World’s biggest tidal energy ‘kite’ could single-handedly power a small town

People have been harnessing tidal energy for milling grain for more than 1,000 years. As you’d imagine though, today’s contraptions for tapping this 24/7 power source are a little more sophisticated.  One of the most eye-catching designs to emerge in recent years is a giant metal ‘kite’ which swims underwater against the current, turning its rotor and generating electricity. Power is then sent to the grid via a subsea cable which also acts as the kite’s tether