Japanese researchers say that they’ve discovered a simple way to make wind turbines up to three times as efficient. By placing a ‘wind lens’ around the turbine blades, they claim that wind power could become cheaper than nuclear.

Kyushu University professor Yuji Ohya spoke of the merits of the 112-meter diameter structures being able to increase energy output “two or three fold”, as well as being about to reduce the dreaded noise pollution so often associated with wind turbines, and improve safety too.

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https://www.riam.kyushu-u.ac.jp/windeng/en_aboutus_detail04.html