Data Sources and Assumptions for the Electricity Sources and Fuel-Cycle Emissions Tool
The following data sources and assumptions were used to calculate the emissions, fuel use, and electricity sources for conventional and electric-drive vehicles in the Electricity Sources and Fuel-Cycle Emissions Tool.
Electricity Sources
These assumptions were used to show electricity sources.
Parameter | Value | Unit | Year | Source |
---|---|---|---|---|
Electricity fuel mix | varies by state | thousand MWh | 2022 | U.S. Energy Information Administration's Open Data API for Electricity Net Generation |
Annual Vehicle Emissions
These assumptions were used to calculate the annual vehicle emissions for an average conventional, hybrid electric, plug-in hybrid electric, and all-electric vehicle.
Parameter | Value | Unit | Year | Source |
---|---|---|---|---|
Gasoline emissions | 23.7 | lbs. CO2e/gal | 2019 | Well-to-wheels greenhouse gas emissions factor derived from Argonne National Laboratory's GREET model |
ICE gasoline efficiency | 21.79 | mi/gal | 2019 | Weighted average of projected vehicle sales from EPA Automotive Trends Report and mpg from the Fuel Economy Guide |
HEV gasoline efficiency | 39.78 | mi/gal | 2019 | Weighted average of vehicle sales from U.S. HEV Sales by Model and mpg from the Fuel Economy Guide |
PHEV gasoline efficiency | 40.80 | mi/gal | 2019 | Weighted average of vehicle sales from U.S. Plug-in Electric Vehicle Sales by Model and mpg from the Fuel Economy Guide |
PHEV electric efficiency | 3.03 | mi/kWh | ||
PHEV electric range | 27.74 | miles | ||
BEV electric efficiency | 3.60 | mi/kWh | ||
PHEV % electric VMT | 56.3 | % VMT | 2010 | SAE J2841, Appendix B, MDIUF based on PHEV electric range |
Average annual VMT | 11,579 | miles | 2019 | Oak Ridge National Laboratory's Transportation Energy Data Book Edition 39, Table 4.3 |
Emissions from electric power | varies by state | thousand metric tons CO2e | 2022 | U.S. Energy Information Administration's Electric Power Annual |
Energy generated from electric power | varies by state | thousand MWh |
Average Emissions from Generated Electricity
The following equation is used to calculate average emissions from generated electricity at the state and national level:
The result of this equation is used to calculate annual vehicle emissions for BEVs and PHEVs.
All-Electric Vehicle Emissions
The following equation is used to calculate emissions for all-electric vehicles (EVs) also called battery electric vehicles (BEVs):
Plug-In Hybrid Electric Vehicle Emissions
The following equation is used to calculate emissions for plug-in hybrid electric vehicles (PHEVs):
Hybrid Electric Vehicle Emissions
The following equation is used to calculate emissions for hybrid electric vehicles (HEVs):
Gasoline Vehicle Emissions
The following equation is used to calculate emissions for gasoline vehicles also called internal combustion engine (ICE) vehicles: