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Intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure of detailed information about intangible assets [abstract] |
Schedule of intangible assets |
| 12.31.2024 | 12.31.2023
Concession agreement – distribution of electricity (16.1) | 9,788,358 |  | 8,317,327 |
Generation concession agreements/ authorization (16.2) | 6,775,081 |  | 2,801,702 |
Others (16.3) | 60,171 |  | 51,060 |
| 16,623,610 |  | 11,170,089 |
Schedule of changes in intangible assets |
| Intangible asset in service | Special liabilities in service | Total
Balance as of January 1, 2023 | 10,033,251 |  | (2,775,424) |  | 7,257,827 |
Transfers from contract assets (Note 10.1) | 1,888,949 |  | (273,071) |  | 1,615,878 |
Other transfers | 3 |  | — |  | 3 |
Amortization quotas - concession (a) | (641,536) |  | 163,877 |  | (477,659) |
Write-offs or disposal | (78,722) |  | — |  | (78,722) |
Balance as of December 31, 2023 | 11,201,945 |  | (2,884,618) |  | 8,317,327 |
Transfers from contract assets (Note 10.1) | 2,303,950 |  | (200,428) |  | 2,103,522 |
Transfers to other receivables | 15 |  | — |  | 15 |
Amortization quotas – concession (a) | (732,351) |  | 175,489 |  | (556,862) |
Write-offs or disposal | (75,644) |  | — |  | (75,644) |
Balance as of December 31, 2024 | 12,697,915 |  | (2,909,557) |  | 9,788,358 |
(a) Amortization during the concession period after the transfer to intangible assets in service of useful life of the assets, whichever the lower.
Schedule of generation concession agreements |
| Concession contract (a) | Concession and authorization rights/goodwill | Total
in service | in progress
Balance as of January 1, 2023 | 1,530,777 |  | — |  | 721,838 |  | 2,252,615 |
Effect of acquisition of control | — |  | — |  | 614,958 |  | 614,958 |
Technical goodw ill arising from the business combination | — |  | — |  | 204,443 |  | 204,443 |
ANEEL grant - use of public property | — |  | 894 |  | — |  | 894 |
Amortization quotas - concession and authorization (a) | (228,513) |  | — |  | (42,695) |  | (271,208) |
Capitalizations for intangible in service | 894 |  | (894) |  | — |  | — |
Balance as of December 31, 2023 | 1,303,158 |  | — |  | 1,498,544 |  | 2,801,702 |
Grant Bonus (Note 1) | 4,073,915 |  | — |  | — |  | 4,073,915 |
ANEEL grant – use of public property (Note 1) | 205,201 |  | — |  | — |  | 205,201 |
Amortization quotas – concession and authorization (a) | (230,680) |  | — |  | (44,383) |  | (275,063) |
(-) Reclassification (b) | (30,674) |  | — |  | — |  | (30,674) |
Balance as of December 31, 2024 | 5,320,920 |  | — |  | 1,454,161 |  | 6,775,081 |
(a) Amortization during the concession/authorization as of the start of commercial operations of the enterprises.
(b) Reclassification to Assets classified as held for sale (Note 37).
Schedule of piped gas distribution service concession |
Schedule of other intangible assets |
| In service | In progress | Total
Balance as of January 1, 2023 | 12,848 |  | 28,330 |  | 41,178 |
Effect of business combination | 4 |  | — |  | 4 |
Acquisitions | 37 |  | 13,351 |  | 13,388 |
Transfers from property, plant and equipment | 4,570 |  | — |  | 4,570 |
Capitalizations for intangible in service | 14,555 |  | (14,555) |  | — |
Amortization quotas (a) | (8,040) |  | — |  | (8,040) |
Write-offs or disposal | — |  | (6) |  | (6) |
(-) Reclassification (b) | (34) |  | — |  | (34) |
Balance as of December 31, 2023 | 23,940 |  | 27,120 |  | 51,060 |
Acquisitions | — |  | 24,371 |  | 24,371 |
Transfers from property, plant and equipment | — |  | (3,339) |  | (3,339) |
Transfers from contract assets | — |  | 52 |  | 52 |
Capitalizations for intangible in service | 10,929 |  | (10,929) |  | — |
Amortization quotas (a) | (8,720) |  | — |  | (8,720) |
Write-offs or disposal | — |  | (539) |  | (539) |
(-) Reclassification (b) | (277) |  | (2,437) |  | (2,714) |
Balance as of December 31, 2024 | 25,872 |  | 34,299 |  | 60,171 |
(a) Annual amortization rate: 20%.
(b) Reclassification to Assets classified as held for sale (Note 37).

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