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18 Intangible assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning R$ 6,332,611  
Loss on disposal (52,811)  
Intangible assets, ending 6,929,456 R$ 6,332,611
Distribution Concession Agreement in Service [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 8,487,265 8,212,792
Incorporations   2,625
Amortization of quotas - concession and authorization [1] (485,677) (461,370)
Amortization of quotas - PIS/Pasep and Cofins credits (10,655) (10,740)
Loss on disposal (52,656) (26,359)
Transfers to other receivables (1,372) (1,520)
Transfers to investments   (7)
Transfers from contract assets 1,016,482 771,844
Transfers from accounts receivable - concessions 99  
Intangible assets, ending 8,953,486 8,487,265
Distribution Concession Agreement Special Liabilities in Service [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning (2,783,579) (2,822,729)
Incorporations   (2,550)
Amortization of quotas - concession and authorization [1] 138,596 134,864
Transfers from contract assets (105,116) (93,164)
Intangible assets, ending (2,750,099) (2,783,579)
Distribution Concession Agreement [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 5,703,686 5,390,063
Incorporations   75
Amortization of quotas - concession and authorization [1] 347,081 326,506
Amortization of quotas - PIS/Pasep and Cofins credits (10,655) (10,740)
Loss on disposal (52,656) (26,359)
Transfers to other receivables (1,372) (1,520)
Transfers to investments   (7)
Transfers from contract assets 911,366 678,680
Transfers from accounts receivable - concessions 99  
Intangible assets, ending 6,203,387 5,703,686
Generation Concession Agreement in Service [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 209,467 226,411
Capitalizations for intangible in service 3,682  
Amortization of quotas - concession and authorization [2] (17,527) (16,944)
ANEEL grant - use of public property  
Business combination (Note 1.2)  
Intangible assets, ending 195,622 209,467
Generation Concession Agreement in Progress [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning [3]
Capitalizations for intangible in service [3] (3,682)  
Amortization of quotas - concession and authorization [2],[3]  
ANEEL grant - use of public property [3] 3,682  
Business combination (Note 1.2) [3]  
Intangible assets, ending [3]
Generation Concession Agreement Concession Authorization Rights [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 373,204 367,441
Capitalizations for intangible in service
Amortization of quotas - concession and authorization [2] (14,986) (14,350)
Business combination (Note 1.2)   20,113
Intangible assets, ending 358,218 373,204
Generation Concession Agreement [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 582,671 593,852
Amortization of quotas - concession and authorization [2] (32,513) (31,294)
ANEEL grant - use of public property 3,682  
Business combination (Note 1.2)   20,113
Intangible assets, ending 553,840 582,671
Gas Distribution [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 3,619
Amortization of quotas - concession and authorization (29,243) [4] (28,454)
Loss on disposal 151  
Transfers from contract assets 7,277  
Transfers from accounts receivable - concessions 154,483 24,835
Intangible assets, ending 132,366
Other in Service [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 31,620 25,630
Acquisitions 128
Transfers from property, plant and equipment 229 (1,471)
Capitalizations for intangible in service 7,136 16,118
Amortization of quotas - concession and authorization [4] (11,584) (8,646)
Amortization of quotas - PIS/Pasep and Cofins credits (13) (11)
Loss on disposal
Reclassification [1]  
Intangible assets, ending 19,209 31,620
Other in Progress [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 14,634 15,933
Acquisitions 10,863 5,032
Transfers from property, plant and equipment 2,932 10,217
Capitalizations for intangible in service (7,136) (16,118)
Loss on disposal 4 430
Reclassification [1] (635)  
Intangible assets, ending 20,654 14,634
Other [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 46,254 41,563
Acquisitions 10,991 5,032
Transfers from property, plant and equipment 3,161 8,746
Amortization of quotas - concession and authorization [4] (11,584) 8,646
Amortization of quotas - PIS/Pasep and Cofins credits (13) (11)
Loss on disposal 4 430
Reclassification [1] (8,942)  
Intangible assets, ending R$ 39,863 R$ 46,254
[1] Reclassification to Assets classified as held for sale (Note 40).
[2] Amortization during the concession/authorization as of the start of commercial operations of the enterprises.
[3] Includes the balances of use of public asset and hydrological risk renegotiation
[4] Annual amortization rate: 20%.