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4 Significant Accounting Policies (Details Narrative) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 BRL (R$) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2017 BRL (R$)
Significant Accounting Policies [Abstract] |  |  |
CDI rate | 0.0910 |  |
Increase in assets and liabilities | R$ 118,022 |  |
Increase in amortization | 34,205 |  |
Increase in interest expense | 9,675 |  |
Other operational income (expenses) | R$ (458,815) | R$ (302,690) | R$ (464,316)
Percentage of construction margin adopted for the transmission activity | 1.65% | 1.65% | 1.65%

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