County annual report · FIPS 47187
2017 Williamson County, TN Power Outage Report
In 2017, customers in Williamson County, TN went without power for an average of 0.6 hours, a total of 68K customer-hours (Tennessee average 5.6 hours). That ranks 36th worst of 68 Tennessee counties and 2261st of 2,786 nationally.
Compared with TN, the US and 2016
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Williamson County, 2017
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 30, 2017 01:00 | June 30, 2017 03:15 | 2h 15m | 7,565 | 1,893 |
| 2 | March 1, 2017 13:00 | March 3, 2017 03:00 | 1d 14h | 5,958 | 14K |
| 3 | July 28, 2017 00:15 | July 28, 2017 02:30 | 2h 15m | 3,325 | 1,146 |
| 4 | May 16, 2017 09:15 | May 16, 2017 21:30 | 12h 15m | 2,884 | 785 |
| 5 | May 12, 2017 05:15 | May 12, 2017 19:45 | 14h 30m | 2,446 | 5,857 |
| 6 | April 19, 2017 13:30 | April 19, 2017 22:30 | 9h | 2,190 | 568 |
| 7 | December 23, 2017 04:45 | December 23, 2017 06:45 | 2h | 2,180 | 1,328 |
| 8 | December 20, 2017 09:00 | December 20, 2017 09:30 | 30m | 1,780 | 890 |
| 9 | November 24, 2017 13:30 | November 24, 2017 17:15 | 3h 45m | 1,391 | 401 |
| 10 | July 6, 2017 12:00 | July 6, 2017 19:30 | 7h 30m | 1,176 | 314 |
Outage episodes by size in 2017: 57 reached 100+ customers, 13 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 2017, 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 | 2017 | 3.7 hrs | 1.70 | 1.8 hrs | 1.36 |
| City of Dickson | 2017 | 3.1 hrs | 1.68 | 2.8 hrs | 1.58 |
| Nashville Electric Service | 2017 | 1.9 hrs | 1.54 | 1.8 hrs | 1.47 |
| Columbia Power System - (TN) | 2017 | 8.6 hrs | 1.51 | 7.6 hrs | 0.82 |
| 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 n/a of Tennessee's customers in 2017; 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, 2017, 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/2017/tennessee/williamson-county