This session will report on the results of benchmarking over 120,000 units of affordable housing in Massachusetts as part of the utility sponsored Affordable Housing Metrics project. The process, challenges, and successes of benchmarking at scale will be discussed. The database of historical energy consumption that results from the benchmarking process is being used by building managers, third party energy consultants, utilities, building owners, and policy makers to improve asset management, drive energy efficiency efforts, reduce operating costs, and affect energy policy on a local, state, and national level. Each of these areas will be discussed with a focus on big-picture thinking about how benchmarking at scale can drive an energy agenda at multiple levels and with multiple stake-holders.