)    
DisclosureOfCustomerChargesDueLineItems [Line Items]    
Customer charges due R$ 6,323 R$ 5,686