THE first detailed study of Britain’s onshore wind farms suggests some treasured landscapes may have been blighted for only small gains in green energy.

The analysis reveals that more than 20 wind farms produce less than a fifth of their potential maximum power output.

One site, at Blyth Harbour in Northumberland, is thought to be the worst in Britain, operating at just 7.9% of its maximum capacity. Another at Chelker reservoir in North Yorkshire operates at only 8.7% of capacity.

Both are relatively small and old, but larger and newer sites fared badly, too, according to analyses of data released by Ofgem, the energy regulator, for 2008.

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