The GREET team at the Systems Assessment Center of Argonne National Laboratory is pleased to announce the R&D GREET Marine Module 2023.

The Systems Assessment Center at Argonne National Laboratory has developed an interactive standalone marine module (R&D GREET Marine Module) to have a consistent platform for life cycle analysis of marine fuels. It is intended to evaluate the environmental impact of various marine fuel production pathways including both fossil- and bio-derived marine fuels. For easy access, this module uses Microsoft Excel with Visual Basic for Applications (VBA) to enable an interactive user interface.

In this release, we have added the background datasets for marine fuels with the most up-to-date R&D GREET 2023 Excel module. We made the R&D GREET Marine Module dynamic. It interacts with the R&D GREET fuel cycle model by directly reading upstream life cycle energy uses and emissions for key inputs to various stages in various marine fuel production pathways. The dynamic version enables changing the default input parameters of the R&D GREET1 model to user defined inputs. The connection to the R&D GREET1 model is automatic and it works in the background to show the results in the interactive R&D GREET Marine Module Excel file.

For detailed instructions on how to use the module, please refer to the R&D GREET Marine Module Introduction.

The R&D GREET Marine Module is developed with Microsoft Office 365. For best performance, we highly recommend using Microsoft Office 365 to run the module.

To download and open R&D GREET Marine Module:

• Click to save R&D GREET Marine Module_2023.zip file to your hard drive
• When the download is completed, extract the zip file
• Double click "GREET Interactive Marine Module.xlsm," and choose to "Enable Macros," if prompted.
• You may need to unblock both spreadsheets by going to the properties and making these as trusted documents.