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Crest Energy Limited has been granted consents to construct a marine tidal turbine
power station in the mouth of the Kaipara Harbour in Northland, northern New Zealand.
The project comprises up to 200 completely submerged marine tidal turbines with
a maximum generating capacity of around 200MW, located invisibly underwater.
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Crest Energy estimates its plans when fully implemented will generate sufficient
power for an area from Albany to Cape Reinga by harnessing the energy of the tide.
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The harbour is one of the largest harbours in the world covering 900 square kilometres
with 3,000 kilometres of shoreline. The Kaipara extends for 60 kilometres north
to south.
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Tidal turbines follow similar principles to wind turbines, except that it is possible
to forecast the tides and therefore both the level of generation and the time of
day for production of power. There are about ten companies constructing tidal turbines
and others joining the industry, mainly from northern Europe and North America.
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Tidal and wind power generation have many similarities, and some differences. Since
sea water is 830 times denser than air the same velocity generates several hundred
times more power in water than in air. In addition tidal turbines are totally submerged,
invisible and silent.
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The project maintains New Zealand’s tradition of harnessing renewable energy. Over
half of New Zealand’s electricity is produced from hydroelectric, geothermal, wind
and other sustainable sources.
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Estimated total costs for the project over the first ten years are about NZ$600
million, offset by modest but growing revenues from year four.
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Kaipara tides average 2.10 metres (seven feet). The Kaipara Harbour has a temperate
climate: the average annual air temperature is 16ºC (61ºF). It is close to Auckland's
1.5 million residents, and to another large centre, Whangarei. There are readily
available routes to sell electricity using existing transmission lines durng the
earlier stages of the project.
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Many bodies are actively involved in the management of Kaipara Harbour including
Government departments, councils, community groups and tangata whenua.
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