The five states with the highest installed capacity are Texas, California, Iowa, Minnesota, and Oregon. By the end of 2010, these states had installed a cumulative 22.4 GW of wind and solar PV.
On average, rates in these states increased by 1.35˘/kWh over five years (or 3.2 percent annually)
The five states with the lowest installed capacity are South Carolina, Louisiana, Kentucky, Mississippi, and Alabama. By the end of 2010, these states had installed a cumulative 0.001 GW of wind and solar PV.
On average, rates in these states increased by 1.39˘/kWh over five years (or 4.0 percent annually)
On average across the U.S., by comparison, electricity prices increased by 1.8˘/kWh over five years (or 4.1 percent annually)
http://cleantechnica.com/2011/12/20/5-states-with-most-solar-wind-energy-had-smallest-increase-in-electricity-prices-2005-2010/