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13. Trade receivables (Details) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
SummaryOfTradeReceivablesLineItems [Line Items]    
Current trade receivables $ 12,460,070 $ 11,667,923
Sales of electricity - Billed    
SummaryOfTradeReceivablesLineItems [Line Items]    
Current trade receivables 7,714,038 7,108,327
Sales of electricity - Unbilled    
SummaryOfTradeReceivablesLineItems [Line Items]    
Current trade receivables 5,792,028 5,744,779
PBA & CABA government credit    
SummaryOfTradeReceivablesLineItems [Line Items]    
Current trade receivables 251,361 0
Framework agreement    
SummaryOfTradeReceivablesLineItems [Line Items]    
Current trade receivables 9,003 15,957
Fee payable for the expansion of the transportation and others    
SummaryOfTradeReceivablesLineItems [Line Items]    
Current trade receivables 25,046 35,321
Receivables in litigation    
SummaryOfTradeReceivablesLineItems [Line Items]    
Current trade receivables 214,884 149,400
Allowance for the impairment of trade receivables    
SummaryOfTradeReceivablesLineItems [Line Items]    
Current trade receivables $ (1,546,290) $ (1,385,861)