County annual report · FIPS 47057
2025 Grainger County, TN Power Outage Report
In 2025, customers in Grainger County, TN went without power for an average of 3.6 hours, a total of 45K customer-hours (Tennessee average 4.3 hours). That ranks 46th worst of 81 Tennessee counties and 1878th 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 Grainger 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 | May 17, 2025 06:15 | May 19, 2025 06:15 | 2d | 1,946 | 8,735 |
| 2 | December 19, 2025 04:45 | December 20, 2025 20:30 | 1d 15h | 1,443 | 9,980 |
| 3 | August 26, 2025 10:00 | August 26, 2025 11:30 | 1h 30m | 1,283 | 1,661 |
| 4 | September 9, 2025 14:00 | September 9, 2025 15:30 | 1h 30m | 943 | 1,064 |
| 5 | April 7, 2025 17:15 | April 7, 2025 20:00 | 2h 45m | 871 | 222 |
| 6 | June 25, 2025 12:30 | June 25, 2025 15:15 | 2h 45m | 869 | 438 |
| 7 | July 18, 2025 01:30 | July 18, 2025 05:15 | 3h 45m | 577 | 726 |
| 8 | November 18, 2025 04:30 | November 18, 2025 09:00 | 4h 30m | 573 | 373 |
| 9 | February 7, 2025 02:45 | February 7, 2025 10:30 | 7h 45m | 472 | 3,514 |
| 10 | January 31, 2025 15:15 | January 31, 2025 20:15 | 5h | 444 | 604 |
Outage episodes by size in 2025: 30 reached 100+ customers, 3 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 Grainger 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 |
|---|---|---|---|---|---|
| Powell Valley Electric Coop | 2024 | 8.4 hrs | 4.97 | 1.7 hrs | 3.38 |
| Knoxville Utilities Board | 2024 | 5.9 hrs | 1.86 | 3.2 hrs | 1.40 |
| Appalachian Electric Coop | 2024 | 15.5 hrs | 3.67 | 4.9 hrs | 2.86 |
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 ÷ 12,567 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. Grainger County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Grainger 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/grainger-county