Saturated low to medium pressure steam at a pressure of approximately 20 to 150 PSIG is required and added to the gasifier for bed fluidization. A natural mineral bed material (the exact composition has not been disclosed) is also added with the biomass to form the fluidized bed. Note that oxygen is not added to the gasifier reactor because the gasification reactions are driven by indirect heating. Oxygen via air is however added to the combustion reactor to produce the necessary heat which is transferred to the bed material.