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Revenue - Schedule of Net Operating Revenue (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue      
Revenue from supply of energy (a) R$ 34,341 R$ 31,671 R$ 30,158
Revenue from use of the electricity distribution systems (TUSD) 5,134 4,417 3,685
CVA and Other financial components (1) 423 (213) (1,147)
Reimbursement of PIS/Pasep and Cofins over ICMS credits to customers- realization (note 19) 513 1,909 2,360
Transmission revenue (b)      
Operation and maintenance revenue 383 373 413
Transmission construction revenue (c) 425 242 407
Interest revenue arising from the financing component in the transmission contract asset (c) (Note 15) 433 524 575
Generation indemnity revenue (Note 14.1) 86 93 47
Distribution construction revenue 4,712 3,899 3,246
Adjustment to expectation of cash flow from indemnifiable financial assets of distribution concession 104 149 39
Revenue on financial updating of the Concession Grant Fee (e) 447 412 467
Transactions in energy on the CCEE 92 146 183
Mechanism for the sale of surplus 0 (4) 453
Supply of gas 3,919 4,139 4,529
Fine for violation of service continuity indicator (157) (139) (94)
PIS/Pasep and Cofins credits to be refunded to consumers 0 0 (830)
Other operating revenues (c) 2,906 2,316 2,658
Deductions on revenue (d) (13,941) (13,084) (12,686)
Revenue R$ 39,820 R$ 36,850 R$ 34,463