Transmission Availability Data System User Group (TADSUG)

​​​​​​The purpose of the Transmission Availability Data System User Group (TADSUG) is to implement a uniform approach to reporting and measuring transmission availability, performance and other related reliability data. To meet this purpose, the TADSUG makes recommendations on four key subjects: 1. The type of transmission availability data that Transmission Owners (TOs) report to NERC; 2. A single process for collecting such data that avoids duplication of effort; 3. Transmission availability and performance metrics that are calculated from the reported data; and 4. Guidelines for release of data and metrics.

Subscribe to the TADSUG Distribution List

If you would like to be added to the TADSUG Meeting Distribution List, you must first register an account in the ERO Portal.

Once you have registered your ERO Portal account, authenticated your credentials with DUO, and completed your profile, please send an email to with “Please add me to the TADSUG Meeting Distribution List" in the subject line

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