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A fresh design for GREET life cycle analysis tool

GREET® 2017 provides the user with an easy to use and fully graphical toolbox to perform life cycle analysis simulations of alternative transportation fuels and vehicle technologies in a matter of a few clicks. This new tool includes the data of the GREET model, a fast algorithm for processing it and an interactive user interface. The interface allows faster development using graphical representation of each element in the model, and drag & drop editing approach to add and modify data.

To users who have installed previous versions (e.g., 2016):

Although a previous version (e.g., 2016) may be able to load the latest data file in this release, it is highly recommended to upgrade the software to GREET 2017. To do that:

  • Uninstall all previous versions of through “Control Panel”→ “Programs and Features”
  • Delete (or move to other places if the following files contain your modifications) “default.greet” file, “Mapping” folder, and “Scenarios” folder under your “Greet\Data” folder, normally in C:\Users\[Your name]\Documents\Greet\Data
  • Download and install GREET 2017
  • If the old “default.greet” file you move to other places contains your modifications, it is possible to merge those changes to the new “default.greet” file. Please refer to “Data Merging” section of the “GREET-Manual.pdf” (Menu Bar→"About"→"User Manuals")
  • If you have questions, please refer to our Frequently Asked Questions and Answers or send an email to

    Graphical Pathway Representation