In recent years, environmental concerns and the depletion of fossil fuels have drawn significant attention to renewable energy resources, particularly wind turbines and solar energy, among power system operators and designers. However, the installation and commissioning costs of solar, wind, and other renewable-based generation systems are, on average, higher than those of conventional fossil-fuel power plants. Moreover, the expansion of grid infrastructure and the deployment of energy storage systems impose additional expenses. Another major challenge arises from integrating renewable energy sources into existing distribution networks. This process often requires infrastructure upgrades, modifications to load management systems, and the establishment of communication with smart devices within the grid. Consequently, electrical energy storage systems (EESS) are increasingly employed as complementary resources. In the presence of grid-connected storage units, energy exchange between the power grid and storage systems can be managed in a way that significantly enhances the resilience of the grid against unpredictable events. the problem of optimal placement and sizing of electrical energy storage systems in smart power networks involves numerous technical and economic challenges, while also contributing to enhanced grid resilience. Accordingly, the objective function of this study is formulated to account for both the design and operational costs of storage systems, while explicitly considering resilience indices as a key performance measure.