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Net Operating Revenue (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Gross revenues R$ 29,647,019    
PIS/Pasep and Cofins (2,477,418)    
ICMS (VAT) (2,733,900)    
Sectorial Charges (2,952,146)    
Service tax (4,087)    
Net Revenue 21,479,468 R$ 20,535,341 R$ 20,976,216
Electricity Sales To Final Customers [Member]      
IfrsStatementLineItems [Line Items]      
Gross revenues 10,384,872 11,392,957 12,296,456
PIS/Pasep and Cofins (846,531)    
ICMS (VAT) (1,234,983)    
Sectorial Charges (357,190)    
Service tax    
Net Revenue 7,946,168 7,510,037 7,237,677
Electricity Sales To Distributors [Member]      
IfrsStatementLineItems [Line Items]      
Gross revenues 4,235,612 4,534,515 4,529,478
PIS/Pasep and Cofins (553,593)    
ICMS (VAT) (17,038)    
Sectorial Charges (62,193)    
Service tax    
Net Revenue 3,602,788 3,814,409 3,801,277
Use Of The Main Distribution And Transmission Grid [Member]      
IfrsStatementLineItems [Line Items]      
Gross revenues 10,930,593 9,843,657 10,088,231
PIS/Pasep and Cofins (913,793)    
ICMS (VAT) (1,481,845)    
Sectorial Charges (2,532,763)    
Service tax    
Net Revenue 6,002,192 4,828,841 5,295,074
Construction Income [Member]      
IfrsStatementLineItems [Line Items]      
Gross revenues 2,333,787 2,164,134 1,940,337
PIS/Pasep and Cofins    
ICMS (VAT)    
Sectorial Charges    
Service tax    
Net Revenue 2,333,787 2,164,134 1,940,337
Fair Value Of Assets From The Indemnity For The Concession [Member]      
IfrsStatementLineItems [Line Items]      
Gross revenues 62,167 79,169 108,733
PIS/Pasep and Cofins    
ICMS (VAT)    
Sectorial Charges    
Service tax    
Net Revenue 62,167 79,169 108,733
Sectorial Financial Assets And Liabilities Result [Member]      
IfrsStatementLineItems [Line Items]      
Gross revenues 1,070,196    
PIS/Pasep and Cofins (98,993)    
ICMS (VAT)    
Sectorial Charges    
Service tax    
Net Revenue 971,203 1,676,936 2,270,859
Other Operating Revenue [Member]      
IfrsStatementLineItems [Line Items]      
Gross revenues 629,792    
PIS/Pasep and Cofins (64,508)    
ICMS (VAT) (34)    
Sectorial Charges    
Service tax (4,087)    
Net Revenue R$ 561,163 R$ 461,815 R$ 322,259