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Basis of Preparation (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of restatement of comparative balances
     
       
12.31.2022 As previously stated Adjustments Restated
STATEMENTS OF INCOME      
NET OPERATING REVENUE 21,927,721 (1,392,380) 20,535,341
Operating costs  (16,928,407)   1,322,823  (15,605,584)
GROSS PROFIT   4,999,314   (69,557)   4,929,757
Selling expenses (186,740)  11,071 (175,669)
General and administrative expenses (803,721)  70,026 (733,695)
Other operational income (expenses) (1,571,194)  20,996 (1,550,198)
Equity in earnings of investees   478,577  -   478,577
Profit before financial results and taxes   2,916,236  32,536   2,948,772
Financial results (1,966,037)   (39,847) (2,005,884)
Operating profit   950,199  (7,311)   942,888
Income tax and social contribution   199,122  81,977   281,099
Net income for the period - continuing operations   1,149,321  74,666   1,223,987
Result of discontinued operations  -   (74,666)   (74,666)
Net income   1,149,321  -   1,149,321
Attributed to controlling shareholders   1,112,007  -   1,112,007
Attributed to non-controlling interest  37,314  -  37,314
STATEMENTS OF COMPREHENSIVE INCOME      
Total comprehensive income, net of taxes   209,987  -   209,987
Total comprehensive income   1,359,308  -   1,359,308
Attributed to controlling shareholders   1,319,273  -   1,319,273
Attributed to non-controlling interest  40,035  -  40,035
STATEMENTS OF CASH FLOWS      
Cash flow from operational activities   3,902,649  -   3,902,649
Net income   1,149,321  74,666   1,223,987
Profit adjustments   2,293,118 (306,736)   1,986,382
Changes in assets and liabilities   1,883,234 2,709   1,885,943
Taxes and charges paid (1,423,024)  51,534 (1,371,490)
Equity in earnings of investees  -   177,827   177,827
Cash flow from investment activities (2,774,996)  - (2,774,996)
Property, plant and equipment and intangible assets (2,880,829)   580,969 (2,299,860)
Other activities   105,833   (22,967)  82,866
Discontinued operations  - (558,002) (558,002)
Cash flow from financing activities (1,922,041)  - (1,922,041)
Issue of Debentures   305,928  -   305,928
Loan and lease payments   (60,200) 2,988   (57,212)
Other activities (2,167,769)  - (2,167,769)
Discontinued operations  -  (2,988)  (2,988)
Total effects on cash and cash equivalents (794,388)  - (794,388)

 

       
       
12.31.2021 As previously stated Adjustments Restated
STATEMENTS OF INCOME      
NET OPERATING REVENUE 23,984,287 (3,008,071) 20,976,216
Operating costs  (19,119,637)   2,411,729  (16,707,908)
GROSS PROFIT   4,864,650 (596,342)   4,268,308
Selling expenses (194,998) 8,316 (186,682)
General and administrative expenses (924,561)  53,703 (870,858)
Hydrological risk renegotiation - GSF   1,570,543  -   1,570,543
Other operational income (expenses) (235,910)  15,075 (220,835)
Equity in earnings of investees   366,314  -   366,314
Profit before financial results and taxes   5,446,038 (519,248)   4,926,790
Financial results (327,361)   (19,004) (346,365)
Operating profit   5,118,677 (538,252)   4,580,425
Income tax and social contribution (1,259,632)  81,108 (1,178,524)
Net income for the period - continuing operations   3,859,045 (457,144)   3,401,901
Result of discontinued operations   1,189,557   457,144   1,646,701
Net income   5,048,602  -   5,048,602
Attributed to controlling shareholders   4,952,573  -   4,952,573
Attributed to non-controlling interest  96,029  -  96,029
STATEMENTS OF COMPREHENSIVE INCOME      
Total comprehensive income, net of taxes   152,745  -   152,745
Total comprehensive income   5,201,347  -   5,201,347
Attributed to controlling shareholders   5,105,174  -   5,105,174
Attributed to non-controlling interest  96,173  -  96,173
STATEMENTS OF CASH FLOWS      
Cash flow from operational activities   3,386,832  -   3,386,832
Net income   3,859,045 (457,144)   3,401,901
Profit adjustments (1,979,865)   150,773 (1,829,092)
Changes in assets and liabilities   2,675,188 (101,830)   2,573,358
Taxes and charges paid (1,203,156)   (84,074) (1,287,230)
Equity in earnings of investees  35,620   492,275   527,895
Cash flow from investment activities  31,908  -  31,908
Property, plant and equipment and intangible assets (1,825,468)  14,277 (1,811,191)
Other activities (586,976)  14,846 (572,130)
Discontinued operations   2,444,352   (29,123)   2,415,229
Cash flow from financing activities (2,884,427)  - (2,884,427)
Issue of Debentures   1,043,011  20,239   1,063,250
Loan and lease payments   (51,270) 2,485   (48,785)
Other activities (3,874,318)  26,755 (3,847,563)
Discontinued operations  (1,850)   (49,479)   (51,329)
Total effects on cash and cash equivalents   534,313  -   534,313