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31 Net Operating Revenue (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net operating revenue [line items]      
Gross operating revenues R$ 25,227,782 R$ 23,725,810 R$ 21,574,289
PIS/Pasep and Cofins (2,161,120) (2,117,800) (1,788,714)
Recovery of Pis/Pasep and Cofins on ICMS (105,184)    
ICMS (VAT) (4,656,686) (4,210,382) (3,734,940)
Sectorial charges (2,161,811) 2,457,562 (2,020,674)
Service tax (ISSQN) (3,891) (5,286) (5,388)
Net operating revenues 16,244,274 14,934,780 14,024,573
Electricity Sales To Final Customers [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 10,481,794 10,104,045 8,689,516
PIS/Pasep and Cofins (965,651)    
ICMS (VAT) (2,336,583)    
Sectorial charges (753,544)    
Service tax (ISSQN)    
Net operating revenues 6,426,016 5,548,584 4,681,533
Electricity Sales To Final Customers [Member] | Residential [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 3,336,432 3,175,290 2,750,514
Electricity Sales To Final Customers [Member] | Industrial [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,276,105 1,419,240 1,337,893
Electricity Sales To Final Customers [Member] | Trade, Services and Other Activities [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 2,179,510 2,136,087 1,880,862
Electricity Sales To Final Customers [Member] | Rural [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 631,527 572,361 511,196
Electricity Sales To Final Customers [Member] | Public Entities [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 279,495 262,705 236,719
Electricity Sales To Final Customers [Member] | Public Lighting [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 274,250 278,645 244,381
Electricity Sales To Final Customers [Member] | Public Service [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 332,414 316,307 275,431
Electricity Sales To Final Customers [Member] | Free Consumers [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,179,314 845,964
Electricity Sales To Final Customers [Member] | Donations and Grants [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 740,787 764,096 606,556
Electricity Sales To Final Customers [Member] | Free Consumers [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,431,274    
Electricity Sales To Distributors [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 3,301,336 3,136,244 3,529,770
PIS/Pasep and Cofins (368,101)    
ICMS (VAT) (10,727)    
Sectorial charges (56,642)    
Service tax (ISSQN)    
Net operating revenues 2,865,866 3,136,244 3,176,354
Electricity Sales To Distributors [Member] | Bilateral Contracts [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,998,617 2,002,077 1,947,862
Electricity Sales To Distributors [Member] | Regulated contracts [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 854,239 385,157 421,805
Electricity Sales To Distributors [Member] | Electric Energy Trade Chamber CCEE [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 357,076 663,024  
Electricity Sales To Distributors [Member] | Interest [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 91,404 85,986 82,160
Electricity Sales To Distributors [Member] | Concessionaires And Generators [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 62,414    
Electricity Sales To Distributors [Member] | Electric Energy Trade Chamber - CCEE [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 357,076   1,077,943
Use Of The Main Distribution and Transmission Grid [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 8,270,996 3,469,060 6,442,761
PIS/Pasep and Cofins (781,017)    
ICMS (VAT) (1,999,583)    
Sectorial charges (1,351,625)    
Service tax (ISSQN)    
Net operating revenues 4,138,771   3,617,941
Use Of The Main Distribution and Transmission Grid [Member] | Residential [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 2,585,892 2,222,621 2,025,400
Use Of The Main Distribution and Transmission Grid [Member] | Industrial [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,280,168 1,110,089 1,024,452
Use Of The Main Distribution and Transmission Grid [Member] | Trade, Services and Other Activities [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,713,632 1,407,156 1,304,285
Use Of The Main Distribution and Transmission Grid [Member] | Rural [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 467,044   341,875
Use Of The Main Distribution and Transmission Grid [Member] | Public Entities [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 206,492 185,383 174,427
Use Of The Main Distribution and Transmission Grid [Member] | Public Lighting [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 206,492 184,530 167,907
Use Of The Main Distribution and Transmission Grid [Member] | Public Service [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 174,414 141,556 126,795
Use Of The Main Distribution and Transmission Grid [Member] | Free Consumers [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,052,535 795,105 663,248
Use Of The Main Distribution and Transmission Grid [Member] | Concessionaires And Generators [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   80,329 60,485
Use Of The Main Distribution and Transmission Grid [Member] | Interest Income [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   58,578  
Use Of The Main Distribution and Transmission Grid [Member] | Operating and Maintenance Income - O&M [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 98,207   113,324
Use Of The Main Distribution and Transmission Grid [Member] | Interest Income [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 413,171   440,563
Construction Income [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,132,884 1,097,313 868,001
PIS/Pasep and Cofins    
ICMS (VAT)    
Sectorial charges    
Service tax (ISSQN)    
Net operating revenues 1,132,884 1,097,313 868,001
Fair Value Of Assets From The Indemnity For The Concession [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 36,646 47,499 57,080
PIS/Pasep and Cofins    
ICMS (VAT)    
Sectorial charges    
Service tax (ISSQN)    
Net operating revenues 36,646 47,499 57,080
Telecommunications [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 532,926 512,540 426,773
PIS/Pasep and Cofins (21,035)    
ICMS (VAT) (137,896)    
Sectorial charges    
Service tax (ISSQN) (558)    
Net operating revenues 373,437 512,540 308,952
Distribution Of Piped Gas [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,003,790 753,222 621,992
PIS/Pasep and Cofins 11,313    
ICMS (VAT) (171,897)    
Sectorial charges    
Service tax (ISSQN) (23)    
Net operating revenues 843,183 557,186 454,815
Sectorial Financial Assets and Liabilities Result [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 25,057 985,344 767,040
PIS/Pasep and Cofins (6,426)    
ICMS (VAT)    
Sectorial charges    
Service tax (ISSQN)    
Net operating revenues 18,631 893,688 718,826
Other Operating Revenue [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 442,353 222,329 171,356
PIS/Pasep and Cofins (30,203)    
ICMS (VAT)    
Sectorial charges    
Service tax (ISSQN) (3,310)    
Net operating revenues 408,840 189,355 141,071
Other Operating Revenue [Member] | Other Income [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 22,146 11,892 15,898
Other Operating Revenue [Member] | Charged Service [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 18,807 18,475 15,981
Other Operating Revenue [Member] | Income From Rendering Of Services [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 51,780 59,280 30,247
Other Operating Revenue [Member] | Leasing And Rent [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 144,744 132,682 109,230
Distribution Of Piped Gas [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,003,790    
Fair Value In The Purchase and Sale Of Power In The Active Market [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues R$ 204,876