In concrete terms, GKN Hydrogen has devel-oped three storage systems: HY2MINI (up to 25 kg of hydrogen, 420 kWh of electrical storage capacity), H2YMEDI (up to 120 kg, 2 MWh), and HY2MEGA (cascadable up to 250 kg, over 8. Another advantage (particularly when compared to battery-based systems) is the long storage time: Hydrogen can be stored. Langley Holdings, a privately owned UK-based engineering and industrial manufacturing group, has acquired GKN Hydrogen, the Italian hydrogen storage and power-to-power specialist, from Dowlais Group. Based in Pfalzen, northern Italy, with subsidiaries in Germany and the USA, GKN Hydrogen is. The project, which will be located at NREL's Flatirons Campus in Arvada, Colo., uses GKN Hydrogen's storage technology to store hydrogen in a solid state (metal hydrides) compared to traditional gaseous storage tanks. Formerly part of GKN. Hydrogen Electric Propulsion is typically considered a bigger departure from aerospace norms, but fuel cell technology could offer ground-breaking opportunities to achieve zero CO2 emissions, zero NOx emissions and mitigate contrails via smart venting systems.