With the aim of achieving highly efficient waste power generation through combustion in the fluidized bed and by utilizing RDF (Refuse Derived Fuel) as an energy resource, a mixed fuel of RDF and coal was burned and a running test for energy recovery was conducted, using an internal-circulation type fluidized bed boiler designed for sole combustion of coal with a maximum steam generation rate of 70.6 t/h. Evaluation was then made with a focus on the characteristics of emissions and on heat recovery, and we concluded that waste power generation using RDF has become a practicality. From the results of this test, there seemed to be a possibility that, when burning RDF and coal together, NOx goes through a generation mechanism that was different from the one that took place when burning coal alone because of the influence of combustion at the freeboard part, the influence of the composition of RDF, interactions with CO, hydrogen chloride, and other gases that are generated during combustion. It is also found that there was a strong relationship between the concentration of dioxins and that of hydrogen chloride that is generated during mixed combustion of RDF and coal. Another finding is that it is highly possible that the calcium compound added to RDF during manufacture contributes to a reduction in the concentration of hydrogen chloride and that of dioxin emissions.