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Marine Renewables

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July 2011 Issue

Tritech Launches Renewables Mammal Detection System
Tritech International Ltd. (Aberdeen, Scotland) launched a mammal detection system for use near subsea turbines in May.

The Gemini SeaTec mammal detection system uses Tritech's Gemini 720id multibeam sonar along with image detection software, providing a real-time warning when sea mammals are in the vicinity of marine current turbines. Logged data can be stored for analysis and used for environmental assessment as part of the current turbine development process.

A Gemini SeaTec system is currently installed on SeaGen, a tidal turbine in Northern Ireland. Tritech has worked with the commercial arm of the Sea Mammal Research Unit at the University of St. Andrews and Marine Current Turbines Ltd. (Bristol, England) to develop the system. For more information, visit www.tritech.co.uk.

AXYS Puts Renewables Products Under Single Brand
AXYS Technologies Inc. (Sidney, Canada) in May brought its existing offshore renewable energy assessment and monitoring systems together under a single brand, AXYS Ocean Renewables. Products under the ocean renewables banner include TRIAXYS buoys, WatchMate, WindSentinel and the company's three-meter buoy. For more information, visit www.axystechnologies.com.

Initial Ocean Trials of PB150 Exceed Expectations, OPT Says
Pennington, New Jersey-based Ocean Power Technologies Inc. (OPT) in May began ocean trials of its new utility-scale PowerBuoy device, the PB150, and achieved better-than-expected initial results, the company said in late June.

During trials, wave conditions included storm waves, and electrical power generated by the PB150 peaked at more than 400 kilowatts, OPT said. An average electrical power of 45 kilowatts was generated at wave heights as low as two meters. OPT said these power levels exceeded its performance expectations for this first PB150 deployment and verifies that the system could produce up to 150 kilowatts on average with higher waves.

The ocean trials are being conducted at a site approximately 33 nautical miles from Invergordon, off Scotland's northeast coast, and are expected to last up to three months. A broad range of operations and functional tests are being performed.

The PB150 is the largest and most powerful wave power device designed by OPT to date. A second PB150 is under construction in the United States for a utility-scale project on the Oregon coast. For more information, visit www.oceanpowertechnologies.com.

Vessels, Substations Arrive at Sheringham Offshore Wind Farm
Work continues to build at the Sheringham Shoal Offshore Wind Farm off England's east coast, with additional vessels, resources and personnel arriving in May and June.

Two large offshore substations, each weighing nearly 1,000 tonnes, arrived off the North Norfolk coast in early May, and commissioning work on the two offshore substations was set to begin in June. The two substations will transmit energy generated at the wind farm to the onshore substation at Salle, England, for distribution into the national grid.

In June, the crane vessel Oleg Strashnov returned to the Sheringham site after a trip to Vlissingen, Holland, to pick up additional monopiles, and the vessel has resumed foundation installations.

A new vessel operated by Visser & Smit Hanab (Papendrecht, Netherlands), the Smit Constructor, also arrived in early June. The Smit Constructor is carrying out secondary work in support of the wind farm construction, such as installing X-beams, bellmouths, J-tubes and polyethylene pipes, which provide the infrastructure required for the connections between the turbines and the substations for electricity transfer.

As of early June, the development of the Sheringham Shoal construction involved about 400 people working offshore. For more information, visit www.scira.co.uk.

MARIN Tests Wind Turbine Concepts for DeepCwind
The Maritime Research Institute Netherland (MARIN) was in the closing stages of testing three different floating wind turbine concepts for the University of Maine-led DeepCwind Consortium, MARIN said in May.

The institute said this was the first time such an extensive scale model test campaign has been conducted for floating wind turbines, a technology considered to be the next step in development of offshore wind energy after the present generation of fixed shallow-water wind turbines.

For these model tests, MARIN and the DeepCwind Consortium worked to develop a new high-quality wind generation machine in the testing facility.

Floating wind turbines allow wind energy generation in deeper areas with more wind and more space. However, selecting the most economical platform with minimized motions is an important technical challenge. This is why DeepCwind is testing three floating models—a spar, a tension leg platform and a semisubmersible. They are an early part of the first phase of the Maine Deepwater Offshore Wind Plan, which aims to have a commercial floating wind farm in the Gulf of Maine by the year 2030, generating 5,000 megawatts of energy.

A key factor in these model tests is the presence of wind and waves simultaneously, which allows the study of the complex motions and loads of the rotating wind turbine on a moving platform in both wind and waves.

The next step of the DeepCwind consortium is to deploy a floating wind turbine design at a 1:3 scale in July 2012 off Monhegan Island, Maine, with additional designs at the 1:3 scale in July 2013. Data from these tests and the validated numerical simulation models will be available to help select and optimize the most cost-effective floating wind turbine design concept. For more information, visit www.marin.nl.

Heriot-Watt Master's Degree Offered In Marine Renewables
Scotland-based Heriot-Watt University is now offering a master's of science in marine renewable energy at its campus in Orkney, Scotland, a center of marine renewable energy activity. Applications are due September 1. For more information, visit www.icit.org.uk.

2012:  JAN | MARCH | MAY | JULY | SEPT | NOV
2011:  JAN | MARCH | MAY | JULY | SEPT | NOV

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