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Revenue - Schedule of Revenue from Energy Supply (Details)
R$ in Millions, MW in Millions
 12 Months Ended
Dec. 31, 2024
BRL (R$)
MW
Dec. 31, 2023
BRL (R$)
MW
Dec. 31, 2022
BRL (R$)
MW
IfrsStatementLineItems [Line Items]      
Supply of electricity in MWh | MW 50,554 49,688 47,518
Revenue from sale of electricity R$ 29,699 R$ 27,277 R$ 26,365
Own consumption | MW 30 30 31
Unbilled revenue R$ 92 R$ 166 R$ 189
Supply of electricity including own consumption and not invoiced | MW 50,584 49,718 47,549
Supply of electricity including own consumption and not invoiced R$ 29,791 R$ 27,443 R$ 26,176
Wholesale supply to other concession holders | MW 17,192 [1] 17,328 16,777
Wholesale supply to other concession holders R$ 4,500 R$ 4,183 R$ 3,894
Wholesale supply unbilled, net R$ 50 R$ 45 R$ 88
Total | MW 67,776 67,046 64,326
Revenue from sale of electricity R$ 34,341 R$ 31,671 R$ 30,158
Residential [member] | Electricity distribution [member]      
IfrsStatementLineItems [Line Items]      
Supply of electricity in MWh | MW 14,430 [2] 13,311 11,956
Revenue from sale of electricity R$ 12,970 R$ 10,794 R$ 10,133
Industrial [member] | Electricity distribution [member]      
IfrsStatementLineItems [Line Items]      
Supply of electricity in MWh | MW 17,820 18,343 18,388
Revenue from sale of electricity R$ 5,377 R$ 5,903 R$ 5,991
Commercial, services and others [member] | Electricity distribution [member]      
IfrsStatementLineItems [Line Items]      
Supply of electricity in MWh | MW 11,802 11,443 10,410
Revenue from sale of electricity R$ 6,613 R$ 6,314 R$ 6,155
Rural [member] | Electricity distribution [member]      
IfrsStatementLineItems [Line Items]      
Supply of electricity in MWh | MW 3,578 3,507 3,359
Revenue from sale of electricity R$ 2,528 R$ 2,238 R$ 2,050
Public authorities [member] | Electricity distribution [member]      
IfrsStatementLineItems [Line Items]      
Supply of electricity in MWh | MW 1,031 973 863
Revenue from sale of electricity R$ 937 R$ 786 R$ 660
Public lighting [member] | Electricity distribution [member]      
IfrsStatementLineItems [Line Items]      
Supply of electricity in MWh | MW 973 1,056 1,138
Revenue from sale of electricity R$ 546 R$ 498 R$ 535
Public services [member] | Electricity distribution [member]      
IfrsStatementLineItems [Line Items]      
Supply of electricity in MWh | MW 920 1,055 1,404
Revenue from sale of electricity R$ 728 R$ 744 R$ 841
[1] Includes Sale Contracts in the Regulated Market (CCEARs – Contratos de Comercialização de Energia no Ambiente Regulado) through the Surplus and Deficits Offsetting Mechanism (MSCD: Mecanismo de Compensação de Sobras e Déficits), sales on the Free Market, and the revenues from management of generation assets (GAG – Gestão de Ativos da Geração) for the 18 hydroelectric plants of Lot D of Auction no 12/2015.
[2]

Data not audited by independent auditors.