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35 Financial Instruments (Details 5) - Interest Rate Risk And Monetary Variation [Member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 30, 2019
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Financial assets, Baseline R$ 4,724,540    
Financial assets, projected probable     R$ 162,180
Financial assets, projected scenario 1     121,640
Financial assets, projected scenario 2     81,104
Financial liabilities, Baseline R$ (12,830,234)    
Financial liabilities, projected probable     (456,464)
Financial liabilities, projected scenario 1     (570,580)
Financial liabilities, projected scenario 2     (684,697)
Banco Do Brasil [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High CDI    
Financial liabilities, Baseline R$ (679,976)    
Financial liabilities, projected probable     (22,099)
Financial liabilities, projected scenario 1     (27,624)
Financial liabilities, projected scenario 2     (33,149)
BNDES [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High TJLP    
Financial liabilities, Baseline R$ (2,198,064)    
Financial liabilities, projected probable     (144,299)
Financial liabilities, projected scenario 1     (142,874)
Financial liabilities, projected scenario 2     (171,449)
BNDES [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High IPCA    
Financial liabilities, Baseline R$ (8,288)    
Financial liabilities, projected probable     (209)
Financial liabilities, projected scenario 1     (261)
Financial liabilities, projected scenario 2     (213)
Banco Do Brasil - BNDES Transfer [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High TJLP    
Financial liabilities, Baseline R$ (95,807)    
Financial liabilities, projected probable     (4,982)
Financial liabilities, projected scenario 1     (6,227)
Financial liabilities, projected scenario 2     (7,473)
Caixa Economica Federal [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High TJLP    
Financial liabilities, Baseline R$ (331)    
Financial liabilities, projected probable     (17)
Financial liabilities, projected scenario 1     (22)
Financial liabilities, projected scenario 2     (26)
Other [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk No risk    
Financial liabilities, Baseline R$ (77,261)    
Financial liabilities, projected probable    
Financial liabilities, projected scenario 1    
Financial liabilities, projected scenario 2    
Debentures [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High CDI/SELIC    
Financial liabilities, Baseline R$ (6,464,603)    
Financial liabilities, projected probable     (210,100)
Financial liabilities, projected scenario 1     (262,624)
Financial liabilities, projected scenario 2     (315,149)
2nd Issue De Debentures [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High IPCA    
Financial liabilities, Baseline R$ (1,950,591)    
Financial liabilities, projected probable     (49,155)
Financial liabilities, projected scenario 1     (61,444)
Financial liabilities, projected scenario 2     73,732
3rd Issue De Debentures [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High TJLP    
Financial liabilities, Baseline R$ (125,172)    
Financial liabilities, projected probable     (6,509)
Financial liabilities, projected scenario 1     (8,136)
Financial liabilities, projected scenario 2     (9,763)
Sectorial Financial Liabilities [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High Selic    
Financial liabilities, Baseline R$ (102,284)    
Financial liabilities, projected probable     (3,324)
Financial liabilities, projected scenario 1     (4,155)
Financial liabilities, projected scenario 2     (4,986)
Ordinary Financing of Taxes With The Federal Tax Authorities [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High Selic    
Financial liabilities, Baseline R$ (18,063)    
Financial liabilities, projected probable     (587)
Financial liabilities, projected scenario 1     734
Financial liabilities, projected scenario 2     881
Special Tax Regularization Program - Pert [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High Selic    
Financial liabilities, Baseline R$ (497,207)    
Financial liabilities, projected probable     (16,159)
Financial liabilities, projected scenario 1     (20,199)
Financial liabilities, projected scenario 2     (24,239)
Accounts Payable Related To Concession [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High IGP-M    
Financial liabilities, Baseline R$ (563,756)    
Financial liabilities, projected probable     (27,793)
Financial liabilities, projected scenario 1     (34,741)
Financial liabilities, projected scenario 2     (41,690)
Accounts Payable Related To Concession [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk High IPCA    
Financial liabilities, Baseline R$ (48,831)    
Financial liabilities, projected probable     (1,231)
Financial liabilities, projected scenario 1     (1,538)
Financial liabilities, projected scenario 2     (1,846)
Bonds And Securities [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk Low CDI/SELIC    
Financial assets, Baseline R$ 282,081    
Financial assets, projected probable     9,168
Financial assets, projected scenario 1     6,876
Financial assets, projected scenario 2     4,584
Collaterals And Escrow Accounts [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk Low CDI/SELIC    
Financial assets, Baseline R$ 147    
Financial assets, projected probable     5
Financial assets, projected scenario 1     4
Financial assets, projected scenario 2     2
CRC Transferred To The Parana State Government [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk   Low IGP-DI  
Financial assets, Baseline R$ 1,350,685    
Financial assets, projected probable     66,589
Financial assets, projected scenario 1     49,942
Financial assets, projected scenario 2     33,294
Sectorial Financial Assets [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk Low Selic    
Financial assets, Baseline R$ 473,989    
Financial assets, projected probable     15,405
Financial assets, projected scenario 1     11,553
Financial assets, projected scenario 2     7,702
Accounts Receivable - Concessions [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk Low IPCA    
Financial assets, Baseline R$ 2,548,456    
Financial assets, projected probable     64,221
Financial assets, projected scenario 1     48,166
Financial assets, projected scenario 2     32,111
Accounts Receivable - Generation Concessions [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities risk [1] Undefined    
Financial assets, Baseline R$ 69,182    
Financial assets, projected probable    
Financial assets, projected scenario 1    
Financial assets, projected scenario 2    
[1] Risk assessment still requires ruling by the Granting Authority.