On October 23, 2007, the NERC Board of Trustees (Board) approved the collection of the Phase I TADS data, beginning in calendar year 2008. On October 29, 2008, the Board approved the collection of Phase II TADS Non-Automatic Outage Data, beginning in 2010. TAD collects transmission outage data in a common format for:
Bulk Electric System AC Circuits (Overhead and Underground)
Transmission Transformers (No Generator Step-up Units)
Bulk Electric System AC/DC Back-to-Back Converters