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Research and Development and Energy Efficiency (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of balances recognized for investment in research and development
Schedule of balances recognized for investment in research and development          
Consolidated Disbursed and not completed Balance to be collected Balance to disburse Balance as of Balance as of
  12.31.2023 12.31.2022
Research and Development - R&D          
FNDCT                                             -                    5,781                          -                 5,781                 6,588
MME                                             -                    2,891                          -                 2,891                 3,314
R&D                                  153,048                    1,359                 47,464             201,871             260,243
                                   153,048                  10,031                 47,464             210,543             270,145
Energy efficiency program  - EEP        
Procel                                             -                  23,613                          -               23,613               11,960
EEP                                  139,610                  10,822               169,086             319,518             332,653
                                   139,610                  34,435               169,086             343,131             344,613
                                   292,658                  44,466               216,550             553,674             614,758
      Current             320,196             370,244
      Noncurrent 233,478 244,514
National Fund for Scientific and Technological Development - FNDCT      
National Program of Electricity Conservation - Procel        
Schedule of changes in R&D and EEP balances
Schedule of changes in R&D and EEP balances            
Consolidated FNDCT  MME  R&D  Procel  EEP  Total 
Balance as of January 1, 2022            7,584            3,790        286,029          19,883        309,811        627,097
Additions          39,044          19,535          39,070          11,298          45,191        154,138
Performance agreement                    -                    -                    -                    -            2,552            2,552
Interest rate (Note 32)                    -                    -            6,197            3,799          24,648          34,644
Transfers                    -                    -                    -          (3,685)            3,685                    -
Payments        (40,040)        (20,011)          (8,061)        (19,335)        (29,740)       (117,187)
Concluded projects                    -                    -        (62,992)                    -        (23,494)         (86,486)
Balance as of December 31, 2022            6,588            3,314        260,243          11,960        332,653        614,758
Additions          40,011          20,004          40,019          12,200          48,805        161,039
Performance agreement                    -                    -                    -                    -            4,420            4,420
Interest rate (Note 32)                    -                    -            5,930             (547)          21,618          27,001
Transfers (b)            5,802            2,900            1,739                    -                    -          10,441
Payments        (46,620)        (23,327)          (9,695)                    -        (16,450)         (96,092)
Concluded projects                    -                    -        (87,675)                    -        (71,528)       (159,203)
Reclassification (a)                     -                    -          (8,690)                    -                    -           (8,690)
Balance as of December 31, 2023            5,781            2,891        201,871          23,613        319,518        553,674
(a)Reclassification to Liabilities classified as held for sale (Note 39).
(b)Transfers to assets - Law No. 14,514/2023