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Operating Costs and Expenses (Details 6) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating costs and expenses [Line Items]      
Other gains (losses) R$ 240,842 R$ 430,544 R$ 489,318
Financial Offset For The Use Of Water Resources [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 173,318 152,604 142,270
Insurance [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 41,111 48,914 41,505
Advertising and publicity [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 34,546 31,254 28,909
Collection Charge [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 33,831 43,022 47,923
Compensation [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 30,435 21,699 14,703
Leasing And Rent [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 28,045 30,528 33,316
Taxes [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 23,358 23,463 59,188
Aneel Inspection Fee [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 19,458 18,248 15,683
Donations Contributions Grants Tax Incentives [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 4,434 8,808 6,521
Fair Value Of Power Generation Concession Assets [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) 0 0 26,451
Net Losses In The Decommissioning And Disposal Of Assets [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) (225,683) 45,596 35,483
Other Net Income Costs And Expenses [Member]      
Operating costs and expenses [Line Items]      
Other gains (losses) R$ 77,989 R$ 6,408 R$ 37,366