Marlborough, Massachusetts
Ambri’s Liquid Metal™ technology features a liquid calcium alloy anode, molten salt electrolyte, and solid antimony cathode operating at 500–600°C. This chemistry avoids flammable materials and thermal runaway risks, offering inherent safety and stability. It enables 20+ year lifespans with minimal capacity loss and tens of thousands of charge/discharge cycles. The system uses low-cost, recyclable materials, avoids lithium, requires no external cooling or fire suppression, and supports modular, scalable deployment. Recent innovations include UL 1973 certification and progress toward 1 MWh containerized systems by 2025.
Ambri develops Liquid Metal™ battery systems for grid-scale energy storage, including 300 kWh pilot systems and upcoming commercially viable 1 MWh containerized storage systems targeted for shipment by 2025. Their products emphasize long-duration storage, safety, scalability, and cost-effectiveness for utility and industrial applications.
In 2024, Ambri conducted a 12-month pilot with Xcel Energy at SolarTAC in Colorado using a 300 kWh Liquid Metal system to test renewable integration, frequency regulation, and capacity management. The company expanded manufacturing capacity in Massachusetts and achieved UL safety certification. After emerging from Chapter 11 restructuring in 2024, Ambri plans to ship its first containerized storage systems by 2025 targeting industrial and grid clients. It has collaborations with Microsoft, Xcel Energy, and Reliance Industries.
Ambri’s key investors include Bill Gates via Gates Frontier, Paulson & Co., Fortistar, and Reliance New Energy Solar. In 2021, the company raised $144M in a Series E round led by Reliance. After restructuring, ownership shifted to a lenders’ consortium comprising Paulson & Co., Fortistar, and Gates Frontier to support manufacturing scale and product deployment.
