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9. Property, plant and equipment (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]      
Cost $ 85,289,885 $ 77,638,404 $ 69,674,835
Accumlated depreciation (22,815,042) (20,578,217) (18,780,067)
Property, plant, and equipment, beginning 57,060,187 50,894,768  
Additions 8,549,909 8,482,798  
Disposals (573,754) (49,824)  
Transfers 0 (119,466)  
Depreciation for the period (2,561,499) (2,148,089) (2,147,241)
Property, plant, and equipment, ending 62,474,843 57,060,187 50,894,768
Lands and buildings      
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]      
Cost 1,449,399 1,376,244 1,276,109
Accumlated depreciation (243,782) (205,458) (178,241)
Property, plant, and equipment, beginning 1,170,786 1,097,868  
Additions 18,746 122,804  
Disposals (36) (765)  
Transfers 89,250 50,983  
Depreciation for the period (73,129) (100,104)  
Property, plant, and equipment, ending 1,205,617 1,170,786 1,097,868
Substations      
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]      
Cost 13,769,111 13,471,386 12,466,805
Accumlated depreciation (3,973,902) (3,571,659) (3,214,869)
Property, plant, and equipment, beginning 9,899,727 9,251,936  
Additions 113,838 680,868  
Disposals (2,211) (7)  
Transfers 187,522 323,723  
Depreciation for the period (403,667) (356,793)  
Property, plant, and equipment, ending 9,795,209 9,899,727 9,251,936
Voltage lines      
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]      
Cost 38,060,451 36,429,475 33,712,884
Accumlated depreciation (12,171,436) (11,249,849) (10,386,483)
Property, plant, and equipment, beginning 25,179,626 23,326,401  
Additions 380,528 1,456,818  
Disposals (94,785) (35,030)  
Transfers 1,595,057 1,357,461  
Depreciation for the period (1,171,411) (926,024)  
Property, plant, and equipment, ending 25,889,015 25,179,626 23,326,401
Meters and Transformer chambers and platforms      
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]      
Cost 15,749,070 15,047,060 13,924,981
Accumlated depreciation (5,160,874) (4,638,799) (4,157,929)
Property, plant, and equipment, beginning 10,408,261 9,767,052  
Additions 51,465 467,268  
Disposals (35,870) (9,618)  
Transfers 710,388 664,134  
Depreciation for the period (546,048) (480,575)  
Property, plant, and equipment, ending 10,588,196 10,408,261 9,767,052
Tools, Furniture, vehicles, equipment, communications and advances to suppliers      
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]      
Cost 2,656,570 2,506,343 2,398,833
Accumlated depreciation (1,265,048) (912,452) (842,545)
Property, plant, and equipment, beginning 1,593,891 1,556,288  
Additions 516,244 566,753  
Disposals (440,852) (4,404)  
Transfers 89,483 (240,153)  
Depreciation for the period (367,244) (284,593)  
Property, plant, and equipment, ending 1,391,522 1,593,891 1,556,288
Construction in process      
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]      
Cost 13,409,979 8,717,184 5,839,187
Accumlated depreciation 0 0 0
Property, plant, and equipment, beginning 8,717,184 5,839,187  
Additions 7,339,357 5,103,253  
Disposals 0 0  
Transfers (2,646,562) (2,225,256)  
Depreciation for the period 0 0  
Property, plant, and equipment, ending 13,409,979 8,717,184 5,839,187
Supplies and spare parts      
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]      
Cost 195,305 90,712 56,036
Accumlated depreciation 0 0 0
Property, plant, and equipment, beginning 90,712 56,036  
Additions 129,731 85,034  
Disposals 0 0  
Transfers (25,138) (50,358)  
Depreciation for the period 0 0  
Property, plant, and equipment, ending $ 195,305 $ 90,712 $ 56,036