The expansion and modernization of the Warsaw Municipal Solid Waste Disposal Plant (ZUSOK) is taking place at an operating facility. The plant is runing, remaining its original capacity, processing 40,000 tons of mixed waste per year, while we are carrying out an intensive construction and engineering process related to its expansion. Upon completion in 2024, WtE plant will increase its capacity sevenfold, processing up to 305 thousand tons of mixed waste per year. The investment is generating a lot of interest among professionals, and at POSCO E&C we are eager to share our experience and knowledge, hence the study visits where we present this intensive investment process from close. In January 2023, we were visited by engineers from the Mazovian District Chamber of Civil Engineers and fourth-year students of the Faculty of Architecture at the Warsaw University of Technology.