Electricity is the major & predominant source of energy in today’s perspective. With the advent of technology & increase in buying capacity of household’s, the usage of Heavy Electric Load’s such as Air Conditioner, Hooters, Washing Machines have seen a drastic rise. Also, unlike industrial loads are much heavier, they run in a fixed pattern & generally load is balanced across all three phases & are seldom non-linear. Also, proliferation of electronic equipment has increased the Non-Linear load such as SMPS, which have rectifier component in line, & introduction of Inverter Technology for Ac’s & Washing Machines, despite saving energy, has created severe concern of harmonic / high frequency noise introduction in Power System. The proposed system intends to implement a Shunt Active Power Filter using PI (Proportional Integral) Technique that can cater to power system harmonic & noise introduced by Non-Linear Load, Unbalanced Load & Mixed Load.