Company Overview

ESS Tech, Inc. is a U.S.-based energy storage company focused on the development and commercialization of long-duration energy storage systems using iron flow battery technology. The company operates within the renewable energy, grid infrastructure, and utility-scale energy storage industries. ESS designs battery systems intended to provide multi-hour energy storage for electric utilities, independent power producers, commercial and industrial customers, and renewable energy developers seeking to improve grid reliability and integrate intermittent renewable generation such as solar and wind power.

The company’s primary revenue drivers are the sale and deployment of its iron flow battery products, including the Energy Warehouse and Energy Center systems, as well as related engineering and service activities. ESS positions itself around the use of abundant and non-toxic materials, particularly iron, salt, and water, as an alternative to lithium-ion battery chemistries. The company was founded in 2011 and later became publicly traded through a business combination with a special purpose acquisition company in 2021, listing on the New York Stock Exchange under the ticker GWH. Its technology strategy has centered on delivering long-duration storage with an emphasis on safety, scalability, and reduced supply-chain exposure compared with lithium-based systems.

Business Operations

ESS generates revenue primarily through the manufacturing, sale, and deployment of long-duration energy storage systems and related services. Its operations are centered on proprietary iron flow battery technology designed for applications requiring energy discharge durations typically exceeding four hours. The company’s main commercial offerings include the Energy Warehouse platform for distributed and commercial applications and the utility-scale Energy Center platform. ESS also provides software integration, system controls, and service support associated with battery deployments.

Operations are primarily based in the United States, with manufacturing and corporate activities concentrated in Oregon. The company has also pursued international commercial relationships and demonstration projects in regions seeking grid modernization and renewable integration solutions. ESS has collaborated with utilities, renewable developers, and strategic industrial partners to validate and deploy its systems. Public filings and company disclosures reference partnerships and commercial arrangements involving energy infrastructure companies and integrators, although some announced projects remain in early deployment or demonstration phases. Data regarding the long-term scale and financial contribution of certain partnerships remains inconclusive based on available public sources.

Strategic Position & Investments

ESS has positioned itself within the long-duration energy storage market, a segment viewed as increasingly important for supporting renewable energy penetration and grid resiliency. The company’s strategy has focused on scaling manufacturing capacity, improving system efficiency and reliability, and reducing production costs through standardized product platforms. Its technology is marketed as a safer and more sustainable alternative to lithium-ion storage because it uses widely available raw materials and is designed for long operational lifespans without significant degradation.

The company has invested in expanding automated manufacturing capabilities and commercial deployment capacity at its Oregon facilities. ESS has also pursued strategic relationships intended to accelerate global market access and project development opportunities. Public disclosures and investor materials have highlighted interest in sectors including utility transmission support, microgrids, commercial energy management, and renewable integration. ESS’s technology development efforts have included advancements in electrolyte management, modular storage architecture, and grid-scale energy management systems. While the company has announced multiple customer agreements and demonstration projects, the pace of broad commercial adoption remains subject to execution, financing conditions, and broader energy storage market dynamics.

Geographic Footprint

ESS is headquartered in Wilsonville, Oregon, and its core manufacturing and operational activities are concentrated in the United States. The company’s primary commercial focus has historically been the North American energy storage market, particularly utility-scale and commercial applications tied to renewable energy deployment and grid modernization initiatives.

In addition to its domestic operations, ESS has pursued opportunities in Europe, Australia, and parts of Asia-Pacific through partnerships, pilot projects, and commercial outreach efforts. The company has referenced international demand for long-duration storage technologies in markets with increasing renewable energy penetration and grid balancing requirements. Although ESS maintains a growing international commercial presence, available public disclosures indicate that most operational infrastructure and production assets remain U.S.-based.

Leadership & Governance

ESS was co-founded by individuals with backgrounds in engineering, energy systems, and advanced materials development. The company’s leadership strategy has emphasized scaling commercially viable long-duration storage technologies while positioning ESS as a domestic supplier within the energy transition ecosystem. Management commentary in public filings and investor communications has consistently focused on grid decarbonization, manufacturing scale-up, and cost competitiveness in stationary storage markets.

Key executives and leadership figures include:

• Eric Dresselhuys – Chief Executive Officer
• Kelly Goodman – Interim Chief Financial Officer
• Hugh McDermott – Senior Vice President, Sales
• Craig Evans – Founder and former Chief Executive Officer
• Julia Song – Former Chief Technology Officer

The company operates under the governance standards applicable to NYSE-listed public companies and provides disclosures through SEC filings, including annual reports on Form 10-K and quarterly reports on Form 10-Q. Leadership and board oversight have focused on commercial execution, operational scaling, product reliability, and access to capital required for manufacturing expansion and customer deployments.