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14 green prisons

Oct. 25, 2010, 11:05 a.m.
exterior view of prison

Photo: Federal Board of Prisons

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FCI Englewood in Englewood, Colo.

Federal Correction Institute Englewood makes the list for its new, 23,000-square-foot solar thermal system. Abengoa Solar Inc., a company with U.S. headquarters located in nearby Lakewood, Colo., designed the system, which in optimal conditions can save more than 4,000 kilowatt hours of energy daily. Parabolic collector modules concentrate solar radiation onto tubes filled with fluid, which transfers the heat to a 15,000-gallon hot water storage tank.