Biomass gasification is a technology that transforms solid biomass into gas. A gasifier is capable of converting wood into a gaseous fuel that is fed into a gas motor. The gas motor controller regulates both the gas motor and the gas motor generator. In this paper 2 fuzzy logic controllers have been developed using speed and mechanical power deviations, and a neural network has been designed to tune the gains of the fuzzy logic controllers based on the operating conditions of the biomass-based electric power plant.