The ESS iron flow battery uses the same electrolyte on both positive and negative sides. And the proton pump maintains the state of charge and battery health. While competing non-lithium technologies are still in the lab, our advanced LDES technology is field-proven and already deployed worldwide.
ESS EW iron flow battery storage containers. Courtesy of ESS Iron flow batteries, also known as iron-air batteries or iron-redox flow batteries, are energy storage technology that stores electrical energy in chemical form.
There is a gap in the market for long-duration energy storage (LDES), according to US-based manufacturer ESS Inc. – one which can’t be plugged with lithium-ion chemistry. Hugh McDermott, of ESS Inc. tells pv magazine how he thinks iron flow batteries fit into the energy system of the future, as the company pursues global expansion.
The chemistry of ESS’ flow battery electrolyte is essentially salt water and iron. The company says it is transparent about this chemistry because it differentiates itself on the design of its battery stack and the automated process for producing them. This is where the patents and intellectual property are.
Our standardized photovoltaic power generation and energy storage products are engineered for reliability, safety, and efficient deployment. All systems include comprehensive monitoring and control systems with remote management capabilities.
Since 2011, ESS Tech, based in Wilsonville, Oregon, has innovated based on the concept of all-iron redox flow battery (IFB) and led the commercialization effort of IFB …
Leading the charge ESS continues to lead the industry with a commitment to innovation, research and development that underpins every iron flow battery project. These awards underscore our …
ESS Iron Flow Battery is a non-lithium electrochemical energy storage system utilizing iron, salt, and water as electrolytes, designed for 4–12 hour duration applications in commercial and …
McDermott said these investments and additional commercial projects will help underwrite ESS’ engineering efforts to expand iron flow battery acceptance. Other companies …
Hugh McDermott, of ESS Inc. tells pv magazine how he thinks iron flow batteries fit into the energy system of the future, as the company pursues global expansion.
There is a gap in the market for long-duration energy storage (LDES), according to US-based manufacturer ESS Inc. – one which can’t be plugged with lithium-ion chemistry. …
The all-iron battery is an electrochemical cell for powering an electronic device. It contains two chemical reagents, one of which is oxidized and the other is reduced. The result …
In June 2025, ESS Tech accelerated its iron flow long-duration energy storage roadmap by 18 months, achieving 12.2 hours at rated power with improved efficiency, durability and cost …
Long duration energy storage (LDES) technologies are vital for wide utilization of renewable energy sources and increasing the penetration of these technologies within energy …
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