results indicate that the HES and HES-IE programs are already targeting the majority of cost-effective measures through their incentive efforts. Air sealing, duct sealing, ceiling insulation, and wall insulation are all key measures that are incentivized by HES and HES-IE with mean benefit/cost ratios that are greater than one. Ductless heat pumps and heat pump water heaters are two emerging technologies that have an average benefit/cost ratio that is greater than one when using the TRC test (Table 51). Current market penetration for these measures is extremely low (see Section 2.3.3), indicating there are significant cost-effective savings opportunities associated with these technologies moving forward. Achievable potential, accounts for the likelihood of energy upgrade adoption as well as codes and standards, shows that fuel oil (7%), natural gas (8%), propane (10%), and electricity (7%) all have a savings potential between 7% and 10% of baseline consumption over the ten-year period assessed in the analysis. Recommendations The Companies should consider adding foundation wall insulation and hot water heater tank wrap insulation to their list of incentivized retrofit measures. The Companies should continue to provide incentives for ductless mini-splits and heat pump water heaters; the Companies may want to consider increasing current incentive levels to increase the market penetration as the potential savings from these measures are substantial (see Section 4.1.2). The Companies should review their savings calculations and cost-effectiveness screening processes to ensure that known changes to codes and standards are incorporated.
results indicate that the HES and HES-IE programs are already targeting the majority of cost-effective measures through their incentive efforts. Air sealing, duct sealing, ceiling insulation, and wall insulation are all key measures that are incentivized by HES and HES-IE with mean benefit/cost ratios that are greater than one. Ductless heat pumps and heat pump water heaters are two emerging technologies that have an average benefit/cost ratio that is greater than one when using the TRC test (Table 51). Current market penetration for these measures is extremely low (see Section 2.3.3), indicating there are significant cost-effective savings opportunities associated with these technologies moving forward. Achievable potential, accounts for the likelihood of energy upgrade adoption as well as codes and standards, shows that fuel oil (7%), natural gas (8%), propane (10%), and electricity (7%) all have a savings potential between 7% and 10% of baseline consumption over the ten-year period assessed in the analysis. Recommendations The Companies should consider adding foundation wall insulation and hot water heater tank wrap insulation to their list of incentivized retrofit measures. The Companies should continue to provide incentives for ductless mini-splits and heat pump water heaters; the Companies may want to consider increasing current incentive levels to increase the market penetration as the potential savings from these measures are substantial (see Section 4.1.2). The Companies should review their savings calculations and cost-effectiveness screening processes to ensure that known changes to codes and standards are incorporated.