The investigation of Savonius turbine performance for harvesting electrical energy in vertical wastewater pipes is still left behind compared to another Savonius wind turbine utilization. However, there is still a vast space to research it. This research investigates explicitly the effect of additional stages that combine with shift angle variations on the Savonius rotor. The Savonius housing turbine is mounted on a 3 inches pipe with 2.6 m of the head. This paper contains the data from turbine performance such as power, Coefficient of power (Cp), and Tip Speed Ratio (TSR) from those specimens. The highest Cp is 0.023. It is produced by double stage Savonius rotor with a shift angle of 90°. The highest Cp produces at 23.63 x 10−3 m3/s of water discharge. Meanwhile, the Savonius conventional design only produced 0.014 Cp at the same water discharge. Thus, the addition of a stage and variation of shift angle can increase the performance of the Savonius turbine.

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