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Operating Costs and Expenses (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Operational costs R$ (16,581,428)    
Selling expenses (152,638) R$ (175,669) R$ (186,682)
General and administrative expenses (1,078,037) (733,695) (870,858)
Other operating expenses, net (280,460) (739,635) (220,835)
Total operating costs and expenses (18,092,563) (17,254,583) (16,415,740)
Nonmanageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (10,630,554)    
Selling expenses    
General and administrative expenses    
Other operating expenses, net    
Total operating costs and expenses (10,630,554) (10,594,256) (11,977,443)
Manageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (2,352,690)    
Selling expenses (152,638)    
General and administrative expenses (1,017,523)    
Other operating expenses, net (237,398)    
Total operating costs and expenses (3,760,249) (3,290,042) (3,102,926)
Other [member]      
IfrsStatementLineItems [Line Items]      
Operational costs (3,598,184)    
Selling expenses    
General and administrative expenses (60,514)    
Other operating expenses, net (43,062)    
Total operating costs and expenses (3,701,760) (3,370,285) (1,335,371)
Electricity Purchased For Resale [Member] | Nonmanageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (7,716,190)    
Selling expenses    
General and administrative expenses    
Other operating expenses, net    
Total operating costs and expenses (7,716,190) (8,096,910) (9,503,743)
Charge Of The Main Distribution And Transmission Grid [Member] | Nonmanageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (2,896,710)    
Selling expenses    
General and administrative expenses    
Other operating expenses, net    
Total operating costs and expenses (2,896,710) (2,487,997) (2,473,700)
Materials And Supplies For Power Electricity [Member] | Nonmanageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (17,654)    
Selling expenses    
General and administrative expenses    
Other operating expenses, net    
Total operating costs and expenses (17,654) (9,349)
Personnel And Management [Member] | Manageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (1,281,861)    
Selling expenses    
General and administrative expenses (596,471)    
Other operating expenses, net    
Total operating costs and expenses (1,878,332) (977,904) (1,505,968)
Pension And Healthcare Plans [Member] | Manageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (177,275)    
Selling expenses    
General and administrative expenses (82,884)    
Other operating expenses, net    
Total operating costs and expenses (260,159) (260,197) (243,019)
Materials And Supplies [Member] | Manageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (82,419)    
Selling expenses    
General and administrative expenses (20,248)    
Other operating expenses, net    
Total operating costs and expenses (102,667) (90,541) (66,188)
Third Party Services [Member] | Manageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (735,766)    
Selling expenses (180)    
General and administrative expenses (260,366)    
Other operating expenses, net    
Total operating costs and expenses (996,312) (754,551) (636,616)
Estimated Losses Provisions And Reversals [Member] | Manageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs 177,693    
Selling expenses (109,435)    
General and administrative expenses    
Other operating expenses, net (160,493)    
Total operating costs and expenses (92,235) (717,531) (294,844)
Other Operating Costs And Expenses Net [Member] | Manageable Costs And Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operational costs (253,062)    
Selling expenses (43,023)    
General and administrative expenses (57,554)    
Other operating expenses, net (76,905)    
Total operating costs and expenses (430,544) (489,318) (356,291)
Depreciation And Amortization [Member] | Other [member]      
IfrsStatementLineItems [Line Items]      
Operational costs (1,278,464)    
Selling expenses    
General and administrative expenses (60,514)    
Other operating expenses, net (43,062)    
Total operating costs and expenses (1,382,040) (1,233,097) (1,017,292)
Construction Cost [Member] | Other [member]      
IfrsStatementLineItems [Line Items]      
Operational costs (2,319,720)    
Selling expenses    
General and administrative expenses    
Other operating expenses, net    
Total operating costs and expenses (2,319,720) (2,137,188) (1,888,622)
Hydrological Risk Renegotiation Gsf [Member] | Other [member]      
IfrsStatementLineItems [Line Items]      
Operational costs    
Selling expenses    
General and administrative expenses    
Other operating expenses, net    
Total operating costs and expenses R$ 1,570,543