The expansion and modernization of the Solid Municipal Waste Disposal Plant in Warsaw (ZUSOK) is spectacular. It is the only investment within a thermal waste processing plant (WtE) carried out on an operating facility. When the expansion is underway, ZUSOK is continuously processing mixed waste at 40 thousand tons/year. Upon completion, its capacity will increase to 305 thousand tons/year, and it will be the largest plant of this kind in Poland. This is the second waste incineration plant built in Poland by the Polish branch of POSCO E&C, after the WtE plant in Kraków (2013-2016).