This guide shows facility managers how the ENERGY STAR Measurement and Tracking Tool, Portfolio Manager, can assist in evaluating and tracking a facility's energy consumption, help identify underperforming facilities, generate an ENERGY STAR score, track energy savings from implementation of energy efficient measures, and evaluate potential energy saving measures for a facility. This tool can help facility owners and managers in several domains, including local government, make more informed decision on topics and matters that are based on the energy performance of their facility.