ESS, Inc. provides iron‑flow battery systems that store up to 22 hours of energy using a fire‑safe saltwater electrolyte, delivering unlimited cycling with zero capacity loss over a 25‑year design life. The modular, American‑made solutions can be deployed in months and scale to meet the baseload power needs of utilities, renewable developers, and large‑scale energy users such as AI data centers. By capturing excess renewable generation and releasing it on demand, ESS enables reliable, long‑duration storage with lower operating costs compared to conventional lithium batteries.
Funding
$30M raised to dateRaised to date based on public sources. This may differ from the amount the company actually raised and is based only on what is publicly available on the internet.
YAFounders
Product
Problem
Electric grids and large energy consumers face increasing demand for reliable, long-duration power to balance intermittent renewable generation and the growing load from AI data centers. Existing storage technologies, such as lithium batteries, struggle with safety concerns, limited cycle life, and long lead times, making it difficult to provide continuous baseload power.
Solution
ESS, Inc. offers iron‑flow battery systems that store energy for up to 22 hours, delivering safe, long‑duration power without capacity loss over a 25‑year design life. The technology uses a saltwater electrolyte, eliminating fire risk and enabling rapid, modular deployment in months rather than years. Unlimited cycling and zero degradation reduce total cost of ownership, while the scalable architecture allows projects to expand capacity as demand grows. By capturing excess renewable generation and releasing it on demand, ESS’s solutions provide baseload reliability for data centers, utilities, and other large‑scale energy users.
Target Audience
Primary customers include utility operators, renewable energy developers, and large‑scale power consumers such as AI data centers that require safe, long‑duration storage to ensure continuous, reliable electricity supply.
Features
- Iron‑flow battery modules with up to 22 hours of energy storage per unit
- Saltwater electrolyte delivering fire‑safe operation and low environmental impact
- Unlimited charge‑discharge cycles with zero capacity degradation over a 25‑year design life
- Modular, American‑made construction enabling rapid deployment and easy scaling
- Flexible integration for grid‑level storage, data center backup, and renewable baseload applications
- High round‑trip efficiency and low operating costs compared to conventional lithium systems