Energy storage systems (ESS) are essential for improving the performance and reliability of power systems, especially as renewable energy sources become more prevalent. This study focuses on determining the minimum amount of ESS needed to reduce power loss associated with integrating renewable energy. Through detailed simulations and case studies using the IEEE33 and IEEE69 bus test distribution systems, this paper demonstrates the importance of setting this minimum requirement. This helps optimize system efficiency, cut costs, and strengthen overall resilience in the face of challenges posed by renewable energy integration.