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The Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation Model

August 28, 2014
GREET User Workshop

The Argonne GREET team is pleased to announce a two-day GREET user workshop on October 15-16, 2015, at Argonne National Laboratory to help familiarize GREET users with new developments and updates of the GREET 2015 suite of models.

Registration is free but the number of available seats is limited. In order to participate, please register using the form at this link: GREET User Workshop 2015

October 2, 2015
GREET™ 2015 Release

The Argonne National Laboratory’s Systems Assessment Group is pleased to announce the 2015 release of the suite of GREETTM models and associated reports. This release includes the following expansions and updates:

I. Major Expansions and Updates:

  • Water consumption of fuel production pathways: developed and updated water consumption for hydrogen from various sources, petroleum fuels, biofuels, and hydro-electric power.
  • Shale oil: developed energy and GHG emissions intensities of U.S. shale oil production with operation data from Bakken and Eagle Ford plays.
  • Oil sands: updated GHG emission intensities for Canadian oil sands pathways for surface mining and in-situ technologies.
  • High-octane fuels: developed high-octane fuel (HOF, with research octane number of 100) pathways with E10, E25, and E40 ethanol blends.
  • Bioethanol: introduced land-management practices of cover crops and manure applications for corn-soy systems for soil organic carbon simulations.
  • Waste to energy: expanded and updated waste-to-energy pathways to include renewable natural gas and hydrothermal liquefaction fuels from wastewater treatment plant biosolids and municipal solid waste.
  • Aluminum for vehicle production: updated the life-cycle inventory for aluminum.
  • Other metals for vehicle production and catalyst production (the latter is for fuel conversion processes): added or updated several metals, including molybdenum, platinum, zinc, nickel and silicon, glass and glass fiber, and Chilean copper.

II. Other Updates:

  • Natural gas: updated methane leakage emissions for natural gas pathways.
  • Electricity generation mix: updated electricity generation mix based on EIA AEO 2015.
  • Boiler emission factors: updated stationary combustion emission factors for coal and biomass boilers for industrial applications.
  • Bioproducts: updated and expanded the bioproduct module of GREET to include L-lactic acid and ethyl lactate.
  • Catalyst for thermochemical biofuels production: developed the energy and material flows for the production of gamma aluminum-based catalysts, including spent catalyst treatment and recovery.
  • Soybeans based fuels: updated N2O emissions in soybean fields.
  • Vehicle fuel economy and emissions: updated fuel economies and emission factors for both light-duty vehicles (LDVs) and heavy duty vehicles (HDVs).
  • Li-ion batteries: expanded and updated material data for Li-ion battery anodes, including graphite and metallic lithium
  • Lightweight pickup trucks: updated the material composition of baseline and lightweight pickup trucks.
  • Vehicle powertrain material composition: updated the powertrain material composition of several different types of passenger vehicle technologies, including plug-in and fuel cell vehicles, as well as those of spark ignition and compression ignition engine vehicles.

For more information on these updates, please use the following link: (242kB pdf)

Oct 2, 2015
GREET 2015 Downloads (fuel and vehicle cycles):

  • To download and the latest 2015 database please use the following link
For more details on updates in 2015, please download the following document: (242kB pdf)

GREET Fuel Cycle (GREET 1):

  • To download GREET_1_2015 and the latest 2015 database please use the following link GREET 1 Series
For more details on updates in GREET1 2015, please download the following document: (231kB pdf)

GREET Vehicle Cycle (GREET 2):

  • To download GREET_2_2015 and the latest 2015 database please use the following link GREET 2 Series
For more details on updates in GREET2 2015, please download the following document: (246kB pdf)

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 2015 version for fuel-cycle analysis and GREET2 2015 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

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