In the present study, investigated an energy production system using three types of renewable energy: solar, wind and ocean thermal energy with climatic conditions and close to areas with high potential for the OTEC system, Has a good position in terms of wind speed and solar radiation, used them as energy sources. The proposed system is designed and evaluated based on the total daily electricity consumption required by a beach welfare complex. The main components of the system consist of an organic Rankine cycle, turbine, thermoelectric, pump, heat exchanger, wind turbine and a flat plate solar collector. EES software has been used as an engineering tool to model the system and obtain thermodynamic results. The system is designed for an area with good ocean thermal energy, wind energy and solar energy. The most important and effective parameters in these studies are wind speed, solar radiation and Solar heat collector area. Finally, in order to optimize the designed system, the multi-objective genetic algorithm with Non-dominated Sorting Genetic Algorithm-II or NSGA-II algorithm is used to find the best target functions and Pareto chart extraction is used to determine the best values for the target functions. Design variables used for optimization include Solar system area (Ap), output temperature from solar system (T1), turbine inlet temperature (T3), evaporator pinch point (PPeva), thermoelectric parameter (Z_T_M), pump efficiency and turbine efficiency. The two objective functions of this optimization are exergy and system cost rate. After optimization, the Pareto diagram was obtained with a set of optimal points. Finally, the optimal value for exergy efficiency was 14.47% and the cost rate 74.97 ($/h). The introduced systems are suitable for the required applications according to the obtained results. The introduced systems are suitable for the required applications according to the obtained results.