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Balances recognized for investment in Research and Development (R&D) activities and the Energy Efficiency Program (EEP) (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies R$ 35,130    
Other amounts payable 302,618    
Research and development and energy efficiency 627,097 R$ 665,011 R$ 658,171
Amounts payable, before any related prepayments 289,349    
Research and development and energy efficiency, current 292,495 380,186  
Research and development and energy efficiency, noncurrent 334,602 284,825  
M M E [Member]      
IfrsStatementLineItems [Line Items]      
Research and development and energy efficiency 3,790 4,041 2,023
R And D [Member]      
IfrsStatementLineItems [Line Items]      
Research and development and energy efficiency 286,029 332,746 R$ 341,658
Research And Development [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 12,673    
Other amounts payable 89,671    
Research and development and energy efficiency 297,403 344,872  
Amounts payable, before any related prepayments 195,059    
Research And Development [Member] | National Fund For Scientific And Technological [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 7,584    
Other amounts payable    
Research and development and energy efficiency 7,584 8,085  
Research And Development [Member] | M M E [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 3,790    
Other amounts payable    
Research and development and energy efficiency 3,790 4,041  
Research And Development [Member] | R And D [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 1,299    
Other amounts payable 89,671    
Research and development and energy efficiency 286,029 332,746  
Amounts payable, before any related prepayments 195,059    
Energy Efficiency Program [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 22,457    
Other amounts payable 212,947    
Research and development and energy efficiency 329,694 320,139  
Amounts payable, before any related prepayments 94,290    
Energy Efficiency Program [Member] | National Program Of Electricity Conservation Procel [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 19,883    
Other amounts payable    
Research and development and energy efficiency 19,883 5,855  
Energy Efficiency Program [Member] | E E P [Member]      
IfrsStatementLineItems [Line Items]      
Amounts payable to regulatory agencies 2,574    
Other amounts payable 212,947    
Research and development and energy efficiency 309,811 R$ 314,284  
Amounts payable, before any related prepayments R$ 94,290