I recently saw a very interesting crowdfunding campaign for Solar Roadways. The basic idea is to replace the US roads with solar panels. The surface is textured glass, which protects the solar cells, and there will also be LED lights that will act as configurable lane dividers or other markers. Heating elements can be included as well, keep the panel just above freezing, reducing the need for road salt.
Obviously, being solar cells, they will generate their own power to fuel the lights and heating elements, and the excess power can be hooked into our aging electrical grid.
The inventors have grand claims to replace the entire power infrastructure and decentralize the grid, which to me sounds like a stretch, but IMO its at least a step in the right direction
I've linked their page below. There you can get some more info, look into the FAQ page for answers, and there is even a link to a page with actual numbers and calculations (its not a scientific publication or anything, but at least its there).
https://www.indiegogo.com/projects/solar-roadways