How Reliable Is Your Tennessee Power Utility?

Chattanooga TN

26 February, 2021

4:47 PM

Description

CHATTANOOGA, TN — The monumental power failure in Texas caused by unseasonable cold showed how extreme weather can push an electric grid to the brink. The average U.S. power customer loses electricity for 1.5 to 2 hours annually even before extreme weather events are taken into account, according to data from the U.S. Energy Information Administration. As the Texas experience showed, hurricanes, snowstorms, heat waves and other extreme weather events can make such outages dramatically worse. Customers in Tennessee state experienced 4.46 hours without power in 2019 — 0.24 fewer hours than the national average of 4.7 hours in 2019, which is the most recent information available, according to the EIA. Nationally, 3.2 hours of downtime occurred during major events such as hurricanes and blizzards in 2019, and 1.5 hours occurred during non-major events. The average 2019 interruption time was shorter than 2018 and 2017, which saw total average outage times of nearly six hours and nearly eight hours respectively. Still, 2019's average total outage time was higher than 2013 through 2016, according to the EIA. The number of hours without power can vary widely from state to state, especially when many extreme weather events such as hurricanes, snowstorms and wildfires occur. North Carolina electric customers likely remember many hours in the dark during 2018 — the average customer in that state spent nearly 30 hours without power, much of that due to Hurricanes Michael and Florence. The states with the highest average total interruption time per customer in 2019 were Maine, West Virginia, California, Michigan and Mississippi, according to the EIA. Maine had severe winter storms and California had large wildfires. The states with the least amount of average downtime were Florida, Nevada, Arizona, Nebraska and Washington, D.C. The EIA collects outage data from electric utilities annually and asks for information with and without major outages. The two major metrics are: How often the average customer experiences a non-momentary power outage during a year, referred to as the system average interruption frequency index. How many minutes the average customer is without power annually, referred to as the system average interruption duration index. Most electric utilities use standards developed by the Institute of Electrical and Electronics Engineers to make their calculations. The IEEE uses a complex formula based on a utility's historical data to determine whether an outage qualifies as a major event. It also only counts outages longer than five minutes. Utilities are mostly owned by investors, cooperatives or municipalities. Investor-owned utility customers spent an average of 5.1 hours without power in 2019 while municipal customers spent an average of 2.1 hours and cooperative customers had about five hours without the lights. Here's how utilities in Tennessee did during 2019, according to data from the EIA. Editor's note: This list was automatically generated using data compiled by the U.S. Energy Information Administration. Please report any errors or other feedback to [email protected]. Can't find the utility provider you're looking for? Try searching for it here. City of Memphis - (TN) Owner type: Municipal Number of customers: 418,951 IEEE standard followed: Yes Average customer hours without power, including major events: 6.66 Average customer hours without power, excluding major events: 4.42 Number of outages for average customer, including major events: 1.96 Number of outages for average customer, excluding major events: 1.73 Nashville Electric Service Owner type: Municipal Number of customers: 396,307 IEEE standard followed: Yes Average customer hours without power, including major events: 4.98 Average customer hours without power, excluding major events: 2.09 Number of outages for average customer, including major events: 2.02 Number of outages for average customer, excluding major events: 1.63 Middle Tennessee E M C Owner type: Cooperative Number of customers: 232,838 IEEE standard followed: Yes Average customer hours without power, including major events: 1.5 Average customer hours without power, excluding major events: 1.5 Number of outages for average customer, including major events: 1.52 Number of outages for average customer, excluding major events: 1.52 Knoxville Utilities Board Owner type: Municipal Number of customers: 203,914 IEEE standard followed: Yes Average customer hours without power, including major events: 3.89 Average customer hours without power, excluding major events: 2.6 Number of outages for average customer, including major events: 2.04 Number of outages for average customer, excluding major events: 1.65 City of Chattanooga - (TN) Owner type: Municipal Number of customers: 185,137 IEEE standard followed: Yes Average customer hours without power, including major events: 1.86 Average customer hours without power, excluding major events: 1.27 Number of outages for average customer, including major events: 0.8 Number of outages for average customer, excluding major events: 0.62 Cumberland Elec Member Corp Owner type: Cooperative Number of customers: 100,540 IEEE standard followed: No Average customer hours without power, including major events: 7.24 Average customer hours without power, excluding major events: 2.94 Number of outages for average customer, including major events: 2.99 Number of outages for average customer, excluding major events: 2.23 Duck River Elec Member Corp Owner type: Cooperative Number of customers: 75,843 IEEE standard followed: Yes Average customer hours without power, including major events: 3 Average customer hours without power, excluding major events: 2.21 Number of outages for average customer, including major events: 2.01 Number of outages for average customer, excluding major events: 1.73 City of Murfreesboro Owner type: Municipal Number of customers: 65,965 IEEE standard followed: Yes Average customer hours without power, including major events: 0.61 Average customer hours without power, excluding major events: Not reported Number of outages for average customer, including major events: 0.68 Number of outages for average customer, excluding major events: Not reported Sevier County Electric System Owner type: Municipal Number of customers: 54,590 IEEE standard followed: Yes Average customer hours without power, including major events: 6.45 Average customer hours without power, excluding major events: 5.44 Number of outages for average customer, including major events: 3.3 Number of outages for average customer, excluding major events: 2.92 Upper Cumberland E M C Owner type: Cooperative Number of customers: 51,656 IEEE standard followed: Yes Average customer hours without power, including major events: 2.88 Average customer hours without power, excluding major events: 2.07 Number of outages for average customer, including major events: Not reported Number of outages for average customer, excluding major events: Not reported Southwest Tennessee E M C Owner type: Cooperative Number of customers: 50,888 IEEE standard followed: No Average customer hours without power, including major events: 3.31 Average customer hours without power, excluding major events: Not reported Number of outages for average customer, including major events: 2.06 Number of outages for average customer, excluding major events: Not reported Kingsport Power Co Owner type: Investor Number of customers: 48,317 IEEE standard followed: Yes Average customer hours without power, including major events: 4.71 Average customer hours without power, excluding major events: 4.37 Number of outages for average customer, including major events: 1.71 Number of outages for average customer, excluding major events: 1.65 Appalachian Electric Coop Owner type: Cooperative Number of customers: 47,252 IEEE standard followed: Yes Average customer hours without power, including major events: 6.04 Average customer hours without power, excluding major events: 4.67 Number of outages for average customer, including major events: 3.39 Number of outages for average customer, excluding major events: 3.23 Gibson Electric Members Corp Owner type: Cooperative Number of customers: 38,407 IEEE standard followed: Yes Average customer hours without power, including major events: 2.72 Average customer hours without power, excluding major events: 1.81 Number of outages for average customer, including major events: 1.97 Number of outages for average customer, excluding major events: 1.6 City of Greeneville - (TN) Owner type: Municipal Number of customers: 38,195 IEEE standard followed: Yes Average customer hours without power, including major events: 2.2 Average customer hours without power, excluding major events: 1.53 Number of outages for average customer, including major events: 2.22 Number of outages for average customer, excluding major events: 1.53 City of Dickson Owner type: Municipal Number of customers: 36,519 IEEE standard followed: Yes Average customer hours without power, including major events: 5.12 Average customer hours without power, excluding major events: 2.39 Number of outages for average customer, including major events: 3.77 Number of outages for average customer, excluding major events: 3.14 Sequachee Valley Electric Coop Owner type: Cooperative Number of customers: 36,083 IEEE standard followed: Yes Average customer hours without power, including major events: 5.81 Average customer hours without power, excluding major events: 3.87 Number of outages for average customer, including major events: 4.25 Number of outages for average customer, excluding major events: 3.57 City of Jackson - (TN) Owner type: Municipal Number of customers: 35,825 IEEE standard followed: Yes Average customer hours without power, including major events: 1.85 Average customer hours without power, excluding major events: Not reported Number of outages for average customer, including major events: 1.21 Number of outages for average customer, excluding major events: Not reported Meriwether Lewis Electric Coop Owner type: Cooperative Number of customers: 34,577 IEEE standard followed: No Average customer hours without power, including major events: 2.46 Average customer hours without power, excluding major events: 2.03 Number of outages for average customer, including major events: 2.37 Number of outages for average customer, excluding major events: 1.5 Click here to see the numbers for more Tennessee utility providers.