First Installation Site Garden Island WA

The first full scale CETO devices will be deployed in an area near Garden Island off the coast of Western Australia as in Fig. 27.3.

This is ultimately the planned site for a 5 MW wave farm comprising multiple CETO units that is expected to be one of the first (if not the first) commercial scale wave farm in the southern hemisphere. Grid connected power is expected to be available by 2012.

The site is located in the Sepia Depression, an area of 20-25 m water depth between Five Fathom Bank and Garden Island. Garden Island houses HMAS Stirling, which is the Royal Australian Navy's largest base. A memorandum of understanding has been signed with the Australian Department of Defence for collaboration, onshore space and potential power off take. The site is connectible into the Western Australian transmission grid (SWIS) via the facilities at Garden Island.

The site was chosen because of its proximity to the port of Fremantle and marine support facilities in and around Cockburn Sound, as well as the ready access to the SWIS and the population centre of Perth. The wave resource is > 35 MW/km on site with approximately 65% availability of 2 m waves and 90% availability of 1 m waves. The presence of Five Fathom Bank provides some sheltering from excessive swell waves while still maintaining a viable wave climate for a commercial wave farm. Significant wave height (Hs) inside the bank is limited to 4 m, compared to 8 m outside, due to the attenuation effect of bank. The Sepia Depression location has a similar average wave climate to a fully exposed location outside of Five

Fig. 27.3 Garden Island site

Fathom Bank. Another advantage of the Sepia Depression is that it has a greater predictability of the sea state due to the sheltering effect and this translates to increased site accessibility.

The first phase of full scale insitu evaluation will involve a single autonomous CETO unit. This installation will be used to gather performance and reliability data as well as validate storm survivability measures. A Waverider® buoy is anchored adjacent to the CETO mooring, and both the Waverider® data and the outputs from the WEC will be beamed back to shore via wireless link. Energy produced by the unit will be safely dispersed as heat into the surrounding seawater.

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