This 1967 natural gas power plant in the Russian Republic of Tartarstan and the city of Nizhnekamsk needed to deliver 495-MW capacity to customers and reduce its emissions. Engineering, procurement and construction contractor ENKA designed an integration with an existing petrochemical plant nearby to allow it to become a combined-cycle plant using as  fuel both natural gas and syngas, a combination of methane and hydrogen that is a byproduct of processes from a neighboring facility. Gas-mixing stations keep the energy value of the fuel gas stable by varying the mixing ratios in response to fluctuations in the composition of the syngas supplied. ENKA worked with supplier Siemens to place a SST-600 steam turbine, two SGT5-2000Еgas turbines, two heat-recovery steam generators and an 88-ft-tall draft cooling tower within the existing footprint. Nearly 28,000 cu yd of concrete were required for four new buildings at the plant and the cooling tower. MEP engineer Yalçın Karabulut installed 12 sections of modular heat-recovery steam generators and underground steel pipes.