&gt; The division has said that its experimental technology can produce 50% more energy with 90% less materials than traditional wind turbines.<p>That&#x27;s really neat but how long will these devices last?<p>And the newer generation wind turbines are absolute monsters, 7.6 MW in one turbine and at the tip 198 meters high, that&#x27;s not so far from the 250 meters for these kites, you&#x27;d need 12 of the Makani devices to equal <i>one</i> Enercon E-126.<p>(though the windshear would be a larger factor for a ground based machine)