Pietersaari on the west coast of Finland hosts what is believed to be the world largest dry biomass fired cogeneration plant. The plant, operated by Alhomens Kraft AB, has a capacity of 240 MW of electrical power, 100 MW process steam, and 60 MW district heating. It burns biofuels such as bark, sawdust, wood chips, and cut peat, along with 10% coal or oil. Commercial operation of the unit began in December 2001.