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Tree root a part of wind farm’s foundation  

Foundations similar to a tree root are being used for wind turbines near Palmerston North – a first in New Zealand. Work has started on erecting 28 turbine towers at the Te Rere Hau wind farm owned by a consortium including New Zealand Windfarms.

“The foundations are smaller and smarter and reduce earthworks by about 60 percent,” said NZ Windfarms chief executive Chris Freear.

They require 40 percent less concrete than traditional gravity pad designs, he said.

Mr Freear said each turbine tower would have a single pile driven into rock. The pile would be 2.5m wide and between 7m and 10m long.

Christchurch-based Windflow Technology’s two-bladed turbines will start arriving at Te Rere Hau later this month.

There will be 97 turbines at the site on North Range Road, east of Palmerston North, when the project is complete. Five of them were installed in 2006.

NZ Windfarms hopes to have 12 turbines connected to the national grid by the end of August – producing 6 megawatts of electricity. Cabling is being laid to connect the farm with the national grid.

Te Rere Hau is a 50-50 joint venture between NZ Windfarms and Australian interests NP Power and Babcock and Brown.

Wind energy provided 2.2 percent of total electricity generation last year, according to the Economic Development Ministry.

That grew to 2.6 percent in the first quarter of this year. Wind capacity almost doubled last year to 321.7MW.

By Grant Miller

Manawatu Standard

stuff.co.nz

5 July 2008

This article is the work of the source indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

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