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Research and Development and Energy Efficiency (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Amounts payable, balance to be collected R$ 44,466    
Amounts payable, balance to disburse 216,550    
Research and development and energy efficiency 553,674 R$ 614,758 R$ 627,097
Amounts payable, disbursed and not completed 292,658    
Research and development and energy efficiency, current 320,196 370,244  
Research and development and energy efficiency, noncurrent 233,478 244,514  
M M E [Member]      
IfrsStatementLineItems [Line Items]      
Research and development and energy efficiency 2,891 3,314 3,790
R And D [Member]      
IfrsStatementLineItems [Line Items]      
Research and development and energy efficiency 201,871 260,243 R$ 286,029
Research And Development [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable, balance to be collected 10,031    
Amounts payable, balance to disburse 47,464    
Research and development and energy efficiency 210,543 270,145  
Amounts payable, disbursed and not completed 153,048    
Research And Development [Member] | National Fund For Scientific And Technological [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable, balance to be collected 5,781    
Amounts payable, balance to disburse    
Research and development and energy efficiency 5,781 6,588  
Research And Development [Member] | M M E [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable, balance to be collected 2,891    
Amounts payable, balance to disburse    
Research and development and energy efficiency 2,891 3,314  
Research And Development [Member] | R And D [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable, balance to be collected 1,359    
Amounts payable, balance to disburse 47,464    
Research and development and energy efficiency 201,871 260,243  
Amounts payable, disbursed and not completed 153,048    
Energy Efficiency Program [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable, balance to be collected 34,435    
Amounts payable, balance to disburse 169,086    
Research and development and energy efficiency 343,131 344,613  
Amounts payable, disbursed and not completed 139,610    
Energy Efficiency Program [Member] | National Program Of Electricity Conservation Procel [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable, balance to be collected 23,613    
Amounts payable, balance to disburse    
Research and development and energy efficiency 23,613 11,960  
Energy Efficiency Program [Member] | E E P [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable, balance to be collected 10,822    
Amounts payable, balance to disburse 169,086    
Research and development and energy efficiency 319,518 R$ 332,653  
Amounts payable, disbursed and not completed R$ 139,610