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


GREET News
Oct 3, 2014
GREET.net 2014

The latest major update was developed in order to be more robust and flexible. The major additions to the GREET 2014 version are:

  • Updated pathway structure to allow more complex and detailed pathways
  • Updated processes to allow multiple input and multiple outputs, each allocated output can be used downstream
  • Updated vehicle results to allow multiple functional units
  • Incorporated charting tool
  • Incorporated CCLUB with two new feedstocks (poplar and willow), new organic carbon emission factors for soil depth of 100 cm, and new land-use change results
  • Incorporated marine vessel module
  • Added water consumptions for the major pathways as an additional life-cycle analysis metric
  • Added black carbon and organic carbon emissions as an additional criteria air pollutants (CAP) and GHG species
  • Updated refining efficiency and greenhouse gas (GHG) emission intensity of petroleum products
  • Expanded oil sands modeling with more detailed and refined operation data
  • Updated methane emission for natural gas pathways as well as petroleum venting, fugitive and flaring emissions
  • Updated soybean and biodiesel production assumptions
  • Added pretreatment pathways including dilute acid pretreatment and ammonia fiber expansion
  • Added conventional and bio-product pathways
  • Added catalyst production pathways
  • Updated enzyme and yeast assumptions
  • Updated global warming potential (GWP)
  • Other updates are in progress and notification will be provided when these updates become available.

Download GREET.net from the GREET.net website

Oct 3, 2014
GREET 1 2014

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

  • Updated refining efficiency and greenhouse gas (GHG) emission intensity of petroleum products.
  • Expanded oil sands modeling with more detailed and refined operation data.
  • Added water consumptions for the major pathways as an additional life-cycle analysis metric.
  • Added black carbon and organic carbon emissions as an additional criteria air pollutants (CAP) and GHG species.
  • Added contribution of oil and gas infrastructure to greenhouse gas emissions for crude and natural gas production and processing.
  • Added rail module as an additional transportation application.
  • Added heavy duty vehicle (HDV) module as an additional transportation application.
  • Updated stationary combustion emission factors.
  • Added conventional and bio product pathways.
  • Added pretreatment pathways including dilute acid pretreatment and ammonia fiber expansion.
  • Added catalyst production pathways.
  • Added a corn ethanol production process with corn oil extraction and integrated corn/corn stover ethanol production processes.
  • Updated methane emission for natural gas pathways as well as petroleum venting, fugitive and flaring emissions.
  • Updated global warming potential (GWP) and added global temperature potential (GTP) based on IPCC 2013 AR5 report.
  • Updated soybean and biodiesel production assumptions.
  • Updated cellulosic ethanol production assumptions based on SOT 2013.
  • Updated CCLUB with two new feedstocks (poplar and willow), new organic carbon emission factors for soil depth of 100 cm, and new land-use change results.
  • Added ethanol-to-jet pathways.
  • Updated enzyme and yeast assumptions.
  • Added Gas/Biomass-To-Liquid (GBTL) pathways and updated Gas-To-Liquid (GTL) pathways.
  • Added a summary of the 3-season results for the algae hydrothermal liquefaction pathway.
  • Updated the CO2 emission factor from limestone application.

For more details on updates in GREET 1 2014, please download and read the following document:

Oct 25, 2013
AFLEET Tool

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
page.

October 3, 2014
GREET 2 2014

  • Added six new vehicles for both baseline and lightweigting models, with different material compositions.
  • Updated carbon fiber and Magnesium production assumptions.
  • Added additional cathode materials and composition data for Li-ion batteries.

For more details on updates in GREET 2 2014, please download and read the following document:


How Does GREET Work?
October 3, 2014
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 2014 version for fuel-cycle analysis and GREET 2 2014 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

Fuel
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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