GACMO Tool

Gacmo tool latest updates

A new version of the GACMO tool (version 2.3) is now available as of October 2025. This version maintains the same methodological approach as previous releases. Key updates in version 2.3 include:
A brief explanation of the approach to be used for defining units of mitigation options in the “Mitigation Options” sheet:
Units of penetration for mitigation options in the column I should be defined relative to the start year, excluding those implemented before and during the start year, and including those implemented in the years following the start year (if those options are still operational). For example, the units of penetration of mitigation options in 2030 should include mitigation measures that were not only launched in 2030, but also those implemented earlier (such as in 2025) and still operational in 2030. Users should carefully consider the lifetime of each mitigation measure when specifying units of penetration in future years.
A revised approach for tracking progress in the “Tracking Progress” sheet:
 

• Achieved emission reductions from mitigation measures can be calculated annually from 2021 to 2035.
• Percentage achievement of progress is calculated for milestone years: 2025, 2030, and 2035.
• The unit penetration of implemented mitigation options now aligns with that of planned options: units for mitigation options in both the Tracking Progress and Mitigation Options sheets should be defined relative to the start year—excluding those implemented before or during the start year, and including those implemented in subsequent years (e.g., mitigation options for 2030 should include those implemented in 2025 and still operational in 2030).