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The margin defined for each performance obligation from the transmission concession contract is as follows: (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Construction and upgrades revenue R$ 252 R$ 201 R$ 312 [1]
Construction and upgrades costs (183) (147) (220) [1]
Margin R$ 69 R$ 54 R$ 92 [1]
Mark-up (%) 37.40% 36.73% 41.82%
Operation and maintenance revenue R$ 355 R$ 279 R$ 352 [1]
Operation and maintenance cost (235) (223) (388) [1]
Margin R$ 120 R$ 56 R$ (36) [1]
Mark-up (%) 50.88% 25.11% 9.28%
[1] The negative margin observed in 2019 related to the performance obligation to operate and maintain is due the recognition of the non-recurring tax provision, in the amount of R$135.