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2 <br />I. About this Report <br />This report focuses on distribution system reliability across the country and is customized <br />to each utility that participates in the American Public Power Association’s eReliability <br />Tracker service. APPA created the eReliability Tracker Annual Report to assist utilities in <br />their efforts to understand and analyze their electric system. In 2012, APPA developed the <br />eReliability Tracker thanks to a grant from the Demonstration of Energy & Efficiency <br />Developments (DEED) program. <br />This report reflects data in the eReliability Tracker from January 1, 2020 to December 31, <br />2020. If you do not have a full year of data in the system, then this analysis might not <br />properly reflect your utility's statistics. The report only includes data recorded as of <br />February 7, 2021. Reliability reflects both historic and ongoing engineering investment <br />decisions within a utility. Proper use of reliability metrics ensures that a utility is <br />performing its intended function and is providing service in a consistent and effective <br />manner. <br />While the primary use of reliability statistics is for self-evaluation, you can use these <br />statistics to compare your utility with similar utilities. However, differences such as <br />electrical network configuration, ambient environment, weather conditions, and number <br />of customers served typically limit most utility-to-utility comparisons. Due to the diverse <br />range of utilities that use the eReliability Tracker, this report endeavors to improve <br />comparative analyses by grouping utilities by size and region. <br />Since this report contains data for all utilities that use the eReliability Tracker, it is <br />important to consider how a particularly large or small utility can affect the rest of the <br />data. To ease the issues associated with comparability, each utility’s reliability statistics <br />are weighted based on customer count when aggregated. This means that all utilities are <br />equally weighted and all individual statistics are developed on a per customer basis. <br />The aggregate statistics displayed in this report are calculated from 271 utilities that <br />verified their 2020 outage data. Utilities that experienced no outages in 2020, or did not <br />upload any data, will have NULL, nan, or "0" values in their report for utility-specific data <br />and were not included in the aggregate analysis. Also note that log-normal data with a z- <br />score greater than 3.25 will be considered for inclusion and may be excluded if it <br />significantly distorts the aggregate statisitics. <br />250