H2

H2 (H2 AEC) develops redox flow battery energy storage systems for commercial and grid-scale applications, providing long-duration energy storage solutions that address the intermittency challenges of renewable energy sources. The company's vanadium redox flow battery technology decouples power from capacity, allowing independent scaling of energy output and storage duration by adjusting the size of electrolyte tanks and cell stacks. This makes the technology particularly suited for applications requiring extended discharge durations, grid stabilization, peak shaving, and integration of variable renewable generation such as solar and wind. Redox flow batteries offer advantages over lithium-ion systems including non-flammable aqueous electrolytes, no capacity degradation over time, 20+ year operational lifespan, and the ability to deep discharge without damage. The company serves utility, commercial, and industrial customers seeking reliable, long-life energy storage for renewable integration, microgrid support, and backup power applications. Founded in 2010 and headquartered in Daejeon, South Korea, H2 has raised approximately $77 million at the Series B stage from investors including STIC Investments, K-Run Ventures, Lighthouse Combined Investment, E&Investment, DAOL Investment, and Yellowdog.