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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2020
PROPERTY, PLANT AND EQUIPMENT [Abstract]  
Property, Plant and Equipment
  
2020
 
                                     
  
Cost
  
Depreciation
       
                                     
                                     
              
End of the
  
Accumulated at
the beginning
           
Accumulated at
the end
     
Net
 
  
Beginning
 
Account
 
of the year
  
Additions
  
Retirements
  
Transfers
  
year
  
of the year
  
Retirements
  
For the year
  
rate %
  
of the year
  
Impairment
  
book value
 
                                     
                                     
Pipelines
  
86,231,036
   
-
   
(35,101
)
  
3,444,963
   
89,640,898
   
42,534,145
   
(19,248
)
  
2,199,034
   
2.2
   
44,713,931
   
2,366,584
   
42,560,383
 
                                                 
Compressor plants
  
35,019,137
   
7,198
   
-
   
3,234,851
   
38,261,186
   
23,443,580
   
-
   
1,612,640
  

3.3 to 25
   
25,056,220
   
710,834
   
12,494,132
 
                                                 
Other plants
  
36,061
   
-
   
-
   
-
   
36,061
   
12,169
   
-
   
1,223
   
3.3
   
13,392
   
1,139
   
21,530
 
                                                 
Stations of regulation and/or
measurement of pressure
  
2,952,477
   
-
   
(973
)
  
86,690
   
3,038,194
   
2,349,855
   
(852
)
  
81,942
   
4.0
   
2,430,945
   
31,711
   
575,538
 
                                                 
Other technical installations
  
573,367
   
-
   
-
   
5,324
   
578,691
   
493,239
   
-
   
12,844
   
6.7
   
506,083
   
3,788
   
68,820
 
                                                 
Subtotal assets related to
natural gas transportation service
  
124,812,078
   
7,198
   
(36,074
)
  
6,771,828
   
131,555,030
   
68,832,988
   
(20,100
)
  
3,907,683
       
72,720,571
   
3,114,056
   
55,720,403
 
                                                 
Non-regulated segment Pipelines
  
13,933,750
   
239
   
-
   
821,049
   
14,755,038
   
171,999
   
-
   
488,543
   
2.2
   
660,542
   
-
   
14,094,496
 
                                                 
Non-regulated segment Compressor plants
  
2,799,504
   
-
   
-
   
44,333
   
2,843,837
   
1,089,298
   
-
   
302,829
  

3.3 to 25
   
1,392,127
   
-
   
1,451,710
 
                                                 
Non-regulated segment Other plants
  
24,577,179
   
-
   
(673
)
  
1,200,338
   
25,776,844
   
14,007,475
   
(5
)
  
623,057
   
3.3
   
14,630,527
   
-
   
11,146,317
 
                                                 
Non-regulated segment Stations of regulation and/or
measurement of pressure
  
857,407
   
1,164
   
(1,090
)
  
32,396
   
889,877
   
59,587
   
-
   
34,024
   
4.0
   
93,611
   
-
   
796,266
 
                                                 
Non-regulated segment Other technical installations
  
345,819
   
-
   
-
   
-
   
345,819
   
133,954
   
-
   
31,132
   
6.7
   
165,086
   
-
   
180,733
 
                                                 
Subtotal assets related to Other Services and
Production and Commercialization of Liquids
  
42,513,659
   
1,403
   
(1,763
)
  
2,098,116
   
44,611,415
   
15,462,313
   
(5
)
  
1,479,585
       
16,941,893
   
-
   
27,669,522
 
                                                 
Lands
  
482,127
   
-
   
-
   
-
   
482,127
   
-
   
-
   
-
   
-
   
-
   
-
   
482,127
 
                                                 
Buildings and constructions
  
4,828,987
   
-
   
-
   
271,163
   
5,100,150
   
2,478,654
   
-
   
102,251
   
2.0
   
2,580,905
   
-
   
2,519,245
 
                                                 
Facilities and features in building
  
359,134
   
-
   
-
   
-
   
359,134
   
158,342
   
-
   
10,341
   
4.0
   
168,683
   
-
   
190,451
 
                                                 
Machinery, equipment and tools
  
1,503,969
   
68,494
   
-
   
21,857
   
1,594,320
   
885,519
   
-
   
134,490
  

6.7 to 10
   
1,020,009
   
-
   
574,311
 
                                                 
UT Machinery, equipment and tools
  
1,238
   
-
   
-
   
-
   
1,238
   
1,238
   
-
   
-
  

6.7 to 10
   
1,238
   
-
   
-
 
                                                 
Computers and Telecommunication systems
  
6,594,148
   
-
   
-
   
609,407
   
7,203,555
   
4,959,186
   
-
   
459,622
  

6.7 to 20
   
5,418,808
       
1,784,747
 
                                           
-
     
Vehicles
  
696,677
   
9,082
   
(1,692
)
  
-
   
704,067
   
461,561
   
(839
)
  
65,585
   
20
   
526,307
       
177,760
 
                                           
-
     
Furniture
  
311,135
   
200
   
-
   
989
   
312,324
   
302,975
   
-
   
1,676
   
10
   
304,651
       
7,673
 
                                           
-
     
Materials
  
4,277,974
   
2,521,622
   
(16,305
)
  
(2,041,894
)
  
4,741,397
   
-
   
-
   
-
   
-
   
-
       
4,741,397
 
                                                 
Line pack
  
673,285
   
-
   
-
   
52,167
   
725,452
   
37,637
   
-
   
-
   
-
   
37,637
       
687,815
 
                                           
-
     
Works in progress
  
8,022,523
   
4,079,084
   
-
   
(7,783,633
)
  
4,317,974
   
-
   
-
   
-
   
-
   
-
       
4,317,974
 
                                                 
Total
  
195,076,934
   
6,687,083
   
(55,834
)
  
-
   
201,708,183
   
93,580,413
   
(20,944
)
  
6,161,233
       
99,720,702
   
3,114,056
   
98,873,425
 

  
2019
 
                                  
  
Cost
  
Depreciation
    
                                  
                                  
                 
Accumulated at
           
Accumulated at
    
  
Beginning
           
End of the
  
the beginning
           
the end
  
Net
 
Account
 
of the year
  
Additions
  
Retirements
  
Transfers
  
year
  
of the year
  
Retirements
  
For the year
  
rate %
  
of the year
  
book value
 
                                  
                                  
Pipelines
  
83,617,294
   
-
   
(18,148
)
  
2,631,890
   
86,231,036
   
40,478,034
   
(10,547
)
  
2,066,658
   
2.2
   
42,534,145
   
43,696,891
 
                                             
Compressor plants
  
31,950,533
   
544,422
   
(244,896
)
  
2,769,078
   
35,019,137
   
22,137,747
   
(147,638
)
  
1,453,471
  

3.3 to 25
   
23,443,580
   
11,575,557
 
                                             
Other plants
  
36,061
   
-
   
-
   
-
   
36,061
   
10,945
   
-
   
1,224
   
3.3
   
12,169
   
23,892
 
                                             
Stations of regulation and/or
measurement of pressure
  
2,847,785
   
-
   
-
   
104,692
   
2,952,477
   
2,271,328
   
-
   
78,527
   
4.0
   
2,349,855
   
602,622
 
                                             
Other technical installations
  
563,238
   
-
   
-
   
10,129
   
573,367
   
480,646
   
-
   
12,593
   
6.7
   
493,239
   
80,128
 
                                             

                                            
Subtotal assets related to
natural gas transportation service
  
119,014,911
   
544,422
   
(263,044
)
  
5,515,789
   
124,812,078
   
65,378,700
   
(158,185
)
  
3,612,473
       
68,832,988
   
55,979,090
 
                                             
Non-regulated segment Pipelines
  
169,943
   
-
   
-
   
13,763,807
   
13,933,750
   
86,262
   
-
   
85,737
   
2.2
   
171,999
   
13,761,751
 
                                             
Non-regulated segment Compressor plants
  
2,601,276
   
-
   
-
   
198,228
   
2,799,504
   
793,286
   
-
   
296,012
  

3.3 to 25
   
1,089,298
   
1,710,206
 
                                             
Non-regulated segment Other plants
  
18,142,640
   
-
   
-
   
6,434,539
   
24,577,179
   
13,582,007
   
-
   
425,468
   
3.3
   
14,007,475
   
10,569,704
 
                                             
Non-regulated segment Stations of regulation and/or
measurement of pressure
  
218,552
   
15,362
   
-
   
623,493
   
857,407
   
43,819
   
-
   
15,768
   
4.0
   
59,587
   
797,820
 
                                             
Non-regulated segment Other technical installations
  
345,819
   
-
   
-
   
-
   
345,819
   
102,821
   
-
   
31,133
   
6.7
   
133,954
   
211,865
 
                                             
Subtotal assets related to Other Services and
Production and Commercialization of Liquids
  
21,478,230
   
15,362
   
-
   
21,020,067
   
42,513,659
   
14,608,195
   
-
   
854,118
       
15,462,313
   
27,051,346
 
                                             
Lands
  
224,817
   
257,310
   
-
   
-
   
482,127
   
-
   
-
   
-
   
-
   
-
   
482,127
 
                                             
Buildings and constructions
  
4,247,069
   
-
   
(1,291
)
  
583,209
   
4,828,987
   
2,398,379
   
(15
)
  
80,290
   
2.0
   
2,478,654
   
2,350,333
 
                                             
Facilities and features in building
  
359,002
   
-
   
-
   
132
   
359,134
   
143,466
   
-
   
14,876
   
4.0
   
158,342
   
200,792
 
                                             
Machinery, equipment and tools
  
1,271,121
   
234,960
   
(10,562
)
  
8,450
   
1,503,969
   
787,159
   
(10,562
)
  
108,922
  

6.7 to 10
   
885,519
   
618,450
 
                                             
UT Machinery, equipment and tools
  
1,238
   
-
   
-
   
-
   
1,238
   
934
   
-
   
304
  

6.7 to 10
   
1,238
   
-
 
                                             
Computers and Telecommunication systems
  
5,687,422
   
4,683
   
-
   
902,043
   
6,594,148
   
4,657,053
   
-
   
302,133
  

6.7 to 20
   
4,959,186
   
1,634,962
 
                                             
Vehicles
  
619,944
   
110,083
   
(33,350
)
  
-
   
696,677
   
436,636
   
(31,508
)
  
56,433
   
20
   
461,561
   
235,116
 
                                             
Furniture
  
311,135
   
-
   
-
   
-
   
311,135
   
301,290
   
-
   
1,685
   
10
   
302,975
   
8,160
 
                                             
Materials
  
3,217,600
   
3,075,586
   
(29,331
)
  
(1,985,881
)
  
4,277,974
   
-
   
-
   
-
   
-
   
-
   
4,277,974
 
                                             
Line pack
  
787,855
   
-
   
-
   
(114,570
)
  
673,285
   
37,637
   
-
   
-
   
-
   
37,637
   
635,648
 
                                             
Works in progress
  
12,547,544
   
21,404,218
   
-
   
(25,929,239
)
  
8,022,523
   
-
   
-
   
-
   
-
   
-
   
8,022,523
 
                                             
Total
  
169,767,888
   
25,646,624
   
(337,578
)
  
-
   
195,076,934
   
88,749,449
   
(200,270
)
  
5,031,234
       
93,580,413
   
101,496,521
 
Quantitative Information of Right-of-use Assets
As of December 31, 2020 and 2019, the assets related to the Other Services and Production and Commercialization of Liquids segments contains the following assets for right of use:

  
2020
  
2019
 
Other plants
  
518,778
   
610,326
 
Compressor plants
  
1,287,986
   
1,515,277
 
Other technical installations
  
146,454
   
172,300
 
Total
  
1,953,218
   
2,297,903
 

The book value variation of the rights-of use accounted during the years ended on December 31, 2020 and 2019 corresponds to its depreciation:

  
2020
  
2019
 
Other plants
  
(91,549
)
  
(91,549
)
Compressor plants
  
(227,292
)
  
(227,292
)
Other technical installations
  
(25,844
)
  
(25,845
)
Total
  
(344,685
)
  
(344,686
)