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ESS
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Short description

Developer of a flow battery technology that utilizes earth-abundant iron as its energy storage medium

Founded in 2011
Founded in

Company type Public Public (GWH)
Company type

Industry Group energy & power

Sector energy storage

TRL Range 7-8
TRL 1 Basic research
TRL 2 Technology formulation
TRL 3 Applied research
TRL 4 Small scale prototype
TRL 5 Large scale prototype
TRL 6 Prototype system
TRL 7 Demonstration system
TRL 8 First of a kind commercial system
TRL 9 Full commercial application
TRL Range

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Headquarters Wilsonville, OR Wilsonville, United States
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Updated by Craig Evans at ESS, Inc. on 01/10/2017

Edited by Cleantech Group on 10/12/2021

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Date Company
08/03/2021

TerraSol Energies TerraSol Energies

ESS signs contract to provide a long-duration flow battery system for industrial recycling facility in Pennsylvania.

Confirmed by TerraSol Energies
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Date Partner Type
09/25/2023
Honeywell Honeywell
Honeywell will make $27.5M investment in Iron Flow Battery energy storage systems and will purchase $300M of batteries
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Confirmed by Honeywell
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IPO INFORMATION

Date

10/12/2021

IPO status

Listed

IPO Type

SPAC

Amount

$308M

Initial shares

Ticker symbol

GWH

Exchange listed

NYSE

Prospectus URL

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Description

ESS and ACON S2 Acquisition Corp completed of their combination resulting in ESS becoming a publicly listed company. The transaction is primarily comprised of $308 million of pro forma net cash to the combined company, including private investment in public equity. The company is the US’ first publicly-traded long-duration energy storage company’.

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Date Investors Type Amount
10/12/2021 Fidelity Management & Research Company Fidelity Management & Research Company , Koch Industries Koch Industries , Tortoise Capital Resources Tortoise Capital Resources , SB Energy SB Energy , Breakthrough Energy Ventures Breakthrough Energy Ventures , BASF Venture Capital BASF Venture Capital (6)
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Energy Warehouse

50kW / 400kWh Energy Storage

 Pilot/Early Revenue Products - Retail
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