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Net Operating Revenue (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net Operating Revenue [Line Items]      
Gross operating 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)
(-) Service tax (ISSQN) (3,644) (4,087) (6,351)
(-) Sectorial charges (3,250,371) (2,952,146) (3,669,468)
Net Revenue 22,651,036 21,479,468 20,535,341
Electricity Sales To Final Customers [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 11,383,852 10,384,872 11,392,957
(-) Pis/Pasep and Cofins (923,534)    
(-) ICMS (VAT) (1,400,957)    
(-) Service tax (ISSQN) 0    
Net Revenue 8,454,990 7,946,168 7,510,037
Amount of unbilled revenue 80,296    
Consumers Power Distribution [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 7,981,076 6,779,582 7,962,325
Free Consumers [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 2,246,579 2,723,661 2,692,303
Donations And Grants [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 1,156,197 881,629 738,329
Electricity Sales To Distributors [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 3,674,579 4,235,612 4,534,515
(-) Pis/Pasep and Cofins (476,396)    
(-) ICMS (VAT) (17,461)    
(-) Service tax (ISSQN) 0    
Net Revenue 3,120,628 3,602,788 3,814,409
Bilateral Contracts [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 1,960,568 2,112,486 2,923,509
Regulated Contracts [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 1,193,511 1,582,836 1,033,405
Electric Energy Trade Chamber CCEE [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 399,700 425,920 459,162
Effective Interest Grant Bonus [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 120,800 114,370 118,439
Use Of The Main Distribution And Transmission Grid [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 12,737,940 10,930,593 9,843,657
(-) Pis/Pasep and Cofins (1,031,028)    
(-) ICMS (VAT) (2,072,970)    
(-) Service tax (ISSQN) 0    
Net Revenue 7,048,036 6,002,192 4,828,841
Consumers [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 11,831,389 10,058,379 8,936,568
Concessionaires And Generators One [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 128,756 106,564 86,160
Operating And Maintenance Income O And M And Interest Income One [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 777,795 765,650 820,929
Construction Income [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 2,550,809 2,333,787 2,164,134
(-) Pis/Pasep and Cofins 0    
(-) ICMS (VAT) 0    
(-) Service tax (ISSQN) 0    
Net Revenue 2,550,809 2,333,787 2,164,134
Power Distribution Service Concession [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 2,427,296 2,234,542 2,048,022
Power Transmission Concession [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 123,513 99,245 116,112
Fair Value Of Assets From The Indemnity For The Concession [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 82,424 62,167 79,169
(-) Pis/Pasep and Cofins 0    
(-) ICMS (VAT) 0    
(-) Service tax (ISSQN) 0    
Net Revenue 82,424 62,167 79,169
Sectorial Financial Assets And Liabilities Result 1 [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 923,724 1,070,196 1,847,863
Other Operating Revenue One [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 620,778 629,792 522,746
Leasing And Rent [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 546,507 464,184 374,801
Fair Value In The Purchase And Sale Of Power [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 0 5,045 32,747
Income From Rendering Of Services [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues 38,238 41,891 59,048
Other Income One [Member]      
Net Operating Revenue [Line Items]      
Gross operating revenues R$ 36,033 R$ 118,672 R$ 56,150