The FPL page also says 42000mwh is enough to power 3000 homes for a year. IOW, the average house uses 14mwh / year, or about 38kwh / day.
If a panel operates usefully four hours a day on average, an average house would need about 35 panels plus a hefty battery bank, an inverter, and control electronics.
There's a guy who posted an article on how to make a 60-watt panel for about $100, not including batteries and inverter and labor. It was to power his remote campsite in Arizona. He wrote another article on how he made a windmill using sliced PVC tubing for the turbine blades. Oh, well. A start.
Why waste time even reading about it?
That's just enough power to drive four CFLs during the daytime (if you're lucky) when you don't need the light.
Wonderful!