After a brief background review of fluidized bed combustion, the objectives and status of six pressurized fluidized bed (PFB) projects are described. There are several key technical issues and problem areas concerning the PFB combustor and support components and the gas turbine. The program also studies advanced combustion systems, advanced feed handling, and advanced hot-gas cleanup. 18 references, 8 figures, 4 tables. (LEW)