The adoption of new technology in federal building retrofits is stunted by the fear that the technology is not proven—the risk of failure or underperformance is too high. Yet, at a time when the demand for advanced building technologies has never been greater, this caution could be counterproductive. To achieve ambitious carbon reduction targets, buildings must not only adopt but excel in energy efficiency. Recognizing this, the federal government has found it necessary to step up as a leader in fostering and promoting innovative American-made technology. Specifically, the Green Proving Ground (GPG) Program from the U.S. General Services Administration (GSA) has served as a shining example of how public sector initiatives can successfully drive advancements to the next generation of building performance.