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13 Taxes (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning R$ 2,047,358 R$ 1,882,616  
Noncurrent assets, recognized in income (48,084) 132,578  
Noncurrent assets, effects of applying new IFRS   8,474  
Noncurrent assets, business combination effect 6,237 3,696  
Noncurrent assets, recognized in other comprehensive income 63,444 19,994  
Noncurrent assets, ending 2,068,955 2,047,358  
Noncurrent liabilities, beginning 1,197,717    
Noncurrent liabilities, recognized in income 154,064 1,123,754  
Noncurrent liabilities, effects of applying new IFRS   64,506  
Noncurrent liabilities, business combination effect (1,026)    
Noncurrent liabilities, recognized in other comprehensive income   9,457  
Noncurrent liabilities, ending 1,350,755 1,197,717  
Net 849,641 758,862  
Total, recognized in income (202,148) 68,072  
Total, effects of applying new IFRS   8,474  
Total, business combination effect 7,263 (5,761)  
Total, recognized in other comprehensive income 63,444 19,994  
Total 718,200 849,641  
Assets presented in the Statement of Financial Position 1,011,866 1,007,061 R$ 915,492
Liabilities presented in the Statement of Financial Position 293,666 157,420 R$ (156,630)
Provisions for Legal Claims [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 573,177 514,358  
Noncurrent assets, recognized in income (62,044) 55,123  
Noncurrent assets, business combination effect 6,237 3,696  
Noncurrent assets, ending 517,370 573,177  
Post Employment Benefits [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 328,685 293,611  
Noncurrent assets, recognized in income 13,285 15,080  
Noncurrent assets, recognized in other comprehensive income 63,444 19,994  
Noncurrent assets, ending 405,414 328,685  
Impairment of Assets [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 328,011 310,561  
Noncurrent assets, recognized in income 57,456 17,450  
Noncurrent assets, ending 385,467 328,011  
Provision for Energy Purchases [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 154,491 156,325  
Noncurrent assets, recognized in income 10,840 (1,834)  
Noncurrent assets, ending 165,331 154,491  
Expected Credit Losses [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 114,010 113,380  
Noncurrent assets, recognized in income 17,811 (6,838)  
Noncurrent assets, effects of applying new IFRS   7,468  
Noncurrent assets, ending 131,821 114,010  
Tax Losses and Negative Tax Basis [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 71,140 110,658  
Noncurrent assets, recognized in income 27,102 (39,518)  
Noncurrent assets, ending 98,242 71,140  
Social Security Contributions - Injunction on Judicial Deposit [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 67,010 60,856  
Noncurrent assets, recognized in income 4,190 6,154  
Noncurrent assets, ending 71,200 67,010  
Concession Contracts [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 53,339 48,722  
Noncurrent assets, recognized in income 5,005 4,617  
Noncurrent assets, ending 58,344 53,339  
Noncurrent liabilities, beginning 613,658    
Noncurrent liabilities, recognized in income 99,817    
Noncurrent liabilities, business combination effect (1,026)    
Noncurrent liabilities, ending 712,449 613,658  
Provision for Profit Sharing [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 30,548 22,270  
Noncurrent assets, recognized in income 21,567 8,278  
Noncurrent assets, ending 52,115 30,548  
Concession Contracts [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 23,606 24,906  
Noncurrent assets, recognized in income (1,253) (1,300)  
Noncurrent assets, ending 22,353 23,606  
Noncurrent liabilities, beginning   535,726  
Noncurrent liabilities, recognized in income   68,475  
Noncurrent liabilities, business combination effect   9,457  
Research and Development and Energy Efficiency Programs [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 155,570 129,877  
Noncurrent assets, recognized in income (137,531) 25,693  
Noncurrent assets, ending 18,039 155,570  
Others [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning   97,092  
Noncurrent assets, recognized in income   49,673  
Noncurrent assets, effects of applying new IFRS   1,006  
Noncurrent liabilities, beginning   34,877  
Noncurrent liabilities, recognized in income   851  
Deemed Cost [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent liabilities, beginning 415,325 449,884  
Noncurrent liabilities, recognized in income (34,116) (34,559)  
Noncurrent liabilities, ending 381,209 415,325  
Financial Instruments [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent liabilities, beginning 5,030    
Noncurrent liabilities, recognized in income 65,915 5,030  
Noncurrent liabilities, ending 70,945 5,030  
Escrow Deposits Monetary Variation [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent liabilities, beginning 64,167 55,328  
Noncurrent liabilities, recognized in income (3,022) 8,839  
Noncurrent liabilities, ending 61,145 64,167  
Accelerated Depreciation [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent liabilities, beginning 32,682 26,401  
Noncurrent liabilities, recognized in income 17,640 6,281  
Noncurrent liabilities, ending 50,322 32,682  
Transaction Cost On Borrowings and Debentures [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent liabilities, beginning 31,127 21,538  
Noncurrent liabilities, recognized in income 981 9,589  
Noncurrent liabilities, ending 32,108 31,127  
Other [Member]      
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items]      
Noncurrent assets, beginning 147,771    
Noncurrent assets, recognized in income (4,512)    
Noncurrent assets, ending 143,259 147,771  
Noncurrent liabilities, beginning 35,728    
Noncurrent liabilities, recognized in income 6,849    
Noncurrent liabilities, ending R$ 42,577 R$ 35,728