In this work, simulation and optimizations for stand-alone hybrid Photovoltaic (PV)/Wind energy systems were carried out for two local Jordanian climate conditions. Using hybrid PV/wind system makes better utilization of mainly available types of renewable energy resources, which are solar and wind energy resources, than single energy systems. The major problem that arises is by how much each of the energies should be relied upon. In order to get the optimal design and sizing for a hybrid PV/wind energy system, optimization processes must be developed to get best economical and reliable design for the proposed system. The proposed system should always satisfy all constraints such as meeting load demands along the year and any other limitations. The optimization problem was solved as an Integer Programming problem and using Particle Swarm Optimization (PSO).