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1. Operations (Details 3)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Costa Oeste  
Statement Line Items [Line Items]  
Main activity Transmission of electricity
Date of acquisition Aug. 31, 2018
Percentage interest in shares of Copel-GeT previous 51.00%
Percentage interest in shares of Copel-GeT acquired 80.00%
Consideration transferred R$ 38,883
Marumbi  
Statement Line Items [Line Items]  
Main activity Transmission of electricity
Date of acquisition Aug. 31, 2018
Percentage interest in shares of Copel-GeT previous 49.00%
Percentage interest in shares of Copel-GeT acquired 20.00%
Consideration transferred R$ 23,811