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Changes in R&D and EEP balances (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Balance as of December 31, 2020 R$ 665,011 R$ 658,171
Additions 191,006 144,474
Performance agreement 3,010 3,545
Interest rate (Note 34) 14,814 12,550
Payments (149,097) (71,675)
Concluded projects (Note 12 - a) (97,647) (82,054)
Balance as of December 31, 2021 627,097 665,011
F N D C T [Member]    
IfrsStatementLineItems [Line Items]    
Balance as of December 31, 2020 8,085 4,046
Additions 50,804 37,427
Performance agreement
Interest rate (Note 34)
Payments (51,305) (33,388)
Concluded projects (Note 12 - a)
Balance as of December 31, 2021 7,584 8,085
M M E [Member]    
IfrsStatementLineItems [Line Items]    
Balance as of December 31, 2020 4,041 2,023
Additions 25,399 18,716
Performance agreement
Interest rate (Note 34)
Payments (25,650) (16,698)
Concluded projects (Note 12 - a)
Balance as of December 31, 2021 3,790 4,041
R And D [Member]    
IfrsStatementLineItems [Line Items]    
Balance as of December 31, 2020 332,746 341,658
Additions 50,796 37,426
Performance agreement
Interest rate (Note 34) 3,664 4,253
Payments (15,966)
Concluded projects (Note 12 - a) (85,211) (50,591)
Balance as of December 31, 2021 286,029 332,746
Procel [Member]    
IfrsStatementLineItems [Line Items]    
Balance as of December 31, 2020 5,855 16,410
Additions 12,801 10,181
Performance agreement
Interest rate (Note 34) 1,227 1,469
Payments (21,589)
Concluded projects (Note 12 - a)
Balance as of December 31, 2021 19,883 5,855
Energy Efficiency Program [Member]    
IfrsStatementLineItems [Line Items]    
Balance as of December 31, 2020 314,284 294,034
Additions 51,206 40,724
Performance agreement 3,010 3,545
Interest rate (Note 34) 9,923 6,828
Payments (56,176)
Concluded projects (Note 12 - a) (12,436) (31,463)
Balance as of December 31, 2021 R$ 309,811 R$ 314,284