ESS Tech, Inc. GWH

Company Overview

ESS Tech, Inc. is a U.S.-based energy storage company focused on the development and commercialization of long-duration energy storage systems using iron flow battery technology. The company operates within the renewable energy, grid infrastructure, and utility-scale energy storage industries. ESS designs battery systems intended to provide multi-hour energy storage for electric utilities, independent power producers, commercial and industrial customers, and renewable energy developers seeking to improve grid reliability and integrate intermittent renewable generation such as solar and wind power.

The company’s primary revenue drivers are the sale and deployment of its iron flow battery products, including the Energy Warehouse and Energy Center systems, as well as related engineering and service activities. ESS positions itself around the use of abundant and non-toxic materials, particularly iron, salt, and water, as an alternative to lithium-ion battery chemistries. The company was founded in 2011 and later became publicly traded through a business combination with a special purpose acquisition company in 2021, listing on the New York Stock Exchange under the ticker GWH. Its technology strategy has centered on delivering long-duration storage with an emphasis on safety, scalability, and reduced supply-chain exposure compared with lithium-based systems.