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Operating Costs and Expenses (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operational costs R$ (17,759,792)    
Selling expenses (137,121) R$ (152,638) R$ (175,669)
General and administrative expenses (825,350) (1,078,037) (733,695)
Other operational income (expenses), net (145,727) (280,460) (739,635)
Total operating costs and expenses (18,867,990) (18,092,563) (17,254,583)
Non-manageable Costs And Expenses [Member]      
Operational costs (11,791,321)    
Selling expenses 0    
General and administrative expenses 0    
Other operational income (expenses), net 0    
Total operating costs and expenses (11,791,321) (10,630,554) (10,594,256)
Manageable Costs And Expenses [Member]      
Operational costs (2,068,036)    
Selling expenses (137,121)    
General and administrative expenses (782,152)    
Other operational income (expenses), net (100,974)    
Total operating costs and expenses (3,088,283) (3,760,249) (3,290,042)
Other [Member]      
Operational costs (3,900,435)    
Selling expenses 0    
General and administrative expenses (43,198)    
Other operational income (expenses), net (44,753)    
Total operating costs and expenses (3,988,386) (3,701,760) (3,370,285)
Electricity Purchased For Resale [Member] | Non-manageable Costs And Expenses [Member]      
Operational costs (8,924,895)    
Selling expenses 0    
General and administrative expenses 0    
Other operational income (expenses), net 0    
Total operating costs and expenses (8,924,895) (7,716,190) (8,096,910)
Charge Of The Main Distribution And Transmission Grid [Member] | Non-manageable Costs And Expenses [Member]      
Operational costs (2,865,490)    
Selling expenses 0    
General and administrative expenses 0    
Other operational income (expenses), net 0    
Total operating costs and expenses (2,865,490) (2,896,710) (2,487,997)
Materials And Supplies For Power Electricity [Member] | Non-manageable Costs And Expenses [Member]      
Operational costs (936)    
Selling expenses 0    
General and administrative expenses 0    
Other operational income (expenses), net 0    
Total operating costs and expenses (936) (17,654) (9,349)
Personnel And Management [Member] | Manageable Costs And Expenses [Member]      
Operational costs (721,764)    
Selling expenses 0    
General and administrative expenses (360,033)    
Other operational income (expenses), net 0    
Total operating costs and expenses (1,081,797) (1,878,332) (977,904)
Pension And Healthcare Plans [Member] | Manageable Costs And Expenses [Member]      
Operational costs (178,232)    
Selling expenses 0    
General and administrative expenses (81,120)    
Other operational income (expenses), net 0    
Total operating costs and expenses (259,352) (260,159) (260,197)
Materials And Supplies [Member] | Manageable Costs And Expenses [Member]      
Operational costs (69,902)    
Selling expenses 0    
General and administrative expenses (16,980)    
Other operational income (expenses), net 0    
Total operating costs and expenses (86,882) (102,667) (90,541)
Third Party Services [Member] | Manageable Costs And Expenses [Member]      
Operational costs (795,736)    
Selling expenses (2,557)    
General and administrative expenses (276,015)    
Other operational income (expenses), net 0    
Total operating costs and expenses (1,074,308) (996,312) (754,551)
Estimated Losses Provisions And Reversals [Member] | Manageable Costs And Expenses [Member]      
Operational costs (24,165)    
Selling expenses (100,730)    
General and administrative expenses 0    
Other operational income (expenses), net (220,207)    
Total operating costs and expenses (345,102) (92,235) (717,531)
Other Operating Costs And Expenses Net [Member] | Manageable Costs And Expenses [Member]      
Operational costs (278,237)    
Selling expenses (33,834)    
General and administrative expenses (48,004)    
Other operational income (expenses), net 119,233    
Total operating costs and expenses (240,842) (430,544) (489,318)
Depreciation And Amortization [Member] | Other [Member]      
Operational costs (1,377,527)    
Selling expenses 0    
General and administrative expenses (43,198)    
Other operational income (expenses), net (44,753)    
Total operating costs and expenses (1,465,478) (1,382,040) (1,233,097)
Construction Cost [Member] | Other [Member]      
Operational costs (2,522,908)    
Selling expenses 0    
General and administrative expenses 0    
Other operational income (expenses), net 0    
Total operating costs and expenses R$ (2,522,908) R$ (2,319,720) R$ (2,137,188)