County annual report · FIPS 47165
2021 Sumner County, TN Power Outage Report
In 2021, customers in Sumner County, TN went without power for an average of 3.6 hours, a total of 305K customer-hours (Tennessee average 3.7 hours). That ranks 36th worst of 84 Tennessee counties and 1662nd of 2,974 nationally.
Compared with TN, the US and 2020
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Sumner County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 11, 2021 07:15 | December 16, 2021 20:00 | 5d 12h | 9,785 | 144K |
| 2 | May 4, 2021 07:00 | May 5, 2021 10:30 | 1d 3h | 4,928 | 19K |
| 3 | May 6, 2021 13:15 | May 7, 2021 22:00 | 1d 8h | 4,428 | 10K |
| 4 | August 18, 2021 15:30 | August 19, 2021 08:45 | 17h 15m | 3,181 | 5,443 |
| 5 | July 28, 2021 21:15 | July 29, 2021 17:15 | 20h | 3,162 | 2,765 |
| 6 | July 11, 2021 10:45 | July 12, 2021 00:45 | 14h | 3,074 | 4,122 |
| 7 | October 18, 2021 03:15 | October 18, 2021 03:45 | 30m | 3,040 | 1,451 |
| 8 | April 3, 2021 20:00 | April 4, 2021 02:00 | 6h | 2,715 | 2,724 |
| 9 | August 1, 2021 00:15 | August 1, 2021 17:15 | 17h | 2,384 | 6,573 |
| 10 | March 9, 2021 06:00 | March 10, 2021 03:00 | 21h | 2,100 | 1,661 |
Outage episodes by size in 2021: 103 reached 100+ customers, 35 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Sumner County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Tri-County Elec Member Corp (TN) | 2021 | 4.2 hrs | 2.98 | 3.9 hrs | 2.89 |
| Nashville Electric Service | 2021 | 12.8 hrs | 1.82 | 1.7 hrs | 1.27 |
| Cumberland Elec Member Corp | - | - | - | - | - |
| City of Gallatin - (TN) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 73% of Tennessee's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 85,061 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Sumner County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sumner County, TN annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/tennessee/sumner-county