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26. Operating revenue (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Revenue Details 1 |  |  |
Sanitation services | R$ 12,223,746 | R$ 11,122,232 | R$ 8,946,825
Construction revenue | 3,150,877 | 3,732,877 | 3,336,716
Sales Tax | (757,619) | (756,901) | (571,972)
Regulation, Control and Oversight Fee (TRCF) | (8,771) | 0 | 0
Net operating revenue | R$ 14,608,233 | R$ 14,098,208 | R$ 11,711,569

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