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25 Research and Development and Energy Efficiency (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning R$ 592,735 R$ 532,475
Effect of acquisition of control of Costa Oeste and Marumbi 1,494 499
Additions 127,432 123,306
Performance agreement 3,246 2,063
Interest rate 24,570 25,407
Payments (54,166) (47,575)
Concluded projects (37,140) (43,440)
Research and development and energy efficiency, ending 658,171 592,735
FNDCT [Member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 4,725 5,232
Effect of acquisition of control of Costa Oeste and Marumbi 20 23
Additions 32,311 31,186
Performance agreement   0
Interest rate   0
Payments (33,010) (31,716)
Concluded projects   0
Research and development and energy efficiency, ending 4,046 4,725
MME [Member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 2,361 2,616
Effect of acquisition of control of Costa Oeste and Marumbi 10 9
Additions 16,155 15,595
Performance agreement   0
Interest rate   0
Payments (16,503) (15,859)
Concluded projects   0
Research and development and energy efficiency, ending 2,023 2,361
P&D [Member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 327,626 316,121
Effect of acquisition of control of Costa Oeste and Marumbi 1,464 467
Additions 32,312 31,188
Performance agreement   0
Interest rate 10,627 12,627
Payments   0
Concluded projects (30,371) (32,777)
Research and development and energy efficiency, ending 341,658 327,626
Procel [Member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 15,792 6,041
Effect of acquisition of control of Costa Oeste and Marumbi   0
Additions 9,333 9,067
Performance agreement   0
Interest rate 51 684
Transfers (3,123)  
Payments (5,643) 0
Concluded projects   0
Research and development and energy efficiency, ending 16,410 15,792
PEE [Member]    
DisclosureOfChangesInResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]    
Research and development and energy efficiency, beginning 242,231 202,465
Effect of acquisition of control of Costa Oeste and Marumbi   0
Additions 37,321 36,270
Performance agreement 3,246 2,063
Interest rate 13,892 12,096
Transfers 3,123  
Payments 990 0
Concluded projects (6,769) (10,663)
Research and development and energy efficiency, ending R$ 294,034 R$ 242,231