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31 Net Operating Revenue (Details 4) - 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$ 1,857,343 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