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INVESTMENTS IN ASSOCIATES (Details) - ARS ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [1] | Dec. 31, 2017 | [1]
Investments in associates [Abstract] |  |  |  |
Book value | $ 128,395 | $ 107,088 |  |
Common stock | 37,040,489 | 38,595,667 |  |
Shareholders' equity | $ 66,026,644 | 65,461,118 | $ 64,808,237 | $ 52,942,623
Transporte y Servicios de Gas en Uruguay S.A. [Member] |  |  |  |
Investments in associates [Abstract] |  |  |  |
Face value (in pesos per share) | $ 1 |  |  |
Amount | $ 196,000 |  |  |
Cost | 248 |  |  |
Book value | $ 8,540 | 9,022 |  |
Main business | Pipeline maintenance |  |  |
Date | 9/30/2020 |  |  |
Common stock | $ 28 |  |  |
Net (loss) / income for the year / period | (868) |  |  |
Shareholders' equity | $ 17,428 |  |  |
% 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 | 2,757 |  |  |
Book value | $ 490 | 569 |  |
Main business | Pipeline construction and operation services |  |  |
Date | 9/30/2020 |  |  |
Common stock | $ 237 |  |  |
Net (loss) / income for the year / period | (131) |  |  |
Shareholders' equity | $ 1,000 |  |  |
% of Common Stock | 49.00% |  |  |
Gas Link S.A. [Member] |  |  |  |
Investments in associates [Abstract] |  |  |  |
Face value (in pesos per share) | $ 1 |  |  |
Amount | $ 502,962 |  |  |
Cost | 11,701 |  |  |
Book value | $ 119,365 | $ 97,497 |  |
Main business | Pipeline construction and operation services |  |  |
Date | 9/30/2020 |  |  |
Common stock | $ 1,026 |  |  |
Net (loss) / income for the year / period | 27,254 |  |  |
Shareholders' equity | $ 622,779 |  |  |
% 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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