The concept has a number of important advantages over existing supertankers including reduced operating cost, good scalability, a fast development time, and is vastly more environmentally "sensitive". A green Unmanned Ocean Vehicle (UOV) specifically suited for persistent ocean surveillance for military, oceanographic, and commercial applications is also in the works.
SolarSailor Aquatanker III
The Aquatanker, by Australian company Solarsailor, is a concept “green” supertanker designed to transport large volumes of potable (i.e., drinkable) water. The 400 m by 31 m vessel will sail at 15 knots (about 28 km/h) using a solar wing sail with solar cell array technology, providing renewable energy and reducing fuel consumption and emissions by nearly 50% compared to an otherwise similar conventional tanker. The Aquatanker will use Hybrid Marine Power technology, much like the engine of a modern hybrid car, combining electric drive with the power and range of hydrocarbon fuel.
More information and images from the Solarsailor website.