More recently Marlec has diversified into water current turbines -- another renewable energy technology which has great potential in rural Africa and South America, especially along the tributaries and upper reaches of the Nile and Amazon rivers. The operating principles of water current turbines are very similar to those of wind turbines, but they can operate at much lower stream velocities, as the density of water is roughly 800 times the density of air -- and power is proportional to density. Water turbines, therefore, have cut-in water speeds around 0.4 m/s, and they furl at around 1.5 m/s -- about half the cut-in speed of a typical wind turbine.
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