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10 Accounts Receivable Concessions (Tables)
 12 Months Ended
Dec. 31, 2020
Accounts Receivable Concessions  
Schedule of accounts receivable related to the concession
    Restated Restated
  12.31.2020 12.31.2019 01.01.2019
Power distribution service concession (10.1) 960,518 836,818 783,023
Piped gas distribution service concession (10.2) 189,416 324,385 322,259
Bonus from the grant of concession agreements under the quota system (10.3) 671,204 647,984 625,772
Generation concession agreements (10.4) 81,202 69,182 65,811
   1,902,340  1,878,369  1,796,865
Current  4,515 4,545 4,180
Noncurrent   1,897,825  1,873,824  1,792,685
Schedule of power distribution service concession
10.1 Power distribution service concession
   
Balance as of January 1, 2019 783,023
Transfers from contract assets (Note 11.1) 28,987
Transfers from investments 348
Transfers to other receivables (assets held for disposal) (1,578)
Fair value recognition 26,231
Incorporations  (75)
Loss on disposal  (118)
Balance as of December 31, 2019 836,818
Transfers from contract assets (Note 11.1) 86,154
Transfers to intangible assets (Note 18.1)  (99)
Transfers to other receivables (assets held for disposal) (7,428)
Fair value recognition 45,187
Loss on disposal  (114)
Balance as of December 31, 2020 960,518
Schedule of piped gas distribution service concession
10.2 Piped gas distribution service concession
   
Balance as of January 1, 2019  322,259
Transfers from contract assets (Note 11.2) 16,574
Transfers to intangible assets (Note 18.3)  (24,835)
Fair value recognition 10,415
Loss on disposal (28)
Balance as of December 31, 2019  324,385
Transfers from contract assets (Note 11.2) 7,390
Transfers to intangible assets (Note 18.3) (154,483)
Fair value recognition 12,154
Loss on disposal (30)
Balance as of December 31, 2020  189,416
Schedule of bonus from the grant of concession agreements under the quota system
10.3 Bonus from the grant of concession agreements under the quota system
   
Balance as of January 1, 2019  625,772
Transfers to electricity grid use charges - customers (69,192)
Interest (Note 31)  91,404
Balance as of December 31, 2019  647,984
Transfers to electricity grid use charges - customers (71,087)
Interest (Note 31)  94,307
Balance as of December 31, 2020  671,204
Schedule of power generation concession contract
10.4 Power generation concession contract
   
Balance as of January 1, 2019 65,811
Gain on remeasurement of the cash flow 426
Reversal of impairment (Note 32.4)  2,945
Balance as of December 31, 2019 69,182
Gain on remeasurement of the cash flow  1,518
Reversal of impairment (Note 32.4) 10,502
Balance as of December 31, 2020 81,202