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11 Contract assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SummaryOfContractAssetsLineItems [Line Items]      
Contract assets, beginning R$ 3,433,230    
Effect of acquisition of control of Costa Oeste and Marumbi   R$ 66,775  
Transfers to intangible assets (26,789) (28,742) R$ (42,740)
Loss on disposal (7,949) (9,762)  
Contract assets, ending 4,051,384 3,433,230  
Power Distribution Service Concession [Member]      
SummaryOfContractAssetsLineItems [Line Items]      
Contract assets, beginning 640,500  
Transfers from intangible assets   688,346  
Acquisitions 1,021,644 797,832  
Provision for legal claims added to the cost of the works 1,823 4,320  
Transfers to intangible assets (678,680) (668,022)  
Transfers to accounts receivable related to concession (28,987) (66,380)  
Loss on disposal (7,949) (8,832)  
Contract assets, ending 844,284 640,500
Power Distribution Service Concession [Member] | Special Liabilities [Member]      
SummaryOfContractAssetsLineItems [Line Items]      
Contract assets, beginning (24,255)  
Transfers from intangible assets   (26,100)  
Acquisitions  
Customers contributions (106,764)    
Provision for legal claims added to the cost of the works  
Transfers to intangible assets 93,164 107,679  
Transfers to accounts receivable related to concession 4,088 930  
Loss on disposal  
Contract assets, ending (31,070) (24,255)
Power Distribution Service Concession [Member] | Assets [Member]      
SummaryOfContractAssetsLineItems [Line Items]      
Contract assets, beginning 664,755  
Transfers from intangible assets   714,446  
Acquisitions 1,021,644 797,832  
Customers contributions    
Provision for legal claims added to the cost of the works 1,823 4,320  
Transfers to intangible assets (771,844) (775,701)  
Transfers to accounts receivable related to concession (33,075) (67,310)  
Loss on disposal (7,949) (8,832)  
Contract assets, ending 875,354 664,755
Piped Gas Distribution Service Concession [Member]      
SummaryOfContractAssetsLineItems [Line Items]      
Contract assets, beginning 25,718  
Transfers from intangible assets   19,471  
Acquisitions 17,590 15,618  
Transfers to intangible assets   (2,042)  
Transfers to accounts receivable related to concession (16,574) (6,399)  
Loss on disposal   (930)  
Contract assets, ending 26,734 25,718
Power Transmission Concession [Member]      
SummaryOfContractAssetsLineItems [Line Items]      
Contract assets, beginning 2,767,012  
Transfers from accounts receivable related to concession   1,497,399  
Transfers from accounts receivable related to concession - RBSE   635,292  
Effect of acquisition of control of Costa Oeste and Marumbi   258,908  
Transfers to electricity grid use charges - customers (286,158) (243,247)  
Transfers to property, plant and equipment (3,353) (501)  
Transfers from litigations (313) 8,277  
Business combinations effects 117,942    
Realization of gains/losses in business combinations 282    
Remuneration 368,514 268,904  
Construction revenue 173,733 297,018  
Construction income 42,707 44,962  
Contract assets, ending R$ 3,180,366 R$ 2,767,012