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14 Prepaid Expenses (Details 1)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
MW
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Disclosure of fair value measurement of assets [line items]      
Asset value to recover as renegotiation of GSF R$ 34,847 R$ 51,281 R$ 73,778
Hydrological Risk [Member]      
Disclosure of fair value measurement of assets [line items]      
Eligible amount of energy (Average MW) | MW 458.419    
Asset value to recover as renegotiation of GSF R$ 134,620    
Value of prepaid expenses to amortize with future risk premium 76,171    
Value of intangible assets amortization over the concession period R$ 58,449    
Maua [Member] | Hydrological Risk [Member]      
Disclosure of fair value measurement of assets [line items]      
Physical guarantee (Average MW) | MW 100.827    
Eligible amount of energy (Average MW) | MW 97.391    
Amortization period of prepaid expenses 01.01.2016 to 06.30.2020    
Grant extension period (intangible asset) not applicable    
Asset value to recover as renegotiation of GSF R$ 28,623    
Value of prepaid expenses to amortize with future risk premium R$ 28,623    
Foz Do Areia [Member] | Hydrological Risk [Member]      
Disclosure of fair value measurement of assets [line items]      
Physical guarantee (Average MW) | MW 576.000    
Eligible amount of energy (Average MW) | MW 226.705    
Amortization period of prepaid expenses 01.01.2016 to 12.31.2016    
Grant extension period (intangible asset) 05.24.2023 to 09.17.2023    
Asset value to recover as renegotiation of GSF R$ 66,628    
Value of prepaid expenses to amortize with future risk premium 17,222    
Value of intangible assets amortization over the concession period R$ 49,406    
Santa Clara and Fundoa [Member] | Hydrological Risk [Member]      
Disclosure of fair value measurement of assets [line items]      
Physical guarantee (Average MW) | MW 135.400    
Eligible amount of energy (Average MW) | MW 134.323    
Amortization period of prepaid expenses 01.01.2016 to 04.22.2019    
Grant extension period (intangible asset) 10.25.2036 to 05.28.2037    
Asset value to recover as renegotiation of GSF R$ 39,369    
Value of prepaid expenses to amortize with future risk premium 30,326    
Value of intangible assets amortization over the concession period R$ 9,043