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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)