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City of Pleasanton GHG Analysis of Natural Gas Replacement with RNG 1. Reported by PG&E in their data delivery forms and utilized in City of Pleasanton's inventory 2. Obtained from the US Community Protocol and utilized in City of Pleasanton's inventory 3. Combustion of renewable natural gas generates biogenic CO2 which is considered carbon neutral.The GWP for biogenic CO2 is considered 0. 4. MT CO2e is calculated by multiplying the GHG by the GWP The City consumed 121,665 Therms of natural gas in the 2021-2022 fiscal year. For the purposes of this calculation, the estimated reductions are based on the same anticipated quantity of gas needs. Reductions are calculated as the emissions generated from combusted natural gas and combusted RNG based on the percentage of procurement of each gas subtracted from the emissions currently generated from the consumed natural gas at municipal facilities.With the current rate of consumption of natural gas of 121,665 therms, 646.07 MT CO2e was emitted during the 2021-2022 fiscal year.Table 2 demonstrates the potential GHG reductions based on the quantity of RNG procured to replace natural gas.As shown, the City has the potential to reduce emissions up to 645.68 MT CO2e annually with 100% replacement of the natural gas with RNG. Table 2 GHG Emission Reduction Percent RNG Natural Gas Natural Gas RNG Quantity RING Emissions . . .-. Replacement Quantity Emissions • • - 2,3• 100% 0 0.00 121,665 0.39 645.68 75% 30,416 161.52 91,249 0.29 484.26 50% 60,833 323.03 60,833 0.19 322.84 25% 91,249 484.55 30,416 0.10 161.42 Notes:MT CO2e=metric tons carbon dioxide equivalaents 1. Emissions are calculated by multiplying the quantity of gas by the corresponding emission actor. 2. Total emission reductions are calculated by subtracting the sum of natural gas and RNG emissions from the currently emitted emissions of 646.07 MT CO2e. 3. The only emissions generated from use of RNG are CH4 and N20,therefore the reduction in emissions is associated with the reduction in CO2 Cost Analysis GHG Reductions The cost-benefit of replacing natural gas with RNG has been evaluated based on cost of procurement of the product and the social cost of carbon. The social cost of carbon is defined as the monetary value of net harm or economic damages to society from emitting a metric ton of that GHG to the atmosphere in a given year.4 The social cost of carbon is modeled based on socioeconomic predictions, climate 4 https://www.epa.gov/system/files/documents/2022-11/epa_scghg_report_draft_O.pdf Page 3