The mixture of gases produced by the gasification (BECGasification) of organic material such as biomass at relatively low temperatures (700 to 1000C). Producer gas is composed of carbon monoxide (CO) and hydrogen (H2) plus carbon dioxide (CO2) and typically a range of hydrocarbons such as methane (CH4). Producer gas can be burned as a fuel gas such as in a boiler for heat or in an internal combustion gas engine for electricity generation or CHP. The composition of the gas can be modified by choice of gasification parameters to be optimized as a fuel gas (producer gas) or synthesis gas which contains almost exclusively CO and H2 and is suitable for synthesis of liquid biofuels.