NOVELTY - A gasification and fuel cell system (I) comprising a fluidized bed gasifier; a combustor; and a fuel cell where at least a portion of exhaust gas from the anode of the fuel cell is directed to the combustor, to recover residual energy and thus increase the efficiency of the system, is new.    USE - (I) is useful for producing energy from a biomass feedstock (claimed).    ADVANTAGE - The novel system directs a portion of exhaust gas from the anode to the combustor to recover residual energy, to increase the overall efficiency of integrated biomass gasification and fuel cell system.    DETAILED DESCRIPTION - A gasification and fuel cell system comprises a fluidized bed gasifier (10) for heating a biomass feedstock to produce a fuel gas of hydrogen and carbon monoxide and carbonaceous char, a combustor for receiving the carbonaceous char from the fluidized bed gasifier and burning the carbonaceous char to produce heat and oxidant gas comprising carbon dioxide and oxygen, and a fuel cell for producing electrical power. The fuel cell has an anode and a cathode. The fuel gas from the gasifier is directed to the anode of the fuel cell. At least a portion of exhaust gas from the anode is directed to the combustor. The portion of the exhaust gas from the anode is combusted to recover residual energy, to increase the efficiency of the system.    An INDEPENDENT CLAIM is also included for operating an integrated gasification and fuel cell system, by introducing inlet gas to fluidize a high average density bed in a first space region; introducing carbonaceous material into the first space region with the dense fluidized bed; circulating inert material to form a product gas; forming a lower average density entrained space region which is contiguous to and above the dense fluidized bed and which contains an entrained mixture of inert solid particles, char, carbonaceous material and the product gas; providing the gas product generated by the gasifier to a fuel cell to use as an anode gas; and directing at least a portion of exhaust gas from the anode to the combustor to recover residual energy to increase the efficiency of the system.    DESCRIPTION OF DRAWING(S) - The figure shows a side view of a gasifier system.    Gasifier (10)