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32. Events after the reporting period (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
Events After Reporting Period Details  
Final Regulatory Remuneration Base R$ 38,400,000
WACC 8.11%
Factor X 0.9287%
P0 R$ 3.8207/m3
Tariff Repositioning Index (IRT) 4.7744%