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Consolidated Statements of Income - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Profit or loss [abstract]      
NET OPERATING REVENUE R$ 21,479,468 R$ 20,535,341 R$ 20,976,216
Operating costs (16,581,428) (15,605,584) (16,707,908)
GROSS OPERATING PROFIT 4,898,040 4,929,757 4,268,308
Other operational expenses / income      
 Selling expenses  (152,638) (175,669) (186,682)
 General and administrative expenses  (1,078,037) (733,695) (870,858)
 Hydrological risk renegotiation - GSF  1,570,543
 Other operational income (expenses), net  (280,460) (739,635) (220,835)
 Provision for allocation of PIS and Cofins credits  (810,563)
 Equity in earnings of investees  307,809 478,577 366,314
Total other operational expenses / income  (1,203,326) (1,980,985) 658,482
PROFIT BEFORE FINANCIAL RESULTS AND TAXES 3,694,714 2,948,772 4,926,790
Financial results      
 Financial income  1,069,116 956,413 901,605
 Financial expenses  (2,274,106) (1,950,927) (1,247,970)
 Restatement of provision for allocation of PIS and Cofins credits  (1,011,370)  
Total financial results (1,204,990) (2,005,884) (346,365)
OPERATING PROFIT  2,489,724 942,888 4,580,425
INCOME TAX AND SOCIAL CONTRIBUTION      
 Current  (371,104) (368,035) (372,180)
 Deferred  17,047 649,134 (806,344)
TOTAL INCOME TAX AND SOCIAL CONTRIBUTION (354,057) 281,099 (1,178,524)
 NET INCOME FROM CONTINUING OPERATIONS 2,135,667 1,223,987 3,401,901
DISCONTINUED OPERATIONS      
 Net income (loss) from discontinued operations  191,501 (74,666) 1,646,701
NET INCOME 2,327,168 1,149,321 5,048,602
 Attributed to shareholders of the parent company resulting from continuing operations  2,158,077 1,237,819 3,441,885
 Attributed to shareholders of the parent company due to discontinued operations  100,733 (125,812) 1,510,688
 Attributed to non-controlling shareholders resulting from continuing operations  873 (207) (16,331)
 Attributed to non-controlling shareholders due to discontinued operations  R$ 67,485 R$ 37,521 R$ 112,360