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36 Related Party Transactions (Details 1)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Disclosure of transactions between related parties [line items]  
Amount guarantees R$ 977,484
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]
Balance R$ 50,256 [1]
Interest 49.00% [1]
Amount guarantees R$ 5,956 [1]
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]
Balance R$ 431,366 [1]
Interest 49.00% [1]
Amount guarantees R$ 28,175 [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
Balance R$ 351,596
Interest 49.00%
Amount guarantees R$ 172,282
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
Balance R$ 123,946
Interest 49.00%
Amount guarantees R$ 60,734
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
Balance R$ 1,112,282
Interest 50.10%
Amount guarantees R$ 557,253
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
Balance R$ 208,014
Interest 50.10%
Amount guarantees R$ 104,215
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
Balance R$ 99,732
Interest 49.00%
Amount guarantees R$ 48,869
[1] Guarantee awarded of fixed amount pursuant to the contractual provisions and formal requirements of the financial institution.