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9 Net Sectorial Financial Assets and Liabilities (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | R$ 173,465 | R$ 355,570
Sectorial financial assets, noncurrent | 173,465 | 118,419
Sectorial financial liabilities, current | (188,709) |
Sectorial financial liabilities, noncurrent |  | (102,284)
Electricity rate adjustment recoverable 2021 [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | 173,465 |
Sectorial financial assets, noncurrent | 173,465 |
Electricity rate adjustment recoverable 2021 [member] | Adjusting portion A [member] | Electricity purchased for resale - cva energ [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | (54,864) |
Sectorial financial assets, noncurrent | (54,864) |
Electricity rate adjustment recoverable 2021 [member] | Adjusting portion A [member] | Electricity purchased for resale - itaipu [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | 231,588 |
Sectorial financial assets, noncurrent | 231,588 |
Electricity rate adjustment recoverable 2021 [member] | Adjusting portion A [member] | Transport of energy using the transmission system - basic grid [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | 88,137 |
Sectorial financial assets, noncurrent | 88,137 |
Electricity rate adjustment recoverable 2021 [member] | Adjusting portion A [member] | Transport of energy purchased from itaipu [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | 9,766 |
Sectorial financial assets, noncurrent | 9,766 |
Electricity rate adjustment recoverable 2021 [member] | Adjusting portion A [member] | System service charges - ESS [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | 11,266 |
Sectorial financial assets, noncurrent | 11,266 |
Electricity rate adjustment recoverable 2021 [member] | Adjusting portion A [member] | Energy development account - CDE [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | (903) |
Sectorial financial assets, noncurrent | (903) |
Electricity rate adjustment recoverable 2021 [member] | Adjusting portion A [member] | Proinfa [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | (89) |
Sectorial financial assets, noncurrent | (89) |
Electricity rate adjustment recoverable 2021 [member] | Other financial components [member] | Neutrality [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | 27,923 |
Sectorial financial assets, noncurrent | 27,923 |
Electricity rate adjustment recoverable 2021 [member] | Other financial components [member] | Overcontracting [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | 78,836 |
Sectorial financial assets, noncurrent | 78,836 |
Electricity rate adjustment recoverable 2021 [member] | Other financial components [member] | Hydrological risk [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | (143,147) |
Sectorial financial assets, noncurrent | (143,147) |
Electricity rate adjustment recoverable 2021 [member] | Other financial components [member] | Tariff refunds [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | (76,144) |
Sectorial financial assets, noncurrent | (76,144) |
Electricity rate adjustment recoverable 2021 [member] | Other financial components [member] | Other [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current | 1,096 |
Sectorial financial assets, noncurrent | 1,096 |
Electricity rate adjustment recoverable 2019 [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | 237,150
Sectorial financial assets, noncurrent |  |
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
Sectorial financial assets, noncurrent |  |
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
Sectorial financial assets, noncurrent |  |
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)
Sectorial financial assets, noncurrent |  |
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
Sectorial financial assets, noncurrent |  |
Electricity rate adjustment recoverable 2019 [member] | Adjusting portion A [member] | System service charges - ESS [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (160,277)
Sectorial financial assets, noncurrent |  |
Electricity rate adjustment recoverable 2019 [member] | Adjusting portion A [member] | Energy development account - CDE [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | 98,722
Sectorial financial assets, noncurrent |  |
Electricity rate adjustment recoverable 2019 [member] | Adjusting portion A [member] | Proinfa [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | 8,528
Sectorial financial assets, noncurrent |  |
Electricity rate adjustment recoverable 2019 [member] | Other financial components [member] | Neutrality [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | 29,690
Sectorial financial assets, noncurrent |  |
Electricity rate adjustment recoverable 2019 [member] | Other financial components [member] | Overcontracting [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (116,673)
Sectorial financial assets, noncurrent |  |
Electricity rate adjustment recoverable 2019 [member] | Other financial components [member] | Hydrological risk [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (119,416)
Sectorial financial assets, noncurrent |  |
Electricity rate adjustment recoverable 2019 [member] | Other financial components [member] | Tariff refunds [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (43,538)
Sectorial financial assets, noncurrent |  |
Electricity rate adjustment recoverable 2019 [member] | Other financial components [member] | Other [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (448)
Sectorial financial assets, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | 118,420
Sectorial financial assets, noncurrent |  | 118,419
Sectorial financial liabilities, current | (188,709) |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [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
Sectorial financial liabilities, current | 9,675 |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [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 2020 [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
Sectorial financial liabilities, current | (603) |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [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
Sectorial financial liabilities, current | 214 |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [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)
Sectorial financial liabilities, current | (3,401) |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [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
Sectorial financial liabilities, current | (66) |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [member] | Adjusting portion A [member] | Proinfa [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (30)
Sectorial financial assets, noncurrent |  | (30)
Sectorial financial liabilities, current | 33 |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [member] | Other financial components [member] | Neutrality [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | 9,408
Sectorial financial assets, noncurrent |  | 9,408
Sectorial financial liabilities, current | 21,419 |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [member] | Other financial components [member] | Overcontracting [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (25,725)
Sectorial financial assets, noncurrent |  | (25,725)
Sectorial financial liabilities, current | (26,995) |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [member] | Other financial components [member] | Hydrological risk [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (113,872)
Sectorial financial assets, noncurrent |  | (113,872)
Sectorial financial liabilities, current | (187,817) |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [member] | Other financial components [member] | Tariff refunds [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial assets, current |  | (24,215)
Sectorial financial assets, noncurrent |  | (24,216)
Sectorial financial liabilities, current | (41,381) |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [member] | Other financial components [member] | Other [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial liabilities, current | 2,612 |
Sectorial financial liabilities, noncurrent |  |
Electricity Rate Adjustment Recoverable 2020 [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
Sectorial financial liabilities, current | 36,395 |
Sectorial financial liabilities, noncurrent |  |
Tariff review 2021 [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial liabilities, current | (188,709) |
Sectorial financial liabilities, noncurrent |  | (96,531)
Tariff review 2021 [member] | Financial components [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial liabilities, current |  |
Sectorial financial liabilities, noncurrent |  | (102,284)
Tariff review 2021 [member] | Financial components [member] | Tariff refunds [member] |  |
DisclosureOfNetSectorialFinancialAssetsAndLiabilitiesLineItems [Line Items] |  |
Sectorial financial liabilities, current |  |
Sectorial financial liabilities, noncurrent |  | R$ (102,284)

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