Fundraising Fox
ESS Inc.
Founded 2011 · 308 employees on LinkedIn · 4 known investors
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ESS Tech, Inc. builds iron flow battery systems for long-duration energy storage, offering up to 22 hours of storage to provide baseload power for grids, AI data centers, and communities. Its American-made systems are designed for a 25-year life with no capacity degradation.
Founders & leadership
ESS Inc. was founded in 2011 by Craig Evans.
Investors · 4
How we know: Pangaea Ventures Us Inc.'s portfolio page · Not right? Tell us
How we know: the VCSheet dataset · Not right? Tell us
Founder mafia
2 people who came through Essinc went on to found or lead other companies.
Non-dilutive funding · 4 SBIR/STTR awards
Federal grants — no equity taken| Agency | Phase | Year | Amount |
|---|---|---|---|
| U.S. Air ForceAir Force | Phase I | 2020 | $50K |
| ARPA-E | Phase II | 2015 | $1.1M |
| ARPA-E | Phase II | 2012 | $1.5M |
| ARPA-E | Phase I | 2012 | $225K |
Source: SBIR.gov award data (U.S. Small Business Administration). SBIR/STTR awards are competitive federal R&D grants and contracts — non-dilutive capital alongside any venture rounds above.
Frequently asked questions
- What does ESS Inc. do?
- ESS Tech, Inc. builds iron flow battery systems for long-duration energy storage, offering up to 22 hours of storage to provide baseload power for grids, AI data centers, and communities. Its American-made systems are designed for a 25-year life with no capacity degradation.
- Who founded ESS Inc.?
- ESS Inc. was founded by Craig Evans in 2011.
- Who are ESS Inc.'s investors?
- ESS Inc.'s investors include Breakthrough Energy Ventures, Pangaea Ventures Us Inc., Sand Hill Angels, Cycle Capital.