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As governments push to adopt sustainable practices, one holy grail is creating working environments that achieve net-zero energy consumption. That's the idea behind a newly opened office building at the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) in Golden, Colo. Known as the Research Support Facility (RSF), the structure is designed to create as much energy as it consumes, making it one of the world's most energy-efficient buildings.