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Property, Plant and Equipment (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Recoverable amount at beginning R$ (688,956) R$ (971,588)
Impairment / Reversal (27,755) 282,632
Transfer   0
Reclassification of Property, Plant and Equipment in Profit or Loss 701,832  
Recoverable amount at ending (14,879) (688,956)
In Service [Member] | H P P [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Recoverable amount at beginning (498,906) (632,559)
Impairment / Reversal 0 133,653
Transfer   0
Reclassification of Property, Plant and Equipment in Profit or Loss 498,906  
Recoverable amount at ending 0 (498,906)
In Service [Member] | U E G Araucaria [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Recoverable amount at beginning 0 (108,132)
Impairment / Reversal 0 108,132
Transfer   0
Reclassification of Property, Plant and Equipment in Profit or Loss 0  
Recoverable amount at ending 0 0
In Service [Member] | Power Plants In Parana [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Recoverable amount at beginning (175,171) (44,514)
Impairment / Reversal (27,755) 40,847
Transfer   (171,504)
Reclassification of Property, Plant and Equipment in Profit or Loss 202,926  
Recoverable amount at ending 0 (175,171)
In Service [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Recoverable amount at beginning (674,077) (785,205)
Impairment / Reversal (27,755) 282,632
Transfer   (171,504)
Reclassification of Property, Plant and Equipment in Profit or Loss 701,832  
Recoverable amount at ending 0 (674,077)
In Progress [Member] | Power Plants In Parana [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Recoverable amount at beginning 0 (171,504)
Impairment / Reversal 0 0
Transfer   171,504
Reclassification of Property, Plant and Equipment in Profit or Loss 0  
Recoverable amount at ending 0 0
In Progress [Member] | Consorcio Tapajos [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Recoverable amount at beginning (14,879) (14,879)
Impairment / Reversal 0 0
Transfer   0
Reclassification of Property, Plant and Equipment in Profit or Loss 0  
Recoverable amount at ending (14,879) (14,879)
In Progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Recoverable amount at beginning (14,879) (186,383)
Impairment / Reversal 0 0
Transfer   171,504
Reclassification of Property, Plant and Equipment in Profit or Loss 0  
Recoverable amount at ending R$ (14,879) R$ (14,879)