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Schedule of regulatory charges (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
[custom:RegulatoryCharges] R$ (3,508,757)    
[custom:RegulatoryCharges1] 3,508,757 R$ 1,857,343 R$ 2,161,811
Energy Development Account C D E Energia [Member]      
IfrsStatementLineItems [Line Items]      
[custom:RegulatoryCharges] 1,737,716 1,530,998 1,654,157
Other Charges Rate Flags [Member]      
IfrsStatementLineItems [Line Items]      
[custom:RegulatoryCharges] 1,480,361 81,159 280,286
Research And Development And Energy Efficiency [Member]      
IfrsStatementLineItems [Line Items]      
[custom:RegulatoryCharges] 191,006 144,474 127,432
Global Reversion Reserve R G R Quota [Member]      
IfrsStatementLineItems [Line Items]      
[custom:RegulatoryCharges] 44,372 62,057 63,918
Energy Development Account C D E Uso [Member]      
IfrsStatementLineItems [Line Items]      
[custom:RegulatoryCharges] 42,973 27,315 25,271
Inspection Fee [Member]      
IfrsStatementLineItems [Line Items]      
[custom:RegulatoryCharges] R$ 12,329 R$ 11,340 R$ 10,747