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Taxes (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of deferred income tax and social contribution
                   
Consolidated       Recognized         Recognized   
  Balance as of Recognized Other comprehensive Balance as of Recognized Other Reclassi- comprehensive Balance as of 
  January 1, 2022 in income (a) income December 31, 2022 in income (a) fication (b) income December 31, 2023
Noncurrent assets                    
Provision for allocation of PIS and Cofins credits   -  629,427   -   -   629,427  19,985 -   - -   649,412
Provisions for legal claims   502,873  132,175   -   -   635,048   (41,717)  4,643   (5,496) -   592,478
Post-employment benefits 429,121 22,724   - (88,548)   363,297  14,774 -   (2,466) 129,007   504,612
Fair value in the purchase and sale of power 185,460 65,700   -   -   251,160 5,060 -   - -   256,220
Impairment of assets 313,275  (17,486)   -   -   295,789   (73,376) -   (9,126) -   213,287
Voluntary retirement program   23,030  (22,551)   -   - 479   207,330 -   - -   207,809
Expected credit losses 151,149  (11,412)   -   -   139,737 1,852 -   (633) -   140,956
Tax losses and negative tax basis 121,802 73,260   -   -   195,062   (55,382)   (124) (36,271) -   103,285
Taxes with suspended liability   74,665   7,516   -   -  82,181 7,672 -   - -  89,853
Lease liability   55,659 19,124   -   -  74,783  (121) -   - -  74,662
Research and development and energy efficiency programs 138,849  (11,766)   -   -   127,083   (59,818) -   - -  67,265
Amortization - concession   52,429   5,220   -   -  57,649 5,220 -   - -  62,869
Provisions for performance and  profit sharing 115,871   (100,957)   -   -  14,914  35,889 -   - -  50,803
Concession contracts   19,769 (1,067)   -   -  18,702  (1,069) -   - -  17,633
Others 101,047 22,814   -   -   123,861 5,011 -   - -   128,872
  2,284,999  812,721   - (88,548)   3,009,172  71,310  4,519 (53,992) 129,007   3,160,016
(-) Noncurrent liabilities                    
Concession contracts 1,788,474 51,919 8,155   -   1,848,548 6,891 209,086 (38,064) -   2,026,461
Deemed cost of property, plant and equipment 326,497  (18,810)   -   -   307,687   (16,769) -   - -   290,918
Accelerated depreciation 102,324 25,832   -   -   128,156  18,382 -   - -   146,538
Fair value in the purchase and sale of power 290,964 76,834   -   -   367,798 6,775 -   - -   374,573
Escrow deposits monetary variation   65,119   7,708   -   -  72,827  12,063 -   - -  84,890
Right-of-use asset   54,980 16,897   -   -  71,877  (1,552) -   - -  70,325
Transaction cost on loans and financing and debentures   28,036   2,280   -   -  30,316  11,348 -   - -  41,664
Others   30,174 21,672   - 3,500  55,346  17,125 - (16,552) (2,167)  53,752
  2,686,568  184,332 8,155 3,500   2,882,555  54,263 209,086 (54,616) (2,167)   3,089,121
Net  (401,569)  628,389  (8,155) (92,048)   126,617  17,047  (204,567) 624 131,174  70,895
Assets presented in the Statement of Financial Position 963,259         1,644,299           1,757,688
Liabilities presented in the Statement of Financial Position  (1,364,828)       (1,517,682)         (1,686,793)
(a) Effects mainly of business combinations occurring in 2023 (Note 1.2) and 2022.
(b) Reclassification to Assets classified as held for sale (Note 39).
Schedule of projected realization of the deferred taxes
   
  Assets  Liabilities 
2024            1,011,652             (349,672)
2025               712,514             (326,304)
2026               200,526             (275,776)
2027               101,950             (231,884)
2028                 63,152             (198,029)
2029 to 2031               150,686             (489,463)
after 2031               919,536          (1,217,993)
             3,160,016          (3,089,121)
Schedule of other taxes recoverable and other tax obligations
   
  12.31.2023 12.31.2022
Current assets    
Recoverable ICMS (VAT)           158,010           128,288
Recoverable PIS/Pasep and Cofins taxes (a)           784,593        1,110,659
Other recoverable taxes                  740                  747
            943,343        1,239,694
Noncurrent assets    
Recoverable ICMS (VAT)           190,229           171,374
Recoverable PIS/Pasep and Cofins taxes (a)        1,982,826        2,421,176
Other recoverable taxes             83,101             34,743
         2,256,156        2,627,293
Current liabilities    
ICMS (VAT) payable  (Note 12.2.2)           194,734           149,506
ICMS installment payment (Note 12.2.3)             11,365             10,437
PIS/Pasep and Cofins payable             34,616             70,423
IRRF on interest on capital             31,200             11,372
Special Tax Regularization Program - Pert             62,420             57,046
Other taxes                 11,748               4,822
            346,083           303,606
Noncurrent liabilities    
Social security contributions - injunction on judicial deposit           264,868           242,248
ICMS installment payment (Note 12.2.3)             29,921             37,883
Special Tax Regularization Program - Pert           317,304           347,029
Other taxes                          -               6,331
            612,093           633,491
* Balances of assets and liabilities presented on a net basis, considering the Company's right and intention to realize the assets and liabilities on a net basis.
(a) The balance contains amounts referring Pis and Cofins credit on ICMS (Note 12.2.1)
Schedule of movement of the asset
   
Balance as of January 1, 2022              4,355,265
Monetary variation                  294,952
Offsetting with taxes payable            (1,165,601)
Balance as of December 31, 2022              3,484,616
Monetary variation                  256,492
Offsetting with taxes payable            (1,075,244)
Balance as of December 31, 2023              2,665,864
  Current               777,481
  Noncurrent            1,888,383
Schedule of movement of liabilities
   
Balance as of January 1, 2022              3,326,795
Monetary variation                  261,463
(-) Transfer to sectorial financial liabilities (Note 8)            (1,593,100)
Balance as of December 31, 2022              1,995,158
Monetary variation                  199,241
(-) Transfer to sectorial financial liabilities (Note 8)            (1,462,673)
Balance as of December 31, 2023                 731,726
  Current               558,591
  Noncurrent               173,135
Schedule of provision for allocation of Pis and Cofins credits
   
Balance as of January 1, 2022                            -
Provision for allocation of PIS and Cofins credits                 810,563
Monetary variation               1,011,370
Balance as of June 30, 2022              1,821,933
Monetary variation                    29,324
Balance as of December 31, 2022              1,851,257
Monetary variation                    58,518
Balance as of December 31, 2023              1,909,775
Schedule of reconciliation of provision for income tax and social contribution
     
    Restated Restated
  12.31.2023 12.31.2022 12.31.2021
Income before IRPJ and CSLL      2,489,724          942,888            4,580,425
(-) Equity in income       (307,808)        (478,577)              (366,315)
Income after IRPJ and CSLL      2,181,916          464,311            4,214,110
IRPJ and CSLL (34%)       (741,851)        (157,866)           (1,432,797)
Tax effects on:      
Interest on equity (JSCP)         325,720          329,800               223,380
Dividends                453                 250                      437
Non deductible expenses         (22,701)          (25,172)                (24,679)
Tax incentives             9,905            11,492                 40,011
Unrecognized tax loss and negative basis of CSLL         (24,345)          (29,870)                (29,002)
Difference between tax bases of deemed profit and taxable profit           18,844            35,677                 49,638
Effect of non taxable monetary variation (Selic) on undue tax payments           87,207          100,282 -
Others           (7,289)            16,506                  (5,512)
Current IRPJ and CSLL       (371,104)        (368,035)              (372,180)
Deferred IRPJ and CSLL            17,047          649,134              (806,344)
Effective rate - % 16.2% -60.5% 28.0%