This increase was largely a result of higher numbers of hurricanes, wildfires, and severe storms that year.ĮIA collects data on the frequency and duration of power outages for three main types of electric distribution utilities: investor-owned utilities (IOU), which are owned by shareholders cooperative energy utilities (co-ops), which are owned by members of the cooperative and public utilities, which are owned by government entities such as municipalities, regional authorities, and states. In 2017, the average electricity outage duration with major events was twice as long as in previous years. In 20, however, customers experienced longer outages, driven by increases in interruptions with major events. electricity customers have consistently experienced average total power interruptions of about two hours (106 minutes to 118 minutes) per year when major events are excluded. Since EIA began collecting reliability data in 2013, U.S. Energy Information Administration (EIA) produced an informational video on electricity reliability metrics. Utilities can report interruption duration values with major events (such as snowstorms, hurricanes, floods, or heatwaves) without major events (or after removing the effects of major events), or both. In that sense, not all outages result in interruption of service to customers, depending on how the system is configured. Although the terms outage and interruption are often used interchangeably, IEEE defines an outage as a component's inability to deliver power and an interruption as the result of one or more of those equipment outages. For utilities that report SAIDI metrics using Institute of Electrical and Electronics Engineers (IEEE) standards, non-momentary interruptions are those lasting longer than five minutes. One way to measure the reliability of electric utilities is the System Average Interruption Duration Index (SAIDI) metric, which is the total time an average customer experiences a non-momentary power interruption during a year. electricity customers averaged 5.8 hours per customer. Power interruptions are caused by many factors, including weather, vegetation patterns, and utility practices. Interruptions in electricity service vary in frequency and duration across the nearly 3,000 electric distribution systems in the United States. Energy Information Administration, Form EIA-861, Annual Electric Power Industry Report
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