Why giant turbines are pushing the limits of possibility

Next year, Danish wind turbine manufacturer Vestas will put up a gargantuan prototype - a 15-megawatt (MW) wind turbine that will be powerful enough to provide electricity to roughly 13,000 British homes. It will be the biggest such turbine in the world, though potentially not for long. Wind turbines just keep getting bigger - and it's happening faster than almost anybody predicted.
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