While a massive amount of building-related energy data exists, it can be unwieldy and dispersed, hampering our ability to leverage it for energy-saving efforts and research. Building owners, utilities, cities, ESCOs, and researchers are unable to match energy use data with other building data sets, making it hard to identify energy-saving opportunities or develop new technologies. This Accelerator developed and demonstrated a unique building identifier (UBID) for spatial tagging to reduce the barriers to and cost of joining datasets. UBIDs make building energy data more useful, enabling more competitive energy infrastructure, systems and policies.