Hydrogen-powered aircraft could make up 38% of all aircraft by 2050, representing 34% of the sector’s overall energy needs, according to a new McKinsey report.

Alternative propulsion could require between 600 and 1,700Twh-hours of clean energy by 2050, globally, which is equivalent to the energy generated by around 10 to 25 of the world’s largest wind farms or a solar farm the size of Belgium, the report states.

About 89 to 96% of the energy would be used for hydrogen-powered aircraft, while only 4 to 11% would be used to power smaller battery-electric-powered aircraft, such as turboprops, regional jets, and smaller narrow-body aircraft.