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10 Accounts Receivable Concessions (Tables)
 12 Months Ended
Dec. 31, 2019
Accounts Receivable Concessions  
Accounts Receivable Related to the Concession
  12.31.2019 12.31.2018
Power distribution service concession (10.1)    836,818    783,023
Piped gas distribution service concession (10.2)    324,385    322,259
Bonus from the grant of concession agreements under the quota system (10.3)    647,984    625,772
Remeasurement of RBSE assets (10.4)    739,269    753,826
Generation concession agreements (10.5)   69,182   65,811
     2,617,638    2,550,691
Current   58,842   53,177
Noncurrent    2,558,796    2,497,514
Distribution Concession Agreement

10.1    Power distribution service concession 

Balance as of January 1, 2018    684,206
Transfers from contract assets (Note 11.1)   66,380
Transfers to other receivables (assets held for disposal)    (1,334)
Fair value recognition   35,306
Loss on disposal    (1,535)
Balance as of December 31, 2018    783,023
Transfers from contract assets (Note 11.1)   28,987
Transfers to investments    348
Transfers to other receivables (assets held for disposal)    (1,578)
Fair value recognition   26,231
Incorporations (a) (75)
Loss on disposal   (118)
Balance as of December 31, 2019    836,818
(a) Incorporation of assets and equipment through transfer free of charge, of which the amounts were classified in concession related receivables and in intangible assets (Note 18.1).
Piped gas distribution service concession

10.2    Piped gas distribution service concession 

Balance as of January 1, 2018    303,668
Transfers from contract assets (Note 11.2) 6,399
Fair value recognition   12,193
Loss on disposal    (1)
Balance as of December 31, 2018    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
Bonus from the Grant of Concession Agreements

 10.3    Bonus from the grant of concession agreements under the quota system

   
Balance as of January 1, 2018    606,479
Transfers to electricity grid use charges - customers (66,693)
Interest (Note 31.1)   85,986
Balance as of December 31, 2018    625,772
Transfers to electricity grid use charges - customers (69,192)
Interest (Note 31.1)   91,404
Balance as of December 31, 2019    647,984
Remeasurement of RBSE Financial Assets

10.4    Remeasurement of RBSE financial assets 

   
Balance as of January 1, 2018    1,418,370
Gain on remeasurement of the cash flow from the RBSE assets   (635,292)
Increase in the estimated amount due to the approval of the report on RBSE assets   82,640
Transfers to electricity grid use charges - customers   (111,892)
Balance as of December 31, 2018    753,826
Gain on the cash flow from the assets   90,346
Transfers to electricity grid use charges - customers   (104,902)
Balance as of December 31, 2019    739,270
Concession Agreement - Gas Distribution

Power generation concession contract 

Balance as of January 1, 2018 68,859
Transfers to other current receivables - disposal of assets (9,053)
Gain on remeasurement of the cash flow   1,247
Reversal of impairment (Note 32.4)   4,758
Balance as of December 31, 2018 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