Mountain View: A solar-powered airplane is preparing to leave California for Arizona to continue its journey around the world using only energy from the sun.
The Swiss-made Solar Impulse 2 will take off from Mountain View before dawn Monday for what should be a 16-hour flight to Phoenix.
Swiss pilot Andre Borschberg will be at the helm of the plane that began circumnavigation the globe last year.
Borschberg's co-pilot, Bertrand Piccard, also of Switzerland, made the three-day trip from Hawaii to the heart of Silicon Valley, where he landed last week.
The Solar Impulse 2's wings, which stretch wider than those of a Boeing 747, are equipped with 17,000 solar cells that power propellers and charge batteries. The plane runs on stored energy at night.
After Phoenix, the plane will make two more stops in the United States before crossing the Atlantic Ocean to Europe or northern Africa, according to the website documenting the journey.
The two legs to cross the Pacific were the riskiest part of the plane's travels because of the lack of emergency landing sites.
"We have demonstrated it is feasible to fly many days, many nights, that the technology works" said Borschberg, 63, who piloted the plane during a five-day trip from Japan to Hawaii and who kept himself alert by doing yoga poses and meditation.
The crew was forced to stay in Oahu for nine months after the plane's battery system sustained heat damage on its trip from Japan.
The single-seat aircraft began its voyage in March 2015 from Abu Dhabi, the capital of the United Arab Emirates and made stops in Oman, Myanmar, China and Japan.
The layovers will give the pilots a chance to swap places and engage with local communities along the way so they can explain the project, which is estimated to cost more than $100 million and began in 2002 to highlight the importance of renewable energy and the spirit of innovation.
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