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12 Other Receivables (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | R$ 1,359,645 | R$ 1,088,624
Other current receivables |  | 514,185 | 426,865
Other noncurrent receivables |  | 845,460 | 661,759
Fair Value Purchase And Sale Of Power In The Active Market [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | 689,531 | 460,635
Services In Progress [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables | [1] | 260,348 | 228,593
Credits On Sales And Purchases Of Gas [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | 120,515 | 142,941
CDE Transfer [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | 60,433 | 61,898
Advance Payments To Suppliers [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables | [2] | 36,609 | 24,073
Advance Payments To Employees [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | 17,785 | 20,427
Derivatives fair value - forward contract [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | 23,308 |
Decommissioning In Progress [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | 36,855 | 21,238
Advance For Severance Estate [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | 14,484 | 15,597
Tariff Flag [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | 7,194 | 19,545
Insurance entities [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  |  | 24,574
Other receivables [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Other receivables |  | R$ 92,583 | R$ 69,103
[1] | This item refers to services currently in progress within the Company, most of which are related to the Research and Development and Energy Efficiency programs, which upon conclusion are offset against the respective liability recorded for this purpose.
[2] | Advances to suppliers provided on contractual clauses.

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