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31 Net Operating Revenue (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | R$ 1,857,343 | R$ 2,161,811 | R$ 2,457,562
Energy development account CDE energia [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | 1,530,998 | 1,654,157 | 1,840,283
Other charges - rate flags [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | 81,159 | 280,286 | 423,098
Research and development and energy efficiency - R&D and EEP [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | 144,474 | 127,432 | 123,306
Global reversion reserve - RGR quota [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | 62,057 | 63,918 | 48,512
Energy development account - "CDE uso" [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | 27,315 | 25,271 | 12,211
Inspection fee [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Regulatory charges | R$ 11,340 | R$ 10,747 | R$ 10,152

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