**4. Environmental impacts**

Environmental impacts of power plants are mainly reflected in emissions of pollutants and greenhouse gases from fossil fuel‐based electricity generation. For instance, electricity generation is the fourth highest combined source of NOx , carbon monoxide and particulate mvatter in the United States [11]. The combustion of coal for power generation produces fly ash, which must be collected prior to discharge to the atmosphere. Electrostatic precipitators are devices used for collecting of fly ash from smoke gases in power plants that use coil as a combustion fuel. The precipitator collection efficiency can be expected to exceed 99.5%. Most existing electrical pre‐ cipitators are developed with classical continual power supply that provides DC voltage at the end of electrodes. Improvement of this power supply type that has better purification and overall energy efficiency is obtained by the usage of intermittent supply [12].
