An electrostatic precipitator is a device that captures particulates from a gas stream. Maximum effectiveness of the system occurs when the voltage supply output reaches the sparking threshold. Variation in gas volume, dust loading and other factors, however affect the sparking threshold level of the electrostatic precipitator. Employing an advanced electrical control system, an automatic control circuit regulates each high voltage power supply output for maximum electrostatic precipitator efficiency regardless of process variation. Sparking causes the power supply to notch down slightly with the automatic controls bringing it right back up to sparking potential. Modern digital electronic controls automate this process and assure operation is at its peak performance levels at all times on the electrostatic precipitator.