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Net Operating Revenue (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net Operating Revenue [Line Items]      
Gross revenues R$ 31,974,106 R$ 29,647,019 R$ 30,385,041
PIS/Pasep and Cofins (2,577,655) (2,477,418) (2,516,317)
ICMS (VAT) (3,491,400) (2,733,900) (3,657,564)
Sectorial Charges (3,250,371)    
Service tax (3,644) (4,087) (6,351)
Net Revenue 22,651,036 21,479,468 20,535,341
Electricity Sales To Final Customers [Member]      
Net Operating Revenue [Line Items]      
Gross revenues 11,383,852 10,384,872 11,392,957
PIS/Pasep and Cofins (923,534)    
ICMS (VAT) (1,400,957)    
Sectorial Charges (604,371)    
Service tax 0    
Net Revenue 8,454,990 7,946,168 7,510,037
Electricity Sales To Distributors [Member]      
Net Operating Revenue [Line Items]      
Gross revenues 3,674,579 4,235,612 4,534,515
PIS/Pasep and Cofins (476,396)    
ICMS (VAT) (17,461)    
Sectorial Charges (60,094)    
Service tax 0    
Net Revenue 3,120,628 3,602,788 3,814,409
Use Of The Main Distribution And Transmission Grid [Member]      
Net Operating Revenue [Line Items]      
Gross revenues 12,737,940 10,930,593 9,843,657
PIS/Pasep and Cofins (1,031,028)    
ICMS (VAT) (2,072,970)    
Sectorial Charges (2,585,906)    
Service tax 0    
Net Revenue 7,048,036 6,002,192 4,828,841
Construction Income [Member]      
Net Operating Revenue [Line Items]      
Gross revenues 2,550,809 2,333,787 2,164,134
PIS/Pasep and Cofins 0    
ICMS (VAT) 0    
Sectorial Charges 0    
Service tax 0    
Net Revenue 2,550,809 2,333,787 2,164,134
Fair Value Of Assets From The Indemnity For The Concession [Member]      
Net Operating Revenue [Line Items]      
Gross revenues 82,424 62,167 79,169
PIS/Pasep and Cofins 0    
ICMS (VAT) 0    
Sectorial Charges 0    
Service tax 0    
Net Revenue 82,424 62,167 79,169
Piped Gas Distribution Service Concession [Member]      
Net Operating Revenue [Line Items]      
Gross revenues 0    
PIS/Pasep and Cofins 0    
ICMS (VAT) 0    
Sectorial Charges 0    
Service tax 0    
Net Revenue 0 0 0
Sectorial Financial Assets And Liabilities Result [Member]      
Net Operating Revenue [Line Items]      
Gross revenues 923,724    
PIS/Pasep and Cofins (85,444)    
ICMS (VAT) 0    
Sectorial Charges 0    
Service tax 0    
Net Revenue 838,280 971,203 1,676,936
Other Operating Revenue [Member]      
Net Operating Revenue [Line Items]      
Gross revenues 620,778    
PIS/Pasep and Cofins (61,253)    
ICMS (VAT) (12)    
Sectorial Charges 0    
Service tax (3,644)    
Net Revenue R$ 555,869 R$ 561,163 R$ 461,815