Letters, Daily Telegraph, 4 September Sir, There is an old saying: No one ever built a windmill if he could build a watermill. The wind is an unreliable source of power. It seldom blows steadily and sometimes not at all. The power generated by the wind varies with the cube of the wind speed. That means that if the wind speed drops from 40mph to 20mph, the power output does not drop by 50 per cent: it drops by 87.5 per cent. At 10mph, the wind produces only 1.56 per cent of the power generated by a 40mph wind. The wind can never become a major source of power.
Posted on: Sun, 02 Nov 2014 23:24:26 +0000
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