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7.A. - Page 79 of 285 <br />2019 Energy Efficiency Ordinance Cost-effectiveness Study <br />3.2.1 GHG Emission Reductions <br />Figure 5 compares annual GHG emissions for both mixed fuel and all -electric single family 2019 code compliant <br />cases with Efficiency, Efficiency & PV and Efficiency & PV/Battery packages. GHG emissions vary by climate but <br />are consistently higher in mixed fuel cases than all -electric. Standard Design mixed fuel emissions range from 1.3 <br />(CZ 7) to 3.3 (CZ 16) lbs CO2e/square foot of floor area, where all -electric Standard Design emissions range from <br />0.7 to 1.7 lbs CO2e/ ftZ. Adding efficiency, PV and batteries to the mixed fuel code compliant prototype reduces <br />GHG emissions by 20% on average to between 1.0 and 1.8 lbs CO2e/ft2, with the exception of Climate Zones 1 <br />and 16. Adding efficiency, PV and batteries to the all -electric code compliant prototype reduces annual GHG <br />emissions by 65% on average to 0.8 lbs CO2e/ft2 or less. None of the cases completely eliminate GHG emissions. <br />Because of the time value of emissions calculation for electricity in CBECC-Res, there is always some amount of <br />GHG impacts with using electricity from the grid. <br />3.5 <br />2.5 <br />Cr <br />V) <br />❑ 2 <br />N <br />0 <br />-0 1.5 <br />OL <br />0.5 <br />■ Mixed Fuel: Std Design ■ All Electric: Std Design <br />■ Mixed Fuel: Efficiency ■ All Electric: Efficiency <br />■AII Electric: Efficiency & PV <br />■ Mixed Fuel• Efficiency& PV+Battery 0All Electric: Efficiency& PV+Battery <br />CZ01 CZ02 CZ03 CZ04 CZ05 CZ06 CZ07 CZ08 CZ09 CZ10 CZ11 CZ12 CZ13 CZ14 CZ15 CZ16 <br />Figure 5: Single family greenhouse gas emissions comparison <br />3.3 Multifamily Results <br />Table 11 through Table 13 contain cost effectiveness findings for the multifamily packages. Table 11 summarizes <br />the package costs for all the mixed fuel and all -electric efficiency, PV and battery packages. <br />Table 12 and Table 13 present the B/C ratios for all the packages according to both the On -Bill and TDV <br />methodologies for the mixed fuel and the all -electric cases, respectively. All the packages are cost-effective <br />based on TDV except Climate Zone 3 for the all -electric cases where no cost-effective combination of non - <br />preempted efficiency measures was found that met the minimum 0.5 EDR Margin threshold. Cases where the <br />B/C ratio is indicated as ">1" refer to instances where there are incremental cost savings in addition to annual <br />utility bill savings. In these cases, there is no cost associated with this upgrade and benefits are realized <br />immediately. <br />It is generally more challenging to achieve equivalent savings targets cost-effectively for the multifamily cases <br />than for the single family cases. With less exterior surface area per floor area the impact of envelope measures <br />26 © 2019-08-01 <br />331 <br />