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28 Other Accounts Payable (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | R$ 705,286 | R$ 498,869
Other accounts payable, current |  | 235,400 | 149,407
Other accounts payable, noncurrent |  | 469,886 | 349,462
Fair value in the purchase and sale of power [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 343,406 | 251,973
Generation deviation - wind projects [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 94,089 |
Public lighting rate collected [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 48,188 | 38,805
Customers [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 44,508 | 43,024
Obligations to customers in gas sales operations [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable | [1] | 29,508 | 39,665
Aneel Order No. 084/2017 provision [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 29,174 | 26,008
Pledges in guarantee [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 16,409 | 9,257
Investment acquisition [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 14,169 | 13,294
Financial offset for the use of water resources [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 9,799 | 12,535
Reimbursements to customer contributions [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | 4,893 | 4,887
Derivatives fair value - forward contract [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  |  | 1,203
Other liabilities [member] |  |  |
DisclosureOfOtherAccountsPayableLineItems [Line Items] |  |  |
Other accounts payable |  | R$ 71,143 | R$ 58,218
[1] | Refers to amounts paid for the purchase of contracted gas volumes not yet taken by customers.

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