Abstract
MSW discharged from small or intermediate cities, etc. are renewable energy sources which are generated near locations of use, stably, and in large quantities. Although their heating value is low in comparison with fossil fuels, these resources have attracted attentions because they are economical and have small CO_2 emission factors. The relative value of Refuse-derived fuel (RDF) produced from MSW has changed greatly over the past ten years. There is an extremely high possibility of further popularization of fuel conversion/use of MSW discharged from small or intermediate cities in the future.