Wind turbines attached to houses generate on average one-tenth of the electricity they would in optimal conditions, research has found.

A two-year study of 133 sites by the British Electrotechnical & Allied Manufacturers Association will encourage supporters of large-scale wind farms in more productive locations and comes a week after a government u-turn over the merits of microgeneration.

Ivan Ball, director of sustainability consultancy Bluesky, said: 鈥淭his shows that renewables built off site have got to be the way forward.鈥�

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