Solar-Powered Yacht Cruises the Seas on Less Diesel

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

Floating House Captures Sun for Daylighting

Architect Robert Oshatz is well known for his unique approach to design and architecture. His creations are expressions of identity and form and this house boat comes as no exception. Oshatz wanted to design a house that would only function if it were situated on water, not something that could work equally well on land. The actual construction of the home had to occur offsite, on the connected Columbia River, then pulled by barge to its mooring. Also, moorings on either side were less than 10 feet away, so the house had to provide privacy despite the close proximity to neighbors.