Rimini, Italy, March 5, 2026 — Leading energy storage manufacturer HiTHIUM has marked its first official appearance at an Italian trade fair by showcasing its latest technology at Key - The Energy Transition Expo. During the event, the company publicly unveiled the 10-foot ∞Power Flexsso (3.125MWh/6.25MWh 4hr BESS), a system specifically engineered to overcome road transport weight restrictions that often hinder project deployment in constrained markets. Alongside the hardware debut, HiTHIUM presented findings and video evidence from a landmark open-door fire safety test.

Modular BESS Tailored for Logistical Challenges

The ∞Power Flexsso is HiTHIUM’s strategic response to the logistical bottlenecks faced by developers in regions with strict road freight limits. By balancing high energy density with a modular architecture, the system offers a more versatile deployment model. Each unit weighs less than 26 tons, ensuring compliance with standard road transport configurations and reducing the necessity for complex disassembly. Factory-preassembled modules further streamline the process, cutting down on-site labor and installation time to lower the total cost of ownership for developers in space-limited or transport-challenged areas.

Global Momentum and European Expansion

Reflecting on the company’s expansion, HiTHIUM VP Europe Kelson Li noted that the Italian debut follows 2025 industry rankings from InfoLink, which placed HiTHIUM among the top two global BESS providers for both total and utility-scale battery shipments. Li highlighted that the company recently shipped the industry’s first 6.25MWh 4-hour BESS to Europe. "Innovation and safety must advance alongside scale," Li stated, noting that the Flexsso and the 6.25MWh long-duration systems are particularly suited for the Italian market due to their quiet operation, reduced maintenance requirements, and enhanced safety protocols.

Passing the "Extreme" Fire Propagation Test

A major highlight of the expo was the presentation of results from a rigorous fire test conducted to meet UL9540A:2025 and NFPA 855:2026 standards. Monitored by UL Solutions, the test utilized an "open-door" configuration to maximize oxygen supply and combustion intensity—a more severe scenario than standard evaluations. Despite disabling active fire suppression to test the passive safety design, the thermal runaway was successfully contained within a single unit. Temperatures in adjacent containers remained below safety thresholds, validating the integrity of the 6.25MWh BESS architecture under extreme conditions.