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38 Insurance (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Operational Risks HPP Baixo Iguacu [Member]  
Disclosure of types of insurance contracts [line items]  
End of term May 31, 2020
Insured amount R$ 2,233,183
Operational Risks HPP Colider [Member]  
Disclosure of types of insurance contracts [line items]  
End of term Jan. 11, 2020
Insured amount R$ 2,166,984
Cutia and Bento Miguel[Member]  
Disclosure of types of insurance contracts [line items]  
End of term Mar. 29, 2020
Insured amount R$ 2,165,557
Nominated Risks [Member]  
Disclosure of types of insurance contracts [line items]  
End of term Aug. 24, 2020
Insured amount R$ 2,069,590
Operational Risks UEG Araucaria [Member]  
Disclosure of types of insurance contracts [line items]  
End of term May 31, 2020
Insured amount R$ 684,130
Operational Risks Brisa Potiguar [Member]  
Disclosure of types of insurance contracts [line items]  
End of term Jun. 27, 2020
Insured amount R$ 890,763
Operational Risks HPP Governador Jayme Canet Junior [Member]  
Disclosure of types of insurance contracts [line items]  
End of term Nov. 23, 2020
Insured amount R$ 799,290
Fire Company Owned and Rented Facilities [Member]  
Disclosure of types of insurance contracts [line items]  
End of term Aug. 24, 2020
Insured amount R$ 662,791
Operational Risks Sao Bento [Member]  
Disclosure of types of insurance contracts [line items]  
End of term Jun. 27, 2020
Insured amount R$ 569,835
Multi Risk Elejor [Member]  
Disclosure of types of insurance contracts [line items]  
End of term Mar. 11, 2021
Insured amount R$ 302,984