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18 Intangible assets (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | R$ 6,929,456 | R$ 6,332,611 |
Distribution Concession Agreement [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | 6,203,387 | 5,703,686 |
Generation Concession Agreement [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | 553,840 | 582,671 | R$ 593,852
Gas Distribution [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | 132,366 |  | R$ 3,619
Other [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | R$ 39,863 | R$ 46,254 |

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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 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + Details
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