Nowadays, with the increase of living standard and modernization, expansion of population and increase in purchase power of society, there are large amounts of waste generated which needs to be handled and disposed on landfills. Landfilling of mentioned waste is becoming more dangerous and more expensive. More important, large amount of waste that is landfilled near large towns and cities have negative consequences on human health and life quality in those places. The problem of waste is not only in its management but it consists of several elements – collecting of waste and its transportation, evaluation and utilization of waste. Because of those problems, scientists and engineers are working on a development of various methods of disposal, recovery, recycling and treatment of waste in order to reduce the pressure on overflowing landfills. Waste can be used in many ways: sorting at the source of generation and recovery of materials, reuse of waste, incineration for energy utilization (electrical and thermal energy generation), usage of biogas for energy generation and/or refuse-derived fuel. Energy utilization of waste presents a good solution for solving some of the waste problems – for instance, the problem of generating too much waste on overflowing landfills and the need for alternative energy sources. In this paper, the treatment methods are shown and explained as well as the process of obtaining energy which can be extracted from mixed municipal solid waste.