SkyLifters use sun and wind energy to fly.
The upper surface of the aerostat is the perfect place for solar collectors.
SkyLifters can drift with the wind, with thrust-off and using just a trickle of energy to power life-support, avionics and essential systems. Used when conditions permit, this is another major advantage of SkyLifters over their heavier-than-air, winged cousins.
Overall, SkyLifter’s cost per tonne-kilometre is exceptionally economic. This is mainly because energy is used for propulsion, not for lifting. SkyLifter’s are permanently floating, so their payload transport efficiency is more similar to sea ships than to aircraft.