A mixture of carbon monoxide and nitrogen used in a gasification process and formed by the partial combustion of coal, coke, or anthracite in a blast of air. The exothermic reaction produces carbon monoxide:

Nitrogen in the air remains unchanged in the process. Adding steam to the gasification process results in a gas mixture also containing hydrogen. Producer gas is used as a fuel gas in furnaces and the generation of power in gas turbines. A producer process is a generic name for processes that convert solid fuels into gaseous fuels.