County annual report · FIPS 47065
2025 Hamilton County, TN Power Outage Report
In 2025, customers in Hamilton County, TN went without power for an average of 4.9 hours, a total of 920K customer-hours (Tennessee average 4.3 hours). That ranks 32nd worst of 81 Tennessee counties and 1521st 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 Hamilton 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 | June 12, 2025 10:30 | June 13, 2025 05:15 | 18h 45m | 114,753 | 62K |
| 2 | June 13, 2025 07:00 | June 19, 2025 07:30 | 6d | 26,004 | 39K |
| 3 | December 21, 2025 13:15 | December 21, 2025 15:15 | 2h | 13,742 | 3,459 |
| 4 | June 7, 2025 17:45 | June 10, 2025 09:15 | 2d 15h | 10,104 | 175K |
| 5 | March 14, 2025 12:30 | March 17, 2025 07:00 | 2d 18h | 5,759 | 32K |
| 6 | June 23, 2025 07:45 | June 24, 2025 10:00 | 1d 2h | 5,238 | 3,838 |
| 7 | March 4, 2025 12:15 | March 7, 2025 08:00 | 2d 19h | 5,044 | 49K |
| 8 | May 5, 2025 12:15 | May 6, 2025 04:30 | 16h 15m | 4,869 | 62K |
| 9 | July 20, 2025 18:00 | July 23, 2025 10:30 | 2d 16h | 4,431 | 13K |
| 10 | May 1, 2025 23:15 | May 5, 2025 06:00 | 3d 6h | 4,097 | 48K |
Outage episodes by size in 2025: 185 reached 100+ customers, 43 reached 1,000+ customers, 4 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 Hamilton 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 |
|---|---|---|---|---|---|
| Volunteer Electric Coop | 2024 | 11.4 hrs | 5.80 | 7.3 hrs | 5.02 |
| City of Chattanooga - (TN) | 2021 | 73 min | 0.60 | 59 min | 0.53 |
| Sequachee Valley Electric Coop | 2024 | 5.0 hrs | 3.09 | 4.2 hrs | 2.69 |
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 ÷ 187,870 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. Hamilton County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Hamilton 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/hamilton-county