January 19th, 2012 | by John Farrell
In January 2011, I plotted the size of state solar markets against their average installed cost and found surprisingly little correlation. When Lawrence Berkeley Labs put out its 2011 version of Tracking the Sun (IV), it was possible to update the chart, which I did in two stages. The first chart simply overlays the 2010 average installed cost on the original chart, with arrows indicating the movement of the prices in most states (I ran out of room in the small market states). It's almost like a rainbow rain of falling solar prices.