There is no restriction to install PV panels here.
I am big advocate of solar, but when looking at the cost in installation including a Federal 30% tax rebate it still takes a long time to re-coop that investment.
Of course the other side of the coin is that doing so is better for the environment in reducing your carbon foot print, but the first thing to do is ban gas golf carts
Now if the state would give us incentives that would change things.