A workshop will be held at Argonne National Laboratory on September 21st to provide training and collect feedback from our users concerning the GREET new platform.

The purpose of this event is to give people the opportunity to test this new software which is in beta version right now. Trainings will be offered for modeling new pathways using a graphical user interface that does not depends on Excel. We'll expect to get a lot of feedback from this event in order to improve the stability and enhance features of the software.

For more details on the software and the workshop please see the new platform page

This revision of GREET 1 2012 rev1 model includes the following updates:

• Parameters for field burning of sugarcane straw and sugarcane ethanol production are updated
• Alberta mix is defined and used for bitumen recovery and upgrading in oil sand operation
• The yeast dosage for cellulosic ethanol production is corrected from 24g/kg_biomass to 2.49g/kg_biomass

For more details on updates in GREET 1 2012 rev1, please download and read the following document:

• Summary of Revisions of the GREET 1 2012 rev1 (279 kB pdf)

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