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5:15 p.m. - Sustainable Dubuque Work Session – Greenhouse Gas Inventory Update and Energy Efficiency in Commercial Buildings Update Copyrighted August 7, 2023 City of Dubuque Work Session - Top # 01. City Council Meeting ITEM TITLE: 5:15 p.m. - Sustainable Dubuque Work Session— Greenhouse Gas Inventory Update and Energy Efficiency in Commercial Buildings Update SUM MARY: Sustainable Community Coordinator Gina Bell is submitting information for the Sustainable Dubuque Work Session— Greenhouse Gas Inventory Update and Energy Efficiency in Commercial Buildings Update. SUGGESTED DISPOSITION: ATTACHMENTS: Description Type MVM Memo City Manager Memo Staff Memo Staff Memo GHG Results_2022 Supporting Documentation Dubuque THE CITY QF � All-Meriea Ciry DLT B E ; . � . � �� MaSt� Z�C� aYd t�Q Mt55ZSSZ Z zoa�•zoiz•�ai3 YP pp za��*zai� TO: The Honorable Mayor and City Council Members FROM: Michael C. Van Milligen, City Manager SUBJECT: Sustainable Dubuque Work Session — Greenhouse Gas Inventory Update and Energy Efficiency in Commercial Buildings Update DATE: August 2, 2023 Sustainable Community Coordinator Gina Bell is submitting information for the Sustainable Dubuque Work Session — Greenhouse Gas Inventory Update and Energy Efficiency in Commercial Buildings Update. v Mic ael C. Van Milligen MCVM:sv Attachment cc: Crenna Brumwell, City Attorney Cori Burbach, Assistant City Manager Gina Bell, Sustainable Community Coordinator Dubuque THE CITY OF � All•Aiaerica Cily DuB E .�..� ��..�w � I.� �� MGIstP ieC� On the MissiSsi i zoo�.zosz•zoi3 �"p pp 2o��*zo�g MEMORANDUM TO: Michael C. Van Milligen, City Manager FROM: Gina Bell, Sustainable Community Coordinator SUBJECT: Sustainable Dubuque Work Session — Greenhouse Gas Inventory Update and Energy Efficiency in Commercial Buildings Update DATE: August 1, 2023 INTRODUCTION This memo is for informational purposes only in preparation for the Sustainable Dubuque Work Session on August 7, 2023. BACKGROUND The City Council named implementation of the 50°/o by 2030 Community Climate Action and Resiliency Plan (CAP) a high priority and funded specific actions to help reduce and measure our greenhouse gas emissions (GHG). Additionally, the City Council funded specific actions from the CAP, as well as provided funding to add staff capacity to the Office of Sustainability. Amanda Lewis joined the City of Dubuque's Office of Sustainability as Climate Action Coordinator in August 2022 and began working on a pilot project related to commercial buildings and energy efficiency. The project was developed to explore incentivizing energy conservation and efficiency in larger buildings. Every three years the Office of Sustainability contracts with an outside agency to conduct a greenhouse gas inventory to track our efforts to meet our 50% reduction goal by 2030. We contracted Lotus Engineering + Sustainability to update the inventory. DISCUSSION The purpose of this work session is to give an update on our progress towards meeting the 50% by 2030 greenhouse gas emissions reduction goal as well as share information about the Commercial Building Energy Efficiency pilot. REQUESTED ACTION No action needed, for informational purposes only. City of Dubuque, IA: 2022 Greenhouse Gas Emissions Inventory Results Introduction The City of Dubuque hired Lotus Engineering and Sustainability (Lotus) to complete a greenhouse gas (GHG) emissions inventory for community-wide emissions in 2022. Dubuque has been measuring community GHG emissions since 2003.The inventory completed by Lotus in 2022 included all of the same sources as in previous years and added several new sources. Between 2003 and 2018, the emission sources measured by Dubuque included residential electricity, residential natural gas, commercial and industrial (C&I) electricity, C&I natural gas, gasoline on-road vehicles, diesel on-road vehicles,and landfill gas. For the 2022 inventory, Lotus added the following sources: residential propane, residential fugitive emissions, residential transmission&distribution(T&D)losses,C&I propane, C&I stationary diesel, C&I T&D losses, on-road electricity,on-road T&D losses,transit,railways,aviation,waterborne,composted waste,wastewater,and refrigerant leakage. 2022 GHG Inventory Results TOTAL EMISSIONS The City of Dubuque's GHG emissions totaled 744,112 mt COze in 2022. This value includes emissions from all sources listed in the previous section. Dubuque's per �PPU capita emissions in 2022 totaled 13 mt COze per �% � rtesidentia� person. suildings Waste& 23� EMISSIONS BY SEC7'OR Wastewater 2% ,. The three largest sectors, or categories, of Figurc 1.2022 Emissions by scctar. emissions in 2022 were C&I building energy usage (43% of total emissions), transpartarion (30%), and residenrial building energy usage (23%).The waste and wastewater sectar and the industrial processes and product use(IPPU)sector each made up 2% of total emissions. See Figure 1. EMISSIONS BY SOURCE 1 Breaking down sectors into individual sources,the three largest sources of emissions for Dubuque in 2022 were natural gas usage(32%of total emissions), electricity usage(31%), and on-road fossil fuel vehicles (29%). Solid waste and refrigerant leakage each made up 2%of total emissions, and the remaining sources together comprised less than 3°/o of total emissions. See Figure 2. Emissions Over Time Prapane 0.4% Solid Waste 2% Fugitive � � Emissions 1% � ' ' Transit Other 0.1 i, 5% Railways Electricity �% 31°/ \�` � Aviation 0.1% Wastewater 0.2% Figure 2.2022 Emissions by source. Sources comprising less than 0.1%of total not included. TOr��A� E�vIiSSiONS 2018-2022 85D,000 � v Looking at total emissions(including the new O $00,000 sources added by Lotus), Dubuque's U emissions decreased 9%between 2018 and '-' 2022. Excluding the new sources (only � 750,000 looking at comparable sources), Dubuque's � emissions decreased 14% between the two 'a 700,�00 years. In other words, despite the addition of � several new sources, Dubuque's total � emissions still decreased. See Figure 3. One � 65Q,000 — impartant change to note is that Dubuque's � landfill began collecting landfill gas between 2018 and 2022, decreasing the landfill's 6D0,000 emissions by 76%. 201$ 2022 EMISSIONS BY SOURCE ZO1g-ZO22 � Totpl Emissians Comparqble Emissions Figurc 3.Total and comparablc cmissions in 2018 and 2022. 2 Focusing on only comparable sources between 2018 and 2022, all emission sources decreased except for on-road gasoline and diesel vehicle emissions. See Figure 4.Emissions reductions for electricity can be attributed to reductions in Alliant Energy's emission factors. Between 2018 and 2022, the emission factor for electricity decreased from 0.538 mt COz/MWh to 0.382 mt COz/MWh. ToTa�. EM�ss�ons 2003-2022 �50,000 zoa,oao � � 150,000 � c � 1�0,000 N � 50,000 0 , • Residential Residential Natural Commercial and Commercial and On-Road Gasoline On-Road Diesel Landfill Electricity Gas Industrial Industrial Natural Electricity Gas ■2018 ■2022 Figure 4.Comparable emission sources in 2018 and 2022. Looking at Dubuque's total emissions (including new sources added by Lotus), between the baseline year of 2003 and the most recent inventory year of 2022,Dubuque's emissions decreased by 34%.Excluding the new emission sources added in 2022,Dubuque's emissions decreased 37%between 2003 and 2022. See Figure 5 on the following page. Science-based Target Lotus used the One Planet City Challenge's(OPCC)approach to calculate a science-based emissions reduction target for Dubuque.This approach uses the US Human Development Index Score(HDI)and population growth projections, as well as the community's total scope 1 and 2 emissions and population during the baseline year. For Dubuque, the 3 baseline year is 2018. Using the methodology from OPCC,Lotus calculated Dubuque's science-based target to be 62.4% emissions reduction from 20181evels by 2030. 1,200,000 1,100,000 .-. a� N O 1,000,000 Y � N 0 900,000 .N � � 744,112 w 800,000 ,`: 700,000 703,270 600,000 2003 2007 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2022 fTotal Emissions tComparable Emissions Figure 5.Emission trends from 2003 to 2022.Emission sources remain identical from 2022 to 2018."Total emissions"value in orange reflects the additional emission sources added by Lotus in the 2022 inventory. What's Next? In addition to this overview of Dubuque's 2022 GHG inventory, Lotus will be creating a business-as-usual model (BAU)and a final report.The BAU will help Dubuque visualize what the future of GHG emissions in the city would look like if no further climate action work were to occur. This information will be vital in targering emission sources for future reduction work. The final report will provide a more in-depth analysis of the 2022 inventory results, including tables and more figures.These final products will be essential in supporting Dubuque's future climate action wark and will help Dubuque reach its target for emissions reduction. 4