The most promising initiatives near term, he thinks, include solar thermal, high-altitude wind power and deep drilling to tap geothermal power.

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AeroVironment also established world altitude records with its solar-electric, unmanned aircraft systems at the U.S. Navy Pacific Missile Range Facility at Barking Sands on Kauai.

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The satellite - which had been intended to study the effects of climate change - should have separated from the rocket and deployed its solar panels some nine minutes after take-off, at an altitude of 302km.

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Should any of you want to join along with Piccard and Borschberg as they fly across the country, you can hit the Solar Impulse Across America website to see a livestream from the cockpit, along with real-time altitude, air speed and battery status of the aircraft.

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