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Research and Development and Energy Efficiency (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies R$ 25,090    
Other amounts payable 231,527    
Research and development and energy efficiency 614,758 R$ 627,097 R$ 665,011
Amounts payable, before any related prepayments 358,141    
Research and development and energy efficiency, current 370,244 292,495  
Research and development and energy efficiency, noncurrent 244,514 334,602  
M M E [Member]      
IfrsStatementLineItems [Line Items]      
Research and development and energy efficiency 3,314 3,790 4,041
R And D [Member]      
IfrsStatementLineItems [Line Items]      
Research and development and energy efficiency 260,243 286,029 R$ 332,746
Research And Development [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 11,224    
Other amounts payable 29,631    
Research and development and energy efficiency 270,145 297,403  
Amounts payable, before any related prepayments 229,290    
Research And Development [Member] | National Fund For Scientific And Technological [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 6,588    
Other amounts payable (0)    
Research and development and energy efficiency 6,588 7,584  
Research And Development [Member] | M M E [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 3,314    
Other amounts payable (0)    
Research and development and energy efficiency 3,314 3,790  
Research And Development [Member] | R And D [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 1,322    
Other amounts payable 29,631    
Research and development and energy efficiency 260,243 286,029  
Amounts payable, before any related prepayments 229,290    
Energy Efficiency Program [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 13,866    
Other amounts payable 201,896    
Research and development and energy efficiency 344,613 329,694  
Amounts payable, before any related prepayments 128,851    
Energy Efficiency Program [Member] | National Program Of Electricity Conservation Procel [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 11,960    
Other amounts payable (0)    
Research and development and energy efficiency 11,960 19,883  
Energy Efficiency Program [Member] | E E P [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 1,906    
Other amounts payable 201,896    
Research and development and energy efficiency 332,653 R$ 309,811  
Amounts payable, before any related prepayments R$ 128,851