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Intangible assets (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |
Intangible assets, beginning | R$ 10,277,727 |
Intangible assets, ending | 11,170,089 | R$ 10,277,727
Generation Concession Agreement In Service [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Intangible assets, beginning | 1,530,777 | 1,759,286
Amortization of quotas - concession and authorization | (228,513) | (228,509)
Capitalizations for intangible in service | 894 |
Intangible assets, ending | 1,303,158 | 1,530,777
Generation Concession Agreement In Progress [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Intangible assets, beginning |  |
ANEEL grant - use of public property | 894 |
Capitalizations for intangible in service | (894) |
Intangible assets, ending |  |
Generation Concession Agreement Concession Authoriztion Rights [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Intangible assets, beginning | 721,838 | 714,572
Effect of acquisition of control | 614,958 | 23,982
Technical goodwill arising from the business combination | 204,443 | 8,154
Amortization of quotas - concession and authorization | (42,695) | (24,870)
Intangible assets, ending | 1,498,544 | 721,838
Generation Concession Agreement [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Intangible assets, beginning | 2,252,615 | 2,473,858
Effect of acquisition of control | 614,958 | 23,982
Technical goodwill arising from the business combination | 204,443 | 8,154
Amortization of quotas - concession and authorization | (271,208) | (253,379)
ANEEL grant - use of public property | 894 |
Intangible assets, ending | R$ 2,801,702 | R$ 2,252,615

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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2023-01-01 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_118_e&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_c&doctype=Standard -URIDate 2023-03-23 + Details
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