The new system involves a 205 kilowatt photovoltaic solar array placed on the roof of the building. The photovoltaic system is 40- to 50 times the size of a typical residential PV system and is one of the largest in the Washington area, officials said. It is expected to save as much as $26,000 in utility costs during its first year of operation.

"As America's largest energy consumer, the U.S. government has the responsibility and the opportunity to lead the way to a cleaner, more efficient, more affordable and more secure energy future," Bodman said in prepared remarks. "I determined the Department of Energy should -- and would -- lead by example."

Bodman said the significance of the solar array is both practical and symbolic: "It improves the way the department consumes energy. And it is a symbol of America's commitment to using the best available new technologies to confront the energy challenges we face today and will face tomorrow."

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