ESS Inc. develops and manufactures second-generation iron flow battery systems, including the containerized Energy Warehouse™ (EW) and the battery-in-a-building Energy Center™ (EC). The technology uses earth-abundant iron, salt, and water for a safe, fully recyclable electrolyte and is designed for multi-hour storage (up to 10 hours) with long operating life and unlimited cycling. The company targets time-shifting of renewables, demand‑charge management, ancillary grid services, and transmission‑ and distribution‑level applications. ESS is shipping to customers on four continents and has an order pipeline it intends to serve by scaling manufacturing. To support deployments and project financing, ESS has partnered with Munich Re to offer an insurance-backed warranty. The company highlights a design-build approach for multi‑MW projects and aims to lower levelized cost of storage per kWh. Ess, Inc. develops and manufactures the Energy Warehouse™, an all-iron flow battery for commercial and utility-scale energy storage. The battery is designed to provide 4+ hours of flexible energy capacity and over 20 years of operating life with no capacity fade. Its electrolyte uses iron, salt, and water, positioning the product as an environmentally safe, long-life storage solution. The company plans to expand and automate its manufacturing process to scale production. The new funding is intended to enable a production capacity of 900 MWh per year. Ess was established in 2011 and is based in Portland, Oregon; Craig Evans is the CEO. ESS Inc. develops and commercializes an All-Iron Redox Flow Battery designed for long-duration energy storage (6–12 hours) using earth-abundant iron, salt and water. The company reports the chemistry yields no degradation over 10,000 cycles and supports 20+ year lifetimes, targeting bulk energy shifting from wind and solar and multiple behind- and front-of-meter use cases. ESS moved into a new 23,000-sq.-ft. production facility in Portland, OR and plans initial customer deployments this fall, with a production ramp of its 125kW/1MWh system in 2016. Financially, ESS closed a $3.2M Series A led by Pangaea Ventures and complements roughly $4.5M in development grants from ARPA-e, ONAMI, Oregon Best and others. The Series A proceeds will fund tooling investments for volume production of low-cost battery components and support market development activities. ESS was established in 2011 and is headquartered in Portland, OR.

Total raised

$46M

Funding rounds

3

Latest round

Series C

Latest activity

Oct 2019