County annual report · FIPS 47165
2023 Sumner County, TN Power Outage Report
In 2023, customers in Sumner County, TN went without power for an average of 17.7 hours, a total of 1.5M customer-hours (Tennessee average 11.1 hours). That ranks 10th worst of 83 Tennessee counties and 481st of 2,977 nationally.
Compared with TN, the US and 2022
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Sumner County, 2023
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 9, 2023 23:00 | December 21, 2023 22:15 | 11d 23h | 35,732 | 817K |
| 2 | March 3, 2023 13:30 | March 10, 2023 04:15 | 6d 14h | 24,019 | 428K |
| 3 | July 20, 2023 10:15 | July 22, 2023 04:30 | 1d 18h | 7,288 | 46K |
| 4 | March 10, 2023 18:00 | March 10, 2023 20:30 | 2h 30m | 5,912 | 1,491 |
| 5 | May 20, 2023 12:00 | May 20, 2023 20:00 | 8h | 4,782 | 4,353 |
| 6 | May 16, 2023 13:15 | May 17, 2023 00:00 | 10h 45m | 3,717 | 1,939 |
| 7 | September 26, 2023 12:30 | September 27, 2023 04:30 | 16h | 3,580 | 1,032 |
| 8 | July 29, 2023 20:15 | July 30, 2023 22:15 | 1d 2h | 3,489 | 5,669 |
| 9 | May 7, 2023 05:15 | May 7, 2023 10:00 | 4h 45m | 3,478 | 1,859 |
| 10 | June 30, 2023 19:45 | July 4, 2023 13:15 | 3d 17h | 3,455 | 25K |
Outage episodes by size in 2023: 107 reached 100+ customers, 42 reached 1,000+ customers, 2 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 2023, 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) | 2023 | 12.4 hrs | 4.01 | 5.7 hrs | 3.21 |
| Nashville Electric Service | 2023 | 21.9 hrs | 3.03 | 2.4 hrs | 1.74 |
| City of Gallatin - (TN) | 2023 | 2.7 hrs | 0.91 | 28 min | 0.50 |
| Cumberland Elec Member Corp | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Tennessee's customers in 2023; 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, 2023, 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/2023/tennessee/sumner-county