This paper presents estimates of the maximum achievable cost effective potential forelectric energy and peak demand savings from energy efficiency measures in the geographicregion of Connecticut served by United Illuminating (UI) and Connecticut Light and PowerCompany (CL&P) for the ten year period from 2003 through 2012. The results of the studyshowed that there is a significant savings potential in Connecticut for the implementation ofadditional and long-lasting cost effective energy efficiency measures. The net present valuesavings to ratepayers in Connecticut is $1.8 billion if the maximum achievable cost effectivepotential is captured by CL&P's and UI's programs over the next decade. In addition, there aresignificant reductions in emissions from power plants in the State and there are other significantnon-energy benefits.This paper presents the detailed sector-level results of the study, including: 1) energyefficiency supply curves; 2) energy savings potential broken down by measure type (I.e., earlyreplacement, retrofit, and replace-on-burnout) and end-use category; and 3) benefit/cost ratios.In addition, the paper describes, in step-by-step fashion, the methodologies used in estimatingtechnical potential, maximum achievable potential and maximum achievable cost effectivepotential for each sector (residential, commercial, industrial). Finally, the paper discusses thevaluable lessons learned through the process of completing this study, including insights forothers considering similar efforts. The paper also provides suggestions for preliminaryassessments and data collection to be conducted prior to embarking on energy efficiencypotential studies. One unique aspect of this study which confounded an already challengingproject was the re-allocation of the State's energy efficiency funds by the Governor and Statelegislature in order to address statewide funding deficits, which resulted in immediate layoffs ofutility personnel who were critical to the project. The paper will conclude with comparisons ofConnecticut efficiency potential to results of recent studies for other states.
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