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A fair Kop

Letters

With reference to Shot in the dark (NCE 8 January) the following should be kept in mind with regard to wind turbines:

a) It is not so much the installed capacity (MW) that counts, but the effective energy produced. Experience in the Netherlands shows that the average energy produced per year by wind turbines equals about 20% of the nominal installed capacity.

b) Where does the energy come from - and what are its costs - when a wind turbine does not function as a result of wind velocities being too high or too low?

Prof Johannes H. Kop (F), kop001@wanadoo. nl

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