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Schedule of operating costs and expenses (Details) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Costs And Expenses |  |  |  |
Personnel (a) |  | R$ 1,240 | R$ 1,276 | R$ 1,272
Employees’ and managers’ profit sharing |  | 134 | 142 | 263
Post-employment benefits (reversals) – Note 24 | [1] | (16) | (438) | (408)
Materials |  | 94 | 79 | 91
Outsourced services (b) |  | 1,450 | 1,265 | 1,239
Energy purchased for resale (c) |  | 16,101 | 12,111 | 11,286
Depreciation and amortization | [2] | 1,049 | 989 | 958
Operating provisions and adjustments for operating losses (d) |  | 375 | 423 | 2,401
Charges for use of the national grid |  | 3,337 | 1,748 | 1,426
Gas bought for resale |  | 2,011 | 1,083 | 1,436
Construction costs (e) |  | 2,036 | 1,581 | 1,200
Other operating expenses, net (f) |  | (394) | (297) | (494)
Operating costs and expenses |  | R$ 28,237 | R$ 21,432 | R$ 22,474
[1] | Due to the changes made in the Collective Work Agreement for 2021–23, for offer and payment of life insurance for the employees and former employees, the Company believes that the post-retirement benefit in question had been canceled, in its entirety, and as a result wrote down the balance of the obligation. More information, see Note 24.
[2] | Net of PIS/Pasep and Cofins taxes applicable to amortization of the right-of-use assets in the amount of R$2.

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