ESS Tech (GWH)

The company’s technology uses iron, salt, and water as core materials, distinguishing it from battery systems that rely on lithium, nickel, cobalt, or other minerals commonly associated with consumer electronics and electric vehicles. ESS Tech’s iron flow batteries are designed for high cycle life, safety, and recyclability, with an emphasis on stationary grid and commercial applications rather than portable devices or passenger cars.

ESS Tech operates as a single business segment covering the design, engineering, manufacturing, and support of its energy storage products. Its systems are intended for use in microgrids, renewable energy integration, utility-scale deployments, and other settings where multiple hours of storage may be valuable. The company generates revenue from product sales and related service contracts.

As an emerging clean energy hardware company, ESS Tech’s business is shaped by manufacturing scale-up, customer adoption, project timelines, policy support for grid storage, and competition from lithium-ion batteries and other long-duration technologies. Its investment profile is tied to the broader transition toward more flexible, resilient, and low-carbon electricity systems.