The Fuel Cell Electric Heavy-Duty Vehicles segmentation by type primarily comprises Proton Exchange Membrane (PEM) fuel cells, Solid Oxide Fuel Cells (SOFC), and Alkaline Fuel Cells (AFC). PEM systems dominate the market due to their rapid start‑up, high power density, and compatibility with automotive‑grade hydrogen infrastructure, accounting for roughly 70 % of total unit shipments. SOFCs, offering higher thermal efficiency and suitability for larger power packs, contribute about 20 % of the market, largely in long‑haul freight where extended range outweighs higher weight. AFCs, while less common because of sensitivity to CO₂, occupy the remaining 10 % and are typically deployed in niche applications such as off‑grid construction sites where fuel purity can be tightly controlled. Each type influences overall market size by dictating vehicle cost structures, performance envelopes, and supply‑chain requirements, thereby shaping investment decisions across OEMs and fleet operators.