Six states got 10 percent or more of their power from wind, solar and geothermal power in 2011. That's double the number from just a year ago. Not bad for a down year. CleanEdge released its State Clean Energy Index on Wednesday, tallying up the state of green energy and technology across the 50 states of the union as of the end of 2011. Among the milestones, the Portland, Ore.-based research firm marked a doubling in the number of states that have 10 percent or more of their utility power coming from renewable sources, not including hydropower. The list included South Dakota at 22.3 pe...