The most popular technique for obtaining microalgae produced autotrophically is centrifugation, yet because of its high energy requirements, it is costly. In an attempt to lower these expenses, we experimented with electrocoagulation for harvesting of microalgae Chlorella vulgaris. The electro-coagulation-flocculation (ECF) was applicate in this work using aluminum and iron electrodes. During extensive lab-scale, experiments were studied to achieve a harvesting efficiency biomass: electric charge, inter-electrode distance, pH variation, cell assembly mode, stirring speed. Aluminum electrodes provided the best energy-efficient conditions for Chlorella vulgaris harvesting and 20 min electrolysis with current density of 6 mA/m2, stirring speed 400 rpm and an inter-electrode distance of 1 cm. Using electrocoagulation indicates that energy consumption is of 0.03 kWh/m3 for an efficiency of 98%. This consumption is very energy-efficient compared to the centrifugation method, which has an energy demand of 0.7 to 1.3 kWh per cubic meter of microalgae suspension. Our findings demonstrate that electrocoagulation is a practical and affordable technique for microalgae harvesting.