Really alternative energy: underwater kite turbines

The kite, which at full size will have a wingspan of 8-14 metres, carries a turbine below it. The kite is tethered by a cable to the sea floor and then “flies” in the tidal stream. It swoops round in a figure-of-eight shape to increase the speed of the water flowing through the turbine tenfold (see company video below), just as sailing boat cuts across the wind to go faster.

I can think of all sorts of issues with nearshore, tethered kites with wingspans greater than an F-15 fighter jet’s, but this is interesting from both a renewable energy and an engineering standpoint.

Read more at Damian Carrington’s blog at the Guardian.

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