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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | R$ 6,105,274 | R$ 6,361,178 | R$ 6,165,450
Purchase of Energy In The Regulated Environment - CCEAR [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 2,880,115 | 2,599,345 | 2,693,976
Electric Energy Trade Chamber - CCEE [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 1,405,497 | 1,850,021 | 1,766,091
Itaipu Binacional [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 1,316,524 | 1,272,177 | 1,117,957
Bilateral Contracts [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 754,070 | 928,741 | 766,803
Program For Incentive To Alternative Energy Sources - Proinfa [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 268,063 | 228,295 | 217,646
Micro and Mini Generators and Repurchase Of Customers [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | 52,871 | 12,373 | 3,892
PIS/Pasep/Cofins Taxes On Electricity Purchased For Resale [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Electricity purchased for resale | R$ (571,866) | R$ (529,774) | R$ (400,915)

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