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Net Operating Revenue (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Gross operating revenues R$ 29,647,019    
(-) Pis/Pasep and Cofins (2,477,418)    
(-) ICMS (VAT) (2,733,900)    
(-) Service tax (ISSQN) (4,087)    
Electricity Sales To Final Customers [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 10,384,872 R$ 11,392,957 R$ 12,296,456
(-) Pis/Pasep and Cofins (846,531)    
(-) ICMS (VAT) (1,234,983)    
(-) Service tax (ISSQN)    
Consumers Power Distribution [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 6,779,582 7,962,325  
Free Consumers [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,723,661 2,692,303 2,203,320
Donations And Grants [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 881,629 738,329 671,752
Electricity Sales To Distributors [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 4,235,612 4,534,515 4,529,478
(-) Pis/Pasep and Cofins (553,593)    
(-) ICMS (VAT) (17,038)    
(-) Service tax (ISSQN)    
Bilateral Contracts [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,112,486 2,923,509 2,390,859
Regulated Contracts [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,582,836 1,033,405 1,026,124
Electric Energy Trade Chamber CCEE [member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 425,920 459,162 978,013
Effective Interest Grant Bonus [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 114,370 118,439 134,482
Use Of The Main Distribution And Transmission Grid [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 10,930,593 9,843,657 10,088,231
(-) Pis/Pasep and Cofins (913,793)    
(-) ICMS (VAT) (1,481,845)    
(-) Service tax (ISSQN)    
Consumers [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 10,058,379 8,936,568  
Concessionaires And Generators One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 106,564 86,160 79,493
Operating And Maintenance Income O And M And Interest Income One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 765,650 820,929 1,071,975
Construction Income [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,333,787 2,164,134 1,940,337
(-) Pis/Pasep and Cofins    
(-) ICMS (VAT)    
(-) Service tax (ISSQN)    
Power Distribution Service Concession [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,234,542 2,048,022 1,700,889
Power Transmission Concession [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 99,245 116,112 239,448
Fair Value Of Assets From The Indemnity For The Concession [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 62,167 79,169 108,733
(-) Pis/Pasep and Cofins    
(-) ICMS (VAT)    
(-) Service tax (ISSQN)    
Sectorial Financial Assets And Liabilities Result 1 [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,070,196 1,847,863 2,502,324
Other Operating Revenue One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 629,792 522,746 358,902
Leasing And Rent [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 464,184 374,801 253,049
Fair Value In The Purchase And Sale Of Power [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 5,045 32,747
Income From Rendering Of Services [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 41,891 59,048 91,901
Other Income One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 118,672 56,150 13,952
Gross Operating Revenue One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 29,647,019 30,385,041 31,824,461
Pis Pasep And Cofins One [Member]      
IfrsStatementLineItems [Line Items]      
(-) Pis/Pasep and Cofins (2,477,418) (2,516,317) (2,532,675)
ICMS VAT [member]      
IfrsStatementLineItems [Line Items]      
(-) ICMS (VAT) (2,733,900) (3,657,564) (4,822,236)
Service Tax ISSQN [member]      
IfrsStatementLineItems [Line Items]      
(-) Service tax (ISSQN) (4,087) (6,351) (6,992)
Sectorial Charges One [Member]      
IfrsStatementLineItems [Line Items]      
(-) Sectorial charges (2,952,146) (3,669,468) (3,486,342)
Net Operating Revenue One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues R$ 21,479,468 R$ 20,535,341 R$ 20,976,216