County annual report · FIPS 47065
2021 Hamilton County, TN Power Outage Report
In 2021, customers in Hamilton County, TN went without power for an average of 0.2 hours, a total of 35K customer-hours (Tennessee average 3.7 hours). That ranks 77th worst of 84 Tennessee counties and 2892nd 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 Hamilton 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 | May 26, 2021 14:00 | May 26, 2021 14:15 | 15m | 3,859 | 965 |
| 2 | April 8, 2021 06:15 | April 8, 2021 14:15 | 8h | 1,572 | 1,227 |
| 3 | January 12, 2021 18:45 | January 12, 2021 19:00 | 15m | 1,557 | 389 |
| 4 | September 3, 2021 13:00 | September 3, 2021 14:15 | 1h 15m | 1,544 | 402 |
| 5 | August 10, 2021 20:15 | August 10, 2021 22:15 | 2h | 1,529 | 389 |
| 6 | May 27, 2021 11:30 | May 27, 2021 13:00 | 1h 30m | 1,484 | 385 |
| 7 | June 21, 2021 17:45 | June 22, 2021 15:30 | 21h 45m | 1,368 | 1,295 |
| 8 | August 31, 2021 12:15 | September 1, 2021 06:30 | 18h 15m | 1,001 | 1,207 |
| 9 | July 14, 2021 02:15 | July 14, 2021 05:00 | 2h 45m | 991 | 1,085 |
| 10 | June 13, 2021 00:15 | June 13, 2021 21:00 | 20h 45m | 978 | 3,774 |
Outage episodes by size in 2021: 43 reached 100+ customers, 8 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 Hamilton 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 |
|---|---|---|---|---|---|
| Volunteer Electric Coop | 2021 | 8.6 hrs | 5.13 | 5.3 hrs | 4.64 |
| City of Chattanooga - (TN) | 2021 | 73 min | 0.60 | 59 min | 0.53 |
| Sequachee Valley Electric Coop | 2021 | 5.8 hrs | 3.71 | 4.5 hrs | 3.34 |
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 ÷ 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, 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/hamilton-county