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| Solar power for United States Postal Service Chevron Energy Solutions has completed the largest solar power and energy-efficiency project for the United States Postal Service at its mail center in Northern California. The 910-kilowatt solar power system – the largest installed to date at a federal building – spans a rooftop area nearly the size of two football fields, and it will help meet electric demand during peak periods. Other energy-efficient upgrades on-site include high-quality lighting systems that improve work areas for Postal Service employees; motion-sensor technologies that automatically control where light is used; three 300-ton centrifugal chillers – which eliminate ozone-depleting chlorofluorocarbon refrigerants from the facility – and other heating, ventilation and air conditioning systems; a new energy management system to control HVAC equipment; high-efficiency air compressors; and water conservation measures. The improvements at the facility will lower total annual electricity purchases by almost 11 million kilowatt hours. This reduced demand for power translates to 7,400 fewer tons of carbon dioxide emitted by the local electric utility annually - the same volume of carbon dioxide that would be absorbed by planting more than 2,000 acres of trees. write your comments about the article :: © 2006 Construction News :: home page |