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Schedule of impairment balances (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |  |
Property, Plant and Equipment, Depreciation |  | R$ (601,471) | R$ (682,044)
Property, Plant and Equipment, Impairment |  | 147,938 | 37,609
Projects |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Property, Plant and Equipment, Cost |  | 3,528,836 |
Property, Plant and Equipment, Depreciation |  | (368,589) |
Property, Plant and Equipment, Impairment |  | (897,891) |
Property, Plant and Equipment, Value in use |  | 2,262,356 | 3,528,836
Projects | HPP Col&amp;amp;amp;amp;amp;amp;amp;#63;der |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Property, Plant and Equipment, Cost |  | 2,489,116 |
Property, Plant and Equipment, Depreciation |  | (259,065) |
Property, Plant and Equipment, Impairment |  | (639,529) |
Property, Plant and Equipment, Value in use |  | 1,590,522 | 2,489,116
Projects | Cons&amp;amp;amp;amp;amp;amp;amp;#63;rcio Tapaj&amp;amp;amp;amp;amp;amp;amp;#63;s |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Property, Plant and Equipment, Cost | [1] | 14,879 |
Property, Plant and Equipment, Depreciation | [1] |  |
Property, Plant and Equipment, Impairment | [1] | (14,879) |
Property, Plant and Equipment, Value in use | [1] |  | 14,879
In progress | Cons&amp;amp;amp;amp;amp;amp;amp;#63;rcio Tapaj&amp;amp;amp;amp;amp;amp;amp;#63;s |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Property, Plant and Equipment, Impairment |  | (415) |
In progress | Power Plants In Parana [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Property, Plant and Equipment, Cost |  | 1,024,841 |
Property, Plant and Equipment, Depreciation |  | (109,524) |
Property, Plant and Equipment, Impairment |  | (243,483) | 1,953
Property, Plant and Equipment, Value in use |  | R$ 671,834 | R$ 1,024,841
[1] | The variation in provisions for legal claims occurred due to the review of the assessment of the Company’s legal advisors, mainly in civil claims. The details of the actions are shown in Note 30.

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