The 5 US states with most wind and solar saw least electricity inflation 2005-2010.

Climate Progress: “On average, rates in these states increased by 1.35¢/kWh over five years (or 3.2% annually).  The bottom five states were the only states to have each installed less than 1 MW of cumulative solar PV and wind capacity through 2010.  On average, rates in these states increased by 1.39¢/kWh over five years (or 4.0% annually).  On average across the U.S., by comparison, electricity prices increased by 1.8¢/kWh over five years (or 4.1% annually).”