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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

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