In this article, the concept of a new simple neuro-fuzzy control scheme for a combined-cycle power plant is presented. Gasification technologies under development would enable the residual biomass to be used in gas turbines. Biomass conversion to a clean essentially ash-free form, usually by gasification and purification, is necessary to obtain high efficiency. This paper reports results of detailed full-load performance modeling of cogeneration systems based on gasifier/gas turbine technologies.