County annual report · FIPS 47187
2019 Williamson County, TN Power Outage Report
In 2019, customers in Williamson County, TN went without power for an average of 1.3 hours, a total of 166K customer-hours (Tennessee average 2.7 hours). That ranks 49th worst of 86 Tennessee counties and 2355th of 2,945 nationally.
Compared with TN, the US and 2018
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Williamson County, 2019
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 21, 2019 11:45 | May 22, 2019 03:00 | 15h 15m | 7,721 | 3,909 |
| 2 | June 19, 2019 21:15 | June 23, 2019 02:15 | 3d 5h | 5,282 | 48K |
| 3 | July 21, 2019 01:30 | July 22, 2019 08:30 | 1d 7h | 4,850 | 12K |
| 4 | December 5, 2019 11:00 | December 6, 2019 00:15 | 13h 15m | 3,858 | 2,078 |
| 5 | August 4, 2019 17:30 | August 5, 2019 06:45 | 13h 15m | 3,826 | 1,974 |
| 6 | July 4, 2019 17:45 | July 5, 2019 03:15 | 9h 30m | 3,793 | 2,181 |
| 7 | February 9, 2019 08:00 | February 9, 2019 09:45 | 1h 45m | 3,647 | 1,825 |
| 8 | February 9, 2019 10:45 | February 9, 2019 20:00 | 9h 15m | 3,643 | 7,437 |
| 9 | May 4, 2019 10:30 | May 4, 2019 16:15 | 5h 45m | 3,083 | 4,670 |
| 10 | May 9, 2019 05:00 | May 9, 2019 05:30 | 30m | 3,082 | 771 |
Outage episodes by size in 2019: 73 reached 100+ customers, 28 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 Williamson County reported on EIA Form 861 for 2019, 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 |
|---|---|---|---|---|---|
| Duck River Elec Member Corp | 2018 | 2.9 hrs | 1.62 | 1.5 hrs | 1.29 |
| City of Dickson | 2018 | 2.5 hrs | 1.59 | 2.5 hrs | 1.59 |
| Nashville Electric Service | 2018 | 1.8 hrs | 1.56 | 1.8 hrs | 1.56 |
| Columbia Power System - (TN) | 2018 | 1.9 hrs | 1.81 | 61 min | 1.17 |
| Middle Tennessee E M C | - | - | - | - | - |
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 2019; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 123,583 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. Williamson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Williamson County, TN annual power outage report, 2019, 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/2019/tennessee/williamson-county