NASA has awarded the single largest prize handed down  in aviation history to Team Pipistrel-USA.com for designing and  demonstrating its Taurus G4 electric aircraft. Per the rules of the  NASA- and Google-sponsored CAFE Green Flight Challenge, Pipistrel’s  Taurus G4 covered 200 miles in less than 2 hours and did so on the  electricity equivalent of less than one gallon of fuel per passenger,  scoring $1.35 million for the effort.
But the cash, substantial though it may be, is only part of the story  here. The CAFE (that’s Comparative Aircraft Flight Efficiency)  Challenge was created to push aircraft engineers toward new, more  efficient airplane designs that would perhaps usher in a new era of  ultra-efficient flight, based on either electric engines or extremely  efficient fuel-burning engines.So while you can argue the day belongs to Pipistrel--and we certainly  don’t mean to diminish that achievement--the CAFE Foundation and NASA  are the real winners here. Consider: The challenge asked teams to  average 100 miles per hour over two hours, and to do so on the  equivalent of one gallon of gas. Not only did Pipistrel manage this, but  so did California-based e-Genius with its electric-powered plane (for  which it netted a second place prize of $120,000).
The kicker: both teams did so on just a little more than a  half-gallon of fuel equivalent. That means both Pipistrel and e-Genius  did twice as well as NASA and CAFE asked them to do (and Pipistrel  slightly better than e-Genius, hence the distribution of prizes).
That’s pretty amazing, considering that just a few years ago  engineers were still trying to figure out how to get an all-electric  powered plane into the air for any considerable length of time, much  less at sustained triple-digit speeds and while using very little  energy.
Our jetliners aren’t going green just yet of course. But the winning  teams in the CAFE Green FLight Challenge collectively spent just two  years and $4 million on two aircraft that have pushed the electric  airplane field forward by a considerable step. Imagine what ten years  and some serious investment might do for the electric aircraft space. 
by "environment clean generations"
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