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. This terminology is consistent with the terminology developed in the other specialized parts of the IEV. It has the status of a horizontal standard in accordance with IEC Guide 108.