County annual report · FIPS 47165
2025 Sumner County, TN Power Outage Report
In 2025, customers in Sumner County, TN went without power for an average of 3.2 hours, a total of 275K customer-hours (Tennessee average 4.3 hours). That ranks 49th worst of 81 Tennessee counties and 1988th of 3,000 nationally.
Compared with TN, the US and 2024
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Sumner County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 5, 2025 22:15 | April 9, 2025 01:00 | 3d 2h | 9,303 | 87K |
| 2 | June 2, 2025 11:00 | June 3, 2025 01:15 | 14h 15m | 6,963 | 6,849 |
| 3 | June 20, 2025 22:00 | June 21, 2025 05:30 | 7h 30m | 6,106 | 1,538 |
| 4 | June 17, 2025 20:00 | June 20, 2025 06:30 | 2d 10h | 4,689 | 14K |
| 5 | June 14, 2025 22:45 | June 15, 2025 00:00 | 1h 15m | 4,529 | 3,612 |
| 6 | January 20, 2025 12:45 | January 20, 2025 17:45 | 5h | 4,192 | 1,870 |
| 7 | June 23, 2025 12:45 | June 24, 2025 02:15 | 13h 30m | 3,674 | 2,031 |
| 8 | November 15, 2025 21:15 | November 15, 2025 23:45 | 2h 30m | 3,654 | 4,568 |
| 9 | March 4, 2025 14:15 | March 6, 2025 04:00 | 1d 13h | 3,551 | 10K |
| 10 | July 7, 2025 00:45 | July 7, 2025 04:00 | 3h 15m | 3,356 | 1,956 |
Outage episodes by size in 2025: 112 reached 100+ customers, 36 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 2025, 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) | 2024 | 6.4 hrs | 3.96 | 4.0 hrs | 3.19 |
| Nashville Electric Service | 2024 | 0 min | 0.00 | 87 min | 1.01 |
| City of Gallatin - (TN) | 2024 | 2.7 hrs | 1.45 | 52 min | 0.82 |
| 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 2025; 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, 2025, 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/2025/tennessee/sumner-county