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Schedule of sensitivity analysis on the power purchase and sale transactions in the active market (Details) - Post employment benefits
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
E Levation [Member]  
IfrsStatementLineItems [Line Items]  
Gains (losses) on purchase and sale of energy in active market, Baseline R$ 310,307
Gains (losses) on purchase and sale of energy in active market, Projected Scenario Probable 299,404
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 1 347,905
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 2 396,407
Public lighting rate collected  
IfrsStatementLineItems [Line Items]  
Gains (losses) on purchase and sale of energy in active market, Baseline 310,307
Gains (losses) on purchase and sale of energy in active market, Projected Scenario Probable 299,404
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 1 250,900
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 2 R$ 202,398