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12. Other Receivables (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables R$ 592,145 R$ 558,767
Other current receivables 363,250 409,351
Other noncurrent receivables 228,894 149,416
Services in progress    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 165,973 141,959
Credits on sales and purchases of gas    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 112,003 77,279
CDE Transfer    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 107,472 136,559
Tariff flag    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 28,725 14,536
Advance payments to suppliers    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 22,096 29,016
Advance payments to employees    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 21,201 25,928
Advance for severance estate    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 19,591 19,230
Decommissioning in progress    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 19,457 53,348
Fair value in the purchase and sale of power in the active market    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables 14,793 0
Other receivables    
DisclosureOfOtherReceivablesLineItems [Line Items]    
Other receivables R$ 80,834 R$ 60,912