ESS Tech, Inc. (ESS) (NYSE : GWH), a leading manufacturer of iron flow long-duration energy storage (LDES) systems for commercial- and utility-scale applications, today announced that it will hold a conference call on Thursday, August 14, 2025 at 5:00 p.m. EDT to discuss financial results for its second quarter 2025 ended June 30, 2025.

The news release announcing the second quarter 2025 financial results will be disseminated on August 14, 2025 after the market closes.

Interested parties may join the conference call beginning at 5:00 p.m. EDT on Thursday, August 14, 2025 via telephone by calling (833) 470-1428 in the U.S., or for international callers, by calling +1 (404) 975-4839 and entering conference ID 271308. A telephone replay will be available until August 21, 2025, by dialing (866) 813-9403 in the U.S., or for international callers, +1 (929) 458-6194 with conference ID 482125. A live webcast of the conference call will be available on ESS' Investor Relations website at http://investors.essinc.com/.

A replay of the call will be available via the web at http://investors.essinc.com/.

About ESS Tech, Inc.

At ESS (NYSE:GWH), we deliver safe, sustainable, long-duration energy storage to ensure energy abundance and security. As energy demand continues to grow, our solutions provide essential reliability and resilience to people, communities, and businesses in the United States and throughout the world. Our technology uses earth-abundant iron, salt and water to deliver environmentally safe solutions capable of providing 10+ hours of flexible energy capacity for commercial and utility-scale energy storage applications. Established in 2011, ESS enables project developers, independent power producers, utilities and other large energy users to deploy reliable, sustainable long-duration energy storage solutions. For more information, visit www.essinc.com.

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Investors:

Erik Bylin

investors@essinc.com

Media:

(855) 423-9920

ESS Schedules Second Quarter 2025 Financial Results Conference Call