What spots you ask? Well... the spots to install photoelectric systems. This is basically a load map that shows you where people use electricity. See all the dark in the west of the US? If you install solar there you need to ship it - AKA transmit it. If you install solar right on top of the lights you don't need any transmission. So you see... Lights mark the spots to install solar and avoid shipping charges. Everybody love free shipping. I don't see a problem.