The Cooler Planet folks made a great visualization. It’s a time-lapse Google Maps heat-map (that’s a mouthful!) of the solar installation inquiries they’ve received over the last 2 or so years. It’s quite interesting to see where the most solar installs are going (many in predictable places like SoCal, others not so much).
Here it is (if you’re reading this in Tumblr’s Dashboard, click on through to check it out):
More solar energy information.