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Net Operating Revenue (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Gross operating revenues R$ 32,198,639    
(-) Pis/Pasep and Cofins (2,648,382)    
(-) ICMS (VAT) (3,945,668)    
(-) Service tax (ISSQN) (6,414)    
Electricity Sales To Final Customers [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 11,392,957 R$ 12,296,456 R$ 9,524,897
(-) Pis/Pasep and Cofins (865,989)    
(-) ICMS (VAT) (2,042,838)    
(-) Service tax (ISSQN)    
Residential [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 3,441,726 4,098,156 3,098,969
Industrial [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 954,280 1,230,945 970,638
Trade Services And Other Activities [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,930,820 2,202,475 1,701,260
Rural [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 768,128 873,560 613,419
Public Entities [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 262,000 276,383 195,259
Public Lighting [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 253,758 339,524 233,558
Public Service [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 351,613 400,341 290,482
Free Consumers [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,692,303 2,203,320 1,729,603
Donations And Grants [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 738,329 671,752 691,709
Electricity Sales To Distributors [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 4,644,150 7,034,152 4,330,982
(-) Pis/Pasep and Cofins (650,271)    
(-) ICMS (VAT) (18,876)    
(-) Service tax (ISSQN)    
Bilateral Contracts [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,923,509 2,390,859 2,386,929
Regulated Contracts [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,033,405 1,026,124 916,377
Electric Energy Trade Chamber C C E E [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 568,797 3,482,687 933,369
Effective Interest Grant Bonus [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 118,439 134,482 94,307
Use Of The Main Distribution And Transmission Grid [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 9,843,657 10,088,231 8,780,612
(-) Pis/Pasep and Cofins (784,691)    
(-) ICMS (VAT) (1,595,850)    
(-) Service tax (ISSQN)    
Residential One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,899,387 3,011,507 2,788,725
Industrial One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,174,082 1,456,377 1,273,320
Trade Services And Other Activities One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,735,174 1,771,496 1,628,098
Rural One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 662,963 623,280 548,682
Public Entities One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 231,753 205,247 180,814
Public Lighting One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 195,319 213,433 205,904
Public Service One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 218,738 214,501 195,597
Free Consumers One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,819,152 1,440,922 1,164,020
Concessionaires And Generators One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 86,160 79,493 61,720
Operating And Maintenance Income O And M And Interest Income One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 820,929 1,071,975 733,732
Construction Income [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,176,158 1,951,559 1,414,067
(-) Pis/Pasep and Cofins    
(-) ICMS (VAT)    
(-) Service tax (ISSQN)    
Power Distribution Service Concession [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 2,048,022 1,700,889 1,154,488
Power Gas Distribution Service Concession [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 12,024 11,222 7,438
Power Transmission Concession [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues [1] 116,112 239,448 252,141
Fair Value Of Assets From The Indemnity For The Concession [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 89,941 142,642 57,341
(-) Pis/Pasep and Cofins    
(-) ICMS (VAT)    
(-) Service tax (ISSQN)    
Distribution Of Piped Gas [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,669,588 950,850 679,304
Sectorial Financial Assets And Liabilities Result 1 [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 1,847,863 2,502,324 746,052
Other Operating Revenue One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 534,325 358,997 406,539
Leasing And Rent [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 374,801 253,049 176,452
Fair Value In The Purchase And Sale Of Power [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 32,747 137,463
Income From Rendering Of Services [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 59,048 91,932 44,182
Other Income One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 67,729 14,016 48,442
Gross Operating Revenue One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues 32,198,639 35,325,211 25,939,794
Pis Pasep And Cofins One [Member]      
IfrsStatementLineItems [Line Items]      
(-) Pis/Pasep and Cofins (2,648,382) (2,839,713) (2,038,541)
Recovery Of Pis Pasep And Cofins On I C M S [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues    
(-) Pis/Pasep and Cofins    
Recovery of Pis/Pasep and Cofins on ICMS 810,563
(-) ICMS (VAT)    
(-) Service tax (ISSQN)    
I C M S V A T [Member]      
IfrsStatementLineItems [Line Items]      
(-) ICMS (VAT) (3,945,668) (4,984,945) (4,216,720)
Service Tax I S S Q N [Member]      
IfrsStatementLineItems [Line Items]      
(-) Service tax (ISSQN) (6,414) (7,509) (4,504)
Sectorial Charges One [Member]      
IfrsStatementLineItems [Line Items]      
(-) Sectorial charges (3,670,454) (3,508,757) (1,857,343)
Net Operating Revenue One [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenues R$ 21,927,721 R$ 23,984,287 R$ 18,633,249
[1] The balance contains the amount of construction revenue, the construction margin and the efficiency gain or loss as detailed in Note 10.3.