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How are Greenhouse Gas (GHG) Savings computed?

April 26, 2017computed Gas GHG greenhouse savings

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How are Greenhouse Gas (GHG) Savings computed?

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Coulomb uses EPA estimates to derive a formula relating GreenHouse Gas (GHG) Savings to the amount of energy delivered to the vehicle from the charging station. The following estimates are used in the calculations, with references: • Driving an ICE (Internal Combustion Engine) vehicle emits 8.8 kg CO2/gal (19.4 lbs CO2/gal). [1] • The US Passenger Car average efficiency for ICE vehicles is 23.9 mi/gal (mpg) [2] • An Electric Vehicle (EV) has an average efficiency of 5.0 mi/kWh. [Note: This is a Coulomb estimate based on data for several types of Electric Vehicles.] • Electricity generation, for the mix consumed in the CAMX (WECC California) region, emits 0.49 kg CO2/kWh (1.08 lbs CO2/kWh) [3] • CO2 is 95% of GHG emissions [4] Combining these numbers yields 1.42 kg/kWh (3.13 lbs/kWh) of GHG Savings for the CAMX (WECC California) region. Future releases will allow for customization of the GHG formula to reflect regional differences in electricity generation.