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18 Trade receivables (Details) - ARS ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Summary of trade receivables [line items] |  |  |
Current trade receivables |  | $ 14,151 | $ 16,961
Sales of electricity - billed [member] |  |  |
Summary of trade receivables [line items] |  |  |
Current trade receivables |  | 12,304 | 10,501
Framework agreement [member] |  |  |
Summary of trade receivables [line items] |  |  |
Current trade receivables | [1] | 9 | 12
Receivables in litigation [member] |  |  |
Summary of trade receivables [line items] |  |  |
Current trade receivables |  | 300 | 293
Allowance for the impairment of trade receivables [member] |  |  |
Summary of trade receivables [line items] |  |  |
Current trade receivables |  | (4,605) | (2,105)
Subtotal [member] |  |  |
Summary of trade receivables [line items] |  |  |
Current trade receivables |  | 8,008 | 8,701
Sales of electricity - unbilled [member] |  |  |
Summary of trade receivables [line items] |  |  |
Current trade receivables |  | 5,812 | 7,884
PBA & CABA government credit [member] |  |  |
Summary of trade receivables [line items] |  |  |
Current trade receivables |  | 329 | 342
Fee payable for the expansion of the transportation and others [member] |  |  |
Summary of trade receivables [line items] |  |  |
Current trade receivables |  | $ 2 | $ 34
[1] | As of December 31, 2020, the Province of Buenos Aires and the Federal Government have a debt with the Company for the consumption of electricity by low-income areas and shantytowns. The indicated amount does not include interest and no revenue for this concept has been recognized by the Company. See Note 2.f).

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