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Schedule of sensitivity analysis of foreign currency risk (Details) - Currency risk [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]  
Financial assets, Baseline R$ 142,764
Financial assets, projected probable (14,967)
Financial liabilities, Baseline (514,908)
Financial liabilities, projected probable 18,680
Financial liabilities, projected scenario 1 (84,514)
Financial liabilities, projected scenario 2 R$ (174,284)
Loans And Financing [Member]  
IfrsStatementLineItems [Line Items]  
Financial assets and liabilities risk USD appreciation
Financial liabilities, Baseline R$ (150,572)
Financial liabilities, projected probable R$ 13,425
Suppliers Eletrobras Itaipu [Member]  
IfrsStatementLineItems [Line Items]  
Financial assets and liabilities risk USD appreciation
Financial liabilities, Baseline R$ (304,215)
Financial liabilities, projected probable 4,388
Financial liabilities, projected scenario 1 (70,568)
Financial liabilities, projected scenario 2 R$ (145,525)
Suppliers Acquisition Of Gas [Member]  
IfrsStatementLineItems [Line Items]  
Financial assets and liabilities risk USD appreciation
Financial liabilities, Baseline R$ (60,121)
Financial liabilities, projected probable 867
Financial liabilities, projected scenario 1 (13,946)
Financial liabilities, projected scenario 2 R$ (28,759)
DisclosureOfPayrollSocialChargesAndAccrualsTable [Table]  
IfrsStatementLineItems [Line Items]  
Financial assets and liabilities risk USD depreciation
Financial assets, Baseline R$ 142,764
Financial assets, projected probable R$ (14,967)