In this paper, an energy and exergy analysis is performed, as well as a comparison of seven steam turbines from seven different steam power plants. From the measured/actual parameters of steam, pressure, temperature and mass flow rate, the values of specific enthalpy and specific entropy for the characteristic points of the turbine process were obtained. Using these parameters the values of theoretical and actual power achieved on the turbines were calculated. Furthermore, the energy efficiency values of the turbines were obtained and a comparison of the obtained values was made between the turbine cylinders, which are divided into high-pressure, medium-pressure and low-pressure. After summing up the values achieved on individual turbine cylinders, values were obtained for the entire turbine plant, which were also compared with each other. In addition to the energy analysis, an exergy analysis was performed, for which, in addition to the actual steam parameters, environmental parameters were also required. For the sake of even comparison regarding turbine cylinders and whole turbines, the ambient temperature of 25°C and ambient pressure od 1 bar were taken into account when calculating the input and output exergy. Knowing the actual power achieved on turbines and input and output exergy, the values of exergy efficiency of the turbine cylinders were obtained, which were also compared for high-pressure, medium-pressure and low-pressure cylinders. After summing the values obtained by exergy analysis for turbine cylinders, results were obtained for the entire turbine plants, which were compared with each other.