GREET® Model

The Greenhouse gases, Regulated Emissions, and Energy use in Transportation Model

October 9, 2017
GREET 2017 Release

The Argonne National Laboratory’s Systems Assessment Group is pleased to announce the 2017 release of the suite of GREET models and associated documentation. This release includes the following expansions and updates:

I. Major Expansions and Updates:

  • Added plastic-to-Fuel (PTF) pathway.
  • Added biomass-derived high octane gasoline via indirect liquefaction and renewable gasoline/diesel pathways from fast pyrolysis.
  • Added wood biomass biofuel production pathways, considering carbon temporal effects.
  • Added new pathways for corn kernel fiber ethanol.
  • Updated CCLUB to include added four land use change (LUC) cases and associated soil organic carbon change (SOC) updates related to soybean biodiesel pathways.
  • Updated the emission factors of criteria air pollutant (combustion and non-combustion emissions) for SMR hydrogen and petroleum fuels.
  • Added new pathways for by-product hydrogen produced from chlor-alkali processes.
  • Implemented new pathways for fuel cell electric medium- and heavy-duty vehicles powered by gaseous hydrogen.
  • Expanded the power sector in GREET with several natural gas and coal combined heat and power (CHP) and carbon capture and storage (CCS) technologies.
  • Updated the fuel economy and vehicle weights of light duty vehicles.
  • Added LCI data for the production of new and recycled cathode material for batteries of electric vehicles. Also updated energy and water consumption for lithium-ion battery manufacturing.
  • Developed distribution functions for water consumption factors of major processes in GREET.
  • Added production pathway of the low octane gasoline-like fuel (LOF) and corresponding vehicle technology of gasoline compression ignition (GCI) engines.

II. Other Updates:

  • Updated methane leakage emissions for natural gas pathways.
  • Updated U.S. electricity generation mix based on most recent Energy Information Administration (EIA)’s Annual Energy Outlook (AEO).
  • Updated the inventory and process data of soybean farming, soy oil extraction, and vegetable oil transesterification processes.
  • Updated the inventory data of tallow rendering and high free fatty acid (FFA) oil transesterification processes associated with tallow biodiesel pathway.
  • Updated energy consumption and material efficiency for steel and Aluminum stamping.

For more information on these updates, please use the following link: (117Kb pdf)

Oct 9, 2017
GREET 2017 Downloads (fuel and vehicle cycles):

  • To download and the latest 2017 database please use the following link

GREET Fuel Cycle (GREET 1):

  • To download GREET_1_2017 and the latest 2017 database please use the following link GREET 1 Series

GREET Vehicle Cycle (GREET 2):

  • To download GREET_2_2017 and the latest 2017 database please use the following link GREET 2 Series

Oct 25, 2013

We are pleased to announce the release of the newly developed AFLEET Tool. This tool has been designed for Clean Cities stakeholders to estimate petroleum use, greenhouse gas emissions, air pollutant emissions, and cost of ownership of light-duty and heavy-duty vehicles using simple spreadsheet inputs. For more information and to download the software, check out the AFLEET Tool

How Does GREET Work?
October 2, 2015
The GREET model

To fully evaluate energy and emission impacts of advanced vehicle technologies and new transportation fuels, the fuel cycle from wells to wheels and the vehicle cycle through material recovery and vehicle disposal need to be considered. 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 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 the GREET1 2017 version for fuel-cycle analysis and GREET2 2017 version for vehicle-cycle analysis.

GREET was developed as a multidimensional spreadsheet model in Microsoft Excel. This public domain model is available free of charge for anyone to use.

For a given vehicle and fuel system, GREET separately calculates the following:

  • Consumption of total resources (energy in non-renewable and renewable sources), fossil fuels (petroleum, natural gas, and coal together), petroleum, coal, natural gas and water.
  • Emissions of CO2-equivalent greenhouse gases - primarily carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O).
  • Emissions of seven 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), black carbon (BC), and sulfur oxides (SOx).
September 3, 2010
Fuel Pathways

GREET includes more than 100 fuel pathways including petroleum fuels, natural gas fuels, biofuels, hydrogen and electricity produced from various energy feedstock sources

September 3, 2010
Vehicle Technologies

GREET simulates the following three vehicle classes: :

  • Passenger cars
  • Light Duty Truck 1 ( gross weight < 6000 lb)
  • Light Duty Truck 2 ( gross weight < 8500 lb)

GREET includes more than 80 vehicle/fuel systems covering the following vehicle technologies:

  • Conventional spark-ignition engine vehicles
  • Spark-Ignition, Direct-Injection Engine Vehicles
  • Compression-Ignition, Direct-Injection Engine Vehicles
  • Hybrid electric vehicles
    • Spark-ignition engines
    • Compression-ignition engines
  • Plug-in hybrid electric vehicles
    • Spark-ignition engines
    • Compression-ignition engines
  • Battery-powered electric vehicles
  • Fuel-cell vehicles