Those horizontal wind turbines just got more feasible

What I liked about this article is that it explains in simple terms what the engineering difficulties have been for this family of wind turbines.
Here' the bit that draws me in:

It may resemble a giant rotary washing line, but it might just help Britain meet its hugely ambitious new wind energy targets. At least that's the claim of the company developing a novel "vertical axis" wind turbine dubbed the Aerogenerator.

The 144-metre high V-shaped structure would be mounted offshore and capable of generating up to 9 megawatts of electricity, roughly three times as much power as a conventional turbine of equivalent size. Switching to such a design could ensure that thousands fewer turbines would be needed in order to meet the government's new wind power target, says Theo Bird, founder of Windpower, the Blyth-based firm behind the new turbine.

As unique as it may sound, the Aerogenerator is in fact just the latest addition to a family of wind turbines that generate power through a rotating vertical shaft as opposed to the horizontal shafts of the more familiar windmill design.