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A model was developed to design, simulate and predict the performance of a micro- irrigation system powered by a renewable energy source. PV solar systems and a wind turbine were considered for the modeling. The model predicts the energy demand based on the water demand needed for the irrigation system using the hydrological methods of designing irrigation system laterals and drip lines. The water demand is predicted using metrological data, and a statistical distribution is used to predict the expected upper limits of water demand. The lower limits of available energy are predicted also using the metrological data and stochastic methods. The amount of energy is calculated based on the minimum irrigation interval available, and then the renewable energy system is designed to assure the desired reliability.