The voltage deviation is one of the major problems in power supply systems of industrial enterprises. Its solution is a priority task in the design of power supply systems. The ways of improving the efficiency of food production by reducing process losses caused by defective voltage are studied. The way to improve voltage quality is suggested. Reducing power quality is evident in the growth of power and energy losses, reducing of equipment lifecycle, technological losses, which include reducing goods production, lowering product quality, and output of low-quality products. Technological losses make up to 90 ... 92% of all losses and are usually hidden in the cost of production. Power engineering specialist conceal the matter, technologists typically do not know the causes of tecnological losses.