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Schedule of transmission service concession contract (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Contract assets, beginning R$ 5,492,797  
Contract assets, beginning 6,888,048 R$ 5,492,797
Power Transmission Concession [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 4,350,582 3,919,635
Realization of gains/losses in business combinations 722 722
Transfers to electricity grid use charges - customers (565,878) (578,147)
Transfers to property, plant and equipment (1,483) (613)
Transfers from litigations 3,376 (576)
Remuneration 864,238 781,107
Construction revenue 187,733 255,578
Construction income 4,217  
Loss from inefficiency 3,097 (7,654)
Write-offs   (23,687)
Write-offs 217,651  
Contract assets, beginning 5,060,038 4,350,582
Power Transmission Concession [Member] | Concession Assets [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 3,007,234 2,601,929
Realization of gains/losses in business combinations 722 722
Transfers to electricity grid use charges - customers (315,358) (312,120)
Transfers to property, plant and equipment (1,483) (613)
Transfers from litigations 3,376 (576)
Remuneration 621,366 489,438
Construction revenue 187,733 255,578
Construction income 4,217  
Loss from inefficiency 3,097 (7,654)
Write-offs 91,952 (23,687)
Write-offs 125,699  
Contract assets, beginning 3,632,386 3,007,234
Power Transmission Concession [Member] | R B S E Assets [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 1,343,348 1,317,706
Realization of gains/losses in business combinations  
Transfers to electricity grid use charges - customers (250,520) (266,027)
Transfers to property, plant and equipment  
Transfers from litigations  
Remuneration 242,872 291,669
Construction revenue  
Loss from inefficiency  
Contract assets, beginning R$ 1,427,652 R$ 1,343,348