The useful question is what changes for users, developers or buyers, and whether the announcement stays industry context or becomes something people can actually use.

ESS Tech, Inc. announced the release of a final report from Burbank Water and Power, conducted under the APPA’s Demonstration of Energy & Efficiency Developments program, which evaluated an ESS Energy Warehouse system over 21 months. The report concluded that ESS’ iron flow battery technology is viable for utility-scale energy storage, successfully operating alongside solar resources. Utility personnel were trained in system operation and maintenance, supporting broader industry education on long-duration storage solutions.

The report emphasized the technology’s reliance on iron, salt, and water, highlighting its non-flammable chemistry, domestic manufacturing, and long projected lifespan. ESS CEO Drew Buckley noted the project’s role in validating the company’s core technology strengths, including long-duration performance and safety, which are central to its next-generation Energy Base product.

Burbank Water and Power General Manager Mandip Samra stated the project demonstrated that safe, long-duration battery alternatives can support grid reliability and zero-carbon energy goals. The utility collaborated with APPA to assess the technology’s potential for future energy storage needs, reinforcing the viability of iron flow systems in utility applications.

The findings align with ESS’ broader commercial initiatives, including projects with Salt River Project in Arizona and the United States Air Force Research Laboratory. ESS, established in 2011, focuses on delivering long-duration energy storage solutions to enhance grid stability, renewable integration, and energy resilience for utilities and industrial customers.