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Schedule of power generation concession contract - Generation Concession Agreements (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Piped Gas Distribution Service Concession [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Balance as of December 31, 2020 | R$ 189,416 | R$ 324,385
Transfers from contract assets (Note 11.2) | 8,310 | 7,390
Transfers to intangible assets (Note 19.3) | 1,398 | (154,483)
Fair value recognition | 33,909 | 12,154
Loss on disposal | (7) | (30)
Balance as of December 31, 2021 | 233,026 | 189,416
Bonus From The Grant Of Concession Agreements Under The Quota System [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Balance as of December 31, 2020 | 671,204 | 647,984
Transfers to electricity grid use charges - customers | (74,835) | (71,087)
Interest (Note 32.1) | 134,482 | 94,307
Balance as of December 31, 2021 | 730,851 | 671,204
Generation Concession Agreements [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Balance as of December 31, 2020 | 81,202 | 69,182
Remeasurement |  | 1,518
Reversal of impairment (Note 33.4) | 2,604 | 10,502
Remeasurement | 18,414 |
Balance as of December 31, 2021 | R$ 102,220 | R$ 81,202

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