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10 Accounts Receivables - Concessions (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accounts Receivable Concessions [Line Items] |  |
Accounts receivable related to the concession | R$ 2,617,638 | R$ 2,550,691
Accounts receivable related to the concession, current | 58,842 | 53,177
Accounts receivable related to the concession, noncurrent | 2,558,796 | 2,497,514
Power Distribution Service Concession [Member] |  |
Accounts Receivable Concessions [Line Items] |  |
Accounts receivable related to the concession | 836,818 | 783,023
Piped Gas Distribution Service Concession [Member] |  |
Accounts Receivable Concessions [Line Items] |  |
Accounts receivable related to the concession | 324,385 | 322,259
Bonus From The Grant Of Concession Agreements Under The Quota System [Member] |  |
Accounts Receivable Concessions [Line Items] |  |
Accounts receivable related to the concession | 647,984 | 625,772
Remeasurement Of RBSE Financial Assets [Member] |  |
Accounts Receivable Concessions [Line Items] |  |
Accounts receivable related to the concession | 739,269 | 753,826
Generation Concession Agreements [Member] |  |
Accounts Receivable Concessions [Line Items] |  |
Accounts receivable related to the concession | R$ 69,182 | R$ 65,811

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