ESS Tech, Inc. (GWH) Earnings Call Transcripts

ESS Tech, Inc.'s Latest Earnings Call - June 3, 2026

In the Q1 2026 earnings call for ESS Tech, Inc. (GWH:US), management highlighted significant progress in commercializing their long-duration iron flow battery technology. The company reported revenue of $10 million over the past four years, with expectations for a substantial increase due to new contracts, including a flagship project with Google and Salt River Project. Management maintained a cautious outlook, emphasizing the need for technical design completion and commercial viability before scaling production, with anticipated deliveries starting in late 2027.

Reported metrics

Guidance from management

Management indicated that they are focused on completing technical design work and achieving commercial viability before scaling production, with initial deliveries expected in late 2027.

What management said

Yes. We -- there's a wide range that we tested in the lab, but I'd say in the high 60s is where we think about our roundtrip proficiency for the energy base that we're trying to -- that we're hoping to send to customers in -- or that we're working towards sending to customers in late 2027. So high 60s round trip efficiency, I think theoretically, we can go into the low 70s. But everything in our research says that hi...

What analysts pressed on

Analysts expressed concerns regarding the technical design challenges and the timeline for commercialization. There were questions about the competitive landscape and how ESS Tech's technology compares to other long-duration storage solutions.

Main topics on the call

• Commercial Contracts and Partnerships — ESS Tech has signed contracts with notable customers, including Google and Salt River Project, with a total contract value of $50 million expected to deliver between 2026 and 2028. CEO Drew Buckley stated, "These are rea...
• Market Demand for Long-Duration Storage — Management identified a growing market for long-duration energy storage, driven by increasing electricity demand, particularly from AI-focused data centers. Buckley noted, "Global energy storage demand is projected to ex...
• Technical Design and Commercial Viability — Management emphasized the importance of completing technical design work to ensure commercial viability. Buckley mentioned, "The biggest hurdle for us right now is just completing the technical design and commercial viab...
• Manufacturing Capacity and Scalability — ESS Tech currently has 100 megawatts of manufacturing capacity and plans to scale up significantly. Buckley indicated, "If we fill up our current 100 megawatts, we could definitely hit those cost numbers."

Read the full ESS Tech, Inc. transcript (June 3, 2026) → Summary generated from the call transcript; every figure above is stated by management on the record.

Earnings Call History

EarningsCalls.dev has 17 ESS Tech, Inc. earnings call transcripts on record, spanning March 1, 2023 to June 3, 2026. Based on this history, ESS Tech, Inc. reports quarterly. The most recent call on file is dated June 3, 2026. The full list is below — each row opens the complete, free-to-read transcript.

Ticker

GWH

Exchange

NYSE

Country

US

Sector

Industrials

Industry

Electrical Equipment

Calls on record

17

First call

March 1, 2023

Most recent

June 3, 2026

Reporting cadence

quarterly