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32 Operating Costs and Expenses (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | R$ 6,829,530 | R$ 6,105,274 | R$ 6,361,178
Purchase of energy in the regulated environment - CCEAR [member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 3,107,956 | 2,880,115 | 2,599,345
Itaipu binacional [member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 1,766,058 | 1,316,524 | 1,850,021
Electric energy trade chamber - CCEE [member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 1,176,798 | 1,405,497 | 1,272,177
Bilateral contracts [member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 1,087,439 | 754,070 | 928,741
Program for incentive to alternative energy sources - Proinfa [member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 221,406 | 268,063 | 228,295
Micro and mini generators and repurchase of customers [member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 161,324 | 52,871 | 12,373
PIS/pasep/cofins taxes on electricity purchased for resale [member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | R$ (691,451) | R$ (571,866) | R$ (529,774)

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