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17 Property, Plant and Equipment (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total R$ (1,083,438) R$ (1,201,182)
Impairment at the year 37,609 117,744
Transfer  
Recoverable amount at ending (1,045,829) (1,083,438)
In Progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (122,261) (1,197,693)
Impairment at the year 1,953 (24,689)
Transfer   1,100,121
Recoverable amount at ending (120,308) (122,261)
In Progress [member] | HPP Colider [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (731,265)
Impairment at the year (482)
Transfer   731,747
Recoverable amount at ending
In Progress [member] | Wind Power Complex Cutia [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (167,875)
Impairment at the year (373)
Transfer   168,248
Recoverable amount at ending
In Progress [member] | Wind Power Complex Bento Miguel [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (84,621)
Impairment at the year (2,749)
Transfer   87,370
Recoverable amount at ending
In Progress [member] | Power Plants In Parana [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (107,797) (199,468)
Impairment at the year 1,953 (21,085)
Transfer   112,756
Recoverable amount at ending (105,844) (107,797)
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 (14,464) (14,464)
In Service [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (961,177) 3,489
Impairment at the year 35,656 142,433
Transfer   (1,100,121)
Recoverable amount at ending (925,521) (961,177)
In Service [member] | UHE Colider [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (777,294)
Impairment at the year   (45,547)
Transfer 94,101 (731,747)
Recoverable amount at ending (683,193) (777,294)
In Service [member] | Wind Power Complex Cutia [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total (54,104)
Impairment at the year 54,104 114,144
Transfer   (168,248)
Recoverable amount at ending (54,104)
In Service [member] | UEG Araucaria [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Gross total
Impairment at the year (138,777)
Transfer  
Recoverable amount at ending (138,777)
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 (129,779) (3,489)
Impairment at the year 26,228 (13,534)
Transfer   (112,756)
Recoverable amount at ending R$ (103,551) R$ (129,779)
[1] Project under development