Criteria for evaluating process-circuit and layout solutions adopted in designing steam-turbine units are presented together with their values for a number of steam-turbine units produced by the Ural Turbine Works. The presented values of the criteria are recommended for being used as tentative ones in designing new thermal power plants or in upgrading them with the use of steam turbine units operating both as basic power installations and as part of combined-cycle power plants. The influence of process-circuit and layout solutions adopted for steam-turbine units on the effectiveness of thermal power plant construction and plant performance efficiency is shown.