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12. Trade receivables (Details) - ARS ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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SummaryOfTradeReceivablesLineItems [Line Items] |  |
Current trade receivables | $ 7,587,906 | $ 8,385,237
Sales of electricity - Billed |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |
Current trade receivables | 4,622,701 | 4,359,990
Sales of electricity - Unbilled |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |
Current trade receivables | 3,735,956 | 4,404,135
Framework Agreement |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |
Current trade receivables | 10,377 | 230,953
Fee payable for the expansion of the transportation and others |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |
Current trade receivables | 22,969 | 33,952
Receivables in litigation |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |
Current trade receivables | 97,158 | 33,736
Allowance for the impairment of trade receivables |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |
Current trade receivables | $ (901,255) | $ (677,529)

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