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31 Net Operating Revenue (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net operating revenue [line items]      
Gross operating revenues R$ 25,939,794    
PIS/Pasep and Cofins (1,227,978)    
Recovery of Pis/Pasep and Cofins on ICMS (1,755,112)    
ICMS (VAT) (4,216,720)    
Service tax (ISSQN) (4,504)    
Regulatory charges (1,857,343) R$ (2,161,811) R$ (2,457,562)
Net operating revenues 18,633,249    
Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   24,691,379 23,190,729
PIS/Pasep and Cofins   (2,243,383) (2,094,148)
Recovery of Pis/Pasep and Cofins on ICMS   (105,184)
ICMS (VAT)   (4,518,791) (4,085,153)
Service tax (ISSQN)   (3,333) (3,402)
Regulatory charges   (2,161,811) (2,457,562)
Net operating revenues   15,869,245 14,550,464
Electricity sales to final customers [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 9,524,897    
PIS/Pasep and Cofins (737,647)    
ICMS (VAT) (1,960,998)    
Service tax (ISSQN)    
Regulatory charges (173,428)    
Net operating revenues 6,652,824    
Electricity sales to final customers [member] | Residential [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 3,098,969    
Electricity sales to final customers [member] | Industrial [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 970,638    
Electricity sales to final customers [member] | Trade, services and other activities [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,701,260    
Electricity sales to final customers [member] | Rural [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 613,419    
Electricity sales to final customers [member] | Public entities [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 195,259    
Electricity sales to final customers [member] | Public lighting [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 233,558    
Electricity sales to final customers [member] | Public service [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 290,482    
Electricity sales to final customers [member] | Free consumers [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,729,603    
Electricity sales to final customers [member] | Donations and grants [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 691,709    
Electricity sales to final customers [member] | Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   10,481,794 10,104,045
Net operating revenues   6,426,016 5,548,584
Electricity sales to final customers [member] | Restated [Member] | Residential [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   3,336,432 3,175,290
Electricity sales to final customers [member] | Restated [Member] | Industrial [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,276,105 1,419,240
Electricity sales to final customers [member] | Restated [Member] | Trade, services and other activities [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   2,179,510 2,136,087
Electricity sales to final customers [member] | Restated [Member] | Rural [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   631,527 572,361
Electricity sales to final customers [member] | Restated [Member] | Public entities [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   279,495 262,705
Electricity sales to final customers [member] | Restated [Member] | Public lighting [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   274,250 278,645
Electricity sales to final customers [member] | Restated [Member] | Public service [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   332,414 316,307
Electricity sales to final customers [member] | Restated [Member] | Free consumers [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,431,274 1,179,314
Electricity sales to final customers [member] | Restated [Member] | Donations and grants [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   740,787 764,096
Electricity sales to distributors [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 4,330,982    
PIS/Pasep and Cofins (467,817)    
ICMS (VAT) (21,637)    
Service tax (ISSQN)    
Regulatory charges (61,698)    
Net operating revenues 3,779,830    
Electricity sales to distributors [member] | Bilateral contracts [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 2,386,929    
Electricity sales to distributors [member] | Regulated contracts [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 916,377    
Electricity sales to distributors [member] | Electric energy trade chamber CCEE [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 933,369    
Electricity sales to distributors [member] | Interest [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 94,307    
Electricity sales to distributors [member] | Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   3,301,336 3,136,244
Net operating revenues   2,865,866 2,765,916
Electricity sales to distributors [member] | Restated [Member] | Bilateral contracts [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,998,617 2,002,077
Electricity sales to distributors [member] | Restated [Member] | Regulated contracts [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   854,239 385,157
Electricity sales to distributors [member] | Restated [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] | Restated [Member] | Interest [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   91,404 85,986
Use of the main distribution and transmission grid [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 8,780,612    
PIS/Pasep and Cofins (667,419)    
ICMS (VAT) (2,118,380)    
Service tax (ISSQN)    
Regulatory charges (1,622,217)    
Net operating revenues 4,372,596    
Use of the main distribution and transmission grid [member] | Residential [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 2,788,725    
Use of the main distribution and transmission grid [member] | Industrial [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,273,320    
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 1,628,098    
Use of the main distribution and transmission grid [member] | Rural [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 548,682    
Use of the main distribution and transmission grid [member] | Public entities [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 180,814    
Use of the main distribution and transmission grid [member] | Public lighting [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 205,904    
Use of the main distribution and transmission grid [member] | Public service [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 195,597    
Use of the main distribution and transmission grid [member] | Free consumers [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,164,020    
Use of the main distribution and transmission grid [member] | Concessionaires and generators [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 61,720    
Use of the main distribution and transmission grid [member] | Operating and maintenance income - O&M and interest income [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 733,732    
Use of the main distribution and transmission grid [member] | Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   8,270,996 6,867,274
Net operating revenues   4,138,771 3,469,060
Use of the main distribution and transmission grid [member] | Restated [Member] | Residential [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   2,585,892 2,222,621
Use of the main distribution and transmission grid [member] | Restated [Member] | Industrial [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,280,168 1,110,089
Use of the main distribution and transmission grid [member] | Restated [Member] | Trade, services and other activities [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,713,632 1,407,156
Use of the main distribution and transmission grid [member] | Restated [Member] | Rural [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   467,044 362,778
Use of the main distribution and transmission grid [member] | Restated [Member] | Public entities [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   217,027 185,383
Use of the main distribution and transmission grid [member] | Restated [Member] | Public lighting [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   206,492 184,530
Use of the main distribution and transmission grid [member] | Restated [Member] | Public service [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   174,414 141,556
Use of the main distribution and transmission grid [member] | Restated [Member] | Free consumers [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,052,535 795,105
Use of the main distribution and transmission grid [member] | Restated [Member] | Concessionaires and generators [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   62,414 80,329
Use of the main distribution and transmission grid [member] | Restated [Member] | Operating and maintenance income - O&M and interest income [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   511,378 377,727
Construction income [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,414,067    
PIS/Pasep and Cofins    
ICMS (VAT)    
Service tax (ISSQN)    
Regulatory charges    
Net operating revenues 1,414,067    
Construction income [member] | Power distribution service concession [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 1,154,488    
Construction income [member] | Power gas distribution service concession [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 7,438    
Construction income [member] | Power Transmission Concession [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues [1] 252,141    
Construction income [member] | Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,132,884 1,097,313
Net operating revenues   1,132,884 1,097,313
Construction income [member] | Restated [Member] | Power distribution service concession [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   904,023 741,855
Construction income [member] | Restated [Member] | Power gas distribution service concession [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   12,153 13,478
Construction income [member] | Restated [Member] | Power Transmission Concession [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues [1]   216,708 341,980
Fair value of assets from the indemnity for the concession [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 57,341    
PIS/Pasep and Cofins    
ICMS (VAT)    
Service tax (ISSQN)    
Regulatory charges    
Net operating revenues 57,341    
Fair value of assets from the indemnity for the concession [member] | Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   36,646 47,499
Net operating revenues   36,646 47,499
Distribution of piped gas [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 679,304    
PIS/Pasep and Cofins (60,774)    
ICMS (VAT) (115,640)    
Service tax (ISSQN) (235)    
Regulatory charges    
Net operating revenues 502,655    
Distribution of piped gas [member] | Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   1,003,790 753,222
Net operating revenues   843,183 557,186
Sectorial financial assets and liabilities result [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 746,052    
PIS/Pasep and Cofins (69,113)    
ICMS (VAT)    
Service tax (ISSQN)    
Regulatory charges    
Net operating revenues 676,939    
Sectorial financial assets and liabilities result [member] | Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   25,057 985,344
Net operating revenues   18,631 893,688
Other operating revenue [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 406,539    
PIS/Pasep and Cofins (35,771)    
ICMS (VAT) (65)    
Service tax (ISSQN) (4,269)    
Regulatory charges    
Net operating revenues 366,434    
Other operating revenue [member] | Leasing and rent [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 176,452    
Other operating revenue [member] | Fair value in the purchase and sale of power in the active market [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 137,463    
Other operating revenue [member] | Income from rendering of services [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues 44,182    
Other operating revenue [member] | Other income [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues R$ 48,442    
Other operating revenue [member] | Restated [Member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   438,876 199,788
Net operating revenues   407,248 171,218
Other operating revenue [member] | Restated [Member] | Leasing and rent [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   141,315 130,007
Other operating revenue [member] | Restated [Member] | Fair value in the purchase and sale of power in the active market [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   204,876
Other operating revenue [member] | Restated [Member] | Income from rendering of services [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   51,780 39,705
Other operating revenue [member] | Restated [Member] | Other income [member]      
Disclosure of net operating revenue [line items]      
Gross operating revenues   R$ 40,905 R$ 30,076
[1] The balance contains the amount of construction revenue, the construction margin and the efficiency gain or loss as detailed in Note 11.3