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Operating Costs and Expenses (Details 3) - BRL (R$) R$ in Thousands | 12 Months Ended
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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

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