The method of electrical discharge of water purification is a complex chemical-technological process. Under the influence of electrical discharges in the water purification plant, chemical processes such as the oxidation of the electroerosion products and precipitation of harmful impurities occurs due to iron oxides and hydroxides. The aim of this study is development of a control system for electrical discharge of water purification plant. The Model Predictive Control technique is selected. The developed control system allows reducing the energy costs for the process of water purification.