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11 Contract assets (Details 2)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
RBSE Assets [member]  
ContractAssetsLineItems [Line Items]  
Construction income 1.65%
Operating and maintenance margin 1.65%
Remuneration rate 9.58% [1]
Contract correction index  IPCA [2]
Annual RAP, according to Homologatory Resolution R$ 415,455
Construction cost incurred up to 12.31.2020 of works in progress Contract 006/2016 - TL 525 kV Curitiba Leste - Blumenau R$ 238,233
Concession Assets [member]  
ContractAssetsLineItems [Line Items]  
Remuneration rate 9.54% [1]
Contract correction index  IPCA 
Annual RAP, according to Homologatory Resolution R$ 279,406
[1] Average rate of contracts.
[2] Contract 075/2001 - LT 230 kV Bateias - Jaguariaiva, from Copel GET, and contract 002/2005 - LT 525 kV Ivaipora - Londrina, from Uirapuru, are adjusted by the IGPM