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22. Trade payables (Details) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
SummaryOfTradePayablesLineItems [Line Items]    
Noncurrent $ 369,552 $ 440,116
Current 12,700,807 22,464,224
Customer guarantees    
SummaryOfTradePayablesLineItems [Line Items]    
Noncurrent 213,097 216,768
Customer contributions    
SummaryOfTradePayablesLineItems [Line Items]    
Noncurrent 156,455 172,720
Current 30,858 23,508
Funding contributions - substations    
SummaryOfTradePayablesLineItems [Line Items]    
Noncurrent 0 50,628
Current 0 26,471
Payables for purchase of electricity - CAMMESA    
SummaryOfTradePayablesLineItems [Line Items]    
Current 4,367,129 8,727,732
Provision for unbilled electricity purchases - CAMMESA    
SummaryOfTradePayablesLineItems [Line Items]    
Current 4,938,327 9,584,381
Suppliers    
SummaryOfTradePayablesLineItems [Line Items]    
Current 3,042,079 3,730,485
Advance to customer    
SummaryOfTradePayablesLineItems [Line Items]    
Current 285,042 302,135
Discounts to customers    
SummaryOfTradePayablesLineItems [Line Items]    
Current 37,372 57,467
Related parties    
SummaryOfTradePayablesLineItems [Line Items]    
Current $ 0 $ 12,045