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Schedule of summary of contract assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Contract Assets R$ 6,888,048 R$ 5,492,797
Current 148,488 285,682
Noncurrent 6,739,560 5,207,115
Power Distribution Service Concession 1 [Member]    
IfrsStatementLineItems [Line Items]    
Contract Assets 1,798,195 1,114,961
Piped Gas Distribution Service Concession 1 [Member]    
IfrsStatementLineItems [Line Items]    
Contract Assets 29,815 27,254
Power Transmission Concession 1 [Member]    
IfrsStatementLineItems [Line Items]    
Contract Assets R$ 5,060,038 R$ 4,350,582