A 10 MW commerical plant such as the one at the left costs about 24 cents/kWhr.  This is in keeping with projections that module cost would be about $3.00 now. In The price will fall gradually to 6 cents over the next 20 years.  Between now and most homes in the south will have all there energy needs met with rooftop solar, and by then even Seattle is capable of being solar powered at rates similar to today.