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ISRAEL - JUNE 24: The solar receiving tower sits above a field of heliostats at the AORA Samar power station in the Arava Valley, Israel, on Wednesday, June 24, 2009. AORA's hybrid technology enables the system to run on both solar radiation input and alternative fuel, providing uninterrupted green power, 24 hours-a day. (Photo by Ahikam Seri/Bloomberg via Getty Images)

ISRAEL - JUNE 24:  The solar receiving tower sits above a field of heliostats at the AORA Samar power station in the Arava Valley, Israel, on Wednesday, June 24, 2009. AORA's hybrid technology enables the system to run on both solar radiation input and alternative fuel, providing uninterrupted green power, 24 hours-a day.  (Photo by Ahikam Seri/Bloomberg via Getty Images)