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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 |  |

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