PowerBuoy Ocean Power Technologies, Inc. are point absorbers, with a linear generator for a power take-off system. The “smart” buoys, based on integrated patented hydrodynamics, electronics, energy conversion and computer control systems, capture and convert energy from the natural rising and falling of waves into low-cost, clean electricity. The generated power is transferred ashore via an underwater power transmission cable.
OPT’s latest version is its PB150 PowerBuoy. This 150 kW PowerBuoy is being fabricated in Scotland and will be deployed in 2010 at the European Marine Energy Centre in Orkney Isles, Scotland. A second PB150 PowerBuoy is also planned to be ready for deployment in 2010 as the first of ten PowerBuoys at Reedsport, Oregon. The deployment of these two PowerBuoys in the Atlantic and Pacific Oceans will mark a milestone in the company’s commercial development, as it will be the first time two of the same scale utility PowerBuoys are deployed in multiple locations.
The PB150 PowerBuoy will generate power with wave heights between 1.5 and 7 meters (4.9 to 22.9 feet). OPT’s mooring approach and PowerBuoy structure permit deployment of the PowerBuoy system across a wide combination of storm wave, tidal, and current conditions, making it suitable for many wave climates. The PB150 is typically configured in two to three row arrays, minimizing the footprint of the project.
The PB150 PowerBuoy offers a sustained maximum peak-rated output of 150 kW and a power factor of -0.9 to +0.9. Typical capacity factors for the PB150 are between 30% to 50%, depending on location.
OPT has also developed an Underwater Substation Pod (USP) for which a patent is pending, which can aggregate the electrical output from up to ten (10) PB150 PowerBuoys into a single transmission cable to shore. This approach minimizes costs of submarine transmission cable to the shore based interconnection. The USP provides control and SCADA capability for all connected PowerBuoys.
A future 10-Megawatt utility power station consisting of floating PowerBuoy systems would occupy approximately 30 acres (0.125 square kilometers) of ocean space. Such a plant would generate electricity for approximately 4,000 homes.
– from greencarcongress.com