B2.0 editor Jeff Davis at Waterlog has this item on new hybrid diesel/solar-powered ferries that will take San Francisco tourists to Alcatraz, starting in 2008:
Hornblower is working with Solar Sailor of Sydney, Australia, to construct two 600-passenger trimarans for Alcatraz (at a cost of between $6 million and $8 million apiece) that will run as much on sun and wind power as they do diesel fuel—and will emit half the pollutants of a similar sized conventional ferry. Service is scheduled to start in 2008, and a second vessel is on order for 2011.
The slickest feature? The triple-hulled vessel will have a 45-foot high retractable wing covered in solar panels that can generate 20 kilowatts of electricity to help take the load off the two diesel engines. The wing also generates some 170 hp on its own as a sail.
That's what I call a real solar sail.