Construction of the Track System Kozienice Power Plant with the SRK system and the power industry HDD drilling under the Vistula River Construction of the PTA installation in Włocławek Construction of the hallŁódź Agglomeration Railway Construction of the overhead line 110KV Koluszki - Brzeziny Construction of approach lights Rzeszów Jasionka Warsaw Metro Construction of the South Hospital in Warsaw Modernization of the railway line Warsaw - Lodz stage II HDPE PKN Orlen SA in Płock Construction of a reservoir park at OLPP Koluszki Construction of the MPS Depot for the F-16 Construction of MPS-1 and MPS-2 Poznan Krzesiny Construction of the E75 Rail Baltica railway line Warsaw - Bialystok Construction of the Oil Terminal in Gdansk Łódź Chojnywater pumping station Expansion of the siding railway station in TP No. 74 in Ostrów Wielkopolski Expansion of the existing plant repair rolling stock - implementation of stage II of the investment in Libiszów Modernization of the railway line Lodz - Warsaw CERTIFICATES