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Contract assets (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Contract assets, beginning R$ 6,888,048  
Contract assets, ending 7,672,679 R$ 6,888,048
Power Transmission Concession [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 5,060,038 4,350,582
Realization of gains/losses in business combinations 721 722
Transfers to electricity grid use charges - customers (603,317) (565,878)
Transfers to property, plant and equipment (3,822) (1,483)
Transfers from litigations (1,558) 3,376
Remuneration 711,648 864,238
Construction revenue 89,166 187,733
Construction income 1,458 3,097
Loss from inefficiency 56,142 217,651
Contract assets, ending 5,310,476 5,060,038
Concession Assets [Member] | Power Transmission Concession [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 3,632,386 3,007,234
Realization of gains/losses in business combinations 721 722
Transfers to electricity grid use charges - customers (389,939) (315,358)
Transfers to property, plant and equipment (3,822) (1,483)
Transfers from litigations (1,558) 3,376
Remuneration 509,722 621,366
Construction revenue 89,166 187,733
Construction income 1,458 3,097
Loss from inefficiency 56,142 125,699
Contract assets, ending 3,894,276 3,632,386
R B S E Assets [Member] | Power Transmission Concession [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 1,427,652 1,343,348
Realization of gains/losses in business combinations (0) (0)
Transfers to electricity grid use charges - customers (213,378) (250,520)
Transfers to property, plant and equipment (0) (0)
Transfers from litigations (0) (0)
Remuneration 201,926 242,872
Construction revenue (0) (0)
Construction income (0) (0)
Loss from inefficiency (0) 91,952
Contract assets, ending R$ 1,416,200 R$ 1,427,652