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17 Property, Plant and Equipment (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total R$ (1,201,182) R$ (1,215,344)
Impairment at the year 117,744 14,162
Transfer  
Recoverable amount at ending (1,083,438) (1,201,182)
In Service [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (3,489) (4,986)
Impairment at the year 142,433 1,497
Transfer (1,100,121)  
Recoverable amount at ending (961,177) (3,489)
In Service [Member] | UEG Araucaria [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total
Impairment at the year (45,547)
Transfer (731,747)  
Recoverable amount at ending (777,294)
In Service [Member] | Wind Power Complex Cutia [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total
Impairment at the year 114,144
Transfer (168,248)  
Recoverable amount at ending (54,104)
In Service [Member] | Wind Power Complex Bento Miguel [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total
Impairment at the year 87,370
Transfer (87,370)  
Recoverable amount at ending
In Service [Member] | Power Plants In Parana [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (3,489) (4,986)
Impairment at the year (13,534) 1,497
Transfer (112,756)  
Recoverable amount at ending (129,779) (3,489)
In Progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (1,197,693) (1,210,358)
Impairment at the year (24,689) 12,665
Transfer 1,100,121  
Recoverable amount at ending (122,261) (1,197,693)
In Progress [Member] | Wind Power Complex Cutia [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (167,875) (224,510)
Impairment at the year (373) 56,635
Transfer 168,248  
Recoverable amount at ending (167,875)
In Progress [Member] | Wind Power Complex Bento Miguel [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (84,621) (98,231)
Impairment at the year (2,749) 13,610
Transfer 87,370  
Recoverable amount at ending (84,621)
In Progress [Member] | Power Plants In Parana [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (199,468) (190,132)
Impairment at the year (21,085) (9,336)
Transfer 112,756  
Recoverable amount at ending (107,797) (199,468)
In Progress [Member] | HPP Colider [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (731,265) (683,021)
Impairment at the year (482) (48,244)
Transfer 731,747  
Recoverable amount at ending (731,265)
In Progress [Member] | Consorcio Tapajos [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (14,464) (14,464)
Impairment at the year [1]
Transfer  
Recoverable amount at ending R$ (14,464) R$ (14,464)
[1] Project under development