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Contract assets (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Contract assets, beginning R$ 7,672,679  
Contract assets, ending 7,605,061 R$ 7,672,679
Transmission Service Concession Contract [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 5,310,476 5,060,038
Realization of gains/losses in business combinations 722 721
Transfers to electricity grid use charges - customers (718,826) (603,317)
Transfers to property, plant and equipment (4,086) (3,822)
Transfers from litigations (458) (1,558)
Remuneration 716,030 711,648
Construction revenue 85,181 89,166
Construction income 1,410 1,458
Loss from inefficiency 12,654 56,142
Contract assets, ending 5,403,103 5,310,476
Concession Assets [Member] | Transmission Service Concession Contract [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 3,894,276 3,632,386
Realization of gains/losses in business combinations 722 721
Transfers to electricity grid use charges - customers (423,851) (389,939)
Transfers to property, plant and equipment (4,086) (3,822)
Transfers from litigations (458) (1,558)
Remuneration 521,308 509,722
Construction revenue 85,181 89,166
Construction income 1,410 1,458
Loss from inefficiency 12,654 56,142
Contract assets, ending 4,087,156 3,894,276
R B S E Assets [Member] | Transmission Service Concession Contract [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 1,416,200 1,427,652
Realization of gains/losses in business combinations
Transfers to electricity grid use charges - customers (294,975) (213,378)
Transfers to property, plant and equipment
Transfers from litigations
Remuneration 194,722 201,926
Construction revenue
Construction income
Loss from inefficiency
Contract assets, ending R$ 1,315,947 R$ 1,416,200