1) Hydrogen filling stations for compressed gaseous hydrogen

2) Hydrogen filling stations for liquid hydrogen

Hydrogen filling stations for filling fuel cell vehicles with hydrogen in gaseous form are used for vehicles where the hydrogen is similarly stored as a gas in the vehicle's storage tank. There are generally two standards for gaseous hydrogen stations – refilling hydrogen at 700 bar (H70) or at 350 bar (H35). Passenger cars typically use H70 technology. Filling stations using liquid hydrogen are significantly less common. Hydrogen is only in liquid form at temperatures below -252.87 °C. A liquid hydrogen filling station requires an intensive refrigeration system which is very energy and technology intensive. [26]