Leading provider of hydrogen-electric solutions for aviation ZeroAvia is collaborating with its strategic investor Shell, who will design and build two commercial-scale mobile refuelers for use at ZeroAvia’s research and development site in Hollister in California. At ZeroAvia’s test facility in Hollister, Shell will also provide compressed, low-carbon hydrogen supply to the facility and other locations in the Western US. This strategic collaboration will support the development of ZeroAvia’s flight testing program in the US following the arrival of its second Dornier 228 at Hollister last month and will advance the company’s Hydrogen Airport Refueling Ecosystem on a larger scale.ZeroAvia’s zero-emission powertrains use hydrogen fuel in a fuel cell to create a chemical reaction which produces electricity. That electricity then powers electric motors that spin the propellers, while producing no emissions other than water.The announcement follows recent positive predictions relating to the falling price trajectory of hydrogen fuel and a flurry of State-led activity for establishing H2 Hubs as the Department of Energy prepares to receive bids from across the US.ZeroAvia will begin flight-testing its ZA600 hydrogen-electric powertrain this summer using its two Dornier-228 testbed aircraft, first in the UK, and later replicating this work on the US-based demonstrator. The development of this 600kW powertrain is part of Project HyFlyer II and will deliver a fully certified powertrain for aircraft of up to 19-seats by 2024. HyFlyer II is supported by the UK Government’s Department for Business, Energy and Industry Strategy, Aerospace Technology Institute and Innovate UK through the ATI Programme. The company is also now retrofitting a second Dornier-228 testbed in Hollister in California to conduct further flight testing.