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Research and Development and Energy Efficiency (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Amounts payable, disbursed and not completed R$ 200,780    
Amounts payable, balance to be collected 21,335    
Amounts payable, balance to disburse 198,328    
Research and development and energy efficiency 420,443 R$ 553,674 R$ 614,758
Research and development and energy efficiency, current 179,149 320,196  
Research and development and energy efficiency, noncurrent 241,294 233,478  
M M E [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Research and development and energy efficiency 3,608 2,891 3,314
R And D [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Research and development and energy efficiency 109,233 201,871 R$ 260,243
Research And Development [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Amounts payable, disbursed and not completed 62,948    
Amounts payable, balance to be collected 12,359    
Amounts payable, balance to disburse 44,751    
Research and development and energy efficiency 120,058 210,543  
Research And Development [Member] | National Fund For Scientific And Technological [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Amounts payable, disbursed and not completed 0    
Amounts payable, balance to be collected 7,217    
Amounts payable, balance to disburse 0    
Research and development and energy efficiency 7,217 5,781  
Research And Development [Member] | M M E [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Amounts payable, disbursed and not completed 0    
Amounts payable, balance to be collected 3,608    
Amounts payable, balance to disburse 0    
Research and development and energy efficiency 3,608 2,891  
Research And Development [Member] | R And D [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Amounts payable, disbursed and not completed 62,948    
Amounts payable, balance to be collected 1,534    
Amounts payable, balance to disburse 44,751    
Research and development and energy efficiency 109,233 201,871  
Energy Efficiency Program [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Amounts payable, disbursed and not completed 137,832    
Amounts payable, balance to be collected 8,976    
Amounts payable, balance to disburse 153,577    
Research and development and energy efficiency 300,385 343,131  
Energy Efficiency Program [Member] | National Program Of Electricity Conservation Procel [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Amounts payable, disbursed and not completed 0    
Amounts payable, balance to be collected 4,322    
Amounts payable, balance to disburse 0    
Research and development and energy efficiency 4,322 23,613  
Energy Efficiency Program [Member] | E E P [Member]      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]      
Amounts payable, disbursed and not completed 137,832    
Amounts payable, balance to be collected 4,654    
Amounts payable, balance to disburse 153,577    
Research and development and energy efficiency R$ 296,063 R$ 319,518