Vestas has installed a prototype of its V150 turbine model at the Osterild test site in western Jutland, Denmark.
The 4.2MW unit is more than 200 metres tall and will now undergo a test and verification programme before entering full-scale production.
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The Danish manufacturer said it has already received orders for the turbine over 1GW in Australia, Brazil, Finland, Germany, Sweden and the US.
It is also planning to set up a V150-4.2MW production facility in Brazil.
Vestas said the model includes an upgraded gearbox, generator system and converter, as well as a new blade design and enforced blade bearings.
The 73.7-metre blades allows a 22% increase in swept area to improve energy production by 21% compared with the V136-3.45MW, it added.