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7.A. - Page 85 of 285 <br />2019 Energy Efficiency Ordinance Cost-effectiveness Study <br />3.3.1 GHG Emission Reductions <br />Figure 8 compares annual GHG emissions for both mixed fuel and all -electric multifamily 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 2.0 <br />to 3.0 lbs CO2e/square foot of floor area, where all -electric standard design emissions range from 1.2 to 1.7 lbs <br />CO2e/ ftz. Adding PV, batteries and efficiency to the mixed fuel code compliant prototype reduces annual GHG <br />emissions by 17% on average to between 1.7 and 2.2 lbs CO2e/ft2, except Climate Zone 16. Adding PV, batteries <br />and efficiency to the all -electric code compliant prototype reduces annual GHG emissions by 64% on average to <br />0.6 lbs CO2e/ft2 or less with the exception of Climate Zones 14, 15 and 16. As in the single family case, none of <br />the cases completely eliminate GHG emissions because of the time value of emissions calculation for electricity <br />in CBECC-Res. <br />3.5 <br />3 <br />+, 2.5 <br />Cr <br />w <br />v 2 <br />rV <br />U <br />1.5 <br />IDL <br />1 <br />0.5 <br />Mixed Fuel: Std Design IAll Electric: Std Design <br />■ Mixed Fuel: Efficiency I All Electric: Efficiency <br />All Electric Efficiency & PV <br />■ Mixed Fuel Efficiency & PV+Battery I All Electric: Efficiency & PV+Battery <br />CZ01 CZ02 CZ03 CZ04 CZ05 CZ06 CZ07 CZ08 CZ09 CZ10 CZ11 CZ12 CZ13 CZ14 CZ15 CZ16 <br />Figure 8: Multifamily greenhouse gas emissions comparison <br />3.4 Electrification Results <br />Cost-effectiveness results comparing mixed fuel and all -electric cases are summarized below. The tables show <br />average annual utility bill impacts and lifetime utility bill impacts, which account for fuel escalation for electricity <br />and natural gas (see Section 2.5), lifetime equipment cost savings, and both On -Bill and TDV cost-effectiveness <br />(B/C ratio). Positive utility bill values indicate lower utility costs for the all -electric home relative to the mixed <br />fuel case while negative values in red and parenthesis indicate higher utility costs for the all -electric case. <br />Lifetime equipment cost savings include savings due to eliminating natural gas infrastructure and replacement <br />costs for appliances based on equipment life. Positive values for the lifetime equipment cost savings indicate <br />lower installed costs for the all -electric and negative values indicate higher costs. B/C ratios 1.0 or greater <br />indicate positive cost-effectiveness. Cases where the B/C ratio is indicated as ">1" refer to instances where there <br />was incremental cost savings in addition to annual utility bill savings. In these cases, there is no cost associated <br />with this upgrade and benefits are realized immediately. <br />32 © 2019-08-01 <br />337 <br />