I think this is an interesting concept except for the fact that hurricanes are a beast down here. Storms can get really bad too and I am curious as to how things will hold up during the storms.
I can't imagine Solar Power being a good idea when we have constant storms... and at unpredicitable times. One minute it will be raining, the other the sun is out shining bright. And this happens on and off all day. How do you cope with this? Solar Power does not work as well in cloudy weather and we get a lot of it regardless of our "Sunshine State" name.
I am worried and actually pretty interested all at the same time. I'm not sure who would want to live in a Solar Powered City as it is probably not as good as having good ol' fashion eletrcitiy... But FPL is a very good company and I respect them a lot. I'd say give them a shot.