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Revenue - Schedule of Net Operating Revenue (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue [abstract]      
Revenue from supply of energy (a) R$ 31,671 R$ 30,158 R$ 29,619
Revenue from use of the electricity distribution systems (TUSD) 4,417 3,685 3,448
CVA and Other financial components (b) [1],[2] (213) (1,147) 2,146
Reimbursement of PIS/Pasep and Cofins over ICMS credits to customers- realization (1) [3] 1,909 2,360 1,317
Transmission revenue      
Transmission operation and maintenance revenue (c) 373 413 355
Transmission construction revenue (c) 242 407 252
Interest revenue arising from the financing component in the transmission contract asset (c) (Note 15) 524 575 660
Generation indemnity revenue (Note 14.1) 93 47  
Distribution construction revenue 3,899 3,246 1,852
Adjustment to expectation of cash flow from indemnifiable financial assets of distribution concession 149 39 54
Revenue on financial updating of the Concession Grant Fee (e) 412 467 523
Transactions in energy on the CCEE (f) 146 183 1,157
Mechanism for the sale of surplus (g) (4) 453 453
Supply of gas 4,139 4,529 3,470
Fine for violation of service continuity indicator (139) (94) (70)
Advances for services provided     154
PIS/Pasep and Cofins credits to be refunded to consumers [4] 0 (830)  
Other operating revenues (h) 2,316 2,658 1,935
Deductions on revenue (i) (13,084) (12,686) (13,679)
Net revenue R$ 36,850 R$ 34,463 R$ 33,646
[1] As per GREG/MME Resolution 3, the effect of the water scarcity tariff ‘Flag’, which was in force until April 2022, resulted in a significant reduction of revenue in 2022. Due to the better hydrological conditions, the tariff flag was ‘green’ as from May 2022, and produced no effect in the whole of 2023.
[2] This income derives from the total additions and amortizations shown in note 13.d.
[3] More information in note 18.
[4] This is the result of recognition of the effects of Law 14.385/22, which ordered that the amounts of credits of PIS, Pasep and Cofins wrongly charged on the ICMS tax component of electricity bills should be reimbursed in their entirety to the customers of electricity distributors.