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25 Research and Development and Energy Efficiency (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | R$ 258,733 |  |
Amounts payable to regulatory agencies | 17,981 |  |
Other amounts payable | 388,297 |  |
Research and development and energy efficiency | 665,011 | R$ 658,171 | R$ 592,735
Research and development and energy efficiency, current | 380,186 | 375,395 |
Research and development and energy efficiency, noncurrent | 284,825 | 282,776 |
MME [member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Research and development and energy efficiency | 4,041 | 2,023 | R$ 2,361
Research and Development - R&D [member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | 221,977 |  |
Amounts payable to regulatory agencies | 12,126 |  |
Other amounts payable | 110,769 |  |
Research and development and energy efficiency | 344,872 | 347,727 |
Research and Development - R&D [member] | National Fund for Scientific and Technological Development - FNDCT [member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable to regulatory agencies | 8,085 |  |
Other amounts payable |  |  |
Research and development and energy efficiency | 8,085 | 4,046 |
Research and Development - R&D [member] | MME [member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable to regulatory agencies | 4,041 |  |
Other amounts payable |  |  |
Research and development and energy efficiency | 4,041 | 2,023 |
Research and Development - R&D [member] | R&D [member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | 221,977 |  |
Amounts payable to regulatory agencies |  |  |
Other amounts payable | 110,769 |  |
Research and development and energy efficiency | 332,746 | 341,658 |
EEP [member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | 36,756 |  |
Amounts payable to regulatory agencies | 5,855 |  |
Other amounts payable | 277,528 |  |
Research and development and energy efficiency | 320,139 | 310,444 |
EEP [member] | National Program of electricity conservation - Procel [member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable to regulatory agencies | 5,855 |  |
Other amounts payable |  |  |
Research and development and energy efficiency | 5,855 | 16,410 |
EEP [member] | EEP [member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | 36,756 |  |
Amounts payable to regulatory agencies |  |  |
Other amounts payable | 277,528 |  |
Research and development and energy efficiency | R$ 314,284 | R$ 294,034 |

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