Here's half the photo taken from Wikipedia's story on the Nellis Air Force Base installation of 72,000 photovoltaic cells in a tracking array. The cost was high - $100 million, but financed in a manageable manner. It took at least six years to make it's way from legislative proposal to finished product, but the 15 megawatts of electricity at 2.2 cents/kWh will save the base $1 million each year in costs.
The design and construction company, SunPower, is a leader in the field. According to Wikipedia, they are to build a 1-megawatt parking lot canopy solar array for Agilent Technologies, Inc., that will be the largest solar installation in Sonoma County, California.
The photos that accompany the article are in the public domain as they have been taken by Air Force personnel: thus, U.S. Air Force photo by Master Sgt. Robert Valenca. It seems that you can see the entire photo by clicking on what is shown.
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