Years of out-of-the-box thinking have yielded a broad range of design concepts for the marine energy industry.   While the three-bladed axial flow turbine has long defined the wind industry, marine energy devices include a wide variety of concepts, including tidal turbines, wave point absorbers, river current turbines, and oscillating water columns, each of which is uniquely suited for certain operating conditions. Without one approach outperforming the others, the nascent water power indust...