Heliox Pilots Its New Flex Pro 480 kW DC Fast EV Charger with King County Metro

Why It Matters

The pilot demonstrates a scalable, high‑power solution for electrifying bus depots, accelerating transit agencies' shift to zero‑emission fleets. Its flexibility and reliability could set a new standard for dense‑site EV infrastructure.

Key Takeaways

• Heliox Flex Pro delivers 480 kW in 12 sq ft footprint.
• Supports CCS1 and pantograph charging up to 600 A.
• Powers up to six vehicles simultaneously with dynamic sharing.
• Modular design keeps charging running if a module fails.
• Available in Build America, Buy America compliant version.

Pulse Analysis

The rapid expansion of electric transit fleets has created a pressing need for high‑power, space‑efficient chargers that can keep buses on schedule. Traditional depot chargers often require large footprints and fixed power allocations, limiting flexibility in busy yards. Heliox’s Flex Pro addresses this gap by packing 480 kW into a 12‑square‑foot enclosure, enabling transit agencies to retrofit existing sites without extensive construction. Backed by Siemens’ engineering pedigree, the charger integrates both CCS1 plug‑in and pantograph interfaces, catering to a wide range of vehicle architectures and future‑proofing investments.

Flex Pro’s standout feature is its dynamic versus static power‑sharing capability. In dynamic mode, the system continuously reallocates power among up to six outlets, ensuring that any bus completing a charge can immediately free capacity for the next vehicle. Static mode, by contrast, offers predictable output for operators who prioritize strict energy budgeting. The modular power architecture further enhances reliability; if a power module fails, charging continues at reduced capacity, minimizing downtime. Additionally, the charger’s backward compatibility with existing Flex dispensers and its Build America, Buy America compliance simplify procurement for U.S. transit agencies navigating federal funding requirements.

King County Metro’s pilot will provide real‑world data on how such high‑density charging impacts fleet operations, maintenance cycles, and overall electrification costs. Successful outcomes could accelerate adoption across other metropolitan transit systems, prompting manufacturers to prioritize compact, modular designs. As cities race to meet climate goals, solutions like Heliox’s Flex Pro may become essential infrastructure, shaping the next wave of electric bus deployments and influencing policy incentives tied to rapid, reliable depot charging.