Electrostatic Precipitator (ESP) is a system of equipment installed in Coal fire power plant, to reduce particulate emission in a flue gas before the gas being release to the atmosphere. An ESP is a type of filtration device that charges and sequentially precipitates particles to the flat metallic dust collectors by using strong electric field.

ESP is one of the most important equipment in the coal fired power plant. The main purpose of the ESP is to reduce the particulate matter (PM) emission. PM stands for particulate matter (also called particle pollution): the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye. Others are so small they can only be detected using an electron microscope.

Particle pollution includes:

• PM₁₀ : inhalable particles, with diameters that are generally 10 micrometers and smaller
• PM₅: fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller