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Trade Accounts Receivable (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable R$ 3,451,869 R$ 4,515,426
Current 3,342,050 4,433,193
Noncurrent 109,819 82,233
Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 3,009,713  
Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 321,749  
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 120,407  
Customers [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 2,374,938 3,466,094
Customers [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 1,848,620  
Customers [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 325,155  
Customers [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 201,163  
Customers [Member] | Residential [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 513,096 858,070
Customers [Member] | Residential [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 312,468  
Customers [Member] | Residential [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 172,243  
Customers [Member] | Residential [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 28,385  
Customers [Member] | Industrial [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 178,856 329,910
Customers [Member] | Industrial [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 115,555  
Customers [Member] | Industrial [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 17,612  
Customers [Member] | Industrial [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 45,689  
Customers [Member] | Commercial [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 260,260 442,902
Customers [Member] | Commercial [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 194,959  
Customers [Member] | Commercial [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 41,274  
Customers [Member] | Commercial [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 24,027  
Customers [Member] | Rural [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 101,645 151,459
Customers [Member] | Rural [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 78,099  
Customers [Member] | Rural [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 20,194  
Customers [Member] | Rural [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 3,352  
Customers [Member] | Public Entities [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 39,107 58,532
Customers [Member] | Public Entities [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 36,506  
Customers [Member] | Public Entities [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 2,200  
Customers [Member] | Public Entities [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 401  
Customers [Member] | Public Lighting [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 28,328 55,943
Customers [Member] | Public Lighting [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 28,140  
Customers [Member] | Public Lighting [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 188  
Customers [Member] | Public Lighting [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Public Service [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 39,293 62,350
Customers [Member] | Public Service [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 37,698  
Customers [Member] | Public Service [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 952  
Customers [Member] | Public Service [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 643  
Customers [Member] | Unbilled [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 462,426 948,418
Customers [Member] | Unbilled [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 462,426  
Customers [Member] | Unbilled [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Unbilled [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Energy Installments Plan [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 403,518 343,667
Customers [Member] | Energy Installments Plan [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 289,821  
Customers [Member] | Energy Installments Plan [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 43,230  
Customers [Member] | Energy Installments Plan [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 70,467  
Customers [Member] | Low Income Subsidy Eletrobras [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 28,342 17,712
Customers [Member] | Low Income Subsidy Eletrobras [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 28,342  
Customers [Member] | Low Income Subsidy Eletrobras [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Low Income Subsidy Eletrobras [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Free Consumers [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 208,631 174,495
Customers [Member] | Free Consumers [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 202,525  
Customers [Member] | Free Consumers [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 2,396  
Customers [Member] | Free Consumers [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 3,710  
Customers [Member] | Other Receivables [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 114,190 157,526
Customers [Member] | Other Receivables [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 64,835  
Customers [Member] | Other Receivables [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 24,866  
Customers [Member] | Other Receivables [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 24,489  
Customers [Member] | Bonus For Voluntary Consumption Reduction [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable (2,754) (134,890)
Customers [Member] | Bonus For Voluntary Consumption Reduction [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable (2,754)  
Customers [Member] | Bonus For Voluntary Consumption Reduction [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Bonus For Voluntary Consumption Reduction [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable  
Concessionaires And Permission Holder Energy Supplies [Member] | Bilateral Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 278,148 210,632
Concessionaires And Permission Holder Energy Supplies [Member] | Bilateral Contracts [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 276,448  
Concessionaires And Permission Holder Energy Supplies [Member] | Bilateral Contracts [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 1,400  
Concessionaires And Permission Holder Energy Supplies [Member] | Bilateral Contracts [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 300  
Concessionaires And Permission Holder Energy Supplies [Member] | Regulated Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 205,070 223,237
Concessionaires And Permission Holder Energy Supplies [Member] | Regulated Contracts [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 196,603  
Concessionaires And Permission Holder Energy Supplies [Member] | Regulated Contracts [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 3,148  
Concessionaires And Permission Holder Energy Supplies [Member] | Regulated Contracts [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 5,319  
Concessionaires And Permission Holder Energy Supplies [Member] | C C E E [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 196,627 467,529
Concessionaires And Permission Holder Energy Supplies [Member] | C C E E [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 76,962  
Concessionaires And Permission Holder Energy Supplies [Member] | C C E E [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable  
Concessionaires And Permission Holder Energy Supplies [Member] | C C E E [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 119,665  
Concessionaires And Permission Holder Energy Supplies [Member] | Energy Suplies [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 679,845 901,398
Concessionaires And Permission Holder Energy Supplies [Member] | Energy Suplies [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 550,013  
Concessionaires And Permission Holder Energy Supplies [Member] | Energy Suplies [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 4,548  
Concessionaires And Permission Holder Energy Supplies [Member] | Energy Suplies [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 125,284  
Concessionaires And Permission Holder Energy Supplies [Member] | Charges From Using Transmission Grid [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 530,259 362,070
Concessionaires And Permission Holder Energy Supplies [Member] | Charges From Using Transmission Grid [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 508,242  
Concessionaires And Permission Holder Energy Supplies [Member] | Charges From Using Transmission Grid [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 8,499  
Concessionaires And Permission Holder Energy Supplies [Member] | Charges From Using Transmission Grid [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 13,518  
Gas distribution [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 138,770 90,465
Gas distribution [member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 123,839  
Gas distribution [member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 3,440  
Gas distribution [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable 11,491  
Expected Credit Losses [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable (271,943) R$ (304,601)
Expected Credit Losses [Member] | Balance Falling Due [Member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable (21,001)  
Expected Credit Losses [Member] | Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable (19,893)  
Expected Credit Losses [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Trade Accounts Receivable R$ (231,049)