Renewable energy sources like solar and wind power are abundant, clean, and increasingly cost-effective. However, their intermittent nature—the fact that their output fluctuates depending on the availability of sunlight or wind—presents a significant challenge for integrating them into the electricity grid and achieving a truly sustainable energy system. Energy storage is the key to unlocking the full potential of renewable energy, providing the flexibility and reliability needed to create a cleaner, more resilient, and affordable grid.