Yes, it does. Unfortunately, some confusion persists about how energy efficiency measures can be applied to mass-based compliance within the Clean Power Plan. Fortunately, the answer can be summarized in two sentences: (1) In any situation, energy efficiency is a cost-effective way to reduce demand for electricity, both reducing emissions and helping to avoid or defer other mass-based compliance actions. (2) States can take action to develop customized plans to further encourage energy efficiency as a means for meeting mass-based compliance.