I really want the US to get on board with solar in general. Parking lot solar is a good thing generally, but I don't think it should be mandatory because it's an inefficient use of resources. We don't have any shortage of rural land.

Maybe a more flexible policy could be something like: for every parking spot, you must add 1 kw of solar somewhere on your property (whether that's the parking lot or building roof or whatever is up to you) or add 2 kw of solar somewhere within a 20 miles of the site or add 3kw of solar somewhere in the US.

A lot of companies might find that the last option is the cheapest, and if that's the case we should want and encourage them to do that instead.

Feels a little gameable. I’d sell solar rights to some bit of land that I was already going to profitably adding solar to. It might still result in good incentives though.