On a quiet street in suburban South Salt Lake City, Utah, the stirring of an energy revolution is taking shape. There, outside the spare bedroom of an unassuming, thousand-square-foot midcentury home sit three angled solar panels plugged into a nearby outlet.Unlike the highly technical and expensive hurdles required to install a large rooftop solar system, the setup on Andrew Leon and Victoria Mauro’s lawn is small, portable, and cheap. The unit generates enough electricity to run laptops, light...