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

Oct 30, 2013 2013

The latest major update was developed in order to be more robust and flexible. We also added a lot of new data into the models and offers lot more pathways. The major additions to the GREET 2013 version are:

  • Updated parameters according to 2013 studies
  • Bio-fuels from algae pathways
  • Jet-fuels from conventional and renewable feedstocks
  • Aviation module for Well to Wake studies
  • Renewable natural gas landfill gas
  • Database merging module
  • Stochastic module and uncertainty definitions for key parameters
  • GREET Application Program Interface (API) for developers
Oct 25, 2013
GREET 1 2013

The GREET team at Argonne National Laboratory is pleased to announce a new release of the GREET fuel cycle model (GREET1_2013). This release includes the following updates:

  • New marine fuel pathways and commercial vessel operations
  • New sorghum ethanol pathways
  • New Tallow pathway
  • Electric power sector technology shares, efficiencies and emission factors by technology and utility regions
  • CH4 emissions for natural gas pathways
  • Transmission and distribution (T&D) emission factors, energy intensity, mode shares and distances
  • Biofuels land use change (LUC) data and new modeling options
  • Cellulosic biomass feedstock updates (e.g., farming, T&D, dry matter losses)
  • Fertilizers and nutrients use for biofuels pathways
  • Petroleum refining efficiency
  • Light duty vehicles (LDV) tailpipe emission factors
  • Hydrogen production with latest DOE H2A models
  • Urban share of criteria air pollutants (CAP) emissions (petroleum, electricity, LDVs)

For more details on updates in GREET 1 2013, please download and read the following document:

  • Summary of Revisions of the GREET 1 2013 (199 kB 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

Dec 21, 2012
GREET 2 2012 rev1

This release of GREET vehicle cycle model,(GREET2_2012, rev. 1) includes minor bug fixes.

How Does GREET Work?
September 3, 2010
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 GREET 1 2012 version for fuel-cycle analysis and GREET 2.7 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 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).
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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