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38 Insurance (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Operational Risks HPP Baixo Iguacu [member]  
Disclosure of types of insurance contracts [line items]  
End of term May 30, 2021
Insured amount R$ 2,250,207
Operational Risks HPP Colider [member]  
Disclosure of types of insurance contracts [line items]  
End of term Nov. 10, 2021
Insured amount R$ 2,166,984
Cutia and Bento Miguel[member]  
Disclosure of types of insurance contracts [line items]  
End of term Mar. 29, 2022
Insured amount R$ 2,016,287
Nominated Risks [member]  
Disclosure of types of insurance contracts [line items]  
End of term Aug. 24, 2021
Insured amount R$ 2,005,408
Operational Risks Brisa Potiguar [member]  
Disclosure of types of insurance contracts [line items]  
End of term Jun. 27, 2021
Insured amount R$ 914,610
Operational risks ueg araucaria [member]  
Disclosure of types of insurance contracts [line items]  
End of term May 31, 2021 [1]
Insured amount R$ 882,035 [1]
Fire Company Owned and Rented Facilities [member]  
Disclosure of types of insurance contracts [line items]  
End of term Aug. 24, 2021
Insured amount R$ 800,636
Operational Risks HPP Governador Jayme Canet Junior [member]  
Disclosure of types of insurance contracts [line items]  
End of term Nov. 23, 2021
Insured amount R$ 799,290
Multi Risk Elejor [member]  
Disclosure of types of insurance contracts [line items]  
End of term Mar. 11, 2022
Insured amount R$ 763,007
Operational Risks Sao Bento [member]  
Disclosure of types of insurance contracts [line items]  
End of term Jun. 27, 2021
Insured amount R$ 571,848
[1] The values of the insured of operating risks - UEG Araucaria have been translated from USD into BRL, with the current rate R$5.1967 as of December 31, 2020.