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Schedule of Compositions of net sectorial financial assets and liabilities balances per tariff cycle (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | R$ 383,740 | R$ 173,465 | R$ 355,570
Sectorial financial assets, noncurrent | 383,740 | 173,465 | 118,419
Sectorial financial liabilities, current | (139,770) | (188,709) |
Sectorial financial liabilities, Non current | 153,409 |  | R$ (102,284)
Sectorial financial assets, current | (139,770) | (188,709) |
Sectorial financial assets, noncurrent | (153,409) |  |
Electricity Rate Adjustment Recoverable 2021 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 173,465 |
Sectorial financial assets, noncurrent |  | 173,465 |
Electricity Rate Adjustment Recoverable 2021 [Member] | Portion A | C V A Energ [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (54,864) |
Sectorial financial assets, noncurrent |  | (54,864) |
Electricity Rate Adjustment Recoverable 2021 [Member] | Portion A | Electricity purchased for resale - Itaipu |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 231,588 |
Sectorial financial assets, noncurrent |  | 231,588 |
Electricity Rate Adjustment Recoverable 2021 [Member] | Portion A | Charges For Using The Transmission System Basic Grid [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 88,137 |
Sectorial financial assets, noncurrent |  | 88,137 |
Electricity Rate Adjustment Recoverable 2021 [Member] | Portion A | Transport Of Energy Purchased From Itaipu [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 9,766 |
Sectorial financial assets, noncurrent |  | 9,766 |
Electricity Rate Adjustment Recoverable 2021 [Member] | Portion A | E S S [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 11,266 |
Sectorial financial assets, noncurrent |  | 11,266 |
Electricity Rate Adjustment Recoverable 2021 [Member] | Portion A | C D E [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (903) |
Sectorial financial assets, noncurrent |  | (903) |
Electricity Rate Adjustment Recoverable 2021 [Member] | Portion A | Proinfa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (89) |
Sectorial financial assets, noncurrent |  | (89) |
Electricity Rate Adjustment Recoverable 2021 [Member] | Other financial components | Neutrality |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 27,923 |
Sectorial financial assets, noncurrent |  | 27,923 |
Electricity Rate Adjustment Recoverable 2021 [Member] | Other financial components | Overcontracting |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 78,836 |
Sectorial financial assets, noncurrent |  | 78,836 |
Electricity Rate Adjustment Recoverable 2021 [Member] | Other financial components | Hydrological risk |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (143,147) |
Sectorial financial assets, noncurrent |  | (143,147) |
Electricity Rate Adjustment Recoverable 2021 [Member] | Other financial components | Tariff refunds |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | (76,144) |
Sectorial financial assets, noncurrent |  | (76,144) |
Electricity Rate Adjustment Recoverable 2021 [Member] | Other financial components | Other [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current |  | 1,096 |
Sectorial financial assets, noncurrent |  | 1,096 |
Electricity Rate Adjustment Recoverable 2022 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | 383,740 |  |
Sectorial financial assets, noncurrent | 383,740 |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Portion A | C V A Energ [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | (175,646) |  |
Sectorial financial assets, noncurrent | (175,646) |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Portion A | Electricity purchased for resale - Itaipu |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | 486,312 |  |
Sectorial financial assets, noncurrent | 486,312 |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Portion A | Charges For Using The Transmission System Basic Grid [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | 13,211 |  |
Sectorial financial assets, noncurrent | 13,211 |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Portion A | Transport Of Energy Purchased From Itaipu [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | (929) |  |
Sectorial financial assets, noncurrent | (929) |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Portion A | E S S [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | 253,471 |  |
Sectorial financial assets, noncurrent | 253,471 |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Portion A | C D E [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | (28,186) |  |
Sectorial financial assets, noncurrent | (28,186) |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Portion A | Proinfa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, noncurrent | (99) |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Other financial components | Neutrality |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | 23,702 |  |
Sectorial financial assets, noncurrent | 23,702 |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Other financial components | Overcontracting |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | (62,531) |  |
Sectorial financial assets, noncurrent | (62,531) |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Other financial components | Hydrological risk |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | (183,739) |  |
Sectorial financial assets, noncurrent | (183,739) |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Other financial components | Tariff refunds |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | (39,014) |  |
Sectorial financial assets, noncurrent | (39,014) |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Other financial components | Other [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | 66,635 |  |
Sectorial financial assets, noncurrent | 66,636 |  |
Electricity Rate Adjustment Recoverable 2022 [Member] | Other financial components | Itaipu Bonus [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | 30,553 |  |
Sectorial financial assets, noncurrent | 30,552 |  |
Electricity Rate Adjustment Recoverable 2022 Member Electricity Rate Adjustment Recoverable 2022 [Member] | Portion A | Proinfa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial assets, current | (99) |  |
Electricity Rate Adjustment Recoverable 2020 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | (188,709) |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Portion A | C V A Energ [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | 9,675 |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Portion A | Charges For Using The Transmission System Basic Grid [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | 603 |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Portion A | Transport Of Energy Purchased From Itaipu [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | 214 |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Portion A | E S S [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | (3,401) |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Portion A | C D E [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | (66) |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Portion A | Proinfa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | 33 |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Other financial components | Neutrality |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | 21,419 |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Other financial components | Overcontracting |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | (26,995) |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Other financial components | Hydrological risk |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | (187,817) |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Other financial components | Tariff refunds |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | (41,381) |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Other financial components | Other [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | 2,612 |
Sectorial financial liabilities, Non current |  |  |
Electricity Rate Adjustment Recoverable 2020 [Member] | Other financial components | Offset Of Energy Surplus Deficit Under C C E A R Bilateral Contracts [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current |  | R$ 36,395 |
Sectorial financial liabilities, Non current |  |  |
Tariff Review 2021 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | (139,770) |  |
Tariff Review 2021 [Member] | Portion A | C V A Energ [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | (124,550) |  |
Tariff Review 2021 [Member] | Portion A | Electricity purchased for resale - Itaipu |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | 314,342 |  |
Tariff Review 2021 [Member] | Portion A | Charges For Using The Transmission System Basic Grid [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | 154,099 |  |
Tariff Review 2021 [Member] | Portion A | Transport Of Energy Purchased From Itaipu [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | 15,876 |  |
Tariff Review 2021 [Member] | Portion A | E S S [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | 24,338 |  |
Tariff Review 2021 [Member] | Portion A | C D E [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | 37,586 |  |
Tariff Review 2021 [Member] | Portion A | Proinfa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | 10,699 |  |
Tariff Review 2021 [Member] | Other financial components | Neutrality |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | 33,773 |  |
Tariff Review 2021 [Member] | Other financial components | Overcontracting |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | 46,466 |  |
Tariff Review 2021 [Member] | Other financial components | Hydrological risk |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | (236,674) |  |
Tariff Review 2021 [Member] | Other financial components | Tariff refunds |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | (55,116) |  |
Tariff Review 2021 [Member] | Other financial components | Other [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | (23,075) |  |
Tariff Review 2021 [Member] | Other financial components | Offset Of Energy Surplus Deficit Under C C E A R Bilateral Contracts [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | (184) |  |
Tariff Review 2021 [Member] | Other financial components | Refund Pis And Cofins Credits [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | (337,350) |  |
Tariff Review 2023 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, Non current | (109,507) |  |
Tariff Review 2023 [Member] | Other financial components | Overcontracting |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, Non current | (21,951) |  |
Tariff Review 2023 [Member] | Other financial components | Other [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, Non current | (87,556) |  |
Tariff Review 2024 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, Non current | (21,951) |  |
Tariff Review 2024 [Member] | Tariff refunds | Overcontracting |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, Non current | (21,951) |  |
Tariff Review 2025 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, current | (21,951) |  |
Tariff Review 2025 [Member] | Tariff refunds | Overcontracting |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Sectorial financial liabilities, Non current | R$ (21,951) |  |

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