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ESS logo — Safe and sustainable long-duration energy storage.

ESS

Safe and sustainable long-duration energy storage.

Founded 2011 United States Wilsonville, United States 320 employees Post-IPO Equity Total: $374.51M Energy, Renewable Energy +1

General Information

Company Name ESS
Founded Year 2011
Location United States Wilsonville, United States
Employees 320
Industries Energy, Renewable Energy, Energy Storage
Funding Stage Post-IPO Equity
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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 available materials like iron, salt, and water, ESS provides energy storage systems that enhance energy security, reliability, and resilience.

Specializing in the Energy, Renewable Energy, and Energy Storage industries, ESS is strategically headquartered in the United States. The company's products are designed to meet growing energy demands while maximizing the use of renewable resources. This aligns perfectly with global efforts to combat climate change by reducing reliance on fossil fuels.

Recently, ESS received a $50.00M Post-IPO Debt investment from the Export-Import Bank of the United States on 27 June 2024, underscoring investor confidence in its mission and technological capabilities.

Taxonomy: long-duration energy storage, decarbonization, iron flow technology, energy security, renewable energy integration, microgrid applications, off-grid applications, C&I solutions, utility-scale solutions, distributed power generation, iron-electrolyte, energy management system, resilience, energy reliability, flow batteries

Services & Products

Iron Flow Battery Manufacturing
Energy Storage Solution Design
Renewable Energy Integration
Flexible Energy Storage Deployment

Target Customers

AI Data Centers Utility Companies Industrial Microgrid Operators Transport Electrification Initiatives

Funding Rounds & Investors (12)

View All
Funding Stage Amount Investors Lead Investors Date
Post IPO Debt $50.00M 1
Export-Import Bank of the United States
27 Jun 2024
Post IPO Equity $27.50M 1
Honeywell
25 Sep 2023
Post IPO Equity $250.00M 6
Breakthrough Energy Ventures Fidelity Tortoise Capital Advisors
Breakthrough Energy Ventures, Fidelity +4
11 Oct 2021
Series C $30.00M 9
Breakthrough Energy Ventures Evergy Ventures Pangaea Ventures
Breakthrough Energy Ventures, Evergy Ventures +7
28 Oct 2019
Convertible Note Undisclosed 1
SandHill Angels
SandHill Angels
01 Jan 2019
Series B $13.00M 6
Pangaea Ventures Cycle Capital SandHill Angels
Pangaea Ventures, Cycle Capital +4
12 Dec 2017
Venture Round Undisclosed 1
SandHill Angels
SandHill Angels
12 Oct 2016
Series A $3.20M 5
Portland Seed Fund E8 Pangaea Ventures
Portland Seed Fund, E8 +3
07 Oct 2015
Seed Round Undisclosed 1
Portland Seed Fund
Portland Seed Fund
27 Mar 2014
Grant $493.60K 1
NYSERDA
NYSERDA
30 Dec 2013

View All 12 Funding Rounds

ESS Alternatives & Competitors

View All Alternatives
ESS vs
Redox One
Redox One Cyprus

Long Duration Energy Storage Solutions

Series A
22 employees
Energy, Manufacturing
ESS vs
VoltStorage
VoltStorage Germany

Bridging the energy gap - Maximizing value

Acquired
14 employees
Energy, Renewable Energy
ESS vs
AQUABATTERY
AQUABATTERY The Netherlands

The world's most sustainable long duration energy storage solution based on saltwater.

Seed
25 employees
Energy, Renewable Energy
Compare ESS vs AQUABATTERY
View all alternatives

FAQ About ESS

Safe and sustainable long-duration energy storage.
ESS was founded in 2011.
ESS is headquartered in Wilsonville, United States.
ESS operates in Energy, Renewable Energy and Energy Storage. Its work centres on long-duration energy storage, decarbonization, iron flow technology and energy security. Its customers include AI Data Centers, Utility Companies and Industrial Microgrid Operators.
ESS has approximately 320 employees.
ESS has completed 12 funding rounds, raising a total of $374.51M. The latest funding stage is Post-IPO Equity.
ESS offers: Iron Flow Battery Manufacturing, Energy Storage Solution Design, Renewable Energy Integration, Flexible Energy Storage Deployment.
Top alternatives and competitors to ESS include Redox One, VoltStorage, AQUABATTERY, SB Energy, RFC Power. These companies operate in related industries and serve comparable markets. You can compare them side by side on Bounce Watch.
ESS and Redox One are both companies in similar industries. Compare their funding, team size, growth signals, and market position on Bounce Watch to see which one fits your needs.

Source: BounceWatch company record for ESS, https://bouncewatch.com/company/ess-inc, updated 19 August 2025. When citing, please name BounceWatch and link this page.

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