ESS vs VoltStorage
ESS
Safe and sustainable long-duration energy storage
320 employees · est. 2011 · Wilsonville, United States
ESS is the older company (2011 vs 2016); ESS is the larger of the two.
Side-by-Side Comparison
| Metric | ESS | VoltStorage |
|---|---|---|
| Founded | ||
| Founded | 2011 older | 2016 |
| Headquarters | ||
| Headquarters | Wilsonville, United States | Germany |
| Employees | ||
| Employees | 320 larger | 14 |
| Industry | ||
| Industry | Energy, Renewable Energy, Energy Storage | Energy, Renewable Energy, Clean Energy |
| Funding Stage | ||
| Funding Stage | Post-IPO Equity | Acquired |
| Total Funding | ||
| Total Funding | $374.51M | $67.05M |
| Funding Rounds | ||
| Funding Rounds | 12 | 13 |
| Services | ||
| Services | Iron Flow Battery Manufacturing, Energy Storage Solution Design, Renewable Energy Integration, Flexible Energy Storage Deployment | Energy Storage Solutions, Renewable Power Optimization, Battery Technology Development, Grid Resilience Solutions |
| Target Customers | ||
| Target Customers | AI Data Centers, Utility Companies, Industrial Microgrid Operators, Transport Electrification Initiatives | Utilities, Commercial and Industrial Facilities, Rural and Isolated Communities, Oil and Gas Industries, Data Centers, Critical Infrastructure Facilities |
| Taxonomy | ||
| Taxonomy | Long-duration Energy StorageDecarbonizationIron Flow TechnologyEnergy SecurityRenewable Energy IntegrationMicrogrid Applications +9 | Energy StorageIron Salt BatteryGrid DeferralLong-Duration Energy StorageRedox Flow TechnologySustainable Energy Solutions +8 |
| Website | ||
| Website | essinc.com | voltstorage.com |
About ESS
ESS Tech, Inc. (NYSE: GWH) stands out in the burgeoning field of long-duration energy storage with a clear focus on safe and sustainable solutions. Founded in 2011, the company has dedicated over a decade to advancing decarbonization through its innovative iron flow technology. By utilizing readily...
About VoltStorage
VoltStorage, founded in 2016 and headquartered in Germany, is at the forefront of tackling global energy challenges. With the slogan "Bridging the energy gap - Maximizing value," the company targets the rising disconnect between energy supply and demand by developing advanced energy storage solution...
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Compiled from the BounceWatch company index. We last looked at ESS on 19 Aug 2025, and VoltStorage on 27 May 2026. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.
