On September 19, 2012, Chris Neme moderated this RAP webinar featuring Michael Harrington and Ronny Sandoval of Con Edison to address energy efficiency as a transmission and distribution resource. Improvements to electric efficiency in homes and businesses provide a variety of benefits to both the customers making the improvements and to the electric system as a whole. The most widely recognized are energy savings and system peak demand savings. A much less widely recognized benefit is the potential to enhance the reliability of the transmission and distribution (T&D) system. Efficiency programs can defer T&D investments either passively or actively. “Passive deferrals” typically occur as a result of system-wide efficiency programs. Though such programs are usually implemented for other reasons – e.g. to meet energy savings targets set by legislation or regulation – they can defer load growth-related investments in the T&D system for at least some period of time. “Active deferrals” are those that result from supplemental efficiency programs that are geographically-targeted for the express purpose of deferring the need for upgrades to specific elements of the T&D infrastructure. This webinar explores both innovations in quantifying passive deferral benefits and the evolution of efforts across the U.S. to pursue active deferrals of T&D investments.