Esolar's 5 MW Sierra SunTower installation covers 20 acress and will provide power "up to 4,000 homes". Their panels track the sun using a patented heliostat system (Photo: eSolar)
Recently the Cleantech Group, with the assistance of an advisory panel of corporate executives, sat down to decide upon the third annual Global Cleantech 100: the hundred "most promising and innovative" clean technology companies of 2011. The listed companies span a range of industries, and though solar energy firms, chemical recyclers, LED manufacturers and energy-monitoring software programmers certainly aren't under-represented, many companies in the hundred are defined by a single product or idea. Gizmag scoured the Cleantech 100 to find what we thought were the ten most innovative companies.