Steam power plants use coal as fuel. The combustion of coal produces heat that is used in a boiler to increase the temperature and pressure of water, turning it into steam. The high-pressure steam then drives a turbine, which spins a shaft connected to an electric generator to produce electricity. There are two main types of steam power plants: captive plants that produce power for on-site industrial use, and central plants that generate electricity for the electric grid. The key components of a steam power plant include the boiler, turbine, condenser, cooling towers, and electrical equipment. Electrostatic precipitators are particulate collection devices commonly used in industries to minimize air pollution by using electrostatic attraction to efficiently collect particles of varying sizes.