The Greenhouse Gases, Regulated Emissions, and Energy Use
in Transportation (GREET) Model
http://www.transportation.anl.gov/software/GREET/
Sponsored by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy
(EERE), Argonne has developed a full life-cycle model called GREET (Greenhouse gases, Regulated
Emissions, and Energy use in Transportation). It allows researchers and analysts to evaluate energy and
emission impacts of various vehicle and fuel combinations on a full fuel-cycle/vehicle-cycle basis. The first
version of GREET was released in 1996. Since then, Argonne has continued to update and expand the model.
The most recent GREET versions are GREET 1.7 version for fuel-cycle analysis and GREET 2.7 version
for vehicle-cycle analysis
For a given vehicle and fuel system, GREET separately calculates the following:
- Consumption of total energy (energy in non-renewable and renewable sources), fossil fuels
(petroleum, natural gas, and coal together), petroleum, coal and natural gas. - Emissions of CO2-equivalent greenhouse gases - primarily carbon dioxide (CO2), methane (CH4),
and nitrous oxide (N2O). - Emissions of six criteria pollutants: volatile organic compounds (VOCs), carbon monoxide (CO),
nitrogen oxide (NOx), particulate matter with size smaller than 10 micron (PM10), particulate
matter with size smaller than 2.5 micron (PM2.5),and sulfur oxides (SOx).
GREET includes more than 100 fuel production pathways and more than 70 vehicle/fuel systems.
These vehicle/fuel systems cover all major vehicle technologies in the market and R&D arena:- Conventional spark-ignition engines
- Direct-injection, spark-ignition engines
- Direct injection, compression-ignition engines
- Grid-independent hybrid electric vehicles
- Grid-connected (or plug-in) hybrid electric vehicles
- Battery-powered electric vehicles
- Fuel-cell vehicles
To address technology improvements over time, GREET simulates vehicle/fuel systems over the period from 1990 to 2020, in five-year intervals.
For additional information about the GREET model, see the GREET website, or contact:
Michael Q. Wang
Argonne National Laboratory
9700 South Cass Avenue, ES/362
Argonne, IL 60439-4815
phone: 630-252-2819
fax: 630-252-3443
email: mqwang@anl.gov
