UK CAA expands Hydrogen Challenge

February 3, 2025

The UK Civil Aviation Authority has expanded and extended its Hydrogen Challenge, launching a second round to drive the development of hydrogen-powered aviation.
The initiative will now run for three years, enabling further progress in hydrogen propulsion testing, airport infrastructure innovation, and aircraft system advancements.
The challenge aims to prepare the aerospace sector for the widespread adoption of hydrogen as a zero-carbon aviation fuel. Multiple UK companies are working alongside the regulator to develop the technology and infrastructure.
A significant focus of the initiative is the development of new aircraft designs that incorporate hydrogen fuel cell-powered systems, alongside efforts to implement necessary changes to airport infrastructure.
These improvements include refuelling and storage solutions to facilitate the safe and efficient use of hydrogen at airports across the country. Research led by aeronautical institutes is also underway to deepen understanding of hydrogen combustion and its application in aviation technology.
Tim Johnson, director of Communications, Strategy and Policy at the UK Civil Aviation Authority, said: “These trials keep the UK on course to be a world leader in hydrogen propulsion.
“We are working with some of the most innovative companies and minds to better understand this technology and how it might be introduced safely in the aerospace sector.
“In doing so, it offers the potential to enable a more sustainable aerospace system and support UK economic growth.”
Several industry leaders are actively contributing to the Challenge. Cranfield Aerospace Solutions is testing hydrogen fuel cell electric propulsion systems, while Oxford University is investigating the scientific complexities of hydrogen combustion in gas turbines.
ZeroAvia is working on safe hydrogen fuel storage, distribution, and refuelling solutions, and Rolls-Royce is exploring gas turbine designs compatible with net-zero fuels.
Additionally, Exeter Airport is conducting trials to assess different approaches to hydrogen storage and refuelling, and Project 601 at Heathrow Airport is establishing an airside test-bed for hydrogen fuel handling and operations, with support from Cranfield University.
The expanded Hydrogen Challenge is expected to yield findings that will shape future regulations and ensure the safe adoption of hydrogen aviation technology.
With trials set to continue until 2028, the UK aims to position itself as a leader in the global transition toward zero-emission air travel. Results from the 2024 Challenge will be published soon.