The EU has agreed to the goal of deriving 15% of its electricity needs from renewable forms of energy by 2020. Using the most recent figures I could find (2011) the UK uses 344,700,000 MWh/yr of electricity which comes out to 622 watts/person/hour. (In comparison the US used 3,886,400,000 MWh/yr or 1402wats/hour/person.
Part of what the government is counting on is a solar farm is under construction and projected to provide 180,000 GWh/y that will take care of all of Scotland's energy demand and another solar farm being constructed in Leicestershire.
The thing I find most encouraging is that IKEA has announced that solar panel packages for homes will be sold in the UK as of this July, following a successful pilot project in one of their UK stores. If IKEA sells it, they will buy. :-)
Solar cells, as one would expect, do better in direct sunlight. But, today's panels also produce power from just diffused light (daylight) and not just direct sunlight.
So, if solar power is feasible in the UK where being overcast is a common thing (when it isn't raining) :-) then logic tells me the US should find it feasible, too. Maybe there is an investment opportunity here somewhere? :-)