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18 Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of detailed information about intangible assets [abstract]  
Schedule of inangible assets
  12.31.2020 12.31.2019
Concession agreement - distribution of electricity (18.1)  6,203,387  5,703,686
Generation concession agreements/ authorization (18.2) 553,840 582,671
Concession agreement - piped gas distribution (18.3) 132,366  -
Others (18.4) 39,863 46,254
   6,929,456  6,332,611
Schedule of changes in intangible assets
18.1 Power distribution service concession
.      
  Intangible asset Special liabilities  
  in service in service Total 
Balance as of January 1, 2019 8,212,792 (2,822,729)  5,390,063
Incorporations (Note 10.1) 2,625 (2,550) 75
Transfers from contract assets (Note 11.1)  771,844 (93,164) 678,680
Transfers to investments  (7) -  (7)
Transfers to other receivables  (1,520) -  (1,520)
Amortization of quotas - concession (a) (461,370) 134,864  (326,506)
Amortization of quotas - PIS/Pasep and Cofins credits  (10,740) -  (10,740)
Loss on disposal  (26,359) -  (26,359)
Balance as of December 31, 2019 8,487,265 (2,783,579)  5,703,686
Transfers from accounts receivable - concessions (Note 10.1)  99 - 99
Transfers from contract assets (Note 11.1) 1,016,482  (105,116) 911,366
Transfers to other receivables  (1,372) -  (1,372)
Amortization of quotas - concession (a) (485,677) 138,596  (347,081)
Amortization of quotas - PIS/Pasep and Cofins credits  (10,655) -  (10,655)
Loss on disposal  (52,656) -  (52,656)
Balance as of December 31, 2020 8,953,486 (2,750,099)  6,203,387
(a) Amortization during the concession as of the start of commercial operations of the enterprises or based on the useful life of the assets, of the two the shortest.
Schedule of generation concession agreements
18.2 Generation concession agreements
.        
    Concession contract (a) Concession and   
  in service  in progress authorization rights Total 
Balance as of January 1, 2019  226,411  -  367,441  593,852
Business combination effects -  -  20,113  20,113
Amortization of quotas - concession and authorization (b) (16,944)  - (14,350) (31,294)
Balance as of December 31, 2019  209,467  -  373,204  582,671
ANEEL grant - use of public property - 3,682 -  3,682
Amortization of quotas - concession and authorization (b) (17,527)  - (14,986) (32,513)
Capitalizations for intangible in service  3,682  (3,682) - -
Balance as of December 31, 2020  195,622  -  358,218  553,840
(a) Includes the balances of use of public asset and hydrological risk renegotiation
(b) Amortization during the concession/authorization as of the start of commercial operations of the enterprises.
Schedule of piped gas distribution service concession
18.3 Piped gas distribution service concession
.  
  Total 
Balance as of January 1, 2019  3,619
Transfers from accounts receivable - concessions (Note 10.2)  24,835
Amortization of quotas - concession (28,454)
Balance as of December 31, 2019 -
Transfers from contract assets (Note 11.2)  7,277
Transfers from accounts receivable - concessions (Note 10.2)  154,483
Amortization of quotas - concession (29,243)
Loss on disposal (151)
Balance as of December 31, 2020  132,366
Schedule of other intangible assets
18.4 Other intangible assets
.      
  in service  in progress Total 
Balance as of January 1, 2019  25,630 15,933 41,563
Acquisitions -  5,032 5,032
Transfers from property, plant and equipment (1,471) 10,217 8,746
Capitalizations for intangible in service  16,118  (16,118)  -
Amortization of quotas (a) (8,646) -  (8,646)
Amortization of quotas - PIS/Pasep and Cofins credits (11) - (11)
Loss on disposal -  (430) (430)
Balance as of December 31, 2019  31,620 14,634 46,254
Acquisitions 128 10,863 10,991
Transfers from property, plant and equipment 229  2,932 3,161
Capitalizations for intangible in service  7,136 (7,136)  -
Amortization of quotas (a) (11,584) -  (11,584)
Amortization of quotas - PIS/Pasep and Cofins credits (13) - (13)
Loss on disposal -  (4)  (4)
(-) Reclassification (b) (8,307)  (635)  (8,942)
Balance as of December 31, 2020  19,209 20,654 39,863
(a) Annual amortization rate: 20%.
(b) Reclassification to Assets classified as held for sale (Note 40).