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10. Accounts Receivable Concessions (Details 6) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable Concessions Details 6Abstract    
Power generation concession contract R$ 68,859 R$ 67,401
Gain on remeasurement of the cash flow 1,247 341
Reversal of impairment (note 32.4) 4,758 1,117
Transfers to other current receivables - disposal of assets (9,053)  
Power generation concession contract R$ 65,811 R$ 68,859