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25 Research and Development and Energy Efficiency (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning R$ 658,171 R$ 592,735
Business combination effects   1,494
Additions 144,474 127,432
Performance agreement 3,545 3,246
Interest rate 12,550 24,570
Transfers
Payments (71,675) (54,166)
Concluded projects (82,054) (37,140)
Research and development and energy efficiency, ending 665,011 658,171
FNDCT [member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 4,046 4,725
Business combination effects   20
Additions 37,427 32,311
Performance agreement
Interest rate
Transfers
Payments (33,388) (33,010)
Concluded projects
Research and development and energy efficiency, ending 8,085 4,046
MME [member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 2,023 2,361
Business combination effects   10
Additions 18,716 16,155
Performance agreement
Interest rate
Transfers
Payments (16,698) (16,503)
Concluded projects
Research and development and energy efficiency, ending 4,041 2,023
R&D [member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 341,658 327,626
Business combination effects   1,464
Additions 37,426 32,312
Performance agreement
Interest rate 4,253 10,627
Transfers
Payments
Concluded projects (50,591) (30,371)
Research and development and energy efficiency, ending 332,746 341,658
Procel [member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 16,410 15,792
Business combination effects  
Additions 10,181 9,333
Performance agreement
Interest rate 1,469 51
Transfers (616) (3,123)
Payments (21,589) (5,643)
Concluded projects
Research and development and energy efficiency, ending 5,855 16,410
EEP [member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 294,034 242,231
Business combination effects  
Additions 40,724 37,321
Performance agreement 3,545 3,246
Interest rate 6,828 13,892
Transfers 616 3,123
Payments 990
Concluded projects (31,463) (6,769)
Research and development and energy efficiency, ending R$ 314,284 R$ 294,034