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INVESTMENTS IN ASSOCIATES (Details) - ARS ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | [1] | Dec. 31, 2016 | [1]
Investments in associates [Abstract] |  |  |  |
Book value | $ 78,660 | $ 111,790 |  |
Common stock | 28,349,861 | 28,224,365 |  |
Shareholders' equity | $ 48,083,469 | 47,603,906 | $ 38,888,199 | $ 30,041,011
Transporte y Servicios de Gas en Uruguay S.A. |  |  |  |
Investments in associates [Abstract] |  |  |  |
Face value (in pesos per share) | $ 1 |  |  |
Amount | $ 196,000 |  |  |
Cost | 182 |  |  |
Book value | $ 6,627 | 8,919 |  |
Main business | Pipeline maintenance |  |  |
Date | 9/30/2019 |  |  |
Common stock | $ 28 |  |  |
Net (loss) / income for the year / period | (783) |  |  |
Shareholders' equity | $ 14,308 |  |  |
% of Common Stock | 49.00% |  |  |
Emprendimientos de Gas del Sur S.A. [Member] |  |  |  |
Investments in associates [Abstract] |  |  |  |
Face value (in pesos per share) | $ 1 |  |  |
Amount | $ 116,130 |  |  |
Cost | 2,025 |  |  |
Book value | $ 418 | 498 |  |
Main business | Pipeline construction and operation services |  |  |
Date | 9/30/2019 |  |  |
Common stock | $ 237 |  |  |
Net (loss) / income for the year / period | (186) |  |  |
Shareholders' equity | $ 854 |  |  |
% of Common Stock | 49.00% |  |  |
Gas Link S.A. |  |  |  |
Investments in associates [Abstract] |  |  |  |
Face value (in pesos per share) | $ 1 |  |  |
Amount | $ 502,962 |  |  |
Cost | 8,595 |  |  |
Book value | $ 71,615 | $ 102,373 |  |
Main business | Pipeline construction and operation services |  |  |
Date | 9/30/2019 |  |  |
Common stock | $ 1,026 |  |  |
Net (loss) / income for the year / period | 6,990 |  |  |
Shareholders' equity | $ 396,461 |  |  |
% of Common Stock | 49.00% |  |  |
[1] | The Company has applied IFRS 15 and IFRS 9 for the first time on January 1, 2018. In accordance with the transition methods chosen, the comparative information has not been modified. See Note 4.a)

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