This workbook is intended to serve as an illustrative model that shows how groups of energy efficiency measures can be bundled together to reduce energy demand, energy use in general, and ultimately the emissions that result from conventional power generation. We call the model an “Efficiency Power Plant” (EPP) because it shows that a viable alternative for meeting energy capacity needs is the accelerated adoption of energy efficiency. The model could be further developed by including emissions factors to estimate the emissions reductions and resultant air quality improvements that could occur as a result of energy efficiency improvements. While the model is illustrative using the generic savings values and typical end uses, if developed further by defining region-specific end uses, savings estimates, load shapes, and emissions factors it could provide detailed estimates of the potential energy, capacity, and emissions impacts that energy efficiency could provide.