Data Sources and Assumptions for the Electricity Sources and 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 Emissions Tool.
Electricity Sources
These assumptions were used to show electricity sources.
Parameter | Value | Source |
---|---|---|
Electricity fuel mix | varies | U.S. Energy Information Administration's Open Data API for Electricity Net Generation. Updated annually based on data for the previous year. |
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 | Source |
---|---|---|
Pounds of CO2e per gallon of gasoline | 23.5 | Full fuel cycle (well to wheels) greenhouse gas emissions (GHG) factors derived from GREET 2015. Results in CO2 equivalents. |
Conventional vehicle mpg | 24.3 | CAFE Standard |
HEV mpg | 44.4 | Weighted average of 2016 model year vehicle sales in 2015 from U.S. HEV Sales by Model and mpg values from the 2016 Fuel Economy Guide. |
PHEV mpg | 37.9 | Weighted average of 2016 model year vehicle sales in 2015 from U.S. Plug-in Electric Vehicle Sales by Model and mpg values from the 2016 Fuel Economy Guide. |
PHEV kWh/mi | 0.367 | Weighted average of 2016 model year vehicle sales in 2015 from U.S. Plug-in Electric Vehicle Sales by Model and mpg values from the 2016 Fuel Economy Guide. |
PHEV all-electric range | 33 | Weighted average of 2016 model year vehicle sales in 2015 from U.S. Plug-in Electric Vehicle Sales by Model and mpg values from the 2016 Fuel Economy Guide. |
EV kWh/mi | 0.32 | Weighted average of 2016 model year vehicle sales in 2015 from U.S. Plug-in Electric Vehicle Sales by Model and mpg values from the 2016 Fuel Economy Guide. |
Percentage of PHEV annual miles driven on electricity | 55% | Estimate based on SAE J2841 assuming the PHEV all-electric range is 33 miles. |
Average annual vehicle miles driven | 11,824 | Transportation Energy Data Book Edition 34, Table 8.1 (total vehicle miles traveled divided by vehicles in operation), 2013 |