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Schedule of net operating revenue (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Transmission revenue      
Net revenue R$ 33,646 R$ 25,228 R$ 25,486
Restated 1 [Member]      
IfrsStatementLineItems [Line Items]      
Revenue from supply of energy (a) 29,619 26,432 26,928
Revenue from use of the electricity distribution systems (TUSD) (b) 3,448 3,022 2,722
CVA, and Other financial components (c) 2,146 455 58
Reimbursement of  PIS/Pasep and Cofins over ICMS credits to customers– realization [1] 1,317 266
Transmission revenue      
   Transmission operation and maintenance revenue (d) 355 280 352
   Transmission construction revenue (d) (note 14) 252 201 312
   Interest revenue arising from the financing component in the transmission contract asset (d) (note 14) 660 438 328
Distribution construction revenue 1,852 1,436 980
Adjustment to expectation of cash flow from indemnifiable financial assets of distribution concession (e) 54 16 18
Revenue on financial updating of the Concession Grant Fee (f) 523 347 318
Energy transactions on the CCEE (g) 1,157 154 432
Mechanism for the sale of surplus (h) 453 234
Supply of gas 3,470 2,011 2,298
Fine for violation of service continuity indicator (70) (51) (58)
Advances for services provided (i) 154 1,428
Other operating revenues (j) 1,935 1,709 1,721
Deductions on revenue (k) (13,679) (11,722) (12,351)
Net revenue R$ 33,646 R$ 25,228 R$ 25,486
[1] For more information, see note 9a from these financial statements.