County annual report · FIPS 47057
2020 Grainger County, TN Power Outage Report
In 2020, customers in Grainger County, TN went without power for an average of 2.9 hours, a total of 36K customer-hours (Tennessee average 6.5 hours). That ranks 43rd worst of 84 Tennessee counties and 1924th of 3,019 nationally.
Compared with TN, the US and 2019
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Grainger County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 24, 2020 20:45 | July 25, 2020 04:30 | 7h 45m | 1,145 | 1,673 |
| 2 | September 29, 2020 12:15 | September 29, 2020 16:15 | 4h | 1,107 | 880 |
| 3 | August 4, 2020 16:45 | August 4, 2020 22:45 | 6h | 1,097 | 961 |
| 4 | December 24, 2020 19:30 | December 24, 2020 19:45 | 15m | 841 | 210 |
| 5 | April 29, 2020 22:00 | April 30, 2020 22:30 | 1d | 828 | 3,055 |
| 6 | February 6, 2020 20:15 | February 7, 2020 01:45 | 5h 30m | 684 | 1,475 |
| 7 | June 2, 2020 17:15 | June 2, 2020 19:30 | 2h 15m | 601 | 304 |
| 8 | October 16, 2020 05:15 | October 16, 2020 10:30 | 5h 15m | 465 | 373 |
| 9 | November 12, 2020 20:15 | November 12, 2020 22:30 | 2h 15m | 430 | 219 |
| 10 | September 16, 2020 20:45 | September 16, 2020 21:15 | 30m | 427 | 107 |
Outage episodes by size in 2020: 25 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 2020, 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 | 2018 | 2.8 hrs | 1.77 | 88 min | 1.44 |
| Knoxville Utilities Board | 2020 | 4.7 hrs | 2.11 | 2.1 hrs | 1.65 |
| Appalachian Electric Coop | 2020 | 4.9 hrs | 3.13 | 3.8 hrs | 2.84 |
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 2020; 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, 2020, 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/2020/tennessee/grainger-county