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24 Sectorial Charges Payable (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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DisclosureOfCustomerChargesDueLineItems [Line Items] |  |
Sectorial charges due | R$ 33,712 | R$ 28,508
Energy development account (CDE) [member] |  |
DisclosureOfCustomerChargesDueLineItems [Line Items] |  |
Sectorial charges due | 5,700 | 4,104
Global reversal reserve (RGR) [member] |  |
DisclosureOfCustomerChargesDueLineItems [Line Items] |  |
Sectorial charges due | 12,446 | 12,068
Tariff flags [member] |  |
DisclosureOfCustomerChargesDueLineItems [Line Items] |  |
Sectorial charges due | R$ 15,566 | R$ 12,336

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