ESS Tech, Inc. (NYSE: GWH) (“ESS” or the “company”), a leading provider of safer, non-lithium energy storage solutions, today announced that it has been named one of TIME and Statista’s World’s Top GreenTech Companies 2026, marking the second consecutive year ESS has earned recognition on the prestigious list following its inclusion in 2025.

The annual ranking, developed by TIME in partnership with Statista, recognizes companies worldwide that are making significant contributions to a more sustainable future through innovative technologies, products, and services. The evaluation considers factors including environmental impact, financial strength, and innovation.

“Being recognized by TIME and Statista for the second consecutive year is a testament to the dedication of our team and the growing importance of sustainable energy storage technologies,” said Drew Buckley, CEO of ESS. “As global demand for energy storage accelerates, customers are increasingly seeking solutions that combine performance, safety, sustainability, and supply chain resilience. We are proud to be advancing non-lithium energy storage technologies that support a more secure and reliable energy future.”

ESS develops battery energy storage solutions built around abundant, responsibly sourced materials, offering an alternative to conventional lithium-based technologies. The company’s portfolio includes sodium-ion and iron flow battery systems designed to support applications ranging from grid modernization and renewable energy integration to data centers, critical infrastructure, and commercial and industrial facilities.

This recognition highlights the steps ESS has taken to diversify its energy storage solutions, including the company’s expansion into sodium-ion technology, the identification of more than $1 billion in early-stage project opportunities, the introduction of the Bridge™ modular energy storage system, and a recent customer agreement with potential to exceed 500 MWh.

The TIME and Statista ranking evaluates thousands of companies worldwide and identifies organizations that are driving meaningful progress toward decarbonization and environmental sustainability through technological innovation and commercial execution.

“Recognition for a second consecutive year reflects both the strength of our technology portfolio and our commitment to leveraging an emerging American supply chain to build energy storage solutions that address growing customer and community demand for safe, sustainable, and resilient alternatives while reducing exposure to foreign-entity concerns,” Buckley added. “We believe sustainable energy storage will play a critical role in enabling the energy transition, strengthening energy security, and supporting long-term economic growth.”

About ESS Tech, Inc.

ESS (NYSE: GWH) is the leading provider of non-lithium energy storage solutions. ESS was established in 2011 with a mission to accelerate decarbonization safely and sustainably through longer lasting energy storage. Using easy-to-source materials, ESS solutions enable energy security, reliability and resilience. We build flexible storage solutions that allow our customers to meet increasing energy demand without power disruptions and maximize the value potential of excess energy. For more information visit www.essinc.com.

Forward-Looking Statements

This communication contains forward-looking statements (including within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933, as amended) concerning the company and other matters that involve substantial risks and uncertainties. These statements may discuss the management team’s goals, beliefs, hopes, intentions and expectations as to future plans, trends, events, results of operations and financial condition, or otherwise, based on current beliefs of the management of the company, as well as assumptions made by, and information currently available to, the company’s management. These forward-looking statements can be identified by the use of forward-looking terminology, including the words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “will,” “would,” or, in each case, their negative or other variations or comparable terminology may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. These forward-looking statements, which are subject to risks, uncertainties and assumptions about us, may include our anticipated growth strategies and anticipated trends in our business. Examples of forward-looking statements include, among others, ESS’ plans for its business, ESS’ potential opportunities that approach $1 billion for sodium-ion product, the demand for non-lithium and domestic battery solutions, the timeline for ESS’ development of the Bridge product, power demands and energy storage, domestic supply chain availability, statements by ESS’ CEO, and ESS’ ability to grow and our ability to meet the growing demand for energy storage. These forward-looking statements are based on ESS’ current expectations and beliefs concerning future developments and their potential effects on ESS. Many factors could cause actual future events to differ materially from the forward-looking statements in this communication. There can be no assurance that the future developments affecting ESS will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond ESS control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements, which include, but are not limited to, the demand for our Bridge product not developing as anticipated; our ability to realize and capitalize on sodium-ion opportunities; our inability to develop our business and effectively commercialize our energy storage products; our ability to secure or maintain a domestic supply chain; inability to achieve market acceptance of our products; expansions into new markets, product lines or services; and our ability to raise capital in the near future and other risks and uncertainties described more fully in Exhibit 99.2 of the Current Report on Form 8-K filed by the Company on June 23, 2026 and the Company’s other filings with the U.S. Securities and Exchange Commission. Except as required by law, ESS is not undertaking any obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise.

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