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17 Property, Plant and Equipment (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total | R$ (1,083,438) |  | R$ (1,201,182)
Impairment at the year | 37,609 |  | 117,744
Transfer |  |  |
Recoverable amount at ending | (1,045,829) |  | (1,083,438)
In Progress [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total | (122,261) |  | (1,197,693)
Impairment at the year | 1,953 |  | (24,689)
Transfer |  |  | 1,100,121
Recoverable amount at ending | (120,308) |  | (122,261)
In Progress [member] | HPP Colider [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total |  |  | (731,265)
Impairment at the year |  |  | (482)
Transfer |  |  | 731,747
Recoverable amount at ending |  |  |
In Progress [member] | Wind Power Complex Cutia [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total |  |  | (167,875)
Impairment at the year |  |  | (373)
Transfer |  |  | 168,248
Recoverable amount at ending |  |  |
In Progress [member] | Wind Power Complex Bento Miguel [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total |  |  | (84,621)
Impairment at the year |  |  | (2,749)
Transfer |  |  | 87,370
Recoverable amount at ending |  |  |
In Progress [member] | Power Plants In Parana [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total | (107,797) |  | (199,468)
Impairment at the year | 1,953 |  | (21,085)
Transfer |  |  | 112,756
Recoverable amount at ending | (105,844) |  | (107,797)
In Progress [member] | Consorcio Tapajos [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total | (14,464) |  | (14,464)
Impairment at the year |  | [1] |
Transfer |  |  |
Recoverable amount at ending | (14,464) |  | (14,464)
In Service [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total | (961,177) |  | 3,489
Impairment at the year | 35,656 |  | 142,433
Transfer |  |  | (1,100,121)
Recoverable amount at ending | (925,521) |  | (961,177)
In Service [member] | UHE Colider [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total | (777,294) |  |
Impairment at the year |  |  | (45,547)
Transfer | 94,101 |  | (731,747)
Recoverable amount at ending | (683,193) |  | (777,294)
In Service [member] | Wind Power Complex Cutia [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total | (54,104) |  |
Impairment at the year | 54,104 |  | 114,144
Transfer |  |  | (168,248)
Recoverable amount at ending |  |  | (54,104)
In Service [member] | UEG Araucaria [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total |  |  |
Impairment at the year | (138,777) |  |
Transfer |  |  |
Recoverable amount at ending | (138,777) |  |
In Service [member] | Wind Power Complex Bento Miguel [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total |  |  |
Impairment at the year |  |  | 87,370
Transfer |  |  | (87,370)
Recoverable amount at ending |  |  |
In Service [member] | Power Plants In Parana [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gross total | (129,779) |  | (3,489)
Impairment at the year | 26,228 |  | (13,534)
Transfer |  |  | (112,756)
Recoverable amount at ending | R$ (103,551) |  | R$ (129,779)
[1] | Project under development

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