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9 Net Sectorial Financial Assets and Liabilities (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | R$ 355,570 | R$ 421,184 | R$ 171,609
Sectorial financial assets, noncurrent | 118,419 | 257,635 | 171,609
Sectorial financial liabilities, current |  |  | 192,819
Sectorial financial liabilities, noncurrent | (102,284) | (96,531) | R$ (90,700)
Electricity Rate Adjustment Recoverable 2018 [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 163,549 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Adjusting Portion A [Member] | Electricity Purchased For Resale - Cva Energ [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 274,495 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Adjusting Portion A [Member] | Electricity Purchased For Resale - Itaipu [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 278,072 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Adjusting Portion A [Member] | Transport Of Energy Using The Transmission System - Basic Grid [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 28,100 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Adjusting Portion A [Member] | Transport Of Energy Purchased From Itaipu [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 8,312 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Adjusting Portion A [Member] | System Service Charges - ESS [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (240,248) |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Adjusting Portion A [Member] | Energy Development Account - CDE [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 16,434 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Adjusting Portion A [Member] | Proinfa [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 3,007 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Other Financial Components [Member] | Neutrality [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 42,605 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Other Financial Components [Member] | Overcontracting [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (46,972) |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Other Financial Components [Member] | Hydrological Risk [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (175,117) |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Other Financial Components [Member] | Tariff Refunds [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (36,840) |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Other Financial Components [Member] | CVA Angra III Adjustment [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 6,272 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2018 [Member] | Other Financial Components [Member] | Others [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 5,429 |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2019 [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 237,150 | 257,635 |
Sectorial financial assets, noncurrent |  | 257,635 |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Electricity Purchased For Resale - Cva Energ [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 235,192 | 176,198 |
Sectorial financial assets, noncurrent |  | 176,198 |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Electricity Purchased For Resale - Itaipu [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 342,647 | 304,086 |
Sectorial financial assets, noncurrent |  | 304,086 |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Transport Of Energy Using The Transmission System - Basic Grid [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (47,214) | (29,307) |
Sectorial financial assets, noncurrent |  | (29,307) |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Transport Of Energy Purchased From Itaipu [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 9,937 | 7,469 |
Sectorial financial assets, noncurrent |  | 7,469 |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | System Service Charges - ESS [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (160,277) | (120,862) |
Sectorial financial assets, noncurrent |  | (120,862) |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Energy Development Account - CDE [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 98,722 | 71,325 |
Sectorial financial assets, noncurrent |  | 71,325 |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Proinfa [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 8,528 | (10) |
Sectorial financial assets, noncurrent |  | (9) |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Neutrality [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 29,690 | 40,212 |
Sectorial financial assets, noncurrent |  | 40,212 |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Overcontracting [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (116,673) | (95,722) |
Sectorial financial assets, noncurrent |  | (95,722) |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Hydrological Risk [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (119,416) | (71,958) |
Sectorial financial assets, noncurrent |  | (71,958) |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Tariff Refunds [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (43,538) | (23,796) |
Sectorial financial assets, noncurrent |  | (23,796) |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Others [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (448) |  |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Offset Of Energy Surplus/Deficit Under CCEAR Bilateral Contracts [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current |  |  |
Sectorial financial assets, noncurrent |  |  |
Electricity Rate Adjustment Recoverable 2019 [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 118,420 |  |
Sectorial financial assets, noncurrent | 118,419 |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Electricity Purchased For Resale - Cva Energ [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 15,298 |  |
Sectorial financial assets, noncurrent | 15,298 |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Electricity Purchased For Resale - Itaipu [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 225,340 |  |
Sectorial financial assets, noncurrent | 225,340 |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Transport Of Energy Using The Transmission System - Basic Grid [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 30,126 |  |
Sectorial financial assets, noncurrent | 30,126 |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Transport Of Energy Purchased From Itaipu [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 7,227 |  |
Sectorial financial assets, noncurrent | 7,227 |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | System Service Charges - ESS [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (52,336) |  |
Sectorial financial assets, noncurrent | (52,336) |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Energy Development Account - CDE [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 27,103 |  |
Sectorial financial assets, noncurrent | 27,103 |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Adjusting Portion A [Member] | Proinfa [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (30) |  |
Sectorial financial assets, noncurrent | (30) |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Neutrality [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 9,408 |  |
Sectorial financial assets, noncurrent | 9,408 |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Overcontracting [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (25,725) |  |
Sectorial financial assets, noncurrent | (25,725) |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Hydrological Risk [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (113,872) |  |
Sectorial financial assets, noncurrent | (113,872) |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Tariff Refunds [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | (24,215) |  |
Sectorial financial assets, noncurrent | (24,216) |  |
Electricity Rate Adjustment Recoverable 2019 [Member] | Other Financial Components [Member] | Offset Of Energy Surplus/Deficit Under CCEAR Bilateral Contracts [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial assets, current | 20,096 |  |
Sectorial financial assets, noncurrent | 20,096 |  |
Tariff Review 2021 [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  |  |
Sectorial financial liabilities, noncurrent | (102,284) | (96,531) |
Tariff Review 2021 [Member] | Financial Components [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  |  |
Sectorial financial liabilities, noncurrent | (102,284) | (96,531) |
Tariff Review 2021 [Member] | Financial Components [Member] | Tariff Refunds [Member] |  |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  |  |
Sectorial financial liabilities, noncurrent | R$ (102,284) | R$ (96,531) |

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