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31. Expenses by nature (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | $ 10,912,722 | $ 9,247,065 | $ 13,263,857
Selling expenses | 5,032,681 | 3,567,838 | 3,379,261
Administrative expenses | 2,872,127 | 2,504,506 | 2,288,037
Expenses by nature | 18,817,530 | 15,319,409 | 18,931,155
Salaries and social security taxes |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 4,331,442 | 4,997,823 | 5,104,795
Selling expenses | 777,014 | 886,976 | 861,097
Administrative expenses | 914,507 | 917,200 | 987,713
Expenses by nature | 6,022,963 | 6,801,999 | 6,953,605
Pension plans |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 80,695 | 124,507 | 142,590
Selling expenses | 14,476 | 22,097 | 24,053
Administrative expenses | 17,037 | 22,850 | 27,589
Expenses by nature | 112,208 | 169,454 | 194,232
Communications expenses |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 81,110 | 55,281 | 49,817
Selling expenses | 269,674 | 289,371 | 251,381
Administrative expenses | 16,017 | 22,804 | 20,318
Expenses by nature | 366,801 | 367,456 | 321,516
Allowance for the impairment of trade and other receivables |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 0 | 0 | 0
Selling expenses | 977,503 | 391,615 | 433,371
Administrative expenses | 0 | 0 | 0
Expenses by nature | 977,503 | 391,615 | 433,371
Supplies consumption |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 790,392 | 687,199 | 513,318
Selling expenses | 0 | 0 | 0
Administrative expenses | 122,623 | 109,780 | 64,249
Expenses by nature | 913,015 | 796,979 | 577,567
Leases and insurance |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 530 | 653 | 870
Selling expenses | 0 | 0 | 0
Administrative expenses | 180,218 | 182,024 | 173,973
Expenses by nature | 180,748 | 182,677 | 174,843
Security service |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 136,656 | 130,263 | 134,404
Selling expenses | 2,027 | 1,797 | 22,855
Administrative expenses | 128,699 | 141,231 | 85,461
Expenses by nature | 267,382 | 273,291 | 242,720
Fees and remuneration for services |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 1,411,812 | 1,081,974 | 897,754
Selling expenses | 1,040,164 | 876,612 | 923,607
Administrative expenses | 1,007,152 | 820,225 | 771,520
Expenses by nature | 3,459,128 | 2,778,811 | 2,592,881
Public relations and marketing |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 0 | 0 | 0
Selling expenses | 0 | 0 | 0
Administrative expenses | 32,246 | 56,659 | 0
Expenses by nature | 32,246 | 56,659 | 0
Advertising and sponsorship |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 0 | 0 | 0
Selling expenses | 0 | 0 | 0
Administrative expenses | 16,612 | 29,187 | 0
Expenses by nature | 16,612 | 29,187 | 0
Reimbursements to personnel |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 60 | 89 | 1,821
Selling expenses | 68 | 55 | 343
Administrative expenses | 498 | 827 | 1,520
Expenses by nature | 626 | 971 | 3,684
Depreciation of property, plants and |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 2,014,887 | 1,740,231 | 1,739,293
Selling expenses | 300,255 | 275,125 | 301,301
Administrative expenses | 246,357 | 132,733 | 106,647
Expenses by nature | 2,561,499 | 2,148,089 | 2,147,241
Directors and Supervisory Committee |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 0 | 0 | 0
Selling expenses | 0 | 0 | 0
Administrative expenses | 21,893 | 21,429 | 11,937
Expenses by nature | 21,893 | 21,429 | 11,937
ENRE penalties |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 2,064,330 | 428,049 | 4,677,844
Selling expenses | 1,052,135 | 428,663 | 367,907
Administrative expenses | 0 | 0 | 0
Expenses by nature | 3,116,465 | 856,712 | 5,045,751
Taxes and charges |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 0 | 0 | 0
Selling expenses | 598,908 | 395,263 | 193,081
Administrative expenses | 162,549 | 32,011 | 27,088
Expenses by nature | 761,457 | 427,274 | 220,169
Other |  |  |
SummaryOfExpensesByNatureLineItems [Line Items] |  |  |
Transmission and distribution expenses | 808 | 996 | 1,351
Selling expenses | 457 | 264 | 265
Administrative expenses | 5,719 | 15,546 | 10,022
Expenses by nature | $ 6,984 | $ 16,806 | $ 11,638

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