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31 Net Operating Revenue (Details 5) - National electric energy agency [member] - Energy development account CDE energia [member] - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | R$ 1,530,998 | R$ 1,654,157 | R$ 1,840,283
CDE USO [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | R$ 1,530,998 | R$ 1,266,152 | R$ 1,040,045
CDE USO [member] | Resolution no. 2,510/2018 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  | Resolution No. 2,510/2018 |
Period |  | January to June |
Regulatory charges |  | R$ 1,269,498 |
CDE USO [member] | Preliminary injunctions [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions | (-) Preliminary injunctions | (-) Preliminary injunctions | (-) Preliminary injunctions
Period | January to December | January to June | January to December
Regulatory charges | R$ (715) | R$ (3,346) | R$ (2)
CDE USO [member] | Resolution No. 2,368/2018 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  |  | Resolution No. 2,368/2018
Period |  |  | January to August
Regulatory charges |  |  | R$ 594,972
CDE USO [member] | Resolution No. 2,446/2018 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  |  | Resolution No. 2,446/2018
Period |  |  | September to December
Regulatory charges |  |  | R$ 445,075
CDE USO [member] | Resolution no. 2,664/2019 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions | Resolution No. 2,664/2019 |  |
Period | January to December |  |
Regulatory charges | R$ 1,531,713 |  |
CONTA ACR [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges |  | R$ 348,177 | R$ 557,981
CONTA ACR [member] | Resolution mo. 2,231/2017 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  | Resolution No. 2,231/2017 | Resolution No. 2,231/2017
Period |  | January to February | January to December
Regulatory charges |  | R$ 98,725 | R$ 557,981
CONTA ACR [member] | Resolution no. 2,521/2019 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  | Resolution No. 2,521/2019 |
Period |  | March to August |
Regulatory charges |  | R$ 296,174 |
CONTA ACR [member] | Return - order no. 2,755 / 2019 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  | Return - Order No. 2,755 / 2019 |
Regulatory charges |  | R$ (46,722) |
CDE ENERGIA [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges |  | R$ 39,828 | R$ 242,257
CDE ENERGIA [member] | Resolution no. 2,510/2018 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  | Resolution No. 2,510/2018 |
Period |  | January to March |
Regulatory charges |  | R$ 41,431 |
CDE ENERGIA [member] | Preliminary injunctions [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  | (-) Preliminary injunctions | (-) Preliminary injunctions
Period |  | January to March | January to December
Regulatory charges |  | R$ (1,603) | R$ (3,442)
CDE ENERGIA [member] | Resolution No. 2,202/2017 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  |  | Resolution No. 2,202/2017
Period |  |  | January to May
Regulatory charges |  |  | R$ 100,692
CDE ENERGIA [member] | Resolution No. 2,358/2017 [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Resolutions |  |  | Resolution No. 2,358/2017
Period |  |  | June to December
Regulatory charges |  |  | R$ 145,007

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