The shift from fossil fuels to renewable energy sources is not a smooth or uniform process. As the world increases its capacity for generating electricity from wind, solar, and other renewables, electrical grids are facing growing challenges. These include managing the imbalance between electricity production and consumption, which can lead to instability in power supply. However, the rapid development of electricity storage technologies is helping to make grids more adaptable and resilient. Battery storage capacity has grown significantly in recent years. In 2025, the global storage capacity reached 108 gigawatts (GW), a 40 percent increase compared to 2024. This represents an 11-fold rise since 2021, showing a clear upward trend. According to the International Energy Agency (IEA), which released its global report for 2026, most stationary battery systems—used for storing electricity in places like homes, businesses, and power plants—typically have a storage capacity of about two hours. However, this is increasing, with some systems now capable of storing electricity for up to four hours. While the majority of installed battery storage systems are large-scale, about 20 percent are "behind-the-meter," meaning they are installed directly at the location of use, such as in homes or small businesses. China leads the world in battery deployment, accounting for 60 percent of global installed storage capacities. Recently, the most powerful battery in the world was deployed in Australia, marking a significant milestone in energy storage technology. Currently, lithium iron phosphate (LFP) batteries dominate the market, accounting for 90 percent of installations. They are favored for their lower cost and better performance in frequent charge and discharge cycles. However, this dominance may not last. In just five years, LFP batteries have grown from less than half of the installed capacity to the majority. Despite this growth, the market is evolving, with several startups exploring alternative technologies. One such company is Peak Energy, which is developing sodium-ion batteries. These offer advantages such as lower storage costs, 99 percent availability, and greater reliability, partly due to the use of passive cooling systems.