ESS Tech, Inc. has been awarded over 20 additional patents for the company's iron flow battery (IFB) technology since the beginning of 2022. This brings the total number of patents held by the company to 62 worldwide with a further 225 applications filed. Founded in 2011, ESS has built an extensive portfolio of patents, proprietary knowledge, and experience in scaling the commercial manufacturing and deployment of iron flow battery systems. ESS' innovations have addressed the critical advancements needed to facilitate mass adoption of IFB technology including the company's patented Electrolyte Health Management System (EHMS).

Collectively, these innovations have created systems capable of delivering unlimited cycling with zero capacity-fade over their operating life. ESS systems provide up to 12 hours of long-duration energy storage for utility and commercial-scale applications. The company's technology has been validated by multiple third parties including the U.S. Department of Energy's ARPA-E program, global insurer Munich Re, and utility and commercial customers worldwide.

ESS recently announced a partnership with Coldwell Solar to deploy Energy Warehouse systems to microgrids that will power multiple wineries in California, safely providing power even during wildfire conditions. The company's battery modules have been ETL certified to conform to UL 9540A and UL 1973 standards, further affirming ESS modules' quality, resilience and ability to operate safely.