Solar Ship is one fuel-efficient blimp

There is one thing that I like to see in the air, and that is blimps. This Solar Ship makes me like them all the more, because it is one very green thing in the wild blue yonder.
As you might have guessed, the Solar Ship is solar-powered. I’m sure you know that blimps stay in the air because the helium makes them lighter than air, but something has to propel them. Why not have solar-powered lithium-ion battery that fuels the propellers?
The Solar Ship can travel up to 600 miles with two tons of payload. You can watch a video of it after the jump, and you can see that it doesn’t require too long of a runway for takeoff and landings. This is important for situations for when you need a craft that can land in tight spots, like areas hit by a natural disaster. Sometimes you just need to be airlifted out, and the Solar Ship is the craft to do it, and probably more fuel-efficient than a helicopter.
As you can see from the video, the Solar Ship is a working craft, but the company won’t be doing public demonstrations until next year. By then, the Solar Ship will be in three different sizes, but I don’t have any word on how much cargo they can bear.