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Third party services (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Third-party services expense R$ 706,599 R$ 558,041 R$ 526,008
Maintenance Of Electrical System [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 319,162 206,688 164,510
Maintenance Of Facilities [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 103,726 97,889 102,295
Communication Processing And Transmission Of Data [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 64,772 42,244 51,919
Consumer Service [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 60,205 54,713 35,548
Meter Reading And Bill Delivery [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 52,831 48,895 45,515
Consulting And Audit [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 38,832 41,043 20,456
Other Services [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense R$ 67,071 R$ 66,569 R$ 105,765