Rectiformers are used for supplying power to different field of ESP (electrostatic precipitator). Applications range from electrostatic precipitator to electrostatic coating and inkjet printing. In addition, other treatment systems also used are electrostatic precipitator and bag filters. It also supplies high and low pressure pulse jet fabric filters, and electrostatic precipitator de-dusters. Post combustion, the mixture of flue gases and ash passes over an Electrostatic Precipitator (ESP). For combined removal of liquid droplets and particulates, a wet electrostatic precipitator is used. A noted product of the unit is an electrostatic precipitator used in energy generation facilities. In 2004, Vectren replaced an existing electrostatic precipitator at Unit 1 with a fabric filter.