The vertical design and smart tracking functions of the towers offer big improvements over flat panel arrays.

Currently, most solar farms consist of flat panels laid out across the ground or on rooftops. But in much the same way that this is an inefficient way to house people, it's also not a great way to harvest the Sun's energy. Tall skyscrapers can hold significantly more people on a small footprint, so why not apply that thinking to solar panels as well?

That's the kind of thinking that has been behind the success of Janta Power, a developer of unique three-dimensional solar tower systems. And the new injection of cash shows that there are investors who think that this company is on to something.