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1. Operations (Details 4)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Transmissora Sul Brasileira  
SummaryOfOperationsLineItems [Line Items]  
Fair value R$ 313,471
Percentage of interest transferred 20.00%
Amount of portion exchanged R$ 62,694
Consideration amount 62,694
Concession rights 0
Costa Oeste  
SummaryOfOperationsLineItems [Line Items]  
Fair value R$ 73,219
Percentage of interest transferred (49.00%)
Amount of portion exchanged R$ (35,878)
Consideration amount 38,883
Concession rights 3,005
Marumbi  
SummaryOfOperationsLineItems [Line Items]  
Fair value R$ 109,861
Percentage of interest transferred (20.00%)
Amount of portion exchanged R$ (21,971)
Consideration amount 23,811
Concession rights R$ 1,840