Due to the increase in demand for water and the scarcity of water present in some regions of the world, the need to use water desalination methods has become a necessity for the future of water security, and due to the increase in energy prices, especially in the proportion of countries that import most of their energy needs, the world is heading to energy production from Nature and the environment. And because of the intermittentintermittency of renewable energy, many studies have been conducted around the world on the topic of energy storage. In these simulation studies, a techno economic analysis was carried out to choose the suitable reverse osmosis desalination system for a brackish water using renewable energies with two types of energy storage technology for some scenarios. Here, four scenarios are compared: PV/T with batteries, PV/T with pump storage, PV/T and wind turbines with batteries, PV/T and wind turbines with pump storage. This paper analyses the model of different scenarios using MATLAB. The sensitivity analysis of changing temperature and salinity of brackish water on the pressure of the reverse osmosis system and on the specific energy was considered,. Also, the sensitivity economic analysis was considered.