ESS Tech Q3 2026 Earnings Date & Estimates

ESS Tech (NYSE:GWH) develops long-duration energy storage systems designed to support the transition to renewable power. The company’s technology uses an iron-based electrolyte in a flow battery, allowing energy to be stored and discharged for extended periods without relying on lithium-ion chemistry. Its systems are intended to help utilities and other energy users manage intermittent renewable generation, improve grid reliability and reduce reliance on fossil-fuel-based peaking resources.

The company’s principal products include the Energy Warehouse, a modular storage system for commercial, industrial and utility applications, and the larger Energy Center platform, which is designed for utility-scale projects. ESS’s systems can be deployed for applications such as renewable energy integration, shifting electricity use to different times of day, microgrids and other forms of grid support.

Founded in 2011 and headquartered in Wilsonville, Oregon, ESS has focused on developing and commercializing its iron-flow battery technology for customers in the United States and international markets. The company became publicly traded in 2021 through a business combination with ACON S2 Acquisition Corp. Eric Dresselhuys serves as chief executive officer.