Inlyte Energy recently hit a significant milestone by completing the factory acceptance test of its first field-ready iron-sodium battery storage system. The test was conducted at the company’s facility near Derby, UK, with representatives from Southern Company, one of the largest energy providers in the United States, in attendance. This achievement demonstrates the system’s performance and readiness for integration, marking an essential step toward commercialization.
Iron-Sodium Battery: A Game-Changer in Energy Storage
The global energy storage sector is growing rapidly, with projections indicating an increase from $70 billion in 2025 to over $150 billion by 2030. According to the U.S. Department of Energy, more than 225 gigawatts of long-duration energy storage (LDES) will be required by 2050 to support a more reliable U.S. grid. Current Lithium-ion battery technology is not equipped to meet these requirements at an economic scale, making innovations like Inlyte Energy’s iron-sodium battery a critical component in bridging this gap.
The tested system is notable for its scale and capability. It represents the world’s largest sodium metal chloride battery cells and modules to date, storing over 300 kilowatt-hours of energy each. These batteries offer competitive efficiency and cost advantages, making them a viable solution for long-duration energy storage needs.
Efficient Performance Validated
During testing, Inlyte’s iron-sodium battery achieved an 83% round-trip efficiency, including auxiliaries. This performance rivals high-performance Lithium-ion systems and far surpasses the typical efficiency range of 40-70% seen with other LDES technologies. Southern Company’s research and development team observed the test, validating the system’s readiness for deployment. The first installations are scheduled for early 2026 at Southern Company’s Energy Storage Test Site in Wilsonville, Alabama.
Advantages of Iron-Sodium Technology
Inlyte Energy’s CEO, Antonio Baclig, emphasized the importance of innovation in transforming the energy market. He stated that to secure the future of energy in the U.S., innovative technologies with lower costs, enhanced safety, and improved durability are essential. By utilizing iron in sodium metal chloride batteries, Inlyte Energy is setting the foundation for scalable and sustainable energy solutions.
Energy storage solutions like these play a vital role in maintaining grid reliability, enhancing resilience during extreme weather, and reducing long-term expenses. With its proven technical readiness, Inlyte’s iron-sodium battery paves the way for efficient domestic energy storage.
Future Plans and Strategic Partnerships
Building on this success, Inlyte Energy is taking significant strides toward full-scale production and commercialization. The company is finalizing plans to establish its first U.S.-based production facility in 2026. To accelerate this process, Inlyte has partnered with HORIEN Salt Battery Solutions, a global leader in sodium metal chloride battery manufacturing. HORIEN’s extensive 25-year experience in commercial-scale sodium battery production complements Inlyte’s innovative system integration expertise. Together, these companies aim to bring domestically produced iron-sodium battery systems to market by 2027.
This partnership combines state-of-the-art manufacturing practices with cutting-edge battery technology. Applications span multiple sectors, including critical power, remote industrial operations, and large-scale energy storage solutions.
Conclusion
The successful factory acceptance test reflects Inlyte Energy’s commitment to advancing energy storage technologies that are efficient, scalable, and cost-effective. With its plans for U.S. manufacturing and a strong partnership with HORIEN, Inlyte is poised to revolutionize the energy storage industry. As global demand for long-duration systems increases, iron-sodium batteries offer a reliable and sustainable solution for the growing energy needs of the future.
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