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Research and Development and Energy Efficiency (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
Amounts payable, balance to be collected | R$ 44,466 |  |
Amounts payable, balance to disburse | 216,550 |  |
Research and development and energy efficiency | 553,674 | R$ 614,758 | R$ 627,097
Amounts payable, disbursed and not completed | 292,658 |  |
Research and development and energy efficiency, current | 320,196 | 370,244 |
Research and development and energy efficiency, noncurrent | 233,478 | 244,514 |
M M E [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Research and development and energy efficiency | 2,891 | 3,314 | 3,790
R And D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Research and development and energy efficiency | 201,871 | 260,243 | R$ 286,029
Research And Development [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Amounts payable, balance to be collected | 10,031 |  |
Amounts payable, balance to disburse | 47,464 |  |
Research and development and energy efficiency | 210,543 | 270,145 |
Amounts payable, disbursed and not completed | 153,048 |  |
Research And Development [Member] | National Fund For Scientific And Technological [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Amounts payable, balance to be collected | 5,781 |  |
Amounts payable, balance to disburse |  |  |
Research and development and energy efficiency | 5,781 | 6,588 |
Research And Development [Member] | M M E [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Amounts payable, balance to be collected | 2,891 |  |
Amounts payable, balance to disburse |  |  |
Research and development and energy efficiency | 2,891 | 3,314 |
Research And Development [Member] | R And D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Amounts payable, balance to be collected | 1,359 |  |
Amounts payable, balance to disburse | 47,464 |  |
Research and development and energy efficiency | 201,871 | 260,243 |
Amounts payable, disbursed and not completed | 153,048 |  |
Energy Efficiency Program [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Amounts payable, balance to be collected | 34,435 |  |
Amounts payable, balance to disburse | 169,086 |  |
Research and development and energy efficiency | 343,131 | 344,613 |
Amounts payable, disbursed and not completed | 139,610 |  |
Energy Efficiency Program [Member] | National Program Of Electricity Conservation Procel [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Amounts payable, balance to be collected | 23,613 |  |
Amounts payable, balance to disburse |  |  |
Research and development and energy efficiency | 23,613 | 11,960 |
Energy Efficiency Program [Member] | E E P [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Amounts payable, balance to be collected | 10,822 |  |
Amounts payable, balance to disburse | 169,086 |  |
Research and development and energy efficiency | 319,518 | R$ 332,653 |
Amounts payable, disbursed and not completed | R$ 139,610 |  |

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