MHK Technologies/PowerBuoy

From Open Energy Information

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Technology Profile
Primary Organization Oregon Wave Energy Partners LLC
Project(s) where this technology is utilized MHK Projects/Coos Bay OPT Wave Park
MHK Projects/Cornwall Wave Hub
MHK Projects/Griffin Project
MHK Projects/NJBPU 1 5 MW Demonstration Program
MHK Projects/Orkney
MHK Projects/Reedsport OPT Wave Park
MHK Projects/Reedsport OPT Wave Park Expanded Project
MHK Projects/Santona Wave Energy Park
MHK Projects/US Navy Wave Energy Technology WET Program at Marine Corps Base Hawaii MCBH
Technology Resource
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Technology Type
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Point Absorber
Technology Readiness Level
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TRL 9: Commercial-Scale Production / Application
Technology Description The rising and falling of the offshore waves causes the point absorber PowerBuoy to move up and down freely. The resultant mechanical stroking is converted via a sophisticated power take-off to drive an electrical generator. Sensors on the PowerBuoy continuously monitor the performance of the various subsystems and surrounding ocean environment. Data is transmitted to shore in real time. In the event of very large oncoming waves, the system automatically locks-up and ceases power production. When the wave heights return to normal, the system unlocks and recommences energy conversion and transmission of the electrical power ashore. The PowerBuoy® is an offshore wave energy converter, most of which is submerged below the water's surface. Inside, a piston-like structure moves as the PowerBuoy® bobs with the rise and fall of the waves. This movement drives a generator, producing electricity, which is sent to the shore by an underwater cable. An OPT "power plant" will consist of an array of identical PowerBuoys® that are electrically connected to provide the desired power capacity. OPT's "smart" PowerBuoy® utilizes computer-based, proprietary technologies. Technological innovations include: patented electronics systems for control and power conversion; patented wave energy conversion and transfer systems; unique generating systems that function effectively at low and variable speeds; and a modular construction process.

Mooring Configuration Each PowerBuoy is moored to the seafloor Three point compliant moorings and single point moorings are used for the Utility PowerBuoys and Autonomous PowerBuoys respectively
Optimum Marine/Riverline Conditions Utility PowerBuoys are optimized for operation in water depths ranging from 35 to 60 meters significant wave heights in the 1 to 7 meter range and wave periods in the 4 to 20 second range OPT s PowerBuoys are suitable for a wide range of wave periods due the ability to tune Autonomous PowerBuoys are designed for deep water deployment with sea states ranging from SS2 through SS5
Technology Dimensions
Length (m) 2.5
Width (m) 11
Height (m) 41
Freeboard (m) 10
Draft (m) 35
Technology Nameplate Capacity (MW) For utility uses 40kW to 150kW with 500kW in the development phase
Device Testing
Full-Scale Test •It was deployed on April 15 2011 for ocean trials at a site approximately 33 nautical miles from Invergordon Scotland Wave conditions encountered have included storm waves and electrical power generated by the PB150 has included peaks of over 400 kilowatts Average electrical power of 45 kilowatts was generated at wave heights as low as 2 meters

Relevant Technical Publications •01 - 1. US House of Representatives, Subcommittee on Energy and Mineral Resources – Testimony September 18, 2006

02 - 2. International Submerged Lands Management Conference 2006 – October 19, 2006 03 - 3. FERC Technical Conference on Hydroelectric Generation from “Ocean Waves, Tides and Currents and from Free Flowing Rivers” – December 2006 04 - 4. Initial Public Offering Road show presentations – April 2007 05 - 5. The Sustainable Energy Coalition (SEC) and the House and Senate Renewable Energy & Energy Efficiency Caucuses - Annual Renewable Energy & Energy Efficiency Expo and Forum - 2006-2010 06 - 6. Environmental Assessment (EA) for six buoys resulted in FONSI 4/2003 for OPT's US Navy project at Marine Corps Base Hawaii

Date Submitted 6/29/2011

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