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OBLIGATIONS OF LAW No. 14,182/2021 - Movements (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
OBLIGATIONS OF LAW No. 14,182/2021    
Opening balance at beginning R$ 39,519,406 R$ 36,659,454
Effect on cash flow:    
Amortization of Principal (1,974,966) (1,433,738)
Interest paid (239,131) (70,215)
Non-cash effect:    
Inflation adjustment 1,892,762 1,716,154
Charges 2,824,052 2,647,751
Opening balance at end 42,022,123 39,519,406
Current 2,916,199 2,161,176
Non-current 39,105,924 37,358,230
Energy Development Account    
OBLIGATIONS OF LAW No. 14,182/2021    
Opening balance at beginning 32,811,606 29,755,493
Effect on cash flow:    
Amortization of Principal (1,128,076) (583,626)
Interest paid (161,849) (36,976)
Non-cash effect:    
Inflation adjustment 1,604,681 1,384,394
Charges 2,484,198 2,292,321
Opening balance at end 35,610,560 32,811,606
Current 1,951,819 1,241,242
Non-current 33,658,741 31,570,364
River Basin Revitalization    
OBLIGATIONS OF LAW No. 14,182/2021    
Opening balance at beginning 6,707,800 6,903,961
Effect on cash flow:    
Amortization of Principal (846,890) (850,112)
Interest paid (77,282) (33,239)
Non-cash effect:    
Inflation adjustment 288,081 331,760
Charges 339,854 355,430
Opening balance at end 6,411,563 6,707,800
Current 964,380 919,934
Non-current R$ 5,447,183 R$ 5,787,866