We are pleased to announce that GREET (Beta) in a new platform is available for free download.

Argonne National Laboratory’s life cycle analysis team, sponsored by the Office of Energy Efficiency and Renewable Energy, has developed GREET in a new user friendly platform for evaluating the emissions and usage of primary resources associated with transportation fuels production and use. This new integrated design is based on the GREET database layered with algorithms and a graphical interface, thus making it a powerful and flexible tool. The new intuitive graphical interface allows the user to create new pathways from the available database using simple drag and drop operations.

This new software is now available for download. For more information and to download the software, check out the new GREET platform page

For more details on GREET(Beta), please download and read the following documents:

• Mathematical Model Guide (902 kB pdf)
• User Guide (2.4MB pdf)

The GREET team at Argonne National Laboratory is pleased to announce a new release of the GREET fuel cycle model (GREET1_2012, rev. 2) . This release includes the following updates:

• Added hydrothermal liquefaction of algae
• Added wastewater sludge-based renewable natural gas
• Updated sugarcane ethanol pathways
• Replaced farmed trees farming with willow and popular farming
• Updated electricity generation mixes, shale gas shares and oil sand shares
• Added navigation menus to enhance the user experience
• Added energy functional units to the "Results" worksheet
• Adjusted lipid and moisture contents of oil seeds and their impact on oil and co-product yields

For more details on updates in GREET 1 2012 rev2, please download and read the following document:

• Summary of Revisions of the GREET 1 2012 rev2 (199 kB pdf)

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

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).

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

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