Except one, maybe.

Maana’s TerraBox is “a fully automated factory capable of producing solar panels using only sand and electricity as inputs”:

Or, as Maana’s slogan says,

Sand goes in, solar panels come out. It’s as simple as that!

The TerraBox, says Maana, fits within shipping containers, allowing the TerraBoxes to be transported to deserts across the globe and produce clean renewable energy.

If TerraBoxes can really do what Maana promises, at large scale, they may indeed solve lots of energy-related problems. Except, for certain countries at least, the one I highlighted one month ago, that is energy independence.