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17 Property, Plant and Equipment (Details 3) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Depreciation |  | R$ (682,044) |  | R$ (665,182)
Property, Plant and Equipment, Impairment |  | (37,609) |  | (117,744)
Projects [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Cost |  | 4,178,397 |  |
Property, Plant and Equipment, Depreciation |  | (695,049) |  |
Property, Plant and Equipment, Impairment |  | (1,045,829) |  |
Property, Plant and Equipment, Value in use |  | 2,437,519 |  | 4,178,397
Projects [member] | HPP Colider [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Cost |  | 2,477,374 |  |
Property, Plant and Equipment, Depreciation |  | (167,432) |  |
Property, Plant and Equipment, Impairment |  | (683,193) |  |
Property, Plant and Equipment, Value in use |  | 1,626,749 |  | 2,477,374
Projects [member] | UEG Araucaria [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Cost |  | 701,736 |  |
Property, Plant and Equipment, Depreciation |  | (441,827) |  |
Property, Plant and Equipment, Impairment |  | (138,777) |  |
Property, Plant and Equipment, Value in use |  | 121,132 |  | 701,736
Projects [member] | Power Plants In Parana [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Cost |  | 984,823 |  |
Property, Plant and Equipment, Depreciation |  | (85,790) |  |
Property, Plant and Equipment, Impairment |  | (209,395) |  |
Property, Plant and Equipment, Value in use |  | 689,638 |  | 984,823
In Progress [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Depreciation |  |  |  |
Property, Plant and Equipment, Impairment |  | (1,953) |  | 24,689
In Progress [member] | HPP Colider [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Impairment |  |  |  | 482
In Progress [member] | Consorcio Tapajos [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Cost | [1] | 14,464 |  |
Property, Plant and Equipment, Depreciation | [1] |  |  |
Property, Plant and Equipment, Impairment |  |  | [1] |
Property, Plant and Equipment, Value in use | [1] | (14,464) |  | 14,464
In Progress [member] | Power Plants In Parana [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, Plant and Equipment, Impairment |  | R$ (1,953) |  | R$ 21,085
[1] | Project under development

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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_75_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of property, plant and equipment, for which fair value was used as their deemed cost in the opening IFRS statement of financial position. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 30 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_30&doctype=Standard -URIDate 2020-01-01 + Details
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