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Basis of Preparation (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
STATEMENTS OF INCOME      
NET OPERATING REVENUE R$ 21,479,468 R$ 20,535,341 R$ 20,976,216
GROSS PROFIT 4,898,040 4,929,757 4,268,308
Other operational income (expenses) (280,460) (739,635) (220,835)
Profit before financial results and taxes 2,489,724 942,888 4,580,425
Operating profit (1,203,326) (1,980,985) 658,482
Income tax and social contribution 5,080    
Net income 2,325,344    
Attributed to non-controlling interest 68,358 37,314 96,029
STATEMENTS OF COMPREHENSIVE INCOME      
Total comprehensive income 2,072,843 1,359,308 5,201,347
STATEMENTS OF CASH FLOWS      
Cash flow from operational activities 3,518,476 3,902,649 3,386,832
Taxes and charges paid 294,676 124,381 745,150
Cash flow from investment activities (3,135,091) (2,774,996) 31,908
Cash flow from financing activities 2,696,572 (1,922,041) (2,884,427)
Hydrological risk renegotiation - GSF (1,570,543)
Previously stated [member]      
STATEMENTS OF INCOME      
NET OPERATING REVENUE   21,927,721 23,984,287
Operating costs   (16,928,407) (19,119,637)
GROSS PROFIT   4,999,314 4,864,650
Selling expenses   (186,740) (194,998)
General and administrative expenses   (803,721) (924,561)
Other operational income (expenses)   (1,571,194) (235,910)
Equity in earnings of investees   478,577 366,314
Profit before financial results and taxes   2,916,236 5,446,038
Financial results   (1,966,037) (327,361)
Operating profit   950,199 5,118,677
Income tax and social contribution   199,122 (1,259,632)
Net income for the period - continuing operations   1,149,321 3,859,045
Result of discontinued operations   1,189,557
Net income   1,149,321 5,048,602
Attributed to controlling shareholders   1,112,007 4,952,573
Attributed to non-controlling interest   37,314 96,029
STATEMENTS OF COMPREHENSIVE INCOME      
Total comprehensive income, net of taxes   209,987 152,745
Total comprehensive income   1,359,308 5,201,347
Attributed to controlling shareholders   1,319,273 5,105,174
Attributed to non-controlling interest   40,035 96,173
STATEMENTS OF CASH FLOWS      
Cash flow from operational activities   3,902,649 3,386,832
Net income   1,149,321 3,859,045
Profit adjustments   2,293,118 (1,979,865)
Changes in assets and liabilities   1,883,234 2,675,188
Taxes and charges paid   (1,423,024) (1,203,156)
Equity in earnings of investees   35,620
Cash flow from investment activities   (2,774,996) 31,908
Property, plant and equipment and intangible assets   (2,880,829) (1,825,468)
Other activities   105,833 (586,976)
Discontinued operations   2,444,352
Cash flow from financing activities   (1,922,041) (2,884,427)
Issue of Debentures   305,928 1,043,011
Loan and lease payments   (60,200) (51,270)
Other activities   (2,167,769) (3,874,318)
Discontinued operations   (1,850)
Total effects on cash and cash equivalents   (794,388) 534,313
Hydrological risk renegotiation - GSF     1,570,543
Adjustments [Member]      
STATEMENTS OF INCOME      
NET OPERATING REVENUE   (1,392,380) (3,008,071)
Operating costs   1,322,823 2,411,729
GROSS PROFIT   (69,557) (596,342)
Selling expenses   11,071 8,316
General and administrative expenses   70,026 53,703
Other operational income (expenses)   20,996 15,075
Equity in earnings of investees  
Profit before financial results and taxes   32,536 (519,248)
Financial results   (39,847) (19,004)
Operating profit   (7,311) (538,252)
Income tax and social contribution   81,977 81,108
Net income for the period - continuing operations   74,666 (457,144)
Result of discontinued operations   (74,666) 457,144
Net income  
Attributed to controlling shareholders  
Attributed to non-controlling interest  
STATEMENTS OF COMPREHENSIVE INCOME      
Total comprehensive income, net of taxes  
Total comprehensive income  
Attributed to controlling shareholders  
Attributed to non-controlling interest  
STATEMENTS OF CASH FLOWS      
Cash flow from operational activities  
Net income   74,666 (457,144)
Profit adjustments   (306,736) 150,773
Changes in assets and liabilities   2,709 (101,830)
Taxes and charges paid   51,534 (84,074)
Equity in earnings of investees   177,827 492,275
Cash flow from investment activities  
Property, plant and equipment and intangible assets   580,969 14,277
Other activities   (22,967) 14,846
Discontinued operations   (558,002) (29,123)
Cash flow from financing activities  
Issue of Debentures   20,239
Loan and lease payments   2,988 2,485
Other activities   26,755
Discontinued operations   (2,988) (49,479)
Total effects on cash and cash equivalents  
Hydrological risk renegotiation - GSF    
Restateds [Member]      
STATEMENTS OF INCOME      
NET OPERATING REVENUE   20,535,341 20,976,216
Operating costs   (15,605,584) (16,707,908)
GROSS PROFIT   4,929,757 4,268,308
Selling expenses   (175,669) (186,682)
General and administrative expenses   (733,695) (870,858)
Other operational income (expenses)   (1,550,198) (220,835)
Equity in earnings of investees   478,577 366,314
Profit before financial results and taxes   2,948,772 4,926,790
Financial results   (2,005,884) (346,365)
Operating profit   942,888 4,580,425
Income tax and social contribution   281,099 (1,178,524)
Net income for the period - continuing operations   1,223,987 3,401,901
Result of discontinued operations   (74,666) 1,646,701
Net income   1,149,321 5,048,602
Attributed to controlling shareholders   1,112,007 4,952,573
Attributed to non-controlling interest   37,314 96,029
STATEMENTS OF COMPREHENSIVE INCOME      
Total comprehensive income, net of taxes   209,987 152,745
Total comprehensive income   1,359,308 5,201,347
Attributed to controlling shareholders   1,319,273 5,105,174
Attributed to non-controlling interest   40,035 96,173
STATEMENTS OF CASH FLOWS      
Cash flow from operational activities   3,902,649 3,386,832
Net income   1,223,987 3,401,901
Profit adjustments   1,986,382 (1,829,092)
Changes in assets and liabilities   1,885,943 2,573,358
Taxes and charges paid   (1,371,490) (1,287,230)
Equity in earnings of investees   177,827 527,895
Cash flow from investment activities   (2,774,996) 31,908
Property, plant and equipment and intangible assets   (2,299,860) (1,811,191)
Other activities   82,866 (572,130)
Discontinued operations   (558,002) 2,415,229
Cash flow from financing activities   (1,922,041) (2,884,427)
Issue of Debentures   305,928 1,063,250
Loan and lease payments   (57,212) (48,785)
Other activities   (2,167,769) (3,847,563)
Discontinued operations   (2,988) (51,329)
Total effects on cash and cash equivalents   R$ (794,388) 534,313
Hydrological risk renegotiation - GSF     R$ 1,570,543