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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