This is Argonne National Laboratory’s R&D version of GREET.
For GREET versions used for determining tax credits, please click here.
A brief introduction to R&D GREET can be found here.

R&D GREET Model – Frequently Asked Questions (FAQ)


This FAQ webpage provides an overview of a comprehensive FAQ document developed to address common questions related to the R&D GREET model, including model access, updates, capabilities, assumptions, limitations, and troubleshooting. The FAQ document is intended to support transparent, consistent, and informed use of the model by researchers, analysts, policymakers, and other stakeholders.

About the R&D GREET FAQ Document
The R&D GREET FAQ document compiles answers to frequently asked questions received by the GREET team and covers a wide range of topics, including:

  • Accessing and updating the R&D GREET model
  • Model capabilities, outputs, and configurable inputs
  • Compatibility and software requirements
  • Common user errors and troubleshooting guidance
  • Methodological topics such as carbon accounting and stochastic analysis
  • Definitions of key GREET terminology and life-cycle stages

The document is designed to complement the model documentation and user manuals, and to support consistent and transparent use of R&D GREET in research and analysis.

Click here to download the R&D GREET FAQ document (194KB pdf)

Questions Covered in the FAQ Document
The FAQ document addresses the following questions related to the R&D GREET model. This list is provided to help users quickly determine whether their question is covered before reviewing the full document.

    R&D GREET Updates
  • How do I obtain the R&D GREET model?
  • How often is the R&D GREET model updated?
  • Can I download older versions of the R&D GREET model?
  • Where can I get information about CA-GREET, 45VH2-GREET, 45ZCF-GREET, 40BSAF-GREET, or adapted versions of the GREET model?
  • How do you cite the R&D GREET model?
    • Frequent Requests
  • Where can I learn more about the R&D GREET model?
  • Where can I find an R&D GREET manual?
  • Where can I find information about future R&D GREET workshops?
  • Where can I find information about future R&D GREET trainings?
  • Where can I find information about R&D GREET tutorials?
  • Can you share the model code?
  • Where do I find supporting documents for specific pathways?
    • Compatibility
  • What version of Excel is the R&D GREET Excel model compatible with?
    • R&D GREET Capabilities
  • What does the R&D GREET model do?
  • What are R&D GREET outputs?
  • What can be changed in R&D GREET?
    • Common Errors
  • #Name Error/ Circular Calculations Error
  • Macros Error
    • Specific Questions
  • Why are there differences between the results in a journal article and the relevant pathway?
  • How do you use the Stochastic Simulation tool?
  • How can I include my own forecasts into the stochastic analysis?
  • How do I change the fuel economy of vehicles in R&D GREET?
  • How does R&D GREET model carbon accounting?