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Research and Development and Energy Efficiency (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Amounts payable, disbursed and not completed | R$ 200,780 |  |
Amounts payable, balance to be collected | 21,335 |  |
Amounts payable, balance to disburse | 198,328 |  |
Research and development and energy efficiency | 420,443 | R$ 553,674 | R$ 614,758
Research and development and energy efficiency, current | 179,149 | 320,196 |
Research and development and energy efficiency, noncurrent | 241,294 | 233,478 |
M M E [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Research and development and energy efficiency | 3,608 | 2,891 | 3,314
R And D [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Research and development and energy efficiency | 109,233 | 201,871 | R$ 260,243
Research And Development [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Amounts payable, disbursed and not completed | 62,948 |  |
Amounts payable, balance to be collected | 12,359 |  |
Amounts payable, balance to disburse | 44,751 |  |
Research and development and energy efficiency | 120,058 | 210,543 |
Research And Development [Member] | National Fund For Scientific And Technological [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Amounts payable, disbursed and not completed | 0 |  |
Amounts payable, balance to be collected | 7,217 |  |
Amounts payable, balance to disburse | 0 |  |
Research and development and energy efficiency | 7,217 | 5,781 |
Research And Development [Member] | M M E [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Amounts payable, disbursed and not completed | 0 |  |
Amounts payable, balance to be collected | 3,608 |  |
Amounts payable, balance to disburse | 0 |  |
Research and development and energy efficiency | 3,608 | 2,891 |
Research And Development [Member] | R And D [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Amounts payable, disbursed and not completed | 62,948 |  |
Amounts payable, balance to be collected | 1,534 |  |
Amounts payable, balance to disburse | 44,751 |  |
Research and development and energy efficiency | 109,233 | 201,871 |
Energy Efficiency Program [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Amounts payable, disbursed and not completed | 137,832 |  |
Amounts payable, balance to be collected | 8,976 |  |
Amounts payable, balance to disburse | 153,577 |  |
Research and development and energy efficiency | 300,385 | 343,131 |
Energy Efficiency Program [Member] | National Program Of Electricity Conservation Procel [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Amounts payable, disbursed and not completed | 0 |  |
Amounts payable, balance to be collected | 4,322 |  |
Amounts payable, balance to disburse | 0 |  |
Research and development and energy efficiency | 4,322 | 23,613 |
Energy Efficiency Program [Member] | E E P [Member] |  |  |
Disclosure of assets and liabilities with significant risk of material adjustment [line items] |  |  |
Amounts payable, disbursed and not completed | 137,832 |  |
Amounts payable, balance to be collected | 4,654 |  |
Amounts payable, balance to disburse | 153,577 |  |
Research and development and energy efficiency | R$ 296,063 | R$ 319,518 |

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