This paper presents a systematic methodology for synthesis of steam turbine network in the site utility of process plant. The optimization problem involves the selection of the steam turbines. Exergoeconomic modelling techniques are well known techniques to optimize thermal systems. These methods are usually based on the definition of a superstructure that includes the major options of the design. It reveals some weaknesses when dealing with particularly complex systems where total site analysis leads to a lot of possible configuration. In this regard, a new procedure has been developed to be used in the context of a multi-objective optimization framework and heat integration techniques. The application of the proposed optimization approach is illustrated through a case study.