5.2a ERMUSR 04-11-2023 - Laserfiche WebLink

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1. About This Report This report focuses on distribution system reliability across the country and is customized to each utility that participates in the American Public Power Association's eReliability Tracker service. APPA created the eReliability Tracker Annual Report to assist utilities in their efforts to understand and analyze their electric system. In 2012, APPA developed the eReliability Tracker thanks to a grant from the Demonstration of Energy & Efficiency Developments (DEED) program. This report reflects data in the eReliability Tracker from January 1, 2022 to December 31, 2022. This analysis might not properly reflect your utility's statistics if you do not have a full year of data in the system. The report includes data recorded as of March 14, 2023. Reliability reflects both historic and ongoing engineering investment decisions within a utility. Proper use of reliability metrics ensures that a utility is performing its intended function and is providing service in a consistent and effective manner. While the primary use of reliability statistics is for self -evaluation, you can use these statistics to compare your utility with similar utilities. However, differences such as electrical network configuration, ambient environment, weather conditions, and number of customers served typically limit most utility -to -utility comparisons. Due to the diverse range of utilities that use the eReliability Tracker, this report endeavors to improve comparative analyses by grouping utilities by size and region. Since this report contains data for all utilities that use the eReliability Tracker, it is important to consider how a particularly large or small utility can affect comparative benchmarks. To ease the issues associated with comparability, each utility's reliability statistics are weighted based on customer count when aggregated. This means that all utilities are equally weighted, and all individual statistics are developed on a per customer basis. The aggregate statistics in this report are calculated from the 285 utilities with verified 2022 outage data. Utilities that experienced no outages in 2022, or did not upload any data, will have NULL, None, or "0" values in their report for utility -specific data and were not included in the aggregate analysis. Also note that log -normal data with a z- score"' greater than 3.25 may be excluded if it significantly distorts the aggregate statistics. 1. A z-score indicates how much a data point differs from the mean. For instance, a z-score of 3.25 indicates that the data point is three and one -quarter standard deviations from the mean. A z-score of 0 indicates that the data point is identical to the mean. , 2 Im