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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