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9. Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, plant and equipment [abstract]  
Property, plant, and equipment
     Lands and buildings    Substations    High, medium and low voltage lines    Meters and Transformer chambers and platforms    Tools, Furniture, vehicles, equipment, communications and advances to suppliers    Construction in process     Supplies and spare parts    Total
 At 12.31.18                                
Cost   2,228,765      21,173,166   58,526,862     24,217,962   4,085,114     20,620,507   300,321   131,152,697
Accumulated depreciation   (374,890)      (6,111,090)     (18,717,354)     (7,936,426)     (1,945,373)     -     -      (35,085,133)
 Net amount   1,853,875      15,062,076   39,809,508     16,281,536   2,139,741     20,620,507   300,321     96,067,564
                                 
Additions     36,602     7,125     158,056   288,631   1,035,592   8,295,716      97,472   9,919,194
Disposals      (51)   (79)   (7,400)   (52,976)     (3,086)     -     -   (63,592)
Transfers      126,361   856,130     4,308,337   2,297,002     (1,120,774)     (6,312,332)     (154,724)     -
Depreciation for the year      (82,502)     (751,050)      (2,165,465)     (1,041,807)     (583,944)     -     -     (4,624,768)
 Net amount 12.31.19   1,934,285      15,174,202   42,103,036     17,772,386   1,467,529     22,603,891   243,069   101,298,398
                                 
 At 12.31.19                                
Cost   2,391,728      22,036,421   62,735,909     26,729,242   3,999,933     22,603,891   243,069   140,740,193
Accumulated depreciation   (457,443)      (6,862,219)     (20,632,873)     (8,956,856)     (2,532,404)     -     -      (39,441,795)
 Net amount   1,934,285      15,174,202   42,103,036     17,772,386   1,467,529     22,603,891   243,069   101,298,398

  

     Lands and buildings    Substations    High, medium and low voltage lines    Meters and Transformer chambers and platforms    Tools, Furniture, vehicles, equipment, communications and advances to suppliers    Construction in process     Supplies and spare parts    Total
 At 12.31.17                                
Cost   2,116,247      20,714,928   56,017,555     23,137,842   3,854,001     13,404,398   139,488   119,384,459
Accumulated depreciation   (315,931)      (5,492,137)     (17,298,877)     (7,133,076)     (1,403,076)     -     -      (31,643,097)
 Net amount   1,800,316      15,222,791   38,718,678     16,004,766   2,450,925     13,404,398   139,488     87,741,362
                                 
Additions     28,827   175,050     585,141      79,220   793,829     11,285,728   199,487     13,147,282
Disposals      (56)      (3,400)      (145,751)   (55,158)     (677,899)     -     -     (882,264)
Transfers      137,239   288,352     2,452,719   1,092,364   137,599     (4,069,619)   (38,654)     -
Depreciation for the year   (112,451)     (620,717)      (1,801,279)     (839,656)     (564,713)     -     -     (3,938,816)
 Net amount 12.31.18   1,853,875      15,062,076   39,809,508     16,281,536   2,139,741     20,620,507   300,321     96,067,564
                                 
 At 12.31.18                                
Cost   2,228,765      21,173,166   58,526,862     24,217,962   4,085,114     20,620,507   300,321   131,152,697
Accumulated depreciation   (374,890)      (6,111,090)     (18,717,354)     (7,936,426)     (1,945,373)     -     -      (35,085,133)
 Net amount   1,853,875      15,062,076   39,809,508     16,281,536   2,139,741     20,620,507   300,321     96,067,564

 

(1)   As of December 31, 2018, includes derecognition of real estate asset for $ 675.5 million.