Energy recovery potential from municipal waste in Osaka City is estimated. Using field survey result, total municipal waste discarded in Osaka city is classified into household waste and business waste, and also classified into several components such as paper, food waste, plastics etc. Heat values of each component are estimated by experiment result. Using these results, change of amount and heat value of whole municipal waste due to progress of material recycling is estimated. Total amounts of primary energy saving by energy recovery from municipal waste under variou's recycling status and various energy recovery systems such as high-pressure steam recovery or combined heat and power are also estimated.