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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

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