The city of Yogyakarta is the most significant waste contributor at the Piyungan Integrated Waste Disposal Site (TPST), Dukuh Ngablak. The need for land in landfill is getting higher and negatively impacts the environment, so processing waste into energy is one option. This study aims to answer whether the city of Yogyakarta is feasible in processing waste into energy. This study uses secondary data from the generation and composition of waste from the 2020 National Waste Management System. At the same time, the calorific value data is used from the literature study. The waste generation rate in 2020 in Yogyakarta City reached 0.09 kg/person/day. However, the waste generation produces a total dry weight of 274900.3 kg dry weight/day, while the complete potential energy recovery is 2290773.3 MJ/day. Therefore, the total calorific value of the Yogyakarta City waste generation is 6.37 MJ/kg, indicating a low value. This answers that waste processing with a thermal process is not suitable if applied with a mixture; therefore, high moisture waste must be separated first to produce a high calorific value.