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17 Property, Plant and Equipment (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of joint operations [line items] |  |  |
Joint operations | R$ 1,349,434 | R$ 1,393,501 |
HPP Maua (Consorcio Energetico Cruzeiro do Sul) [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Share | 51.00% |  |
Joint operations | R$ 649,290 | 670,706 |
HPP Baixo Iguacu [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Share | 30.00% |  |
Joint operations | R$ 700,144 | 722,795 |
In Service [member] | Accumulated Depreciation [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Annual average depreciation rate | 3.43% |  |
Joint operations | R$ (235,454) | (206,000) |
In Service [member] | HPP Maua (Consorcio Energetico Cruzeiro do Sul) [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Joint operations | 859,917 | 859,917 |
In Service [member] | HPP Baixo Iguacu [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Joint operations | R$ 691,833 |  | R$ 692,593
In Progress [member] | Accumulated Depreciation [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Annual average depreciation rate | 3.29% |  |
Joint operations | R$ (41,803) | (19,038) |
In Progress [member] | HPP Maua (Consorcio Energetico Cruzeiro do Sul) [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Joint operations | 24,827 | 16,789 |
In Progress [member] | HPP Baixo Iguacu [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Joint operations | R$ 50,114 | R$ 49,240 |

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