ESS Tech, Inc. (NYSE: GWH) is a Portland, Oregon‐based company specializing in long‐duration iron flow battery energy storage solutions. The company’s core business centers on the design, manufacture and deployment of modular battery systems that store electricity using an iron‐chloride electrochemical process. These systems are engineered to support grid operators, utilities, commercial and industrial customers in integrating renewable power, managing peak loads and ensuring reliable back‐up power.
At the heart of ESS Tech’s offering is its “Energy Warehouse,” a containerized flow battery system featuring non‐toxic, fully recyclable materials and a simple architecture that separates energy storage capacity from power output. This design enables multi‐hour discharge durations, rapid deployment and a long operational lifespan with minimal maintenance. ESS Tech also provides project engineering, system integration and ongoing field services to optimize performance over the life of each installation.
ESS Tech serves markets across North America, Europe, Asia and Australia, where long‐duration storage is increasingly sought to complement solar and wind generation. Its customers include utilities aiming to smooth renewable intermittency, developers of microgrid projects in remote locations and commercial users seeking to reduce demand charges. The company’s modular approach allows for scalable deployments, from small‐scale C&I sites to multi‐megawatt grid installations.
Founded in 2011, ESS Tech emerged from applied research in flow battery chemistry and has since advanced through multiple private funding rounds. In early 2023, the company completed a business combination transaction and began trading on the New York Stock Exchange under the ticker GWH. ESS Tech is led by an executive team with extensive experience in energy technology, aiming to commercialize affordable and sustainable storage solutions that support the global transition to renewable energy.
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