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Solar modules now selling for less than €0.06/W in Europe
(www.pv-magazine.com)
This is a most excellent place for technology news and articles.
Rooftop units might not be the least expressive, but they are absolutely the way to go. The less we rely on the utilities, the more demand we take off of their adding grid, that they refuse to upgrade. It also means more energy independence. A friend of mine has a small rooftop setup that has completely offset his electricity isn't to the punt that he bought a plugin hybrid that never goes out battery for his day to day travels and costs him nothing to charge.
If you want energy independence, push for community solar. Neighborhoods or municipalities get together to own their own solar field. Then you get a measure of independence while also taking advantage of economies of scale.