This report provides a summary assessment of end use load profile (EULP) data currently available in Massachusetts, New York, and the Northeast region and identifies regional needs for EULP data in order to guide recommendations for future priority EULP research. As background, EULPs quantify how and when energy is used on a granular (end use/subsector) level. This information is important to many energy and environmental stakeholders in the Northeast and nationally. The report highlights how quality EULPs can contribute to the energy industry in many ways, including providing a better understanding of the value of energy efficiency, demand response, and other distributed resources, and helping with planning and forecasting efforts.