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7 Trade Accounts Receivable (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | R$ 3,182,567 | R$ 3,107,006
Current | 3,120,168 | 2,944,091
Noncurrent | 62,399 | 162,915
Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 2,697,862 |
Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 386,761 |
Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 97,944 |
CCEE [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 119,665 |
Customers [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 2,498,744 | 2,487,806
Customers [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 1,831,011 |
Customers [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 370,051 |
Customers [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 297,682 |
Customers [Member] | Residential [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 579,715 | 584,621
Customers [Member] | Residential [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 346,883 |
Customers [Member] | Residential [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 203,471 |
Customers [Member] | Residential [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 29,361 |
Customers [Member] | Industrial [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 298,719 | 365,020
Customers [Member] | Industrial [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 184,959 |
Customers [Member] | Industrial [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 30,440 |
Customers [Member] | Industrial [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 83,320 |
Customers [Member] | Commercial [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 363,986 | 372,914
Customers [Member] | Commercial [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 271,065 |
Customers [Member] | Commercial [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 63,557 |
Customers [Member] | Commercial [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 29,364 |
Customers [Member] | Rural [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 103,271 | 89,634
Customers [Member] | Rural [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 77,716 |
Customers [Member] | Rural [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 20,419 |
Customers [Member] | Rural [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 5,136 |
Customers [Member] | Public Entities [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 55,847 | 56,920
Customers [Member] | Public Entities [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 44,608 |
Customers [Member] | Public Entities [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 7,523 |
Customers [Member] | Public Entities [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 3,716 |
Customers [Member] | Public Lighting [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 38,523 | 39,114
Customers [Member] | Public Lighting [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 38,470 |
Customers [Member] | Public Lighting [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 51 |
Customers [Member] | Public Lighting [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 2 |
Customers [Member] | Public Service [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 44,983 | 42,702
Customers [Member] | Public Service [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 43,660 |
Customers [Member] | Public Service [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 882 |
Customers [Member] | Public Service [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 441 |
Customers [Member] | Unbilled - captives [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 516,203 | 478,328
Customers [Member] | Unbilled - captives [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 516,203 |
Customers [Member] | Unbilled - captives [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable |  |
Customers [Member] | Unbilled - captives [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable |  |
Customers [Member] | Energy Installments Plan - captives [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 204,192 | 197,951
Customers [Member] | Energy Installments Plan - captives [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 124,151 |
Customers [Member] | Energy Installments Plan - captives [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 16,280 |
Customers [Member] | Energy Installments Plan - captives [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 63,761 |
Customers [Member] | Low Income Subsidy-Eletrobras [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 12,174 | 11,958
Customers [Member] | Low Income Subsidy-Eletrobras [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 12,174 |
Customers [Member] | Low Income Subsidy-Eletrobras [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable |  |
Customers [Member] | Low Income Subsidy-Eletrobras [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable |  |
Customers [Member] | Other Receivables [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 148,375 | 138,116
Customers [Member] | Other Receivables [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 42,433 |
Customers [Member] | Other Receivables [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 23,362 |
Customers [Member] | Other Receivables [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 82,580 |
Customers [Member] | Free Consumers [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 132,756 | 110,528
Customers [Member] | Free Consumers [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 128,689 |
Customers [Member] | Free Consumers [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 4,066 |
Customers [Member] | Free Consumers [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 1 |
Concessionaires, Permission holder and Trading Companies [Member] | Regulated contracts [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 159,492 | 66,294
Concessionaires, Permission holder and Trading Companies [Member] | Regulated contracts [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 148,410 |
Concessionaires, Permission holder and Trading Companies [Member] | Regulated contracts [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 4,289 |
Concessionaires, Permission holder and Trading Companies [Member] | Regulated contracts [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 6,793 |
Concessionaires, Permission holder and Trading Companies [Member] | Bilateral Contracts [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 191,463 | 186,252
Concessionaires, Permission holder and Trading Companies [Member] | Bilateral Contracts [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 183,973 |
Concessionaires, Permission holder and Trading Companies [Member] | Bilateral Contracts [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 74 |
Concessionaires, Permission holder and Trading Companies [Member] | Bilateral Contracts [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 7,416 |
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 315,712 | 323,657
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 196,047 |
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable |  |
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 119,665 |
Concessionaires, Permission holder and Trading Companies [Member] | Energy Suplies [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 666,667 | 576,203
Concessionaires, Permission holder and Trading Companies [Member] | Energy Suplies [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 528,430 |
Concessionaires, Permission holder and Trading Companies [Member] | Energy Suplies [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 4,363 |
Concessionaires, Permission holder and Trading Companies [Member] | Energy Suplies [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 133,874 |
Concessionaires, Permission holder and Trading Companies [Member] | Charges From Using Transmission Grid [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 215,582 | 208,060
Concessionaires, Permission holder and Trading Companies [Member] | Charges From Using Transmission Grid [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 203,125 |
Concessionaires, Permission holder and Trading Companies [Member] | Charges From Using Transmission Grid [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 4,511 |
Concessionaires, Permission holder and Trading Companies [Member] | Charges From Using Transmission Grid [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 7,946 |
Telecommunications [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 67,304 | 62,985
Telecommunications [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 50,752 |
Telecommunications [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 10,094 |
Telecommunications [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 6,458 |
Gas Distribution [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 111,026 | 103,340
Gas Distribution [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 90,510 |
Gas Distribution [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 9,228 |
Gas Distribution [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | 11,288 |
Expected Credit Losses [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | (376,756) | R$ (331,388)
Expected Credit Losses [Member] | Balance Falling Due [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | (5,966) |
Expected Credit Losses [Member] | Overdue Up To 90 Days [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | (11,486) |
Expected Credit Losses [Member] | Less Than 1 Year [Member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade Accounts Receivable | R$ (359,304) |

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