ESS Tech, Inc. is the first long-duration energy storage company to go public in the U.S. Since 2011, we have transformed
the value proposition for long-duration storage through our unique iron flow battery technology. Transitioning from
fossil fuels to renewable energy sources is more important than ever, and we believe our technology is a game
changer in enabling the power grid of the future, today.
Differentiated Technology
ESS’ one-of-a-kind iron flow battery technology is the first to market, giving us a first mover advantage. The raw
ingredients of iron, salt, and water are responsibly sourced, earth-abundant, and easy to recycle, making our
low-cost technology the most environmentally sustainable option available today. Iron flow technology also means our
batteries are non-flammable, non-toxic, and carry no risk of explosion, making them flexible enough to deploy in a
wide range of climates or geographies.
Longer Duration
Renewable intermittency creates issues for the electrical grid, which can require electricity when renewable sources
are not generating and lacks sufficient energy storage capability to ensure reliability. ESS shifts supply to meet
demand with long-duration energy storage systems that discharge energy for up to 12 hours, compared to lithium-ion
batteries which typically offer a maximum duration of 4 hours. Our long-duration iron flow batteries improve grid
stability, enhance the value of renewable energy, and enable greater resiliency to extreme weather and other
unexpected events.