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Beyond Lithium, Part 2: ESS Tech’s Iron Flow Battery (6.3.2026)

Brief

ESS Tech, Inc. delivered a webinar presentation on June 3, 2026 (moderated by Seth Mullendore) where CEO Drew Buckley reviewed the company’s iron flow long‑duration battery technology, deployment roadmap and multiple projects—highlighting a 5 MW/50 MWh Florence, AZ system with Salt River Project—and contrasted lifecycle, safety, cost, scalability, and supply‑chain benefits versus lithium‑ion for grid resilience.

Why it matters

ESS Tech, Inc. manufactures iron flow long-duration energy storage; CEO Drew Buckley presented on 2026-06-03 and detailed multiple projects in development, including a 5 MW / 50 MWh system in Florence, Arizona with utility Salt River Project.

Key details

  • The webinar (moderated by Clean Energy Group President Seth Mullendore) compared iron flow performance, cost, scalability, safety, and supply-chain advantages as a non‑lithium option to strengthen grid resilience and support long‑duration needs.
Source evidence

WEBINAR SLIDES: https://www.cleanegroup.org/wp-content/uploads/webinar-6-3-2026-slides.pdf

Clean Energy Group’s “Beyond Lithium” webinar series spotlights the emerging energy storage technologies that are expanding the grid’s capabilities beyond today’s lithium-ion batteries. Each session in the series will feature a leading non–lithium-ion storage company, offering a practical look at how their systems work, where they are being deployed, and how they compare on performance, cost, scalability, safety, and supply chain considerations. Participants will gain insight into the potential benefits, barriers, commercialization timelines, and policy frameworks shaping this evolving market.

This session explored ESS Tech, Inc., a leading manufacturer of iron flow long-duration energy storage systems with multiple projects in development, including a 5 megawatt / 50 megawatt-hour battery system in Florence, Arizona with the utility Salt River Project. ESS’s Chief Executive Officer, Drew Buckley, gave an overview of their technology and answered questions from attendees. Clean Energy Group President and Executive Director Seth Mullendore moderated.

Join us to better understand how diversifying storage technologies can strengthen grid resilience, advance energy affordability, and accelerate an equitable clean energy transition.

Channel: Clean Energy Group / Clean Energy States Alliance
Published: 2026-06-03
Video URL: https://www.youtube.com/watch?v=-3EHvAFK3Kg