City Council Agenda and Packet 2022 09 27 SP

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Page 16 2. Building for The Future: Energy Code Update 2.1 PROJECT OVERVIEW The current adopted code and accompanying amendments encourage energy efficiency and the implementation of future -proofing strategies into new construction. However, these efforts alone will not be enough to fully achieve the City's energy and emissions reduction goals. In their2022 Work Plan," Louisville City Council outlined Phase 2 ofthe `Building forthe Future' project, directing City Staff to "consider additional measures to code adopted in 2021,which could include the IECC Net Zero Commercial Appendix, other net zero goals and strategic implementation and all- electric construction requirements" specifically for new construction of single-family homes, m ultifam ily buildings,and commercial buildings. The City contracted with Group14 Engineering, PBC (Group14) and Lotus Engineering and Sustainability, LLC (Lotus) to identify policy options that would encourage higher efficiency, net zero development, and/or all electric development. The scope of work consisted of energy modeling of different building code scenarios, development of policy options based on research and the modeling results, and public engagement on the policy options developed. A com m on fram ework used to create more effective sustainability strategies is consideration of the three pillars of sustainability: economy, environment, and equity. Creating a more sustainable Louisville requires consideration of the whole com m unity, not just environmental impacts of the action being done. Recognizing this,the project team used the three pillars as guiding principles throughout this work. 2.1.1 ENERGY M O D EU N G For the first iteration of modeling, Group14 modeled four building types —multifamily, office, retail, and single-family home —with different heating, ventilation, and air conditioning (HVAC) designs that meet current Louisville energy codes. Each building type model consisted of mixed -fuel options that utilize natural gas and electricity, and all -electric options. All other variables such as insulation and lighting were modeled to meet the current code adopted by Louisville and remained constant for each system within each building type. The modeling examined upfront costs and annual costs of each HVAC system per building type, the amount of photovoltaics (PV) required for a building to be net zero with each HVAC system per building type, PV payback periods, and greenhouse gas (GHG) em issions at base code. Group cis a ENGINE ERl NO � k1SWIMbilfty L4{ i11 12