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25 Research and Development and Energy Efficiency (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | R$ 222,550 |  |
Amounts payable to regulatory agencies | 22,479 |  |
Other amounts payable | 413,142 |  |
Research and development and energy efficiency | 658,171 | R$ 592,735 | R$ 532,475
Research and development and energy efficiency, current | 375,395 | 270,429 |
Research and development and energy efficiency, noncurrent | 282,776 | 322,306 |
MME [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Research and development and energy efficiency | 2,023 | 2,361 | 2,616
FNDCT [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Research and development and energy efficiency | 4,046 | 4,725 | 5,232
P&D [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Research and development and energy efficiency | 341,658 | 327,626 | R$ 316,121
Research and Development - R&D [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | 174,032 |  |
Amounts payable to regulatory agencies | 6,069 |  |
Other amounts payable | 167,626 |  |
Research and development and energy efficiency | 347,727 | 334,712 |
Research and Development - R&D [Member] | National Fund for Scientific and Technological Development - FNDCT [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable to regulatory agencies | 4,046 |  |
Research and development and energy efficiency | 4,046 |  |
Research and Development - R&D [Member] | MME [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable to regulatory agencies | 2,023 |  |
Research and development and energy efficiency | 2,023 |  |
Research and Development - R&D [Member] | R&D [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | 174,032 |  |
Other amounts payable | 167,626 |  |
Research and development and energy efficiency | 341,658 |  |
Energy efficiency program - EEP [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | 48,518 |  |
Amounts payable to regulatory agencies | 16,410 |  |
Other amounts payable | 245,516 |  |
Research and development and energy efficiency | 310,444 | 258,023 |
Energy efficiency program - EEP [Member] | National Program of electricity conservation - Procel [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable to regulatory agencies | 16,410 |  |
Research and development and energy efficiency | 16,410 | 15,792 |
Energy efficiency program - EEP [Member] | EEP [Member] |  |  |
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items] |  |  |
Amounts payable, before any related prepayments | 48,518 |  |
Other amounts payable | 245,516 |  |
Research and development and energy efficiency | R$ 294,034 | R$ 242,231 |

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