Voltage fluctuation is a critical problem in every industry, and its effects are very serious. Because of voltage fluctuation, your costly sophisticated equipments may get damaged.
If you are having different types of electronic cards, they may also get damaged resulting into erratic behavior or even stoppage of work due to voltage fluctuations.
Stabilizer stabilizes voltage and gives your equipment a stable supply within a tolerance of +/- 1 %
In the case of over voltage problem, stabilizer saves energy too for lighting loads.