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28. Other Accounts Payable (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable R$ 309,024 R$ 194,254
Other accounts payable, current 192,070 121,405
Other accounts payable, noncurrent 116,954 72,849
Customers    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 70,713 33,380
Obligations to customers in gas sales operations    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 55,048 33,221
Investment acquisition    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 32,200 12,307
Public lighting rate collected    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 28,337 24,101
Aneel Order No. 084/2017 provision    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 24,314 22,132
Financial offset for the use of water resources    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 20,820 21,467
Fair value in the purchase and sale of power in the active market    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 11,007 0
Pledges in guarantee    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 10,026 8,837
Reimbursements to customer contributions    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable 5,036 5,481
Other liabilities    
DisclosureOfOtherAccountsPayableLineItems [Line Items]    
Other accounts payable R$ 51,523 R$ 33,328