GSA, DOE, FEMP, and Rocky Mountain Institute (RMI) convened a charrette at GSA offices in Washington, D.C. on March 4, 2013 to explore opportunities for deep energy retrofit ESPCs. The goals of the charrette were to: 1) Solicit input from energy service companies (ESCOs) on achieving deep retrofits and provide an opportunity for open discussion, continuing the process that began at the 2011 Boulder charrette; 2) Discuss barriers and solutions to “raise the bar” on energy savings provided through ESPCs; 3) Develop a list of lessons learned and best practices to increase the potential cost savings across the GSA portfolio; and 4) Renew enthusiasm at the agency and ESCOs.