IEC 60050-692:2017 gives the terminology used when considering the dependability and quality of service of electric power systems. The concepts are categorized according to the following sections:- system concepts;- operating states of electric power systems;- failures in electric power systems;- outages of electric power systems equipment;- outage occurrences in electric power systems;- state durations and availability related concepts;- interruptions in electric power systems;- selected customer interruption measures;- bulk electric power system load/energy curtailments;- bulk electric system failures and measures;- supply performance measures.IEC 60050-692:2017 has the status of a horizontal standard in accordance with IEC Guide 108:2006. This terminology is consistent with the terminology developed in the other specialized parts of the IEV.