ENERGIA:SVIZZERA,AEREO SOLARE ATTERA DOPO STORICO PRIMO VOLO. German test pilot Markus Scherdel steers the solar-powered Solar Impulse HB-SIA prototype airplane during his first flightover the Lake of Neuchatel near Payerne, western Switzerland, 07 April 2010. The propeller plane, with a 61 meters wingspan, is powered by four electric motors and designed to fly day and night by saving surplus energy from its 12,000 solar cells in high-performance batteries. The flight follows six years’ work by 50 engineers and technicians led by Swiss adventurer Bertrand Piccard on the so-called Solar Impulse project. ANSA-EPA/CHRISTIAN HARTMANN / POOL / LI