The All-Iron Flow Battery
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Utilizing earth-abundant iron, salt, and water for its electrolyte, and simple
materials for battery components, the Iron Flow Battery (IFB) from ESS Inc. is a durable, environmentally-safe, long-duration storage solution that is ideally suited for:

  • time-shifting renewable energy of a daily basis,
  • managing a facility’s demand charges, and
  • smoothing the intermittentcy of renewables on a constrained grid.

Our patented battery design reduces system costs by combining an extremely cost effective electrolyte with an innovative cell design that dramatically increases power density and enables a smaller, less costly power stack.

Not only is the IFB extremely cost-effective, it is environmentally friendly as well. With a non-toxic, non-hazardous, and completely recyclable iron-based electrolyte, the IFB sets a high bar for safe, reliable and environmentally conscious energy storage.


What’s a Flow Battery?

A flow battery is an easily rechargeable system that stores its electrolyte—the material that provides energy—as a liquid in external tanks. Unlike typical batteries that are packaged as fixed cells or modules, a flow battery allows the battery’s power (the rate of electricity flow) to be decoupled from the battery’s capacity (the total amount of energy held). As a result, users are free to tune the battery’s specifications to their specific needs.

The ESS Advantage


No other technology is better suited to distributed energy storage than Energy Storage System’s IFB energy management system. What sets the IFB apart from other storage technologies is the marriage of an extremely cost effective electrolyte with our patented, highly efficient battery cell design. This combination allows ESS to demonstrate IFB performance exceeding that of commercially available Vanadium Redox Flow Batteries (VRB’s), but at a cost 70% below that of other electrochemical energy storage technologies. With the IFB energy management system, end-users finally have a way to harness their local electricity rates structures to their economic advantage.