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Biofuels made from compressed organic matter or biomass are known as pellet fuels (or pellets). Any one of the five main types of biomass—industrial waste and co-products, food waste, agricultural leftovers, energy crops, and untreated lumber—can be converted into pellets. The most popular kind of pellet fuel is wood, which is typically produced from compacted sawdust and other industrial wastes left over from building, furniture manufacturing, and timber milling. Empty fruit bunches, palm kernel shells, coconut shells, and tree tops and branches thrown during logging operations are some additional types of industrial trash. In order to be used in currently operating coal-fired power plants, so-called "black pellets" were manufactured from biomass and polished to resemble hard coal. The heating value, moisture and ash content, and size of pellets are used to classify them. They can be used as fuels for producing electricity, cooking, and heating in homes or businesses. ...