Thanks to its innovative hull design, the WHY solar-powered yacht requires less power at cruising speed than a boat of equal size. Its diesel-electric propulsion is the most efficient motorization today, and the surface of the photovoltaic panels - almost 900 square meters - covers most of the boat’s auxiliary system needs.
Its PV power is estimated to save up to 200 tons of diesel per year. http://www.solaripedia.com/13/200/roof_goes_electric_on_solar_why_yacht.html
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