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36 Related Party Transactions (Details 1)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Disclosure of transactions between related parties [line items]  
Amount endorsement/security R$ 979,234
Caiua Transmissora [Member]  
Disclosure of transactions between related parties [line items]  
Operation Financing [1]
Date issued 12.23.2013 [1]
Final maturity 02.15.2029 [1]
Amount approved R$ 84,600 [1]
Sureties and guarantees balance R$ 57,542 [1]
Interest 49.00% [1]
Amount endorsement/security R$ 5,956 [1]
Guaraciaba Transmissora [Member]  
Disclosure of transactions between related parties [line items]  
Operation Financing
Date issued 09.28.2016
Final maturity 01.15.2031
Amount approved R$ 440,000
Sureties and guarantees balance R$ 374,894
Interest 49.00%
Amount endorsement/security R$ 183,698
Guaraciaba Transmissora [Member]  
Disclosure of transactions between related parties [line items]  
Operation Debentures
Date issued 07.15.2018
Final maturity 12.15.2030
Amount approved R$ 118,000
Sureties and guarantees balance R$ 119,561
Interest 49.00%
Amount endorsement/security R$ 58,585
Mata de Santa Genebra [Member]  
Disclosure of transactions between related parties [line items]  
Operation Financing
Date issued 11.30.2017
Final maturity 07.15.2033
Amount approved R$ 1,018,500
Sureties and guarantees balance R$ 1,098,965
Interest 50.10%
Amount endorsement/security R$ 550,581
Mata de Santa Genebra [Member]  
Disclosure of transactions between related parties [line items]  
Operation Debentures
Date issued 04.15.2019
Final maturity 11.15.2030
Amount approved R$ 210,000
Sureties and guarantees balance R$ 202,767
Interest 50.10%
Amount endorsement/security R$ 101,586
Cantareira Transmissora de Energia [Member]  
Disclosure of transactions between related parties [line items]  
Operation Financing [1]
Date issued 12.28.2016 [1]
Final maturity 09.15.2032 [1]
Amount approved R$ 426,834 [1]
Sureties and guarantees balance R$ 453,020 [1]
Interest 49.00% [1]
Amount endorsement/security R$ 28,175 [1]
Cantareira Transmissora de Energia [Member]  
Disclosure of transactions between related parties [line items]  
Operation Debentures
Date issued 01.09.2018
Final maturity 08.15.2032
Amount approved R$ 100,000
Sureties and guarantees balance R$ 103,374
Interest 49.00%
Amount endorsement/security R$ 50,653
[1] Guarantee awarded of fixed amount pursuant to the contractual provisions and formal requirements of the financial institution