New ESS Inc. white paper analyzes growing market potential for long-duration energy storage

April 11, 2018

Industry survey reveals maturing market in which Levelized Cost of Storage (LCOS) calculations provide best insight to informed choice of long-duration battery technologies.

 PDF of Release

| new ess inc. White paper analyzes growing market potential for long-duration energy storagePORTLAND, OREGON – April 11, 2018 – ESS Inc., a leading manufacturer of safe, low-cost and long-duration energy storage systems, announced today the release of its “Further Beyond Four Hours” white paper on long-duration energy storage. The comprehensive report defines and evaluates the growth potential for long-duration storage in the maturing energy market, and confirms flow batteries as the most promising technology for long-duration storage applications.

Key highlights from the report include:

  • Long-duration storage is now commonly viewed as having an energy delivery time of at least four hours, and the need for it is growing.
  • Renewable energy self-consumption is seen as the most promising application for long-duration storage.
  • A Levelized Cost of Storage (LCOS) calculation is considered the most reputable selection criterion in determining which long-duration storage technology to deploy.
  • The most promising technology for long-duration storage is flow batteries and the key criterion for selecting a given asset is cost, particularly the capital expense required.

“We believe there is a strong case to be made for long-duration storage solutions, especially for renewables integration – and that the market is looking for alternatives to lithium-ion,” said Craig Evans, founder and CEO of ESS Inc. “The challenge is how to make an informed business decision when faced with an abundance of information and claims. As our survey showed, the highest percentage of decision-makers believe that Levelized Cost of Storage is the most reliable factor.’”

“Further Beyond Four Hours combines in-depth survey results and research with insights from energy storage analysts, consultants, vendors and project developers, as well as engineering organizations and other industry groups.

Those interested in the free report can download “Further Beyond Four Hours by visiting

About ESS Inc.

Established in 2011, ESS Inc. develops and manufactures the low-cost, long-duration Energy Warehouse (EW) flow battery for commercial and utility-scale energy storage applications requiring 4+ hours of flexible energy capacity and 20+ years of operating life with no capacity fade. The EW utilizes earth-abundant iron, salt, and water for the electrolyte, and delivers an environmentally safe, long-life energy storage solution for the world’s renewable energy infrastructure with the lowest levelized cost of storage per kWh. For more information, visit


Links to third-party articles and/or websites are for general information purposes only and the content of any third-party article or website is solely the responsibility of the author, owner, operator or publisher of that article and/or website. Views expressed in third-party articles and/or websites reflect the opinion of the author, owner, operator or publisher as of the date of publication, and not necessarily those of ESS Tech, Inc. ESS Tech, Inc. has not independently verified such content, makes no warranties, representations or undertakings relating to such content, and bears no responsibility for the accuracy, legality or content of any external site or for that of subsequent links. Any reliance you place on such information is strictly at your own risk. You are encouraged to read and evaluate the privacy and security policies on the specific site you are entering. ESS Tech, Inc. disclaims any loss, damage and any other consequences resulting directly or indirectly from or relating to your access to the third-party website or any information you may provide or any transaction conducted on or via the third-party website or the failure of any information, goods or services posted or offered at the third-party website or any error, omission or misrepresentation on the third-party website or any computer virus arising from or system failure associated with the third-party website.