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Operating Costs and Expenses (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Third-party services expense R$ 996,312 R$ 754,551 R$ 636,616
Maintenance Of Electrical System [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 430,954 311,553 266,601
Maintenance Of Facilities [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 117,981 89,741 97,056
Communication Processing And Transmission Of Data [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 107,818 91,101 64,273
Consumer Service [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 100,574 83,203 66,733
Consulting And Audit [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 81,904 49,882 35,429
Meter Reading And Bill Delivery [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense 58,734 53,660 52,831
Other Services [Member]      
IfrsStatementLineItems [Line Items]      
Third-party services expense R$ 98,347 R$ 75,411 R$ 53,693