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2017 GHG Emissions Inventory <br /> <br />Pleasanton Climate Action Plan Update 15 <br />Electricity <br />Emissions resulting from electricity consumption were estimated by multiplying annual electricity <br />consumed by an emission factor representing the average emissions associated with generation of one <br />megawatt hour (MWh) of electricity. Electricity is supplied to the City by PG&E. In its 2017 report to the <br />verification body, The Climate Registry, PG&E reported an electricity carbon intensity factor of 210 <br />pounds CO2e per MWh.37 PG&E also reported to the California Energy Commission, an average of 33 <br />percent renewable energy in its portfolio in 2017.38 From 2005, residential electricity use decreased by <br />27,275 MWh while nonresidential electricity decreased by 79,742 MWh for a total net decrease of <br />107,017 MWh. Therefore, the 87,686 MT CO2e reduction in GHG emissions from electricity between <br />2005 and 2017 was due to a decrease in electricity usage and an approximately 57 percent reduction in <br />the PG&E electricity emission factor. <br />In 2017, a total 48,481 MTCO2e was generated within the community due to residential and <br />commercial electricity use. Figure 3 and Table 12 show the breakdown of emissions from electricity by <br />both category (residential, nonresidential) and by source. <br />Direct access electricity was also calculated using the same methodology, but with a calculated <br />emissions factor of 0.203 MT CO2e/MWh. This is equivalent to the California State grid (CAMX) average <br />carbon intensity of electricity (reported by the California Energy Commission), as direct access <br />electricity is not provided by PG&E. 39 Direct access electricity accounted for 52,783 MWh of electricity <br />use in 2017, which resulted in 10,700 MT CO2e of emissions. <br />Natural Gas <br />In order to calculate emissions from natural gas consumption, the total therms consumed is multiplied <br />by the PG&E reported emissions factor of .00531 MT CO2/therm, which remained constant across <br />inventory years. Residential natural gas usage decreased from 12.5 million therms in 2005 to 11.8 <br />million therms in 2017, and nonresidential natural gas usage increased from 8.1 million therms to 10.6 <br />million therms. Overall, this resulted in a 9,558 MT CO2e increase in emissions from the natural gas <br />sector in 2005 compared to 2017. <br />In 2017, the residential and nonresidential sectors consumed a total of 22,375,992 therms of natural <br />gas, which, based on the emission factor of 0.00531 MT CO2/therms, generated 118,828 MTCO2e. A <br />complete breakdown of natural gas use by category and sector is provided in Figure 1 and Table 7. <br /> <br />37 The Climate Registry. 2019 Default Emissions Factors. Available: <https://www.theclimateregistry.org/wp-content/uploads/2019/05/The- <br />Climate-Registry-2019-Default-Emission-Factor-Document.pdf>. Accessed: April 15, 2020 <br />38 California Energy Commission. Pacific Gas and Electric Company 2017 Power Content Label. Available: <br /><https://ww2.energy.ca.gov/pcl/labels/2017_labels/PG_and_E_2017_PCL.pdf>. Accessed: April 15, 2020 <br />39 California Energy Commission. Total System Electric Generation. Available: <br /><https://ww2.energy.ca.gov/almanac/electricity_data/system_power/2017_total_system_power.html>. Accessed: May 7, 2020.