This page describes the available wave energy available in Efate.

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Wave Energy in Efate

The regional analysis of the cost of wave energy (See here) concluded that Efate could be suitable to support wave energy converters. Wave energy is larger on the East Coast of Efate (see image below) and previous study have identified the South Coast of Efate. This page expands the regional wave energy analysis to the whole of Efate to identify suitable offshore wave energy conversion hotspots.

Finding suitable wave energy sites

Bathymetry consideration

Efate has a bathymetry would allow the installation any type of wave energy converters. Wave energy converters can be divided in these three categories: Offshore, Nearshore and onshore devices.

Benchmark device

Wave energy converters come with different cost and efficiency. The cost of operation and maintenance and on the environment can also vary greatly and it can be very hard to decide whether Efatetapu would benefit more from one type of device at a location or another device elsewhere. It is impossible to compare the cost and efficiency of all the wave energy converters because they are not all at the same stage of development. For example, some devices only have a theoretical efficiency while other more advance wave energy converters have a measured (i.e. verified) efficiency. In order to help with decision on what device would be more suitable for Efatetapu, we calculate the cost of energy generation of one wave energy converter, the Pelamis.

From the many wave energy devices developed globally, the Pelamis wave energy converter is one of only two to have reached commercial readiness. Although Pelamis Wave Power Ltd, the firm behind the device, went into administration at the time of writing this report, the milestones reached and the research behind the Pelamis device are unprecedented and unmatched by any other device. Because of the large amount of literature on the Pelamis, it is still a benchmark and, although it is unlikely that more Pelamis devices will ever be built (at least under the same name), the device’s physical characteristics and cost evaluation can be used to probe the economic feasibility of wave energy.

Pelamis costs

Cost Type Cost range
Operation and Maintenance US$ 1.72 - 8.48 million
Total US$ 6.32 - 14.10 million

Wave Power and energy cost for pre-selected sites

Site name Mean available wave power (kW/m) Annual Pelamis power output (MWh) OM cost range (USD/MWh) Total cost range (USD/MWh)
Wave Buoy 18.7 492 140 - 689 514 - 1147
Rentapau 17.2 401 172 - 846 629 - 1405
Eton 16.1 381 181 - 890 664 - 1482
Enam 13.1 223 309 - 1521 1134 - 2532
Epao 10.7 193 356 - 1758 1311 - 2926
White Sand 9.9 142 485 - 2389 1775 - 3963

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