Energy News: Cleantech America is planning the world's largest solar farm, at 640 acres, for completion in 2011 in Fresno, California. At 80 megawatts, that would dwarf the current largest solar farms in the 4-5 megawatt range. "We're pretty confident that solar farms on this scale are going to have an industry-changing impact... This scale of project, I think, creates a tipping point for renewable energy," Cleantech CEO Bill Barnes said. CNN has the details.