Transmission Availability Data System (TADS) reporting and data analysis

This paper describes the inception and basic structure of the North American Electric Reliability Corporation (NERC) Transmission Availability Data System (TADS) and ongoing activities carried out by the NERC TADS Working Group (WG). TADS data was first collected in 2008 after the NERC Board of Trustees approved the collection of TADS data. This paper presents an overview of basic concepts incorporated into the TADS collection system to uniformly and consistently quantify the reliability performance of the North American bulk transmission system. This paper discusses the categorization of transmission outage events including basic definitions of reliability indicators. Additionally, analysis results obtained from outage data collected in TADS during the period 2010-2014 are presented.