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11 Contract Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Contract assets [abstract]  
Schedule of summary of contract assets
    Restated Restated
  12.31.2020 12.31.2019 01.01.2019
Power distribution service concession (11.1)  1,114,961 844,284 640,500
Piped gas distribution service concession (11.2) 27,254 26,734 25,718
Power transmission concession (11.3)  4,350,582  3,919,635  3,520,838
   5,492,797  4,790,653  4,187,056
Current  285,682 161,740 134,016
Noncurrent   5,207,115  4,628,913  4,053,040
Schedule of power distribution service concession contract
11.1 Power distribution service concession contract
       
  Assets Special liabilities  Total 
Balance as of January 1, 2019  664,755  (24,255) 640,500
Acquisitions  1,021,644  -  1,021,644
Customers contributions - (104,067)  (104,067)
Provision for legal claims added to the cost of the works  1,823  - 1,823
Transfers to intangible assets (Note 18.1) (771,844) 93,164  (678,680)
Transfers to accounts receivable - concessions (Note 10.1) (33,075) 4,088  (28,987)
Loss on disposal (7,949)  -  (7,949)
Balance as of December 31, 2019  875,354  (31,070) 844,284
Acquisitions  1,391,267  -  1,391,267
Customers contributions - (112,689)  (112,689)
Provision for legal claims added to the cost of the works  1,522  - 1,522
Transfers to intangible assets (Note 18.1) (1,016,482)  105,116  (911,366)
Transfers to accounts receivable - concessions (Note 10.1) (94,978) 8,824  (86,154)
Loss on disposal (11,903)  -  (11,903)
Balance as of December 31, 2020  1,144,780  (29,819)  1,114,961
Schedule of piped gas distribution service concession contract
11.2 Piped gas distribution service concession contract
   
Balance as of January 1, 2019 25,718
Acquisitions 17,590
Transfers from/to accounts receivable - concessions (Note 10.2)  (16,574)
Balance as of December 31, 2019 26,734
Acquisitions 15,187
Transfers to intangible assets (Note 18.3) (7,277)
Transfers to accounts receivable - concessions (Note 10.2) (7,390)
Balance as of December 31, 2020 27,254
Schedule of transmission service concession contract
11.3 Transmission service concession contract
       
  Concession assets RBSE assets Total
Restated
Balance as of January 1, 2019 2,166,757  1,354,081  3,520,838
Business combinations efects  117,942  - 117,942
Realization of gains/losses in business combinations  282  - 282
Transfers to electricity grid use charges - customers (176,724)  (214,336)  (391,060)
Transfers to property, plant and equipment  (3,353)  -  (3,353)
Transfer of judicial deposits and litigation (313)  -  (313)
Remuneration  280,630 177,961 458,591
Construction revenue  175,219  - 175,219
Construction income 2,892  - 2,892
Efficiency gain (11.3.1)  38,597  - 38,597
Balance as of December 31, 2019 2,601,929  1,317,706  3,919,635
Realization of gains/losses in business combinations  722  - 722
Transfers to electricity grid use charges - customers (312,120)  (266,027)  (578,147)
Transfers to property, plant and equipment (613)  -  (613)
Transfers from litigations (576)  -  (576)
Remuneration  489,438 291,669 781,107
Construction revenue  255,578  - 255,578
Construction income 4,217  - 4,217
Loss from inefficiency (11.3.1)  (7,654)  -  (7,654)
Write-offs (23,687)  -  (23,687)
Balance as of December 31, 2020 3,007,234  1,343,348  4,350,582
Schedule of assumptions adopted for the calculation of contract assets
11.3.2 Assumptions adopted for the calculation of contract assets
     
  Concession assets RBSE assets
Construction income 1.65% N/A
Operating and maintenance margin 1.65% N/A
Remuneration rate (a)  9,58% p.y.   9,54% p.y. 
Contract correction index  IPCA (b)   IPCA 
Annual RAP, according to Homologatory Resolution 415,455 279,406
Construction cost incurred up to 12.31.2020 of works in progress    
Contract 006/2016 - TL 525 kV Curitiba Leste - Blumenau 238,233  N/A 
 (a)Average rate of contracts 
 (b) Contract 075/2001 - LT 230 kV Bateias - Jaguariaíva, from Copel GET, and contract 002/2005 - LT 525 kV Ivaiporã - Londrina, from Uirapuru, are adjusted by the IGPM.