In the process of producing alagal bio-fuel, harvesting the biomass accounts for nearly 30 percent of the total production cost.Therefore, the economic feasibility of the microalage-to-energy process is dominated by suitable harvesting technique.Normally, The highly energy intensive centrifugation and filtration process are followed by flocculation for harvesting micro-algae.This case study underlines the basic principles in electrofloculation of fresh water and marine microalage. An experimental investigation was done on culturing and harvesting selected microalage species to understand the effect of current and voltage on the recovery efficiency and power consumption.