Sea Technology

APR 2014

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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22 st / April 2014 Installation is a Costly, Challenging Process The technology allows the turbine to be installed or un- installed in just 30 minutes (using relatively small boats), maximizing the time it spends producing electricity and minimizing the cost of deployment and maintenance for the operator. On site, it uses a patented winch and clamp design that winches the nacelle down to its seabed support structure and locks it in place. The system avoids the need for special- ist high-capacity lift vessels and for divers. Another major competitive advantage for the turbine stems from the way the system yaws. Tidal streams do not always turn through 180°. As the tide turns four times each day, the turbine has to be able to turn with it, positioning itself to face directly into the fow at the optimum angle to extract the maximum energy potential. This also means that the initial placement of the founda- tion does not have to be perfectly aligned with the tidal fow. Alstom has established an integrated ocean energy busi- ness that can contribute in the early development of the tidal industry. Alstom's 1-megawatt tidal turbine installed at the EMEC site in Orkney, Scotland. AprilBook.indd 22 4/7/14 12:19 PM

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